/* ===== CSS Variables ===== */
:root {
    --color-bg: #050508;
    --color-bg-secondary: #0a0d14;
    --color-bg-card: rgba(15, 20, 30, 0.6);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-text: #ffffff;
    --color-text-muted: rgba(255, 255, 255, 0.6);
    --color-teal: #00B4D8;
    --color-cyan: #00E5FF;
    --color-purple: #8B5CF6;
    --gradient-primary: linear-gradient(135deg, var(--color-teal) 0%, var(--color-cyan) 50%, var(--color-purple) 100%);
    --gradient-text: linear-gradient(90deg, var(--color-cyan) 0%, var(--color-purple) 100%);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-logo: 'Orbitron', sans-serif;
    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Grid background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

/* ===== Typography ===== */
h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #007a94 0%, #0097a7 50%, #6d45c9 100%);
    color: white;
    position: relative;
    z-index: 1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-cyan) 50%, var(--color-purple) 100%);
    filter: blur(15px);
    opacity: 0.4;
    z-index: -1;
    border-radius: inherit;
    transition: opacity 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-primary:hover::before {
    opacity: 0.8;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    background: rgba(5, 5, 8, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-logo);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ===== Hero Section ===== */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    padding: calc(80px + var(--spacing-lg)) var(--spacing-lg) var(--spacing-xl);
    position: relative;
    gap: var(--spacing-lg);
    max-width: var(--container-width);
    margin: 0 auto;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 181, 216, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    flex: 1;
    max-width: 550px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-sm);
    line-height: 1.15;
}

.hero-badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid var(--color-cyan);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-cyan);
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Video Animation */
.video-animation {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.source-video {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.video-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: white;
}

.video-icon svg {
    width: 40px;
    height: 40px;
}

.source-video span {
    font-weight: 600;
    color: var(--color-text-muted);
}

.arrow-flow {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.arrow {
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
    position: relative;
    animation: arrowPulse 1.5s ease-in-out infinite;
}

.arrow:nth-child(2) { animation-delay: 0.2s; }
.arrow:nth-child(3) { animation-delay: 0.4s; }

.arrow::after {
    content: '';
    position: absolute;
    right: -6px;
    top: -4px;
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 8px solid var(--color-purple);
}

@keyframes arrowPulse {
    0%, 100% { opacity: 0.3; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(5px); }
}

.output-videos {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mini-video {
    padding: 0.5rem 1rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-cyan);
    backdrop-filter: blur(10px);
    animation: fadeSlideIn 0.5s ease-out backwards;
    animation-delay: var(--delay);
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== Problem Section ===== */
.problem {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.problem-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.problem-stat {
    font-size: 3rem;
    font-weight: 700;
    color: #ef4444;
    margin-bottom: var(--spacing-xs);
}

.problem-card p {
    color: var(--color-text-muted);
    font-size: 1rem;
}

.problem-card strong {
    color: var(--color-text);
}

.problem-callout {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
    padding: var(--spacing-lg);
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
}

/* ===== How It Works ===== */
.how-it-works {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
    position: relative;
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 250px;
    max-width: 320px;
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    position: relative;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    border-color: var(--color-teal);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}

.step-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-cyan);
}

.step-icon svg {
    width: 100%;
    height: 100%;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

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

.step-connector {
    display: none;
}

/* ===== Comparison Section ===== */
.comparison {
    padding: var(--spacing-2xl) 0;
}

.comparison-table {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.comparison-column {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.voxrefine-column {
    background: linear-gradient(135deg, rgba(0, 181, 216, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid var(--color-teal);
}

.avatar-column {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.column-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    font-size: 1.25rem;
    font-weight: 700;
}

.comparison-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.avatar-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-text-muted);
}

.comparison-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.comparison-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.95rem;
}

.check-icon {
    width: 20px;
    height: 20px;
    color: var(--color-cyan);
    flex-shrink: 0;
}

.x-icon {
    width: 20px;
    height: 20px;
    color: #ef4444;
    flex-shrink: 0;
}

/* ===== Use Cases Section ===== */
.use-cases {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

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

.use-case-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.use-case-card:hover {
    border-color: var(--color-teal);
    transform: translateY(-3px);
}

.use-case-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-cyan);
}

.use-case-icon svg {
    width: 100%;
    height: 100%;
}

.use-case-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.use-case-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-style: italic;
    line-height: 1.6;
}

/* ===== FAQ Section ===== */
.faq {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.3s ease;
}

.faq-item:hover {
    border-color: var(--color-teal);
}

.faq-item.active {
    border-color: var(--color-teal);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--color-cyan);
}

.faq-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.contact-form {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
}

.optional {
    color: var(--color-text-muted);
    font-weight: 400;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease, background 0.3s ease;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-teal);
    background: rgba(255, 255, 255, 0.08);
}

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

.contact-form .btn {
    width: 100%;
    margin-top: var(--spacing-sm);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-logo img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.footer-logo span {
    font-family: var(--font-logo);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-divider {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.fairline-link {
    color: var(--color-cyan);
    font-weight: 500;
    transition: color 0.3s ease;
}

.fairline-link:hover {
    color: var(--color-purple);
}

.copyright {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ===== 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);
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: calc(80px + var(--spacing-md));
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        margin-top: var(--spacing-md);
    }

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

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

    .video-animation {
        flex-direction: column;
    }

    .arrow-flow {
        flex-direction: row;
        transform: rotate(90deg);
    }

    .comparison-table {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
        align-items: center;
    }

    .step {
        max-width: 100%;
    }

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

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

    .nav .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: center;
    }

    .stat {
        align-items: center;
    }

    .problem-stat {
        font-size: 2.5rem;
    }

    .output-videos {
        font-size: 0.7rem;
    }

    .mini-video {
        padding: 0.375rem 0.5rem;
    }

    .comparison-list li {
        font-size: 0.85rem;
        align-items: flex-start;
    }
}