/* ImageWhisperer - Sophisticated Apple-inspired Design System */

:root {
    /* Color Palette - Professional & Creative */
    --primary: #007AFF;
    --secondary: #5856D6;
    --success: #34C759;
    --warning: #FF9500;
    --danger: #FF3B30;
    --info: #5AC8FA;
    
    /* Grays - Apple System Colors */
    --gray-50: #F9FAFB;
    --gray-100: #F2F2F7;
    --gray-200: #E5E5EA;
    --gray-300: #C7C7CC;
    --gray-400: #8E8E93;
    --gray-500: #636366;
    --gray-600: #48484A;
    --gray-700: #363638;
    --gray-800: #2C2C2E;
    --gray-900: #1C1C1E;
    
    /* Semantic Colors */
    --background: #FFFFFF;
    --surface: #F2F2F7;
    --surface-elevated: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #636366;
    --text-tertiary: #8E8E93;
    --border: rgba(0, 0, 0, 0.1);
    --shadow: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    
    /* Animation */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #000000;
        --surface: #1C1C1E;
        --surface-elevated: #2C2C2E;
        --text-primary: #FFFFFF;
        --text-secondary: #8E8E93;
        --text-tertiary: #636366;
        --border: rgba(255, 255, 255, 0.1);
        --shadow: rgba(0, 0, 0, 0.3);
    }
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* Typography */
h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 28px;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
}

p {
    font-size: 17px;
    line-height: 1.6;
    color: var(--text-secondary);
}

.lead {
    font-size: 20px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 24px;
    font-size: 17px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

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

.btn-primary:hover {
    background: #0051D5;
    transform: translateY(-1px);
    box-shadow: 0 8px 16px rgba(0, 122, 255, 0.3);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--gray-100);
    transform: translateY(-1px);
}

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

.btn-ghost:hover {
    background: rgba(0, 122, 255, 0.1);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
    border-radius: var(--radius-lg);
}

/* Cards */
.card {
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid var(--border);
    transition: all var(--transition-base);
    position: relative;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 24px var(--shadow),
        0 0 0 1px var(--border);
}

.card-glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

@media (prefers-color-scheme: dark) {
    .card-glass {
        background: rgba(28, 28, 30, 0.7);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* Input Fields */
.input-group {
    margin-bottom: var(--space-lg);
}

.input-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    font-family: var(--font-sans);
}

.input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.textarea {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 14px;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

@media (prefers-color-scheme: dark) {
    .nav {
        background: rgba(0, 0, 0, 0.8);
    }
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 20px;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link.active {
    color: var(--primary);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 149, 0, 0.1);
    color: var(--warning);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-fluid {
    padding: 0 var(--space-lg);
}

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

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

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

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease-out;
}

.animate-slideIn {
    animation: slideIn 0.3s ease-out;
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Loading States */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--gray-200) 25%,
        var(--gray-100) 50%,
        var(--gray-200) 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

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

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 12px;
    background: var(--gray-900);
    color: white;
    font-size: 12px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.tooltip:hover::after {
    opacity: 1;
}

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-sm); }
.gap-2 { gap: var(--space-md); }
.gap-3 { gap: var(--space-lg); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }