/* Design Tokens */
:root {
    --color-navy: #1e2d3d;
    --color-dark-bg: #2a3744;
    --color-darker: #1a2332;
    --color-cyan: #1fb8cd;
    --color-cyan-hover: #17a3b8;
    --color-gold: #d4a857;
    --color-gold-hover: #c49847;
    --color-beige: #f5f1e8;
    --color-white: #ffffff;
    --color-gray: #8892a0;
    
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.35);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-darker);
    color: var(--color-beige);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 35, 50, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(31, 184, 205, 0.2);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    height: 60px;
    width: auto;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--color-beige);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-cyan);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-cyan);
}

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

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 100px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-darker) 50%, var(--color-dark-bg) 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(31, 184, 205, 0.15) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.text-gold {
    color: var(--color-gold);
    text-shadow: 0 0 40px rgba(212, 168, 87, 0.5);
}

.text-cyan {
    color: var(--color-cyan);
    text-shadow: 0 0 40px rgba(31, 184, 205, 0.5);
}

.hero-subtitle {
    font-size: clamp(18px, 2vw, 24px);
    color: var(--color-gray);
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--color-cyan);
    color: var(--color-darker);
    box-shadow: 0 4px 16px rgba(31, 184, 205, 0.4);
}

.btn-primary:hover {
    background: var(--color-cyan-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(31, 184, 205, 0.6);
}

.btn-large {
    padding: 18px 48px;
    font-size: 18px;
}

.icon {
    width: 20px;
    height: 20px;
}

/* Sections */
.section {
    padding: 100px 0;
    position: relative;
}

.section-dark {
    background: var(--color-dark-bg);
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    text-align: center;
    margin-bottom: 64px;
    color: var(--color-gold);
    text-shadow: 0 0 30px rgba(212, 168, 87, 0.3);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.skill-card {
    background: var(--color-navy);
    border: 1px solid rgba(31, 184, 205, 0.3);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-cyan), var(--color-gold));
    transform: scaleX(0);
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-cyan);
}

.skill-card:hover::before {
    transform: scaleX(1);
}

.skill-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.skill-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-cyan);
    margin-bottom: 8px;
}

.skill-level {
    color: var(--color-gray);
    font-size: 14px;
}

/* Cases Grid */
.cases-grid {
    display: grid;
    gap: 48px;
}

.case-card {
    background: var(--color-navy);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(31, 184, 205, 0.2);
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-cyan);
}

.case-header {
    position: relative;
    height: 300px;
    overflow: hidden;
    background: var(--color-darker);
}

.case-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: var(--transition);
}

.case-card:hover .case-image {
    transform: scale(1.05);
}

.case-body {
    padding: 32px;
}

.case-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-gold);
    margin-bottom: 16px;
}

.case-description {
    color: var(--color-beige);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.case-result {
    color: var(--color-cyan);
    font-weight: 600;
    font-size: 16px;
    padding: 16px;
    background: rgba(31, 184, 205, 0.1);
    border-left: 4px solid var(--color-cyan);
    border-radius: 4px;
}

/* Collaboration Section */
.collaboration-card {
    background: var(--color-navy);
    border-radius: 16px;
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(212, 168, 87, 0.3);
    text-align: center;
}

.collaboration-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-beige);
    margin-bottom: 24px;
}

.collaboration-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.collab-link {
    color: var(--color-cyan);
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    transition: var(--transition);
}

.collab-link:hover {
    color: var(--color-gold);
    text-decoration: underline;
}

/* Prompt Section */
.prompt-card {
    background: var(--color-navy);
    border-radius: 16px;
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(31, 184, 205, 0.3);
}

.prompt-intro {
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-beige);
    margin-bottom: 24px;
    text-align: center;
}

.code-block {
    position: relative;
    background: var(--color-darker);
    border-radius: 8px;
    padding: 24px;
    overflow-x: auto;
}

.copy-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--color-cyan);
    color: var(--color-darker);
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.copy-btn:hover {
    background: var(--color-cyan-hover);
    transform: translateY(-2px);
}

.code-block pre {
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-beige);
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Contact Section */
.contact-card {
    background: var(--color-navy);
    border-radius: 16px;
    padding: 64px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(31, 184, 205, 0.3);
}

.contact-text {
    font-size: 20px;
    color: var(--color-beige);
    margin-bottom: 32px;
}

/* Footer */
.footer {
    background: var(--color-darker);
    border-top: 1px solid rgba(31, 184, 205, 0.2);
    padding: 32px 0;
    text-align: center;
    color: var(--color-gray);
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        gap: 16px;
    }
    
    .nav-link {
        font-size: 14px;
    }
    
    .logo {
        height: 50px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .case-header {
        height: 200px;
    }
    
    .collaboration-card,
    .prompt-card,
    .contact-card {
        padding: 32px 24px;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
}



/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-left: 24px;
}

.lang-flag {
    background: transparent;
    border: 2px solid rgba(31, 184, 205, 0.3);
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.lang-flag:hover {
    border-color: var(--color-cyan);
    transform: scale(1.1);
    box-shadow: 0 0 12px rgba(31, 184, 205, 0.4);
}

.lang-flag.active {
    border-color: var(--color-gold);
    background: rgba(212, 168, 87, 0.1);
    box-shadow: 0 0 16px rgba(212, 168, 87, 0.5);
}