/**
 * Apple-Inspired Design System for SchoolOS
 * Clean, minimalist, and elegant UI following Apple's design principles
 */

:root {
    /* Apple Color Palette */
    --apple-blue: #007AFF;
    --apple-blue-dark: #0051D5;
    --apple-blue-light: #5AC8FA;
    --apple-gray-1: #F5F5F7;
    --apple-gray-2: #E5E5EA;
    --apple-gray-3: #D1D1D6;
    --apple-gray-4: #C7C7CC;
    --apple-gray-5: #AEAEB2;
    --apple-gray-6: #8E8E93;
    --apple-gray-7: #636366;
    --apple-gray-8: #48484A;
    --apple-gray-9: #1C1C1E;
    
    /* Text Colors */
    --text-primary: #1C1C1E;
    --text-secondary: #636366;
    --text-tertiary: #8E8E93;
    --text-white: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F7;
    --bg-tertiary: #E5E5EA;
    
    /* Accent Colors */
    --accent-blue: #007AFF;
    --accent-green: #34C759;
    --accent-orange: #FF9500;
    --accent-red: #FF3B30;
    --accent-purple: #AF52DE;
    --accent-pink: #FF2D55;
    --accent-teal: #5AC8FA;
    
    /* Shadows (Apple-style subtle) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    
    /* Border Radius (Apple-style subtle) */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Spacing (8px grid) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    
    /* Typography */
    --font-sf: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 17px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-2xl: 28px;
    --font-size-3xl: 34px;
    --font-size-4xl: 40px;
    
    /* Transitions (Apple-style smooth) */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sf);
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); font-weight: 700; }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.47059;
}

/* Buttons (Apple-style) */
.btn-apple {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    background: var(--apple-blue);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.btn-apple:hover {
    background: var(--apple-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-apple:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-apple-secondary {
    background: rgba(0, 122, 255, 0.1);
    color: var(--apple-blue);
}

.btn-apple-secondary:hover {
    background: rgba(0, 122, 255, 0.15);
}

/* Cards (Apple-style) */
.card-apple {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 0.5px solid rgba(0, 0, 0, 0.1);
    transition: all var(--transition-base);
}

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

/* Glassmorphism Effect */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border: 0.5px solid rgba(255, 255, 255, 0.8);
}

/* Stat Cards */
.stat-card-apple {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 0.5px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-base);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.stat-card-apple::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card-apple:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 0, 0, 0.1);
}

.stat-card-apple:hover::before {
    opacity: 1;
}

.stat-card-apple.blue::before { background: linear-gradient(90deg, var(--apple-blue), var(--apple-blue-light)); }
.stat-card-apple.green::before { background: linear-gradient(90deg, var(--accent-green), #30D158); }
.stat-card-apple.orange::before { background: linear-gradient(90deg, var(--accent-orange), #FFB340); }
.stat-card-apple.purple::before { background: linear-gradient(90deg, var(--accent-purple), #BF5AF2); }
.stat-card-apple.pink::before { background: linear-gradient(90deg, var(--accent-pink), #FF6482); }
.stat-card-apple.teal::before { background: linear-gradient(90deg, var(--accent-teal), #70D7FF); }
.stat-card-apple.red::before { background: linear-gradient(90deg, var(--accent-red), #FF6961); }
.stat-card-apple.yellow::before { background: linear-gradient(90deg, #FFCC00, #FFD60A); }

.stat-icon-apple {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-white);
    margin-bottom: var(--space-4);
}

.stat-icon-apple.blue { background: linear-gradient(135deg, var(--apple-blue), var(--apple-blue-light)); }
.stat-icon-apple.green { background: linear-gradient(135deg, var(--accent-green), #30D158); }
.stat-icon-apple.orange { background: linear-gradient(135deg, var(--accent-orange), #FFB340); }
.stat-icon-apple.purple { background: linear-gradient(135deg, var(--accent-purple), #BF5AF2); }
.stat-icon-apple.pink { background: linear-gradient(135deg, var(--accent-pink), #FF6482); }
.stat-icon-apple.teal { background: linear-gradient(135deg, var(--accent-teal), #70D7FF); }
.stat-icon-apple.red { background: linear-gradient(135deg, var(--accent-red), #FF6961); }
.stat-icon-apple.yellow { background: linear-gradient(135deg, #FFCC00, #FFD60A); }

.stat-value-apple {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    line-height: 1;
    letter-spacing: -0.04em;
}

.stat-label-apple {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: -0.01em;
}

/* Forms */
.form-apple {
    width: 100%;
}

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

.form-label-apple {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    letter-spacing: -0.01em;
}

.form-control-apple {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-family: var(--font-sf);
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 0.5px solid var(--apple-gray-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    -webkit-appearance: none;
    appearance: none;
}

.form-control-apple:focus {
    outline: none;
    border-color: var(--apple-blue);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-control-apple::placeholder {
    color: var(--text-tertiary);
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group-icon {
    position: absolute;
    left: var(--space-4);
    color: var(--text-tertiary);
    z-index: 1;
    font-size: var(--font-size-base);
}

.input-group .form-control-apple {
    padding-left: calc(var(--space-4) + 24px + var(--space-3));
}

/* Alerts */
.alert-apple {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-base);
    border: 0.5px solid;
}

.alert-apple.info {
    background: rgba(0, 122, 255, 0.1);
    color: var(--apple-blue-dark);
    border-color: rgba(0, 122, 255, 0.2);
}

.alert-apple.success {
    background: rgba(52, 199, 89, 0.1);
    color: #248A3D;
    border-color: rgba(52, 199, 89, 0.2);
}

.alert-apple.warning {
    background: rgba(255, 149, 0, 0.1);
    color: #CC7700;
    border-color: rgba(255, 149, 0, 0.2);
}

.alert-apple.error {
    background: rgba(255, 59, 48, 0.1);
    color: #CC2E24;
    border-color: rgba(255, 59, 48, 0.2);
}

/* Grid System */
.grid-apple {
    display: grid;
    gap: var(--space-5);
}

.grid-apple.cols-1 { grid-template-columns: 1fr; }
.grid-apple.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-apple.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-apple.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-apple.auto-fit { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }

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

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in {
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in {
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Responsive */
@media (max-width: 768px) {
    .grid-apple.cols-2,
    .grid-apple.cols-3,
    .grid-apple.cols-4 {
        grid-template-columns: 1fr;
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
}

/* Apple-style Scrollbar (WebKit) */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--apple-gray-4);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--apple-gray-5);
}