/*
 * Stonedrum - Visual Design System
 * Theme: "Future meets History" - Futuristic Tech + Classical Elegance
 */

/* ============================================
   1. CSS RESET & BASE
   ============================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
    line-height: 1.6;
    color: #E5E7EB;
    background-color: #050505;
    overflow-x: hidden;
}

/* ============================================
   2. CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
    /* Colors */
    --color-canvas: #050505;
    --color-canvas-light: #0a0a0a;
    --color-text-primary: #E5E7EB;
    --color-text-secondary: #9CA3AF;
    --color-accent-cyan: #00F0FF;
    --color-accent-violet: #7000FF;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-accent: 'Libre Baskerville', serif;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

/* Serif accent for cultural words */
.serif-accent {
    font-family: var(--font-accent);
    font-style: italic;
}

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

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

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

/* ============================================
   4. LAYOUT UTILITIES
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

section {
    padding: var(--space-xl) 0;
    position: relative;
}

/* ============================================
   5. CANVAS CONTAINER (Three.js Background)
   ============================================ */
#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ============================================
   6. NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-medium);
}

.navbar.scrolled {
    padding: var(--space-xs) 0;
    background: rgba(5, 5, 5, 0.9);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
}

.logo span {
    color: var(--color-accent-cyan);
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent-cyan), var(--color-accent-violet));
    transition: var(--transition-medium);
}

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

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

.lang-toggle {
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent-cyan) !important;
    transition: var(--transition-fast);
}

.lang-toggle:hover {
    background: var(--glass-bg);
    border-color: var(--color-accent-cyan);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-fast);
}

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

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero h1 {
    margin-bottom: var(--space-md);
    text-align: center;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-lg);
    line-height: 1.8;
    text-align: center;
}

.hero-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   8. BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-medium);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-violet));
    color: var(--color-canvas);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.4);
    color: var(--color-canvas);
}

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

.btn-outline::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--radius-full);
    padding: 1px;
    background: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-violet));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: var(--transition-medium);
}

.btn-outline:hover {
    border-color: transparent;
    color: var(--color-text-primary);
}

.btn-outline:hover::before {
    opacity: 1;
}

/* ============================================
   9. TECHNOLOGY SECTION
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header h2 {
    margin-bottom: var(--space-sm);
}

.section-header p {
    max-width: 600px;
    margin: 0 auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.tech-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
    transition: var(--transition-medium);
}

.tech-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-cyan);
    box-shadow: 0 10px 40px rgba(0, 240, 255, 0.1);
}

.tech-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(112, 0, 255, 0.1));
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
}

.tech-icon svg {
    width: 40px;
    height: 40px;
    stroke: var(--color-accent-cyan);
    stroke-width: 1.5;
    fill: none;
}

.tech-card h3 {
    margin-bottom: var(--space-sm);
}

.tech-card p {
    font-size: 0.95rem;
}

/* ============================================
   10. SOLUTIONS SECTION
   ============================================ */
.solutions-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.solution-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: center;
}

.solution-item:nth-child(even) {
    direction: rtl;
}

.solution-item:nth-child(even)>* {
    direction: ltr;
}

.solution-content h3 {
    margin-bottom: var(--space-sm);
}

.solution-content p {
    font-size: 1rem;
    line-height: 1.8;
}

.solution-visual {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: var(--transition-medium);
}

.solution-visual:hover {
    border-color: var(--color-accent-cyan);
    box-shadow: 0 10px 40px rgba(0, 240, 255, 0.1);
}

.solution-visual svg {
    width: 120px;
    height: 120px;
    stroke: var(--color-accent-cyan);
    stroke-width: 1;
    fill: none;
    opacity: 0.5;
}

/* ============================================
   11. CONTACT / FOOTER
   ============================================ */
.contact {
    background: var(--color-canvas-light);
    border-top: 1px solid var(--glass-border);
}

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-lg);
}

.contact-info h3 {
    margin-bottom: var(--space-sm);
}

.contact-info p {
    margin-bottom: var(--space-md);
}

.contact-links h4,
.contact-locations h4 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.contact-links ul,
.contact-locations ul {
    list-style: none;
}

.contact-links li,
.contact-locations li {
    margin-bottom: var(--space-xs);
}

.contact-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.contact-links a:hover {
    color: var(--color-accent-cyan);
}

.contact-locations li {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.footer-bottom {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* ============================================
   12. ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation delays */
.tech-card:nth-child(1) {
    transition-delay: 0.1s;
}

.tech-card:nth-child(2) {
    transition-delay: 0.2s;
}

.tech-card:nth-child(3) {
    transition-delay: 0.3s;
}

.solution-item:nth-child(1) {
    transition-delay: 0.1s;
}

.solution-item:nth-child(2) {
    transition-delay: 0.2s;
}

.solution-item:nth-child(3) {
    transition-delay: 0.3s;
}

/* ============================================
   13. RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    .solution-item {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .solution-item:nth-child(even) {
        direction: ltr;
    }

    .solution-visual {
        max-width: 500px;
        margin: 0 auto;
    }

    .contact-content {
        grid-template-columns: 1fr 1fr;
    }

    .contact-info {
        grid-column: 1 / -1;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --space-lg: 3rem;
        --space-xl: 4rem;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(5, 5, 5, 0.98);
        backdrop-filter: var(--glass-blur);
        -webkit-backdrop-filter: var(--glass-blur);
        padding: var(--space-md);
        gap: var(--space-sm);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-medium);
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

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

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

    .hero {
        padding: 100px var(--space-sm) var(--space-lg);
    }

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

    .contact-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.9rem;
    }
}