/* ========================================
   PianoPlanner - Apple Design System
   Inspired by Apple's Human Interface Guidelines
   Clean, minimal, elegant
   ======================================== */

/* ========================================
   DESIGN TOKENS - Apple Style
   ======================================== */

:root {
    /* --------------------------------
       COLORS - Apple's Color Palette
       -------------------------------- */
    
    /* Grayscale - Apple's signature soft grays */
    --apple-white: #ffffff;
    --apple-gray-50: #fbfbfd;
    --apple-gray-100: #f5f5f7;
    --apple-gray-200: #e8e8ed;
    --apple-gray-300: #d2d2d7;
    --apple-gray-400: #aeaeb2;
    --apple-gray-500: #8e8e93;
    --apple-gray-600: #636366;
    --apple-gray-700: #48484a;
    --apple-gray-800: #3a3a3c;
    --apple-gray-900: #1d1d1f;
    --apple-black: #000000;
    
    /* Primary Green - PianoPlanner brand */
    --apple-blue: #91BD62;
    --apple-blue-hover: #7DA854;
    --apple-blue-light: rgba(145, 189, 98, 0.1);
    --apple-blue-subtle: rgba(145, 189, 98, 0.05);
    
    /* System Colors */
    --apple-green: #34c759;
    --apple-green-light: rgba(52, 199, 89, 0.12);
    --apple-orange: #ff9500;
    --apple-orange-light: rgba(255, 149, 0, 0.12);
    --apple-red: #ff3b30;
    --apple-red-light: rgba(255, 59, 48, 0.12);
    --apple-purple: #af52de;
    --apple-purple-light: rgba(175, 82, 222, 0.12);
    --apple-teal: #5ac8fa;
    --apple-teal-light: rgba(90, 200, 250, 0.12);
    --apple-indigo: #7DA854;
    --apple-indigo-light: rgba(88, 86, 214, 0.12);
    --apple-pink: #ff2d55;
    --apple-pink-light: rgba(255, 45, 85, 0.12);
    
    /* --------------------------------
       TYPOGRAPHY - SF Pro Style
       -------------------------------- */
    --apple-font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Segoe UI', sans-serif;
    --apple-font-rounded: -apple-system, BlinkMacSystemFont, 'SF Pro Rounded', 'SF Pro Display', 'Helvetica Neue', sans-serif;
    
    /* Font Weights */
    --apple-weight-regular: 400;
    --apple-weight-medium: 500;
    --apple-weight-semibold: 600;
    --apple-weight-bold: 700;
    
    /* Font Sizes - Apple's Type Scale */
    --apple-text-xs: 11px;
    --apple-text-sm: 13px;
    --apple-text-base: 15px;
    --apple-text-md: 17px;
    --apple-text-lg: 20px;
    --apple-text-xl: 24px;
    --apple-text-2xl: 28px;
    --apple-text-3xl: 34px;
    --apple-text-4xl: 40px;
    
    /* Letter Spacing */
    --apple-tracking-tight: -0.022em;
    --apple-tracking-normal: -0.016em;
    --apple-tracking-wide: 0.02em;
    
    /* --------------------------------
       SPACING - Apple's 8pt Grid
       -------------------------------- */
    --apple-space-1: 4px;
    --apple-space-2: 8px;
    --apple-space-3: 12px;
    --apple-space-4: 16px;
    --apple-space-5: 20px;
    --apple-space-6: 24px;
    --apple-space-8: 32px;
    --apple-space-10: 40px;
    --apple-space-12: 48px;
    --apple-space-16: 64px;
    
    /* --------------------------------
       BORDER RADIUS - Apple's Rounded Corners
       -------------------------------- */
    --apple-radius-xs: 4px;
    --apple-radius-sm: 8px;
    --apple-radius-md: 12px;
    --apple-radius-lg: 16px;
    --apple-radius-xl: 20px;
    --apple-radius-2xl: 24px;
    --apple-radius-3xl: 32px;
    --apple-radius-full: 9999px;
    
    /* --------------------------------
       SHADOWS - Apple's Soft Shadows
       -------------------------------- */
    --apple-shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.04);
    --apple-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --apple-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --apple-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --apple-shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
    --apple-shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.16);
    
    /* Glow Effects */
    --apple-glow-blue: 0 0 0 4px rgba(145, 189, 98, 0.25);
    --apple-glow-green: 0 0 0 4px rgba(52, 199, 89, 0.25);
    --apple-glow-red: 0 0 0 4px rgba(255, 59, 48, 0.25);
    
    /* --------------------------------
       ANIMATIONS - Apple's Smooth Motion
       -------------------------------- */
    --apple-ease: cubic-bezier(0.25, 0.1, 0.25, 1);
    --apple-ease-in: cubic-bezier(0.42, 0, 1, 1);
    --apple-ease-out: cubic-bezier(0, 0, 0.58, 1);
    --apple-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --apple-ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    
    --apple-duration-fast: 0.15s;
    --apple-duration-normal: 0.25s;
    --apple-duration-slow: 0.4s;
    --apple-duration-slower: 0.6s;
    
    /* --------------------------------
       BLUR - Apple's Frosted Glass
       -------------------------------- */
    --apple-blur-sm: 8px;
    --apple-blur-md: 16px;
    --apple-blur-lg: 24px;
    --apple-blur-xl: 40px;
    
    /* --------------------------------
       Z-INDEX Scale
       -------------------------------- */
    --apple-z-dropdown: 100;
    --apple-z-sticky: 200;
    --apple-z-fixed: 300;
    --apple-z-modal-backdrop: 400;
    --apple-z-modal: 500;
    --apple-z-popover: 600;
    --apple-z-toast: 700;
}

/* ========================================
   BASE STYLES
   ======================================== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--apple-font);
    font-size: var(--apple-text-md);
    font-weight: var(--apple-weight-regular);
    line-height: 1.47059;
    letter-spacing: var(--apple-tracking-normal);
    color: var(--apple-gray-900);
    background: var(--apple-gray-100);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--apple-weight-semibold);
    letter-spacing: var(--apple-tracking-tight);
    line-height: 1.1;
    color: var(--apple-gray-900);
}

h1 {
    font-size: var(--apple-text-3xl);
    font-weight: var(--apple-weight-bold);
}

h2 {
    font-size: var(--apple-text-2xl);
}

h3 {
    font-size: var(--apple-text-xl);
}

h4 {
    font-size: var(--apple-text-lg);
}

h5 {
    font-size: var(--apple-text-md);
}

p {
    color: var(--apple-gray-600);
    line-height: 1.52941;
}

.text-large {
    font-size: var(--apple-text-lg);
    line-height: 1.4;
}

.text-small {
    font-size: var(--apple-text-sm);
}

.text-caption {
    font-size: var(--apple-text-xs);
    color: var(--apple-gray-500);
    letter-spacing: var(--apple-tracking-wide);
    text-transform: uppercase;
}

.text-muted {
    color: var(--apple-gray-500);
}

a {
    color: var(--apple-blue);
    text-decoration: none;
    transition: color var(--apple-duration-fast) var(--apple-ease);
}

a:hover {
    color: var(--apple-blue-hover);
}

/* ========================================
   NAVIGATION BAR - Apple Style
   Consistent across all pages
   ======================================== */

.nav,
.nav-bar,
.main-nav {
    position: sticky;
    top: 0;
    z-index: var(--apple-z-sticky);
    background: rgba(251, 251, 253, 0.8);
    backdrop-filter: saturate(180%) blur(var(--apple-blur-xl));
    -webkit-backdrop-filter: saturate(180%) blur(var(--apple-blur-xl));
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.08);
}

.nav-content,
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.nav-logo,
.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    color: #B8860B;
    text-decoration: none;
    transition: all 0.15s ease;
    min-width: 150px;
}

.nav-logo:hover,
.nav-brand:hover {
    color: #DAA520;
    opacity: 1;
}

.nav-logo .logo-piano,
.nav-logo .logo-icon {
    color: #B8860B;
}

/* Navigation Links */
.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--apple-gray-600);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 9999px;
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.nav-link:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--apple-gray-900);
}

.nav-link.active {
    background: var(--apple-blue);
    color: var(--apple-white);
}

.nav-link.active svg {
    color: var(--apple-white);
}

.nav-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: #DAA520; /* Gold color for nav icons */
}

/* User Section */
.nav-user,
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 150px;
    justify-content: flex-end;
}

.nav-user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--apple-gray-600);
}

.nav-user-picture {
    width: 32px;
    height: 32px;
    border-radius: var(--apple-radius-full);
    border: 2px solid var(--apple-gray-200);
    object-fit: cover;
    transition: border-color var(--apple-duration-fast) var(--apple-ease);
}

.nav-user-picture:hover {
    border-color: var(--apple-blue);
}

/* Navigation Buttons */
.nav .btn {
    padding: var(--apple-space-2) var(--apple-space-4);
    font-size: var(--apple-text-sm);
}

.nav .btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* ========================================
   BUTTONS - Apple Style
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--apple-space-2);
    padding: var(--apple-space-3) var(--apple-space-5);
    border-radius: var(--apple-radius-full);
    font-family: var(--apple-font);
    font-size: var(--apple-text-base);
    font-weight: var(--apple-weight-medium);
    letter-spacing: var(--apple-tracking-normal);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    -webkit-user-select: none;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--apple-blue);
    color: var(--apple-white);
}

.btn-primary:hover {
    background: var(--apple-blue-hover);
    color: var(--apple-white);
}

.btn-secondary {
    background: var(--apple-gray-200);
    color: var(--apple-gray-900);
}

.btn-secondary:hover {
    background: var(--apple-gray-300);
}

.btn-ghost {
    background: transparent;
    color: var(--apple-blue);
}

.btn-ghost:hover {
    background: var(--apple-blue-light);
}

.btn-danger {
    background: var(--apple-red);
    color: var(--apple-white);
}

.btn-danger:hover {
    background: #e63329;
}

.btn-success {
    background: var(--apple-green);
    color: var(--apple-white);
}

.btn-success:hover {
    background: #2db54f;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--apple-gray-300);
    color: var(--apple-gray-900);
}

.btn-outline:hover {
    background: var(--apple-gray-100);
    border-color: var(--apple-gray-400);
}

/* Button Sizes */
.btn-sm {
    padding: var(--apple-space-2) var(--apple-space-3);
    font-size: var(--apple-text-sm);
}

.btn-lg {
    padding: var(--apple-space-4) var(--apple-space-8);
    font-size: var(--apple-text-md);
}

/* btn-icon: icon-only variant. Use .btn-icon-only for fixed 40px circle.
   Pages can extend .btn-icon freely for text+icon combos. */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border-radius: var(--apple-radius-full);
    cursor: pointer;
}

.btn-icon-only {
    width: 40px;
    height: 40px;
}

.btn-icon-only.btn-sm {
    width: 32px;
    height: 32px;
}

.btn-icon-only.btn-lg {
    width: 48px;
    height: 48px;
}

/* ========================================
   CARDS - Apple Style
   ======================================== */

.card {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    padding: var(--apple-space-6);
    box-shadow: var(--apple-shadow-sm);
    transition: all var(--apple-duration-normal) var(--apple-ease);
    border: 0.5px solid transparent;
}

.card:hover {
    box-shadow: var(--apple-shadow-md);
}

.card-flat {
    box-shadow: none;
    border: 0.5px solid var(--apple-gray-200);
}

.card-flat:hover {
    box-shadow: none;
    border-color: var(--apple-gray-300);
}

.card-interactive {
    cursor: pointer;
}

.card-interactive:hover {
    transform: translateY(-2px);
    box-shadow: var(--apple-shadow-lg);
}

.card-interactive:active {
    transform: translateY(0);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--apple-space-5);
}

.card-title {
    font-size: var(--apple-text-lg);
    font-weight: var(--apple-weight-semibold);
}

.card-subtitle {
    font-size: var(--apple-text-sm);
    color: var(--apple-gray-500);
    margin-top: var(--apple-space-1);
}

.card-body {
    color: var(--apple-gray-600);
}

/* Settings Card - Apple Style */
.settings-card {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    border: 0.5px solid var(--apple-gray-200);
    margin-bottom: var(--apple-space-4);
    overflow: hidden;
    transition: border-color var(--apple-duration-fast) var(--apple-ease);
}

.settings-card:hover {
    border-color: var(--apple-gray-300);
}

.settings-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--apple-space-4) var(--apple-space-5);
    cursor: pointer;
    transition: background var(--apple-duration-fast) var(--apple-ease);
}

.settings-card-header:hover {
    background: var(--apple-gray-50);
}

.settings-card-title {
    display: flex;
    align-items: center;
    gap: var(--apple-space-3);
    font-weight: var(--apple-weight-semibold);
    font-size: var(--apple-text-base);
    color: var(--apple-gray-900);
}

.settings-card-title .card-icon {
    color: var(--apple-gray-500);
}

.settings-card-status {
    display: flex;
    align-items: center;
    gap: var(--apple-space-2);
    font-size: var(--apple-text-sm);
    color: var(--apple-gray-500);
}

.settings-card-body {
    display: none;
    padding: 0 var(--apple-space-5) var(--apple-space-5);
    border-top: 0.5px solid var(--apple-gray-100);
}

.settings-card.expanded .settings-card-body {
    display: block;
    padding-top: var(--apple-space-4);
}

.settings-card .chevron-icon {
    width: 20px;
    height: 20px;
    color: var(--apple-gray-400);
    transition: transform var(--apple-duration-fast) var(--apple-ease);
}

.settings-card.expanded .chevron-icon {
    transform: rotate(180deg);
}

/* Quick Action Buttons - Apple Style */
.quick-actions {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    padding: var(--apple-space-4) var(--apple-space-5);
    border: 0.5px solid var(--apple-gray-200);
}

.quick-actions h3 {
    font-size: var(--apple-text-xs);
    font-weight: var(--apple-weight-semibold);
    color: var(--apple-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--apple-space-3);
}

.quick-btn {
    display: flex;
    align-items: center;
    gap: var(--apple-space-3);
    width: 100%;
    padding: var(--apple-space-3) var(--apple-space-4);
    margin-bottom: var(--apple-space-2);
    background: var(--apple-gray-50);
    border: 0.5px solid var(--apple-gray-200);
    border-radius: var(--apple-radius-md);
    font-size: var(--apple-text-sm);
    font-weight: var(--apple-weight-medium);
    text-align: left;
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    color: var(--apple-gray-700);
    text-decoration: none;
}

.quick-btn:hover {
    background: var(--apple-white);
    border-color: var(--apple-blue);
    color: var(--apple-blue);
    box-shadow: var(--apple-shadow-sm);
}

.quick-btn:active {
    transform: scale(0.98);
}

.quick-btn:last-child {
    margin-bottom: 0;
}

.quick-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Mini Calendar Card - Apple Style */
.mini-calendar-card {
    background: var(--apple-white);
    border: 0.5px solid var(--apple-gray-200);
    border-radius: var(--apple-radius-xl);
    padding: var(--apple-space-4);
    display: flex;
    flex-direction: column;
    gap: var(--apple-space-3);
}

.mini-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--apple-space-2);
}

.mini-title {
    font-weight: var(--apple-weight-semibold);
    color: var(--apple-gray-900);
    font-size: var(--apple-text-sm);
}

.mini-nav {
    display: flex;
    gap: var(--apple-space-1);
}

.mini-nav button {
    border: 0.5px solid var(--apple-gray-200);
    background: var(--apple-gray-50);
    color: var(--apple-gray-600);
    border-radius: var(--apple-radius-sm);
    padding: var(--apple-space-1) var(--apple-space-2);
    cursor: pointer;
    font-size: var(--apple-text-xs);
    font-weight: var(--apple-weight-medium);
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.mini-nav button:hover {
    background: var(--apple-white);
    border-color: var(--apple-gray-300);
}

.mini-daynames {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--apple-space-1);
    font-size: var(--apple-text-xs);
    color: var(--apple-gray-500);
    text-align: center;
    font-weight: var(--apple-weight-medium);
}

.mini-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--apple-space-1);
}

.mini-day {
    border-radius: var(--apple-radius-md);
    padding: var(--apple-space-2) var(--apple-space-1);
    min-height: 44px;
    background: var(--apple-gray-50);
    border: 0.5px solid transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    font-size: var(--apple-text-xs);
    color: var(--apple-gray-800);
}

.mini-day:hover {
    background: var(--apple-white);
    border-color: var(--apple-gray-300);
}

.mini-day.today {
    background: var(--apple-blue);
    color: var(--apple-white);
}

.mini-day.today:hover {
    background: var(--apple-blue-hover);
}

.mini-day.selected {
    background: var(--apple-blue-light);
    border-color: var(--apple-blue);
    color: var(--apple-blue);
}

.mini-day.other-month {
    color: var(--apple-gray-400);
    background: transparent;
}

/* Settings Tabs - Apple Segmented Control */
.settings-tabs {
    display: flex;
    gap: 2px;
    background: var(--apple-gray-200);
    padding: 3px;
    border-radius: var(--apple-radius-lg);
    margin-bottom: var(--apple-space-6);
}

.settings-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--apple-space-2);
    padding: var(--apple-space-3) var(--apple-space-4);
    border: none;
    background: transparent;
    border-radius: var(--apple-radius-md);
    font-size: var(--apple-text-sm);
    font-weight: var(--apple-weight-medium);
    color: var(--apple-gray-600);
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.settings-tab:hover {
    color: var(--apple-gray-900);
}

.settings-tab.active {
    background: var(--apple-white);
    color: var(--apple-gray-900);
    box-shadow: var(--apple-shadow-sm);
}

.settings-tab .tab-icon {
    width: 16px;
    height: 16px;
}

.settings-tab .tab-status {
    width: 8px;
    height: 8px;
    border-radius: var(--apple-radius-full);
    background: var(--apple-gray-300);
}

.settings-tab .tab-status.active {
    background: var(--apple-green);
}

/* ========================================
   FORMS - Apple Style
   ======================================== */

.form-group {
    margin-bottom: var(--apple-space-5);
}

.form-label {
    display: block;
    font-size: var(--apple-text-sm);
    font-weight: var(--apple-weight-medium);
    color: var(--apple-gray-900);
    margin-bottom: var(--apple-space-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--apple-space-3) var(--apple-space-4);
    font-family: var(--apple-font);
    font-size: var(--apple-text-md);
    color: var(--apple-gray-900);
    background: var(--apple-white);
    border: 1px solid var(--apple-gray-300);
    border-radius: var(--apple-radius-md);
    transition: all var(--apple-duration-fast) var(--apple-ease);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--apple-blue);
    box-shadow: var(--apple-glow-blue);
}

.form-input::placeholder {
    color: var(--apple-gray-400);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.5;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238e8e93' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.form-hint {
    font-size: var(--apple-text-sm);
    color: var(--apple-gray-500);
    margin-top: var(--apple-space-2);
}

.form-error {
    font-size: var(--apple-text-sm);
    color: var(--apple-red);
    margin-top: var(--apple-space-2);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--apple-space-4);
}

/* Checkbox & Radio - Apple Style */
.form-checkbox,
.form-radio {
    display: flex;
    align-items: center;
    gap: var(--apple-space-3);
    cursor: pointer;
    font-size: var(--apple-text-md);
}

.form-checkbox input,
.form-radio input {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--apple-gray-300);
    border-radius: var(--apple-radius-xs);
    background: var(--apple-white);
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    flex-shrink: 0;
}

.form-radio input {
    border-radius: var(--apple-radius-full);
}

.form-checkbox input:checked,
.form-radio input:checked {
    background: var(--apple-blue);
    border-color: var(--apple-blue);
}

.form-checkbox input:checked::after {
    content: '';
    display: block;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin: 1px auto;
}

.form-radio input:checked::after {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background: var(--apple-white);
    border-radius: var(--apple-radius-full);
    margin: 4px auto;
}

/* Toggle Switch - Apple Style */
.toggle-switch {
    position: relative;
    width: 51px;
    height: 31px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--apple-gray-300);
    border-radius: var(--apple-radius-full);
    transition: all var(--apple-duration-normal) var(--apple-ease);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 27px;
    width: 27px;
    left: 2px;
    bottom: 2px;
    background: var(--apple-white);
    border-radius: var(--apple-radius-full);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    transition: all var(--apple-duration-normal) var(--apple-ease);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--apple-green);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

/* Piano Checkbox Container - Multi-select */
.piano-checkbox-container {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 200px;
    overflow-y: auto;
    padding: 4px 0;
}

.piano-checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--apple-gray-50, #fbfbfd);
    border: 1px solid var(--apple-gray-200, #e8e8ed);
    border-radius: var(--apple-radius-md, 10px);
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.piano-checkbox-item:hover {
    background: var(--apple-gray-100, #f5f5f7);
    border-color: var(--apple-gray-300, #d2d2d7);
}

.piano-checkbox-item.selected {
    background: var(--apple-blue-light, #e3f2fd);
    border-color: var(--apple-blue, #91BD62);
}

.piano-checkbox-item input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 2px solid var(--apple-gray-300);
    border-radius: 6px;
    background: var(--apple-white);
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    display: flex;
    align-items: center;
    justify-content: center;
}

.piano-checkbox-item input[type="checkbox"]:checked {
    background: var(--apple-blue, #91BD62);
    border-color: var(--apple-blue, #91BD62);
}

.piano-checkbox-item input[type="checkbox"]:checked::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.piano-checkbox-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.piano-checkbox-name {
    font-weight: 500;
    font-size: 14px;
    color: var(--apple-gray-900, #1d1d1f);
}

.piano-checkbox-details {
    font-size: 12px;
    color: var(--apple-gray-500, #86868b);
}

.piano-checkbox-duration {
    font-size: 11px;
    color: var(--apple-blue, #91BD62);
    font-weight: 500;
    padding: 2px 8px;
    background: var(--apple-blue-light, rgba(145, 189, 98, 0.1));
    border-radius: 10px;
    white-space: nowrap;
}

/* ========================================
   TABLES - Apple Style
   ======================================== */

.table-container {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    box-shadow: var(--apple-shadow-sm);
    overflow: hidden;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: var(--apple-space-4) var(--apple-space-5);
    text-align: left;
}

.table th {
    font-size: var(--apple-text-xs);
    font-weight: var(--apple-weight-semibold);
    color: var(--apple-gray-500);
    text-transform: uppercase;
    letter-spacing: var(--apple-tracking-wide);
    background: var(--apple-gray-50);
    border-bottom: 0.5px solid var(--apple-gray-200);
}

.table td {
    font-size: var(--apple-text-base);
    color: var(--apple-gray-900);
    border-bottom: 0.5px solid var(--apple-gray-100);
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr:hover td {
    background: var(--apple-gray-50);
}

/* ========================================
   BADGES - Apple Style
   ======================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--apple-space-1) var(--apple-space-3);
    font-size: var(--apple-text-xs);
    font-weight: var(--apple-weight-medium);
    border-radius: var(--apple-radius-full);
    background: var(--apple-gray-200);
    color: var(--apple-gray-600);
}

.badge-primary {
    background: var(--apple-blue-light);
    color: var(--apple-blue);
}

.badge-success {
    background: var(--apple-green-light);
    color: #1a7f37;
}

.badge-warning {
    background: var(--apple-orange-light);
    color: #b25000;
}

.badge-danger {
    background: var(--apple-red-light);
    color: #c9302c;
}

.badge-purple {
    background: var(--apple-purple-light);
    color: var(--apple-purple);
}

/* ========================================
   LISTS - Apple Style
   ======================================== */

.list {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    box-shadow: var(--apple-shadow-sm);
    overflow: hidden;
}

.list-item {
    display: flex;
    align-items: center;
    gap: var(--apple-space-4);
    padding: var(--apple-space-4) var(--apple-space-5);
    border-bottom: 0.5px solid var(--apple-gray-100);
    transition: background var(--apple-duration-fast) var(--apple-ease);
    cursor: pointer;
}

.list-item:last-child {
    border-bottom: none;
}

.list-item:hover {
    background: var(--apple-gray-50);
}

.list-item:active {
    background: var(--apple-gray-100);
}

.list-item-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--apple-radius-md);
    background: var(--apple-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.list-item-icon svg {
    width: 22px;
    height: 22px;
    color: var(--apple-gray-600);
}

.list-item-content {
    flex: 1;
    min-width: 0;
}

.list-item-title {
    font-size: var(--apple-text-md);
    font-weight: var(--apple-weight-medium);
    color: var(--apple-gray-900);
}

.list-item-subtitle {
    font-size: var(--apple-text-sm);
    color: var(--apple-gray-500);
    margin-top: 2px;
}

.list-item-meta {
    text-align: right;
    flex-shrink: 0;
}

.list-item-chevron {
    color: var(--apple-gray-400);
}

/* ========================================
   MODALS - Apple Style
   ======================================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(var(--apple-blur-sm));
    -webkit-backdrop-filter: blur(var(--apple-blur-sm));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--apple-z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--apple-duration-normal) var(--apple-ease);
    padding: var(--apple-space-5);
}

.modal-overlay.active,
.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--apple-white);
    border-radius: var(--apple-radius-2xl);
    width: 100%;
    max-width: 600px;
    max-height: calc(100vh - 40px);
    overflow: hidden;
    transform: scale(0.95) translateY(20px);
    transition: transform var(--apple-duration-slow) var(--apple-ease-spring);
    box-shadow: var(--apple-shadow-2xl);
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal,
.modal-overlay.show .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--apple-space-5) var(--apple-space-6);
    border-bottom: 0.5px solid var(--apple-gray-200);
    flex-shrink: 0;
}

.modal-title {
    font-size: var(--apple-text-lg);
    font-weight: var(--apple-weight-semibold);
}

.modal-close {
    width: 30px;
    height: 30px;
    border-radius: var(--apple-radius-full);
    border: none;
    background: var(--apple-gray-200);
    color: var(--apple-gray-600);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.modal-close:hover {
    background: var(--apple-gray-300);
}

.modal-body {
    padding: var(--apple-space-6);
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--apple-space-3);
    padding: var(--apple-space-4) var(--apple-space-6);
    border-top: 0.5px solid var(--apple-gray-200);
    background: var(--apple-gray-50);
    flex-shrink: 0;
}

/* Modal Size Variants */
.modal-sm {
    max-width: 400px;
}

.modal-lg {
    max-width: 800px;
}

.modal-xl {
    max-width: 1000px;
}

.modal-full {
    max-width: 100%;
    max-height: 100%;
    height: 100%;
    border-radius: 0;
}

/* Action Sheet (iOS-style bottom sheet) */
.action-sheet-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(var(--apple-blur-sm));
    -webkit-backdrop-filter: blur(var(--apple-blur-sm));
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: var(--apple-z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--apple-duration-normal) var(--apple-ease);
    padding: var(--apple-space-2);
}

.action-sheet-overlay.active {
    opacity: 1;
    visibility: visible;
}

.action-sheet {
    background: var(--apple-gray-100);
    border-radius: var(--apple-radius-xl);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
    transform: translateY(100%);
    transition: transform var(--apple-duration-slow) var(--apple-ease-spring);
    margin-bottom: var(--apple-space-2);
}

.action-sheet-overlay.active .action-sheet {
    transform: translateY(0);
}

.action-sheet-group {
    background: var(--apple-white);
    border-radius: var(--apple-radius-lg);
    margin-bottom: var(--apple-space-2);
    overflow: hidden;
}

.action-sheet-group:last-child {
    margin-bottom: 0;
}

.action-sheet-title {
    padding: var(--apple-space-3) var(--apple-space-4);
    text-align: center;
    font-size: var(--apple-text-xs);
    color: var(--apple-gray-500);
    border-bottom: 0.5px solid var(--apple-gray-200);
}

.action-sheet-btn {
    width: 100%;
    padding: var(--apple-space-4);
    background: transparent;
    border: none;
    font-size: var(--apple-text-lg);
    font-weight: var(--apple-weight-regular);
    color: var(--apple-blue);
    cursor: pointer;
    transition: background var(--apple-duration-fast) var(--apple-ease);
}

.action-sheet-btn:hover {
    background: var(--apple-gray-100);
}

.action-sheet-btn:active {
    background: var(--apple-gray-200);
}

.action-sheet-btn:not(:last-child) {
    border-bottom: 0.5px solid var(--apple-gray-200);
}

.action-sheet-btn.destructive {
    color: var(--apple-red);
}

.action-sheet-btn.cancel {
    font-weight: var(--apple-weight-semibold);
}

/* Alert Dialog (iOS-style centered alert) */
.alert-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(var(--apple-blur-md));
    -webkit-backdrop-filter: blur(var(--apple-blur-md));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--apple-z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--apple-duration-normal) var(--apple-ease);
}

.alert-dialog-overlay.active {
    opacity: 1;
    visibility: visible;
}

.alert-dialog {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    width: 270px;
    overflow: hidden;
    transform: scale(1.1);
    opacity: 0;
    transition: all var(--apple-duration-normal) var(--apple-ease-spring);
    box-shadow: var(--apple-shadow-2xl);
}

.alert-dialog-overlay.active .alert-dialog {
    transform: scale(1);
    opacity: 1;
}

.alert-dialog-content {
    padding: var(--apple-space-5) var(--apple-space-4);
    text-align: center;
}

.alert-dialog-title {
    font-size: var(--apple-text-md);
    font-weight: var(--apple-weight-semibold);
    color: var(--apple-gray-900);
    margin-bottom: var(--apple-space-2);
}

.alert-dialog-message {
    font-size: var(--apple-text-sm);
    color: var(--apple-gray-600);
    line-height: 1.4;
}

.alert-dialog-actions {
    display: flex;
    border-top: 0.5px solid var(--apple-gray-200);
}

.alert-dialog-btn {
    flex: 1;
    padding: var(--apple-space-3);
    background: transparent;
    border: none;
    font-size: var(--apple-text-md);
    color: var(--apple-blue);
    cursor: pointer;
    transition: background var(--apple-duration-fast) var(--apple-ease);
}

.alert-dialog-btn:hover {
    background: var(--apple-gray-100);
}

.alert-dialog-btn:active {
    background: var(--apple-gray-200);
}

.alert-dialog-btn:not(:last-child) {
    border-right: 0.5px solid var(--apple-gray-200);
}

.alert-dialog-btn.primary {
    font-weight: var(--apple-weight-semibold);
}

.alert-dialog-btn.destructive {
    color: var(--apple-red);
}

/* Drawer (Side panel) */
.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(var(--apple-blur-xs));
    -webkit-backdrop-filter: blur(var(--apple-blur-xs));
    z-index: var(--apple-z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--apple-duration-normal) var(--apple-ease);
}

.drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.drawer {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: 400px;
    max-width: 90vw;
    background: var(--apple-white);
    box-shadow: var(--apple-shadow-2xl);
    transform: translateX(100%);
    transition: transform var(--apple-duration-slow) var(--apple-ease-spring);
    z-index: var(--apple-z-modal);
    display: flex;
    flex-direction: column;
}

.drawer-overlay.active .drawer {
    transform: translateX(0);
}

.drawer-left {
    left: 0;
    right: auto;
    transform: translateX(-100%);
}

.drawer-overlay.active .drawer-left {
    transform: translateX(0);
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--apple-space-4) var(--apple-space-5);
    border-bottom: 0.5px solid var(--apple-gray-200);
    background: var(--apple-gray-50);
}

.drawer-title {
    font-size: var(--apple-text-lg);
    font-weight: var(--apple-weight-semibold);
}

.drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--apple-space-5);
}

.drawer-footer {
    padding: var(--apple-space-4) var(--apple-space-5);
    border-top: 0.5px solid var(--apple-gray-200);
    background: var(--apple-gray-50);
    display: flex;
    gap: var(--apple-space-3);
}

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: var(--apple-space-2) var(--apple-space-3);
    background: var(--apple-gray-900);
    color: var(--apple-white);
    font-size: var(--apple-text-xs);
    font-weight: var(--apple-weight-medium);
    border-radius: var(--apple-radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--apple-duration-fast) var(--apple-ease);
    pointer-events: none;
    z-index: var(--apple-z-tooltip);
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* Popover */
.popover {
    position: absolute;
    background: var(--apple-white);
    border-radius: var(--apple-radius-lg);
    box-shadow: var(--apple-shadow-lg);
    border: 0.5px solid var(--apple-gray-200);
    z-index: var(--apple-z-popover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.popover.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.popover-arrow {
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 6px;
    overflow: hidden;
}

.popover-arrow::before {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--apple-white);
    border: 0.5px solid var(--apple-gray-200);
    transform: translateY(3px) rotate(45deg);
    left: 1px;
}

.popover-content {
    padding: var(--apple-space-3);
}

/* ========================================
   STATS CARDS - Apple Style
   ======================================== */ */

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--apple-space-4);
}

.stat-card {
    background: var(--apple-white);
    border-radius: var(--apple-radius-xl);
    padding: var(--apple-space-5);
    box-shadow: var(--apple-shadow-sm);
    transition: all var(--apple-duration-normal) var(--apple-ease);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--apple-shadow-md);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--apple-radius-md);
    background: var(--apple-blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--apple-space-4);
}

.stat-icon svg {
    width: 22px;
    height: 22px;
    color: var(--apple-blue);
}

.stat-label {
    font-size: var(--apple-text-sm);
    font-weight: var(--apple-weight-medium);
    color: var(--apple-gray-500);
    margin-bottom: var(--apple-space-2);
}

.stat-value {
    font-size: var(--apple-text-3xl);
    font-weight: var(--apple-weight-bold);
    color: var(--apple-gray-900);
    line-height: 1;
}

.stat-change {
    font-size: var(--apple-text-sm);
    margin-top: var(--apple-space-2);
    display: flex;
    align-items: center;
    gap: var(--apple-space-1);
}

.stat-change.positive {
    color: var(--apple-green);
}

.stat-change.negative {
    color: var(--apple-red);
}

/* ========================================
   EMPTY STATE - Apple Style
   ======================================== */

.empty-state {
    text-align: center;
    padding: var(--apple-space-16) var(--apple-space-6);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--apple-radius-full);
    background: var(--apple-gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--apple-space-5);
}

.empty-state-icon svg {
    width: 40px;
    height: 40px;
    color: var(--apple-gray-400);
}

.empty-state-title {
    font-size: var(--apple-text-xl);
    font-weight: var(--apple-weight-semibold);
    margin-bottom: var(--apple-space-2);
}

.empty-state-text {
    font-size: var(--apple-text-base);
    color: var(--apple-gray-500);
    margin-bottom: var(--apple-space-6);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   LOADING STATES - Apple Style
   ======================================== */

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--apple-space-10);
    color: var(--apple-gray-500);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--apple-gray-200);
    border-top-color: var(--apple-blue);
    border-radius: var(--apple-radius-full);
    animation: spin 0.8s linear infinite;
}

.spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--apple-gray-100) 25%, var(--apple-gray-50) 50%, var(--apple-gray-100) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--apple-radius-sm);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========================================
   TOASTS - Apple Style
   ======================================== */

.toast-container {
    position: fixed;
    top: 64px;
    right: var(--apple-space-6);
    z-index: var(--apple-z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--apple-space-3);
}

.toast {
    background: var(--apple-white);
    border-radius: var(--apple-radius-lg);
    padding: var(--apple-space-4) var(--apple-space-5);
    box-shadow: var(--apple-shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--apple-space-3);
    animation: slideInRight var(--apple-duration-slow) var(--apple-ease-spring);
    min-width: 320px;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--apple-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.toast-success .toast-icon {
    background: var(--apple-green-light);
    color: var(--apple-green);
}

.toast-error .toast-icon {
    background: var(--apple-red-light);
    color: var(--apple-red);
}

.toast-warning .toast-icon {
    background: var(--apple-orange-light);
    color: var(--apple-orange);
}

.toast-info .toast-icon {
    background: var(--apple-blue-light);
    color: var(--apple-blue);
}

.toast-message {
    font-size: var(--apple-text-base);
    color: var(--apple-gray-900);
}

/* ========================================
   SEGMENTED CONTROL - Apple Style
   ======================================== */

.segmented-control {
    display: inline-flex;
    background: var(--apple-gray-200);
    border-radius: var(--apple-radius-md);
    padding: 2px;
    gap: 2px;
}

.segmented-control-item {
    padding: var(--apple-space-2) var(--apple-space-4);
    font-size: var(--apple-text-sm);
    font-weight: var(--apple-weight-medium);
    color: var(--apple-gray-600);
    background: transparent;
    border: none;
    border-radius: var(--apple-radius-sm);
    cursor: pointer;
    transition: all var(--apple-duration-fast) var(--apple-ease);
}

.segmented-control-item:hover {
    color: var(--apple-gray-900);
}

.segmented-control-item.active {
    background: var(--apple-white);
    color: var(--apple-gray-900);
    box-shadow: var(--apple-shadow-sm);
}

/* ========================================
   PAGE LAYOUT - Apple Style
   ======================================== */

.page {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--apple-space-8) var(--apple-space-6);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--apple-space-8);
}

.page-title {
    font-size: var(--apple-text-3xl);
    font-weight: var(--apple-weight-bold);
}

.page-subtitle {
    font-size: var(--apple-text-lg);
    color: var(--apple-gray-500);
    margin-top: var(--apple-space-2);
}

.page-actions {
    display: flex;
    gap: var(--apple-space-3);
}

/* Section */
.section {
    margin-bottom: var(--apple-space-10);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--apple-space-5);
}

.section-title {
    font-size: var(--apple-text-xl);
    font-weight: var(--apple-weight-semibold);
}

/* ========================================
   GRID SYSTEM
   ======================================== */

.grid {
    display: grid;
    gap: var(--apple-space-6);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========================================
   UTILITIES
   ======================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: var(--apple-space-1); }
.gap-2 { gap: var(--apple-space-2); }
.gap-3 { gap: var(--apple-space-3); }
.gap-4 { gap: var(--apple-space-4); }
.gap-5 { gap: var(--apple-space-5); }
.gap-6 { gap: var(--apple-space-6); }

.mt-1 { margin-top: var(--apple-space-1); }
.mt-2 { margin-top: var(--apple-space-2); }
.mt-3 { margin-top: var(--apple-space-3); }
.mt-4 { margin-top: var(--apple-space-4); }
.mt-5 { margin-top: var(--apple-space-5); }
.mt-6 { margin-top: var(--apple-space-6); }

.mb-1 { margin-bottom: var(--apple-space-1); }
.mb-2 { margin-bottom: var(--apple-space-2); }
.mb-3 { margin-bottom: var(--apple-space-3); }
.mb-4 { margin-bottom: var(--apple-space-4); }
.mb-5 { margin-bottom: var(--apple-space-5); }
.mb-6 { margin-bottom: var(--apple-space-6); }

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.rounded-sm { border-radius: var(--apple-radius-sm); }
.rounded-md { border-radius: var(--apple-radius-md); }
.rounded-lg { border-radius: var(--apple-radius-lg); }
.rounded-xl { border-radius: var(--apple-radius-xl); }
.rounded-full { border-radius: var(--apple-radius-full); }

/* ========================================
   DARK MODE - Apple Style
   ======================================== */

@media (prefers-color-scheme: dark) {
    :root {
        /* Inverted gray scale */
        --apple-white: #1c1c1e;
        --apple-gray-50: #2c2c2e;
        --apple-gray-100: #3a3a3c;
        --apple-gray-200: #48484a;
        --apple-gray-300: #636366;
        --apple-gray-400: #8e8e93;
        --apple-gray-500: #aeaeb2;
        --apple-gray-600: #d1d1d6;
        --apple-gray-700: #e5e5ea;
        --apple-gray-800: #f2f2f7;
        --apple-gray-900: #ffffff;
        --apple-black: #ffffff;
        
        /* Vibrant dark mode colors */
        --apple-blue: #91BD62;
        --apple-blue-hover: #409cff;
        --apple-blue-light: rgba(10, 132, 255, 0.2);
        --apple-blue-subtle: rgba(10, 132, 255, 0.12);
        
        --apple-green: #30d158;
        --apple-green-light: rgba(48, 209, 88, 0.2);
        --apple-orange: #ff9f0a;
        --apple-orange-light: rgba(255, 159, 10, 0.2);
        --apple-red: #ff453a;
        --apple-red-light: rgba(255, 69, 58, 0.2);
        --apple-purple: #bf5af2;
        --apple-purple-light: rgba(191, 90, 242, 0.2);
        --apple-teal: #64d2ff;
        --apple-teal-light: rgba(100, 210, 255, 0.2);
        
        /* Dark mode shadows (subtle) */
        --apple-shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.3);
        --apple-shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.4);
        --apple-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
        --apple-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
        
        /* Dark mode glow (for focus states) */
        --apple-glow-blue: 0 0 0 4px rgba(10, 132, 255, 0.35);
    }
    
    body {
        background: #000000;
        color: #ffffff;
    }
    
    /* Navigation */
    .nav {
        background: rgba(28, 28, 30, 0.72);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }
    
    .nav-link {
        color: rgba(255, 255, 255, 0.7);
    }
    
    .nav-link:hover,
    .nav-link.active {
        color: #ffffff;
    }
    
    .nav-brand,
    .nav-logo {
        color: #ffffff;
    }
    
    /* Cards */
    .card {
        background: #1c1c1e;
        border-color: rgba(255, 255, 255, 0.1);
    }
    
    /* Forms */
    .form-input,
    .form-select,
    .form-textarea {
        background: #2c2c2e;
        border-color: #48484a;
        color: #ffffff;
    }
    
    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
        background: #3a3a3c;
        border-color: var(--apple-blue);
    }
    
    .form-input::placeholder,
    .form-textarea::placeholder {
        color: #8e8e93;
    }
    
    /* Buttons */
    .btn-secondary {
        background: #2c2c2e;
        border-color: #48484a;
        color: #ffffff;
    }
    
    .btn-secondary:hover {
        background: #3a3a3c;
    }
    
    /* Tables */
    table th,
    table td {
        border-color: #48484a;
    }
    
    table thead th {
        background: #2c2c2e;
        color: #8e8e93;
    }
    
    table tbody tr:hover {
        background: rgba(255, 255, 255, 0.05);
    }
    
    /* Modals */
    .modal-overlay {
        background: rgba(0, 0, 0, 0.7);
    }
    
    .modal {
        background: #1c1c1e;
    }
    
    .modal-header {
        border-bottom-color: #48484a;
    }
    
    .modal-footer {
        background: #2c2c2e;
        border-top-color: #48484a;
    }
    
    .modal-close {
        background: #48484a;
        color: #ffffff;
    }
    
    /* Alerts */
    .alert {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    /* Settings tabs */
    .settings-tabs {
        background: #2c2c2e;
    }
    
    .settings-tab.active {
        background: #48484a;
    }
    
    /* Settings cards */
    .settings-card {
        background: #1c1c1e;
        border-color: #48484a;
    }
    
    .settings-card-header {
        border-bottom-color: #48484a;
    }
    
    /* Calendar */
    .calendar-event {
        background: var(--apple-blue);
    }
    
    .week-header,
    .month-header,
    .day-header {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    .week-day-slot,
    .month-day {
        background: #1c1c1e;
        border-color: #3a3a3c;
    }
    
    .week-day-slot:hover,
    .month-day:hover {
        background: #2c2c2e;
    }
    
    .week-time-slot,
    .time-label {
        background: #2c2c2e;
    }
    
    .month-day.today .month-day-number,
    .week-header-cell.today .week-header-date {
        background: var(--apple-blue);
    }
    
    /* Right panel */
    .today-card,
    .upcoming-card {
        background: #1c1c1e;
        border-color: #48484a;
    }
    
    .panel-header {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    .event-item {
        background: #2c2c2e;
    }
    
    .event-item:hover {
        background: #3a3a3c;
    }
    
    /* Toast */
    .toast {
        background: #2c2c2e;
        color: #ffffff;
    }
    
    /* Search bar */
    .search-bar input {
        background: #2c2c2e;
        color: #ffffff;
    }
    
    .search-bar input:focus {
        background: #3a3a3c;
    }
    
    /* Dropdown */
    .dropdown-menu {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    .dropdown-item:hover {
        background: #3a3a3c;
    }
    
    /* Action sheet */
    .action-sheet {
        background: #2c2c2e;
    }
    
    .action-sheet-group {
        background: #3a3a3c;
    }
    
    .action-sheet-btn:hover {
        background: #48484a;
    }
    
    /* Alert dialog */
    .alert-dialog {
        background: #2c2c2e;
    }
    
    .alert-dialog-actions {
        border-top-color: #48484a;
    }
    
    .alert-dialog-btn:not(:last-child) {
        border-right-color: #48484a;
    }
    
    /* Drawer */
    .drawer {
        background: #1c1c1e;
    }
    
    .drawer-header,
    .drawer-footer {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    /* List items */
    .list-item {
        border-bottom-color: #3a3a3c;
    }
    
    .list-item:hover {
        background: #2c2c2e;
    }
    
    /* Quick actions */
    .quick-action {
        background: #2c2c2e;
        border-color: #48484a;
    }
    
    .quick-action:hover {
        background: #3a3a3c;
    }
    
    /* Scrollbar dark mode */
    ::-webkit-scrollbar-track {
        background: #1c1c1e;
    }
    
    ::-webkit-scrollbar-thumb {
        background: #48484a;
    }
    
    ::-webkit-scrollbar-thumb:hover {
        background: #636366;
    }
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .grid-4,
    .grid-3,
    .grid-2 { grid-template-columns: 1fr; }
    
    .page {
        padding: var(--apple-space-5) var(--apple-space-4);
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--apple-space-4);
    }
    
    .nav-links {
        display: none;
    }
    
    h1 {
        font-size: var(--apple-text-2xl);
    }
    
    .stat-value {
        font-size: var(--apple-text-2xl);
    }
    
    .modal {
        max-width: none;
        margin: 0;
        border-radius: var(--apple-radius-xl) var(--apple-radius-xl) 0 0;
        max-height: 90vh;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
    }
    
    .modal-overlay.active .modal,
    .modal-overlay.show .modal {
        transform: translateY(0);
    }
    
    .modal-overlay .modal {
        transform: translateY(100%);
    }
}

@media (max-width: 480px) {
    .btn {
        padding: var(--apple-space-3) var(--apple-space-4);
        font-size: var(--apple-text-sm);
    }
    
    .card {
        padding: var(--apple-space-4);
        border-radius: var(--apple-radius-lg);
    }
    
    .toast {
        min-width: auto;
        margin: 0 var(--apple-space-4);
    }
}