/* ============================================
   SIBACUS-SPICE — Premium EDA Landing Page
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Color Palette — Deep Navy / Electric Cyan */
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f1424;
    --bg-tertiary: #141a2e;
    --bg-card: rgba(20, 26, 46, 0.7);
    --bg-card-hover: rgba(30, 40, 70, 0.8);
    --bg-glass: rgba(15, 20, 36, 0.6);

    --text-primary: #e8ecf4;
    --text-secondary: #8a94a8;
    --text-muted: #5a6478;

    --accent-cyan: #00d4ff;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #00d4ff, #3b82f6, #8b5cf6);
    --accent-glow: 0 0 30px rgba(0, 212, 255, 0.15);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(0, 212, 255, 0.2);

    --bar-legacy: #ef4444;
    --bar-sibacus: #00d4ff;

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --section-padding: clamp(4rem, 8vw, 8rem);
    --container-max: 1200px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 0.3s var(--ease-out);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    box-shadow: 0 1px 0 var(--border-subtle);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    color: var(--accent-cyan);
    font-size: 1.5rem;
}

.logo-accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-base);
}

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

.nav-cta {
    padding: 0.5rem 1.25rem !important;
    border-radius: 8px;
    background: var(--accent-gradient) !important;
    color: var(--bg-primary) !important;
    font-weight: 600 !important;
    transition: opacity var(--transition-base), transform var(--transition-base) !important;
}

.nav-cta:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 0 4rem;
    overflow: hidden;
}

#hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.4;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
}

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    border: 1px solid var(--border-accent);
    background: rgba(0, 212, 255, 0.06);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s var(--ease-out) both;
}

.hero-title {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s var(--ease-out) 0.1s both;
}

.hero-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
    line-height: 1.8;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.stat-suffix {
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 0.4rem;
}

.stat-divider {
    width: 1px;
    height: 3rem;
    background: var(--border-subtle);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

.hero-fade {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to bottom, transparent, var(--bg-primary));
    z-index: 1;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

/* --- Section Styling --- */
.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.section-desc {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    color: var(--text-secondary);
    max-width: 650px;
    line-height: 1.8;
    margin-bottom: 3rem;
}

/* --- Problem Section --- */
.problem {
    padding: var(--section-padding) 0;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.problem-card {
    padding: 2rem;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
}

.problem-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: var(--accent-glow);
}

.problem-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.problem-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.problem-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Benchmarks Section --- */
.benchmarks {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
}

.benchmark-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.benchmark-card {
    padding: 2rem;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
}

.benchmark-card:hover {
    border-color: var(--border-accent);
    box-shadow: var(--accent-glow);
}

.benchmark-header {
    margin-bottom: 1rem;
}

.benchmark-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.15);
}

.benchmark-name {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.benchmark-detail {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.benchmark-bar-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.benchmark-bar-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.benchmark-bar-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 90px;
    text-align: right;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.benchmark-bar-track {
    flex: 1;
    height: 28px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

.benchmark-bar {
    height: 100%;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.75rem;
    width: 0%;
    transition: width 1.2s var(--ease-out);
}

.benchmark-bar.legacy {
    background: linear-gradient(90deg, #dc2626, #ef4444);
}

.benchmark-bar.sibacus {
    background: var(--accent-gradient);
    min-width: fit-content;
    padding: 0 0.75rem;
}

.bar-value {
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: white;
    white-space: nowrap;
}

.benchmark-speedup {
    font-size: 1.6rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
}

.benchmark-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    background: rgba(0, 212, 255, 0.04);
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.note-icon {
    font-size: 1.1rem;
    color: var(--accent-cyan);
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.benchmark-note p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Impact Section --- */
.impact {
    padding: var(--section-padding) 0;
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.impact-card {
    padding: 2rem;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    text-align: center;
    transition: all var(--transition-base);
}

.impact-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: var(--accent-glow);
}

.impact-ring-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 1.25rem;
}

.impact-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.04);
    stroke-width: 6;
}

.ring-fill {
    fill: none;
    stroke: url(#ring-gradient);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 326.73;
    transition: stroke-dashoffset 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.ring-fill.animated {
    /* dashoffset is set dynamically by JS */
}

/* Fallback gradient for ring — applied via CSS */
.ring-fill {
    stroke: var(--accent-cyan);
}

.impact-ring-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.impact-percent {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.impact-suffix {
    font-size: 1rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.impact-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.impact-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.impact-note {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    background: rgba(139, 92, 246, 0.04);
    border: 1px solid rgba(139, 92, 246, 0.1);
}

.impact-note p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Capabilities Section --- */
.capabilities {
    padding: var(--section-padding) 0;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.capability-card {
    padding: 2rem;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.capability-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: var(--accent-glow);
}

.capability-number {
    font-size: 3rem;
    font-weight: 900;
    font-family: var(--font-mono);
    color: rgba(0, 212, 255, 0.07);
    position: absolute;
    top: 0.75rem;
    right: 1.25rem;
    line-height: 1;
}

.capability-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.capability-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Use Cases Section --- */
.use-cases {
    padding: var(--section-padding) 0;
    background: var(--bg-secondary);
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.use-case-card {
    padding: 2.5rem;
    border-radius: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
}

.use-case-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
    box-shadow: var(--accent-glow);
}

.use-case-icon {
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
}

.use-case-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.use-case-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.use-case-list {
    list-style: none;
}

.use-case-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.use-case-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-cyan);
}

/* --- CTA Section --- */
.cta-section {
    padding: var(--section-padding) 0;
}

.cta-card {
    padding: clamp(2.5rem, 5vw, 4rem);
    border-radius: 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at top center, rgba(0, 212, 255, 0.06), transparent 60%);
    pointer-events: none;
}

.cta-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    position: relative;
}

.cta-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
    position: relative;
}

.cta-form {
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group.full-width {
    margin-bottom: 1.5rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group select option {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: 1rem;
    font-size: 1rem;
}

/* --- Footer --- */
.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-subtle);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.footer-tagline {
    width: 100%;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.footer-legal {
    text-align: right;
}

.footer-legal p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-patent {
    font-size: 0.75rem !important;
    color: var(--text-muted);
    opacity: 0.7;
    margin-top: 0.25rem;
}

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

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Animated bars */
.benchmark-bar.animated {
    transition: width 1.2s var(--ease-out);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-links a:not(.nav-cta) {
        display: none;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-divider {
        width: 3rem;
        height: 1px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-legal {
        text-align: center;
    }

    .capabilities-grid {
        grid-template-columns: 1fr;
    }

    .benchmark-grid {
        grid-template-columns: 1fr;
    }

    .impact-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-case-grid {
        grid-template-columns: 1fr;
    }
}