/* ==========================================
   CreaDev Design System — Apple-Inspired
   Modern, Minimal, Elegant
   ========================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* CSS Custom Properties */
:root {
    /* Colors — Sophisticated neutral palette with indigo accent */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #e8e8ed;
    --color-surface: #ffffff;
    --color-surface-hover: #f5f5f7;
    --color-border: #d2d2d7;
    --color-border-light: #e8e8ed;

    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-text-tertiary: #86868b;
    --color-text-inverse: #ffffff;

    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: #eef2ff;
    --color-primary-dark: #4338ca;

    --color-success: #22c55e;
    --color-success-light: #f0fdf4;
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-danger: #ef4444;
    --color-danger-light: #fef2f2;
    --color-info: #3b82f6;
    --color-info-light: #eff6ff;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-hero: clamp(2.5rem, 5vw, 5rem);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.05);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Transitions */
    --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);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout */
    --container-max: 1200px;
    --container-wide: 1400px;
    --header-height: 64px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ==========================================
   HEADER / NAVIGATION
   ========================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transition: background var(--transition-base);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.site-logo {
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.site-logo span { color: var(--color-primary); }

.site-nav { display: flex; align-items: center; gap: var(--space-8); }
.site-nav a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}
.site-nav a:hover, .site-nav a.active { color: var(--color-text); }
.site-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
    border-radius: 1px;
}
.site-nav a:hover::after, .site-nav a.active::after { width: 100%; }

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    background: var(--color-primary);
    color: var(--color-text-inverse) !important;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
    border: none;
}
.nav-cta:hover { background: var(--color-primary-hover); transform: scale(1.02); color: var(--color-text-inverse) !important; }

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-2);
    color: var(--color-text);
}
.menu-toggle svg { width: 24px; height: 24px; }

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-8);
        gap: var(--space-6);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }
    .site-nav.open { transform: translateX(0); }
    .site-nav a { font-size: var(--text-lg); }
}

/* ==========================================
   CONTAINER & SECTIONS
   ========================================== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}
.container-wide { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--space-6); }

.section {
    padding: var(--space-24) 0;
}
.section-sm { padding: var(--space-16) 0; }
.section-lg { padding: var(--space-32) 0; }

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto var(--space-16);
}
.section-label {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}
.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}
.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--header-height) + var(--space-16)) var(--space-6) var(--space-16);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(99,102,241,0.06) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(99,102,241,0.04) 0%, transparent 50%);
    animation: heroGlow 15s ease-in-out infinite alternate;
}
@keyframes heroGlow {
    0% { transform: translate(0,0) rotate(0deg); }
    100% { transform: translate(2%,-2%) rotate(3deg); }
}

.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-6);
    border: 1px solid rgba(99,102,241,0.1);
}
.hero h1 {
    font-size: var(--text-hero);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: var(--text-xl);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    line-height: 1.6;
}
.hero-actions { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; }

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.5;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); box-shadow: var(--shadow-glow); color: var(--color-text-inverse); }
.btn-secondary { background: var(--color-bg-secondary); color: var(--color-text); border: 1px solid var(--color-border); }
.btn-secondary:hover { background: var(--color-bg-tertiary); color: var(--color-text); }
.btn-outline { background: transparent; color: var(--color-primary); border: 1.5px solid var(--color-primary); }
.btn-outline:hover { background: var(--color-primary-light); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-ghost { background: transparent; color: var(--color-text-secondary); }
.btn-ghost:hover { background: var(--color-bg-secondary); color: var(--color-text); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); border-radius: var(--radius-xl); }
.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-icon { padding: var(--space-2); border-radius: var(--radius-md); }
.btn-icon svg { width: 20px; height: 20px; }

/* ==========================================
   CARDS
   ========================================== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}
.card:hover { box-shadow: var(--shadow-lg); border-color: var(--color-border); transform: translateY(-2px); }
.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-3); letter-spacing: -0.02em; }
.card p { color: var(--color-text-secondary); font-size: var(--text-sm); line-height: 1.6; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

/* ==========================================
   FORMS
   ========================================== */
.form-group { margin-bottom: var(--space-5); }
.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
    outline: none;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.form-input::placeholder { color: var(--color-text-tertiary); }
.form-textarea { resize: vertical; min-height: 100px; }
.form-error { font-size: var(--text-xs); color: var(--color-danger); margin-top: var(--space-1); }
.form-hint { font-size: var(--text-xs); color: var(--color-text-tertiary); margin-top: var(--space-1); }

/* ==========================================
   BADGES / TAGS
   ========================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    line-height: 1.6;
}
.badge-primary { background: var(--color-primary-light); color: var(--color-primary); }
.badge-success { background: var(--color-success-light); color: #16a34a; }
.badge-warning { background: var(--color-warning-light); color: #d97706; }
.badge-danger { background: var(--color-danger-light); color: var(--color-danger); }
.badge-info { background: var(--color-info-light); color: var(--color-info); }
.badge-neutral { background: var(--color-bg-secondary); color: var(--color-text-secondary); }

/* ==========================================
   FOOTER
   ========================================== */
.site-footer {
    background: var(--color-text);
    color: var(--color-text-inverse);
    padding: var(--space-16) 0 var(--space-8);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}
.footer-brand p { color: rgba(255,255,255,0.6); font-size: var(--text-sm); margin-top: var(--space-4); max-width: 300px; line-height: 1.6; }
.footer-col h4 { font-size: var(--text-sm); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: var(--space-4); color: rgba(255,255,255,0.4); }
.footer-col a { display: block; color: rgba(255,255,255,0.7); font-size: var(--text-sm); padding: var(--space-1) 0; transition: color var(--transition-fast); }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--space-8); display: flex; justify-content: space-between; align-items: center; font-size: var(--text-xs); color: rgba(255,255,255,0.4); }

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
    .footer-bottom { flex-direction: column; gap: var(--space-4); text-align: center; }
    .section-title { font-size: var(--text-3xl); }
    .card-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   ANIMATIONS
   ========================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* Skeleton loader */
.skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* Utility: visually hidden */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }