/* ============================================
   SpicyAIApps - Main CSS
   Global styles, variables, typography, layout
   ============================================ */

/* CSS Custom Properties (Design System) */
:root {
    /* Background Colors */
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: rgba(31, 41, 55, 0.8);
    --bg-card-hover: rgba(31, 41, 55, 0.95);
    --bg-overlay: rgba(15, 15, 35, 0.95);

    /* Brand Colors */
    --purple-primary: #a855f7;
    --purple-secondary: #8b5cf6;
    --purple-dark: #9333ea;
    --purple-darker: #7c3aed;
    --red-accent: #ef4444;
    --pink-accent: #ec4899;

    /* Status Colors */
    --success: #22c55e;
    --warning: #fbbf24;
    --danger: #ef4444;
    --info: #3b82f6;

    /* Text Colors */
    --text-primary: #f3f4f6;
    --text-secondary: #e5e7eb;
    --text-muted: #9ca3af;
    --text-subtle: #d1d5db;

    /* Border Colors */
    --border-light: rgba(255, 255, 255, 0.1);
    --border-purple: rgba(168, 85, 247, 0.3);
    --border-purple-hover: rgba(168, 85, 247, 0.6);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    --shadow-purple: 0 8px 24px rgba(168, 85, 247, 0.3);
    --shadow-gold: 0 4px 12px rgba(251, 191, 36, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Layout */
    --container-max: 1200px;
    --header-height: 70px;
}

/* CSS Reset */
*,
*::before,
*::after {
    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-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-secondary);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-subtle);
}

a {
    color: var(--purple-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--purple-secondary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

/* Layout Utilities */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

.section {
    padding: var(--spacing-3xl) 0;
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, var(--purple-primary) 0%, var(--red-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Header */
.header {
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: transform var(--transition-base);
}

.header.hidden {
    transform: translateY(-100%);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    min-height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
}

.logo-image {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

.logo-text {
    background: linear-gradient(135deg, var(--purple-primary) 0%, var(--red-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav a {
    color: var(--text-subtle);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-sm) 0;
}

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

.nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: var(--purple-primary);
    transition: width var(--transition-base);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: var(--spacing-sm);
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand .logo-text {
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    max-width: 300px;
}

.footer-section h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-section a {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: var(--purple-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-disclosure {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.5;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-overlay);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-light);
    }

    .nav.active {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand p {
        margin: 0 auto;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.25rem;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }
}

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

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

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

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}