/* ============================================
   AXION Robotics — Design System
   Dark Theme + Glassmorphism + Glow Effects
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&family=DM+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
    --bg-primary: #080C10;
    --bg-secondary: #12121A;
    --bg-card: rgba(18, 18, 26, 0.6);
    --accent-cyan: #00D4FF;
    --accent-purple: #7C3AED;
    --accent-green: #10B981;
    --accent-red: #FF4D4D;
    --text-primary: #F0F0F5;
    --text-secondary: #8B8B9E;
    --border-color: #1E1E2E;
    --font-logo: 'Bebas Neue', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'DM Mono', monospace;
    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
    --glow-cyan-strong: 0 0 40px rgba(0, 212, 255, 0.5);
    --glass-bg: rgba(18, 18, 26, 0.4);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-blur: blur(20px);
    --section-padding: 100px 0;
    --container-max: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

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

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.125rem; }

.text-gradient {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-cyan { color: var(--accent-cyan); }
.text-muted { color: var(--text-secondary); }
.font-mono { font-family: var(--font-mono); }

/* --- Grid Background --- */
.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(8, 12, 16, 0.9);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    padding: 12px 0;
}

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

.navbar-logo {
    font-family: var(--font-logo);
    font-size: 1.75rem;
    letter-spacing: 3px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 2px;
}

.navbar-logo .dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: var(--glow-cyan);
    margin-left: 2px;
}

.navbar-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.navbar-links a {
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.3s;
}

.navbar-links a:hover,
.navbar-links a.active {
    color: var(--accent-cyan);
    opacity: 1;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 5px 0;
    transition: all 0.3s;
}

.mobile-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.open span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: 120px 24px 80px;
}

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

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    border: 1px solid rgba(0, 212, 255, 0.3);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero h1 {
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

/* --- Demo Countdown --- */
.countdown-wrapper {
    margin-top: 48px;
    padding: 24px 32px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(0, 212, 255, 0.15);
    border-radius: 16px;
    display: inline-block;
}

.countdown-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 3px;
    color: var(--accent-cyan);
    margin-bottom: 4px;
}

.countdown-date {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.countdown-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.countdown-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 56px;
}

.countdown-num {
    font-family: var(--font-mono);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1;
}

.countdown-text {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 4px;
}

.countdown-sep {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--accent-cyan);
    opacity: 0.5;
    margin-bottom: 16px;
}

.countdown-done {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--accent-cyan);
}

/* --- Ambient glow behind hero --- */
.hero::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-transform: uppercase;
}

.btn-primary {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
    background: #33DDFF;
    box-shadow: var(--glow-cyan-strong);
    transform: translateY(-2px);
    color: var(--bg-primary);
    opacity: 1;
}

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

.btn-outline:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    opacity: 1;
}

/* ============================================
   SECTIONS
   ============================================ */
section {
    position: relative;
    z-index: 1;
}

.section {
    padding: var(--section-padding);
}

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

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 16px auto 0;
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

/* ============================================
   GLASS CARD
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s ease;
}

.glass-card:hover {
    border-color: rgba(0, 212, 255, 0.15);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ============================================
   STAT CARDS (Problem Section)
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.stat-card {
    text-align: center;
    padding: 40px 24px;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--accent-cyan);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ============================================
   SOLUTION CARDS (3-Column)
   ============================================ */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    text-align: center;
    padding: 48px 24px;
}

.solution-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.solution-card h3 {
    margin-bottom: 12px;
}

.solution-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.solution-flow {
    text-align: center;
    margin-top: 48px;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--accent-cyan);
    letter-spacing: 2px;
}

/* ============================================
   DIFFERENTIATOR GRID (4 items)
   ============================================ */
.diff-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.diff-card {
    padding: 32px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.diff-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

.diff-card h4 {
    margin-bottom: 8px;
}

.diff-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-vision-quote {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--accent-cyan);
    border-left: 3px solid var(--accent-cyan);
    padding-left: 24px;
    margin-bottom: 24px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-founder {
    padding: 32px;
}

.founder-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 4px;
}

.founder-role {
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.founder-bio {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ============================================
   NEWSLETTER SECTION
   ============================================ */
.newsletter {
    text-align: center;
    padding: 80px 0;
}

.newsletter-form {
    display: flex;
    gap: 12px;
    max-width: 480px;
    margin: 32px auto 0;
}

.newsletter-form input {
    flex: 1;
    padding: 14px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}

.newsletter-form input::placeholder {
    color: var(--text-secondary);
}

.newsletter-form input:focus {
    border-color: var(--accent-cyan);
}

.newsletter-message {
    margin-top: 12px;
    font-size: 0.85rem;
    min-height: 20px;
}

.newsletter-message.success { color: var(--accent-green); }
.newsletter-message.error { color: var(--accent-red); }

/* ============================================
   FOOTER
   ============================================ */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 48px 0 32px;
    position: relative;
    z-index: 1;
}

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

.footer-logo {
    font-family: var(--font-logo);
    font-size: 1.5rem;
    letter-spacing: 3px;
    color: var(--text-primary);
}

.footer-logo .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: var(--glow-cyan);
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent-cyan);
    opacity: 1;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: color 0.3s;
}

.footer-social a:hover {
    color: var(--accent-cyan);
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* ============================================
   TECHNOLOGY PAGE
   ============================================ */
.page-hero {
    padding: 160px 0 80px;
    text-align: center;
}

.page-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 16px auto 0;
}

/* VLA Problem */
.vla-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-top: 40px;
}

.vla-can, .vla-cannot {
    padding: 32px;
}

.vla-can h4, .vla-cannot h4 {
    margin-bottom: 16px;
    font-size: 1rem;
}

.vla-can h4 { color: var(--accent-green); }
.vla-cannot h4 { color: var(--accent-red); }

.vla-list {
    list-style: none;
}

.vla-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.vla-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.vla-can .vla-list li::before { background: var(--accent-green); }
.vla-cannot .vla-list li::before { background: var(--accent-red); }

.vla-quote {
    text-align: center;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 40px;
    padding: 24px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

/* Pipeline Section */
.pipeline-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 40px;
}

.pipeline-step {
    padding: 20px;
    text-align: center;
    position: relative;
}

.pipeline-step .step-num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    margin-bottom: 8px;
}

.pipeline-step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.pipeline-step.manual {
    border-color: rgba(255, 77, 77, 0.3);
}

.pipeline-step.manual .step-num {
    color: var(--accent-red);
}

.pipeline-badge {
    text-align: center;
    margin-top: 32px;
}

.pipeline-badge span {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 8px 24px;
    border-radius: 20px;
}

/* Architecture Section */
.arch-layers {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.arch-layer {
    padding: 32px;
    text-align: center;
}

.arch-layer .layer-freq {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    margin-bottom: 12px;
}

.arch-layer h3 {
    margin-bottom: 12px;
}

.arch-layer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Skill Anatomy */
.skill-tree {
    max-width: 600px;
    margin: 40px auto 0;
    padding: 32px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 2;
    color: var(--text-secondary);
}

.skill-tree .tree-header {
    color: var(--accent-cyan);
    font-weight: 500;
}

/* Research Section */
.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.research-card {
    padding: 32px;
    text-align: center;
}

.research-card h4 {
    margin-bottom: 8px;
    color: var(--accent-cyan);
}

.research-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    margin-top: 40px;
}

.contact-form {
    padding: 40px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238B8B9E' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    cursor: pointer;
}

.form-group select option {
    background: var(--bg-secondary);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-message {
    margin-top: 16px;
    font-size: 0.85rem;
    min-height: 20px;
}

.form-message.success { color: var(--accent-green); }
.form-message.error { color: var(--accent-red); }

/* Contact Sidebar */
.contact-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-card {
    padding: 28px;
}

.sidebar-card h4 {
    margin-bottom: 12px;
    color: var(--accent-cyan);
}

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

.sidebar-card a {
    display: inline-block;
    margin-top: 8px;
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .diff-grid { grid-template-columns: 1fr; }
    .pipeline-steps { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }

    .navbar-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(8, 12, 16, 0.95);
        backdrop-filter: var(--glass-blur);
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }

    .navbar-links.open {
        display: flex;
    }

    .mobile-toggle {
        display: block;
    }

    .stats-grid { grid-template-columns: 1fr; }
    .solution-grid { grid-template-columns: 1fr; }
    .about-content { grid-template-columns: 1fr; gap: 32px; }
    .vla-columns { grid-template-columns: 1fr; }
    .pipeline-steps { grid-template-columns: repeat(2, 1fr); }
    .arch-layers { grid-template-columns: 1fr; }
    .research-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }

    .hero { padding: 120px 24px 60px; }
    .page-hero { padding: 120px 0 60px; }

    .newsletter-form {
        flex-direction: column;
    }

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

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}