/* ============================================
   VALKEY FOR AI - Apple-Inspired Design System
   ============================================ */

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

:root {
    --bg: #000000;
    --bg-elevated: #0a0a0a;
    --bg-card: rgba(255,255,255,0.04);
    --bg-card-hover: rgba(255,255,255,0.07);
    --border: rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.15);
    --text-primary: #f5f5f7;
    --text-secondary: rgba(245,245,247,0.6);
    --text-tertiary: rgba(245,245,247,0.4);
    --accent: #6366f1;
    --accent-light: #818cf8;
    --gradient-1: #6366f1;
    --gradient-2: #a855f7;
    --gradient-3: #ec4899;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

a {
    color: inherit;
    text-decoration: none;
}

img { max-width: 100%; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Animations --- */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.anim-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.anim-fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(0,0,0,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.02em;
}

.nav-logo .accent {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}

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

.nav-github {
    display: flex !important;
    align-items: center;
    gap: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 100px;
    transition: all var(--transition) !important;
}

.nav-github:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99,102,241,0.3), transparent),
        radial-gradient(ellipse 60% 40% at 70% 50%, rgba(168,85,247,0.15), transparent),
        radial-gradient(ellipse 50% 50% at 30% 70%, rgba(236,72,153,0.1), transparent);
    animation: pulse 8s ease-in-out infinite;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    margin-bottom: 32px;
}

.hero-title {
    font-size: clamp(48px, 8vw, 88px);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 6s ease-in-out infinite;
}

.hero-subtitle {
    font-size: clamp(17px, 2vw, 20px);
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 620px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    box-shadow: 0 0 20px rgba(99,102,241,0.3), 0 0 60px rgba(99,102,241,0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(99,102,241,0.4), 0 0 80px rgba(99,102,241,0.15);
}

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

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-large {
    padding: 18px 36px;
    font-size: 17px;
}

/* --- Hero Stats --- */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

/* --- Sections --- */
.section {
    padding: 120px 0;
    position: relative;
}

.section-dark {
    background: var(--bg-elevated);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-light);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

/* --- Bento Grid (Use Cases) --- */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.bento-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.bento-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.08), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition);
}

.bento-card {
    cursor: pointer;
}

.bento-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px) scale(1.01);
    box-shadow: 0 8px 32px rgba(168, 85, 247, 0.08), 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.bento-card:hover::before {
    opacity: 1;
}

.bento-large {
    grid-column: span 2;
}

.bento-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--icon-bg, var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.bento-card h3 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.bento-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.bento-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.bento-tags span {
    padding: 4px 12px;
    background: rgba(255,255,255,0.06);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-tertiary);
}

/* --- Steps (How It Works) --- */
.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.step-card {
    flex: 1;
    max-width: 340px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all var(--transition);
}

.step-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.step-number {
    font-size: 48px;
    font-weight: 900;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    line-height: 1;
}

.step-card h3 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.step-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.step-connector {
    flex-shrink: 0;
    opacity: 0.4;
}

/* --- Cookbook Cards --- */
.cookbook-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.cookbook-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.cookbook-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.cookbook-difficulty {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
    width: fit-content;
}

.cookbook-difficulty.easy {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

.cookbook-difficulty.medium {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}

.cookbook-difficulty.hard {
    background: rgba(244, 63, 94, 0.15);
    color: #fb7185;
}

.cookbook-card h3 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.cookbook-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 20px;
}

.cookbook-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.cookbook-lang {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-light);
}

.cookbook-time {
    font-size: 13px;
    color: var(--text-tertiary);
}

/* --- Architecture Cards --- */
.arch-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.arch-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.arch-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.arch-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
    padding: 24px 16px;
    background: rgba(255,255,255,0.02);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.04);
}

.arch-node {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.arch-node-app {
    background: rgba(99,102,241,0.15);
    color: #818cf8;
    border: 1px solid rgba(99,102,241,0.3);
}

.arch-node-valkey {
    background: rgba(168,85,247,0.15);
    color: #c084fc;
    border: 1px solid rgba(168,85,247,0.3);
}

.arch-node-llm {
    background: rgba(236,72,153,0.15);
    color: #f472b6;
    border: 1px solid rgba(236,72,153,0.3);
}

.arch-arrow {
    color: var(--text-tertiary);
    font-size: 18px;
}

.arch-card h3 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
}

.arch-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.arch-details {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.arch-details span {
    padding: 4px 12px;
    background: rgba(255,255,255,0.06);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-tertiary);
}

/* --- CTA Section --- */
.cta-section {
    padding: 80px 0 120px;
}

.cta-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    padding: 80px 48px;
    text-align: center;
    border: 1px solid var(--border);
}

.cta-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 60% 80% at 50% 120%, rgba(99,102,241,0.25), transparent),
        radial-gradient(ellipse 80% 60% at 50% -20%, rgba(168,85,247,0.15), transparent);
    z-index: 0;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 16px;
    line-height: 1.1;
}

.cta-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* --- Footer --- */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .nav-logo {
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.footer-links-group {
    display: flex;
    gap: 80px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.footer-col a {
    font-size: 14px;
    color: var(--text-tertiary);
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-tertiary);
    text-align: center;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bento-large {
        grid-column: span 2;
    }
    .arch-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }
    .cookbook-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .nav-mobile-toggle {
        display: flex;
    }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(0,0,0,0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
    }
    .hero {
        padding: 100px 20px 60px;
        min-height: auto;
    }
    .hero-title {
        font-size: clamp(36px, 10vw, 56px);
    }
    .hero-actions {
        flex-direction: column;
        margin-bottom: 48px;
    }
    .hero-stats {
        gap: 24px;
    }
    .stat-num {
        font-size: 22px;
    }
    .section {
        padding: 80px 0;
    }
    .bento-grid {
        grid-template-columns: 1fr;
    }
    .bento-large {
        grid-column: span 1;
    }
    .steps-grid {
        flex-direction: column;
    }
    .step-connector {
        transform: rotate(90deg);
    }
    .step-card {
        max-width: 100%;
        width: 100%;
    }
    .cookbook-grid {
        grid-template-columns: 1fr;
    }
    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }
    .footer-links-group {
        gap: 48px;
    }
    .cta-card {
        padding: 48px 24px;
    }
    .btn-large {
        padding: 16px 28px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    .stat-divider {
        width: 40px;
        height: 1px;
    }
}

/* --- Light Mode --- */
.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 100px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
    margin-left: 8px;
}
.theme-toggle:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}
.theme-toggle svg { transition: transform 0.3s; }
.theme-toggle:hover svg { transform: rotate(30deg); }

body.light {
    --bg: #ffffff;
    --bg-elevated: #f5f5f7;
    --bg-card: rgba(0,0,0,0.03);
    --bg-card-hover: rgba(0,0,0,0.06);
    --border: rgba(0,0,0,0.08);
    --border-hover: rgba(0,0,0,0.15);
    --text-primary: #1d1d1f;
    --text-secondary: rgba(29,29,31,0.6);
    --text-tertiary: rgba(29,29,31,0.4);
}
body.light .hero-gradient {
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99,102,241,0.1), transparent),
        radial-gradient(ellipse 60% 40% at 70% 50%, rgba(168,85,247,0.06), transparent);
}
body.light .nav.scrolled {
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(20px);
}
body.light .gradient-text {
    background: linear-gradient(135deg, #4f46e5, #7c3aed, #db2777);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.light .nav { background: rgba(255,255,255,0.85); }
body.light .nav-github { background: rgba(0,0,0,0.04); border-color: rgba(0,0,0,0.1); }
body.light .nav-mobile-toggle span { background: #1d1d1f; }
body.light .bento-tags span { background: rgba(0,0,0,0.06); color: rgba(0,0,0,0.5); }
body.light .btn-secondary { background: rgba(0,0,0,0.04); border-color: rgba(0,0,0,0.1); color: #1d1d1f; }
body.light .footer { border-color: rgba(0,0,0,0.08); }
body.light .cta-card { border-color: rgba(0,0,0,0.08); }
body.light .stat-divider { background: rgba(0,0,0,0.1); }