/* Global color system */
:root {
    --bg-main: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: #17233D;
    --bg-elevated: #233049;
    --primary: #220a8e;
    --primary-dark: #370ba9;
    --primary-soft: rgba(13, 46, 181, 0.12);
    --text-main: #FFFFFF;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
    --radius: 1.5rem;
    --radius-sm: 0.85rem;
    --transition: all 0.25s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(180deg, var(--bg-main) 0%, var(--bg-secondary) 100%);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

button,
input,
select,
textarea {
    font: inherit;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.88);
    backdrop-filter: blur(18px);
    z-index: 1000;
    padding: 18px 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
}

header.scrolled {
    padding: 12px 0;
    background: rgba(15, 23, 42, 0.96);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
}

.logo-text h1 {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-main);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: none;
    border-radius: 999px;
    padding: 14px 26px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-main);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 16px 30px rgba(221, 75, 255, 0.18);
    cursor: pointer;
    transition: var(--transition);
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.cta-button.secondary {
    background: transparent;
    color: var(--text-main);
    border: 1.5px solid rgba(255,255,255,0.18);
    box-shadow: none;
}

.cta-button.secondary:hover {
    background: rgba(255,255,255,0.05);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    color: var(--text-main);
    cursor: pointer;
}

/* Hero */
.hero {
    padding: 160px 0 96px;
    background: radial-gradient(circle at top left, rgba(221, 75, 255, 0.12), transparent 34%),
                radial-gradient(circle at top right, rgba(255,255,255,0.05), transparent 25%),
                linear-gradient(180deg, var(--bg-main) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    background: rgba(221, 75, 255, 0.12);
    border: 1px solid rgba(221, 75, 255, 0.18);
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2.8rem, 4vw, 4.2rem);
    line-height: 1.05;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 1.25rem;
}

.hero h1 span {
    color: var(--primary);
}

.hero p {
    max-width: 620px;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.hero-stats > div {
    display: grid;
    gap: 0.35rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
}

.hero-detection-wrap {
    position: relative;
    border-radius: 2rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: var(--bg-secondary);
}

.hero-detection-wrap img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    filter: brightness(0.88) saturate(1.05);
}

.hero-hud {
    position: absolute;
    bottom: 18px;
    left: 18px;
    right: 18px;
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 999px;
    padding: 12px 18px;
    display: flex;
    justify-content: space-between;
    color: var(--primary);
    font-size: 0.82rem;
    font-weight: 700;
}

.video-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.28);
    cursor: pointer;
    transition: var(--transition);
}

.video-overlay:hover {
    background: rgba(0,0,0,0.4);
}

.play-button {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--primary);
    display: grid;
    place-items: center;
    color: var(--text-main);
    font-size: 1.4rem;
    box-shadow: 0 16px 34px rgba(221, 75, 255, 0.28);
}

/* Sections */
section {
    padding: 90px 0;
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 3rem;
}

.section-subtitle {
    display: inline-flex;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 0.78rem;
    color: var(--primary);
    margin-bottom: 0.85rem;
}

.section-title {
    font-size: clamp(2rem, 3vw, 2.8rem);
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.section-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Cards */
.card,
.feature-card,
.req-card,
.step-card,
.viz-card,
.comp-col {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.22);
}

.feature-card,
.req-card,
.step-card,
.viz-card,
.comp-col {
    padding: 1.9rem;
    transition: var(--transition);
}

.feature-card:hover,
.req-card:hover,
.step-card:hover,
.viz-card:hover,
.comp-col:hover {
    transform: translateY(-4px);
    border-color: rgba(221, 75, 255, 0.22);
}

.features-grid,
.req-grid,
.classes-grid,
.workflow-steps,
.realtime-grid,
.comp-grid {
    display: grid;
    gap: 1.8rem;
}

.features-grid,
.req-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.classes-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

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

.realtime-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
}

.comp-grid {
    grid-template-columns: 1fr auto 1fr;
    align-items: stretch;
}
.class-icon {
    padding: 15px;
}

.feature-icon,
.req-icon,
.class-icon,
.step-number,
.vs-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.feature-icon,
.req-icon,
.class-icon {
    width: 56px;
    height: 56px;
    border-radius: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-main);
    font-size: 1.4rem;
    margin-bottom: 1.4rem;
}

.feature-card h3,
.req-card h3,
.step-card h3,
.comp-col h3,
.viz-card h3 {
    color: var(--text-main);
    margin-bottom: 0.9rem;
    font-size: 1.25rem;
}

.feature-card p,
.req-card ul,
.step-card p,
.viz-card p,
.comp-col p,
.section-description {
    color: var(--text-secondary);
}

.feature-card p,
.step-card p,
.viz-card p,
.comp-col p {
    line-height: 1.8;
}

.req-card ul {
    list-style: none;
    display: grid;
    gap: 0.75rem;
    padding: 0;
}

.req-card ul li {
    color: var(--text-secondary);
    font-size: 0.94rem;
}

.class-item {
    background: var(--bg-secondary);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 1.4rem;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-main);
    transition: var(--transition);
}

.class-item:hover {
    border-color: rgba(221, 75, 255, 0.24);
}

.class-icon {
    width: 48px;
    height: 48px;
    font-size: 1.3rem;
}

.ai-canvas {
    position: relative;
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.06));
    border-radius: 1.5rem;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    border: 1px solid rgba(255,255,255,0.06);
}

.bbox {
    position: absolute;
    border: 2px solid rgba(69, 28, 236, 0.7);
    border-radius: 0.55rem;
    background: rgba(54, 37, 159, 0.14);
    animation: pulse 2s infinite;
}

.bbox::before {
    content: attr(data-label);
    position: absolute;
    top: -24px;
    left: 0;
    padding: 0.35rem 0.9rem;
    border-radius: 999px;
    background: var(--primary);
    color: var(--text-main);
    font-size: 0.7rem;
    font-weight: 700;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.03); }
}

.hud-stats {
    position: absolute;
    inset: auto 18px 18px 18px;
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 999px;
    padding: 0.85rem 1rem;
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    color: var(--text-main);
    font-size: 0.75rem;
    font-weight: 700;
}

.step-card {
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 999px;
    background: var(--primary);
    color: var(--text-main);
    font-weight: 800;
    display: grid;
    place-items: center;
    margin: 0 auto 1rem;
}

.bar-list {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.bar-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 12px;
}

.bar-label {
    color: var(--text-main);
    font-weight: 600;
}

.bar-track {
    height: 14px;
    background: rgba(255,255,255,0.08);
    border-radius: 999px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 999px;
    transition: width 1s ease;
}

.comparison {
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.comp-col.featured {
    border-top: 3px solid var(--primary);
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 1rem 0;
    color: var(--text-secondary);
}

.vs-badge {
    width: 60px;
    height: 60px;
    border-radius: 999px;
    border: 2px solid rgba(221, 75, 255, 0.35);
    color: var(--primary);
    font-weight: 800;
    display: grid;
    place-items: center;
    background: rgba(221, 75, 255, 0.06);
}

.video-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    backdrop-filter: blur(12px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-content {
    width: min(900px, 100%);
    position: relative;
}

.close-modal {
    position: absolute;
    top: -42px;
    right: 0;
    color: var(--text-main);
    font-size: 2rem;
    cursor: pointer;
}

.modal-video {
    width: 100%;
    border-radius: 1rem;
    display: block;
}

footer {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-main) 100%);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

footer p,
footer span {
    color: var(--text-secondary);
}

footer .logo-text h1 {
    color: var(--text-main);
}

/* Form Modal Styles */
.form-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.88);
    backdrop-filter: blur(12px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.form-modal.active {
    display: flex;
}

.form-modal-content {
    width: min(500px, 100%);
    position: relative;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 1.5rem;
    padding: 2.5rem;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}

.form-modal-header {
    text-align: center;
    margin-bottom: 2rem;
}

.form-modal-header h2 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-modal-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 0.75rem;
    color: var(--text-main);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 0.75rem;
    color: var(--text-main);
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
}

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

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

.form-group input:focus,
.form-group select:focus {
    outline: none;
    background: rgba(255,255,255,0.08);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(221, 75, 255, 0.1);
}

.form-modal-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.form-modal-footer a {
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.form-modal-footer a:hover {
    color: var(--primary-dark);
}

.form-error {
    color: #f97316;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    display: none;
}

.form-error.show {
    display: block;
}

.form-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
    padding: 1rem;
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    text-align: center;
    display: none;
}

.form-success.show {
    display: block;
}

@media (max-width: 1024px) {
    .hero-container,
    .realtime-grid,
    .comp-grid,
    .classes-wrapper {
        grid-template-columns: 1fr;
    }

    .workflow-steps {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-container,
    .hero-container,
    .realtime-grid,
    .classes-grid {
        gap: 1.5rem;
    }

    .nav-links {
        gap: 16px;
    }

    .header-actions {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    nav {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-main);
        flex-direction: column;
        gap: 16px;
        padding: 1.75rem 24px;
        border-top: 1px solid rgba(255,255,255,0.08);
        display: none;
    }

    nav.active {
        display: flex;
    }

    .nav-links {
        flex-wrap: wrap;
        gap: 14px;
        justify-content: center;
    }

    .hero {
        padding-top: 140px;
    }
}