/**
 * Industrial Crane Theme
 * ======================
 * Industrielle Hebezug-Atmosphäre für HENX3D
 *
 * Features:
 * - Stahl & Metall Ästhetik
 * - Nieten & Schweißnähte
 * - Warning Stripes
 * - Industrial Grid Background
 * - Rostiger Metallic-Look
 * - Hebezug-inspirierte UI
 *
 * @version 1.0.0
 * @created 2026-01-06
 */

:root {
    /* Colors - Industrial Steel */
    --crane-steel-darkest: #1a1d23;
    --crane-steel-dark: #2a2e35;
    --crane-steel-medium: #4a5568;
    --crane-steel-light: #6b7280;

    /* Rust & Warning Colors */
    --crane-rust-orange: #d97706;
    --crane-rust-dark: #92400e;
    --crane-warning-yellow: #fbbf24;
    --crane-warning-stripe: #f59e0b;

    /* Metallic Accents */
    --crane-rivet-silver: #9ca3af;
    --crane-chrome: #d1d5db;
    --crane-oil-black: #0f172a;
    --crane-weld-bright: #fef3c7;

    /* Neutral */
    --crane-white: #ffffff;
    --crane-off-white: #f3f4f6;

    /* Typography */
    --crane-font-heading: 'Exo 2', 'Industry', sans-serif;
    --crane-font-body: 'DM Sans', 'Arial', sans-serif;
    --crane-font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --crane-space-xs: 0.5rem;
    --crane-space-sm: 1rem;
    --crane-space-md: 1.5rem;
    --crane-space-lg: 2rem;
    --crane-space-xl: 3rem;

    /* Borders */
    --crane-border-width: 3px;
    --crane-border-color: var(--crane-steel-medium);
    --crane-border-radius: 2px;

    /* Shadows */
    --crane-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --crane-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --crane-shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --crane-inset-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);

    /* Gradients */
    --crane-gradient-steel: linear-gradient(135deg,
        var(--crane-steel-medium) 0%,
        var(--crane-steel-dark) 50%,
        var(--crane-steel-medium) 100%
    );
    --crane-gradient-rust: linear-gradient(135deg,
        var(--crane-rust-orange) 0%,
        var(--crane-rust-dark) 100%
    );

    /* Transitions */
    --crane-transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Standard CSS Variables for Compatibility */
    --color-bg: var(--crane-steel-darkest);
    --color-bg-elevated: var(--crane-steel-dark);
    --color-bg-subtle: var(--crane-oil-black);
    --color-bg-secondary: var(--crane-steel-dark);
    --color-bg-tertiary: var(--crane-steel-medium);
    --color-text: var(--crane-off-white);
    --color-text-muted: var(--crane-chrome);
    --color-text-subtle: var(--crane-rivet-silver);
    --color-primary: var(--crane-rust-orange);
    --color-primary-dark: var(--crane-rust-dark);
    --color-primary-light: var(--crane-warning-yellow);
    --color-border: var(--crane-steel-medium);
    --color-line: var(--crane-steel-light);
    --background-color: var(--crane-steel-darkest);
    --card-background: var(--crane-steel-dark);
    --input-background: var(--crane-steel-medium);
    --input-text: var(--crane-white);
    --text-color: var(--crane-off-white);
    --border-color: var(--crane-steel-medium);
    --card-bg: var(--crane-steel-dark);
    --input-bg: var(--crane-steel-medium);
    --input-border: var(--crane-steel-light);
    --button-text: var(--crane-steel-darkest);
    color-scheme: dark;
}

/* Industrial Steel Background */
body {
    font-family: var(--crane-font-body);
    color: var(--crane-off-white);
    background: var(--crane-steel-darkest);
    background-image:
        /* Vertical steel beams */
        repeating-linear-gradient(90deg,
            transparent 0px,
            transparent 99px,
            var(--crane-steel-medium) 99px,
            var(--crane-steel-medium) 100px
        ),
        /* Horizontal steel beams */
        repeating-linear-gradient(0deg,
            transparent 0px,
            transparent 99px,
            var(--crane-steel-medium) 99px,
            var(--crane-steel-medium) 100px
        ),
        /* Noise texture */
        linear-gradient(135deg,
            var(--crane-steel-darkest) 0%,
            var(--crane-steel-dark) 100%
        );
    background-size: 100px 100px, 100px 100px, 100% 100%;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--crane-font-heading);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--crane-white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

h1 { font-size: 4rem; }
h2 { font-size: 3rem; }
h3 { font-size: 2.25rem; }

.industrial-title {
    position: relative;
    color: var(--crane-warning-yellow);
    text-shadow:
        0 0 20px rgba(251, 191, 36, 0.6),
        2px 2px 4px rgba(0, 0, 0, 0.8);
    display: inline-block;
}

/* Warning stripe underline */
.industrial-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 6px;
    background: repeating-linear-gradient(
        45deg,
        var(--crane-warning-yellow) 0px,
        var(--crane-warning-yellow) 10px,
        var(--crane-oil-black) 10px,
        var(--crane-oil-black) 20px
    );
}

/* Buttons */
.btn-primary,
.btn-industrial {
    padding: var(--crane-space-sm) var(--crane-space-xl);
    font-family: var(--crane-font-heading);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--crane-oil-black);
    background: var(--crane-warning-yellow);
    border: 3px solid var(--crane-rust-dark);
    border-radius: var(--crane-border-radius);
    cursor: pointer;
    transition: all var(--crane-transition);
    box-shadow: var(--crane-shadow-md),
                inset 0 -3px 0 rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-industrial::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        45deg,
        transparent 0px,
        transparent 10px,
        rgba(0, 0, 0, 0.1) 10px,
        rgba(0, 0, 0, 0.1) 20px
    );
    transition: left 0.3s ease;
}

.btn-industrial:hover::before {
    left: 0;
}

.btn-industrial:hover {
    background: var(--crane-rust-orange);
    transform: translateY(-2px);
    box-shadow: var(--crane-shadow-lg),
                inset 0 -3px 0 rgba(0, 0, 0, 0.3);
}

.btn-industrial:active {
    transform: translateY(0);
    box-shadow: var(--crane-shadow-sm),
                inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn-secondary,
.btn-steel {
    padding: var(--crane-space-sm) var(--crane-space-xl);
    font-family: var(--crane-font-heading);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--crane-chrome);
    background: var(--crane-gradient-steel);
    border: 3px solid var(--crane-rivet-silver);
    border-radius: var(--crane-border-radius);
    cursor: pointer;
    transition: all var(--crane-transition);
    box-shadow: var(--crane-shadow-md);
}

.btn-steel:hover {
    background: var(--crane-steel-light);
    color: var(--crane-white);
    border-color: var(--crane-chrome);
}

/* Cards with Rivets */
.card,
.service-card,
.portfolio-card {
    position: relative;
    padding: var(--crane-space-lg);
    background: var(--crane-gradient-steel);
    border: 3px solid var(--crane-steel-medium);
    border-radius: var(--crane-border-radius);
    box-shadow: var(--crane-shadow-md),
                var(--crane-inset-shadow);
    transition: all var(--crane-transition);
    overflow: visible;
}

/* Rivets in corners */
.card::before,
.card::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: radial-gradient(circle,
        var(--crane-rivet-silver) 0%,
        var(--crane-steel-medium) 60%,
        var(--crane-steel-dark) 100%
    );
    border-radius: 50%;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

.card::before {
    top: 8px;
    left: 8px;
}

.card::after {
    top: 8px;
    right: 8px;
}

/* Bottom rivets via pseudo-element on child */
.card-header::before,
.card-header::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: radial-gradient(circle,
        var(--crane-rivet-silver) 0%,
        var(--crane-steel-medium) 60%,
        var(--crane-steel-dark) 100%
    );
    border-radius: 50%;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

.card-header::before {
    bottom: -16px;
    left: 8px;
}

.card-header::after {
    bottom: -16px;
    right: 8px;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--crane-shadow-lg),
                var(--crane-inset-shadow),
                0 0 30px rgba(251, 191, 36, 0.2);
    border-color: var(--crane-warning-yellow);
}

/* Weld seam effect on hover */
.card:hover::before {
    box-shadow: 0 0 8px var(--crane-weld-bright),
                inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Card Header */
.card-header {
    display: flex;
    align-items: center;
    gap: var(--crane-space-md);
    margin-bottom: var(--crane-space-md);
    padding-bottom: var(--crane-space-md);
    border-bottom: 3px solid var(--crane-steel-light);
    position: relative;
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--crane-warning-yellow);
    border: 3px solid var(--crane-rust-dark);
    border-radius: var(--crane-border-radius);
    box-shadow: var(--crane-shadow-sm);
    font-size: 2rem;
    color: var(--crane-oil-black);
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg,
        var(--crane-steel-darkest) 0%,
        var(--crane-steel-dark) 100%
    );
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 1200px;
    padding: var(--crane-space-xl) var(--crane-space-lg);
    z-index: 10;
}

.hero-tagline {
    font-family: var(--crane-font-mono);
    font-size: 1rem;
    color: var(--crane-warning-yellow);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--crane-space-md);
    padding: var(--crane-space-xs) var(--crane-space-md);
    background: repeating-linear-gradient(
        45deg,
        transparent 0px,
        transparent 10px,
        rgba(251, 191, 36, 0.1) 10px,
        rgba(251, 191, 36, 0.1) 20px
    );
    display: inline-block;
    border-left: 4px solid var(--crane-warning-yellow);
}

/* Grid Layout */
.industrial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--crane-space-xl);
    padding: var(--crane-space-xl) var(--crane-space-lg);
}

/* Navigation */
header.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(26, 29, 35, 0.95);
    border-bottom: 3px solid var(--crane-warning-yellow);
    box-shadow: var(--crane-shadow-lg);
    backdrop-filter: blur(10px);
    z-index: 100;
}

.nav-link {
    padding: var(--crane-space-sm) var(--crane-space-md);
    color: var(--crane-off-white);
    font-family: var(--crane-font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    transition: all var(--crane-transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--crane-warning-yellow);
    transition: all var(--crane-transition);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--crane-warning-yellow);
}

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

/* Section Divider - Steel Beam */
.section-divider {
    width: 100%;
    height: 6px;
    background: var(--crane-gradient-steel);
    margin: var(--crane-space-xl) 0;
    box-shadow: var(--crane-inset-shadow);
    position: relative;
}

/* Rivets on divider */
.section-divider::before,
.section-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background: radial-gradient(circle,
        var(--crane-rivet-silver) 0%,
        var(--crane-steel-medium) 60%,
        var(--crane-steel-dark) 100%
    );
    border-radius: 50%;
    transform: translateY(-50%);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

.section-divider::before {
    left: 20px;
}

.section-divider::after {
    right: 20px;
}

/* Forms */
.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--crane-space-sm) var(--crane-space-md);
    font-family: var(--crane-font-body);
    color: var(--crane-white);
    background: var(--crane-steel-dark);
    border: 3px solid var(--crane-steel-medium);
    border-radius: var(--crane-border-radius);
    transition: all var(--crane-transition);
    box-shadow: var(--crane-inset-shadow);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--crane-warning-yellow);
    box-shadow: 0 0 0 3px rgba(251, 191, 36, 0.3),
                var(--crane-inset-shadow);
}

/* Stats - Industrial Gauge Style */
.stat-number {
    font-family: var(--crane-font-heading);
    font-size: 4rem;
    font-weight: 700;
    color: var(--crane-warning-yellow);
    text-shadow:
        0 0 20px rgba(251, 191, 36, 0.6),
        2px 2px 4px rgba(0, 0, 0, 0.8);
}

.stat-label {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--crane-chrome);
}

/* Footer */
.site-footer {
    background: var(--crane-steel-darkest);
    border-top: 3px solid var(--crane-warning-yellow);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.3);
}

/* Utilities */
.text-warning { color: var(--crane-warning-yellow); }
.text-steel { color: var(--crane-chrome); }
.text-rust { color: var(--crane-rust-orange); }
.bg-steel { background: var(--crane-gradient-steel); }
.border-warning { border-color: var(--crane-warning-yellow); }

/* Chain container for JS animations */
#crane-chains-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Conveyor belt container */
#conveyor-belt-container {
    position: relative;
    overflow: hidden;
}

/* Gears container */
#gears-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.15;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }

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

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