:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --success: #3fb950;
    --border: #30363d;
    --shadow: rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Language Switch */
.language-switch {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 10px;
    background: var(--bg-secondary);
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.lang-btn.active {
    background: var(--accent);
    color: #fff;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.hero-content h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glitch {
    position: relative;
    animation: glitch-text 5s infinite;
}

@keyframes glitch-text {
    0%, 90%, 100% {
        transform: translate(0);
    }
    92% {
        transform: translate(-2px, 2px);
    }
    94% {
        transform: translate(2px, -2px);
    }
    96% {
        transform: translate(-2px, -2px);
    }
}

.subtitle {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.tagline {
    font-size: clamp(1rem, 2.5vw, 1.4rem);
    color: var(--text-secondary);
    margin-top: 20px;
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    opacity: 0;
    transform: translateY(50px);
    animation: slideUp 0.8s ease forwards;
}

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

/* Sections */
section {
    margin: 100px 0;
}

section h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
}

/* About Section */
.about-content p {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 800px;
    line-height: 1.8;
    margin-bottom: 20px;
}

/* Timeline Section */
.timeline-container {
    position: relative;
    max-width: 900px;
    margin: 50px auto 0;
    padding-left: 40px;
}

.timeline-container::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-hover) 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    opacity: 0;
    transform: translateX(-30px);
    animation: slideInTimeline 0.6s ease forwards;
}

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }

@keyframes slideInTimeline {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.timeline-marker {
    position: absolute;
    left: -33px;
    top: 8px;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--bg-secondary);
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
    box-shadow: 0 0 0 6px var(--bg-secondary), 0 0 20px var(--accent);
}

.timeline-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
}

.timeline-content:hover {
    border-color: var(--accent);
    box-shadow: 0 10px 30px var(--shadow);
    transform: translateX(5px);
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: 0 20px 40px var(--shadow);
}

.card:hover::before {
    opacity: 0.05;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    filter: grayscale(0.3);
    transition: all 0.4s ease;
}

.card:hover .card-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Tech Stack */
.tech-category {
    margin-bottom: 40px;
}

.tech-category h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.tech-tag {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--accent);
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.3s ease;
    cursor: default;
}

.tech-tag:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(88, 166, 255, 0.3);
}

/* Donate Section */
.donate-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.crypto-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.crypto-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.crypto-item:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px var(--shadow);
}

.crypto-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.crypto-name {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--accent);
}

.copy-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(88, 166, 255, 0.4);
}

.copy-btn:active {
    transform: translateY(0);
}

.copy-icon {
    font-size: 1rem;
}

.crypto-address {
    display: block;
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: 8px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    word-break: break-all;
    border: 1px solid var(--border);
}

/* Notification */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: var(--success);
    color: #fff;
    padding: 16px 24px;
    border-radius: 12px;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(63, 185, 80, 0.4);
    transform: translateX(400px);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 100px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    .hero {
        min-height: 60vh;
    }

    section {
        margin: 60px 0;
    }

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

    .language-switch {
        top: 10px;
        right: 10px;
    }

    .crypto-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .copy-btn {
        align-self: stretch;
        justify-content: center;
    }

    /* Timeline responsive */
    .timeline-container {
        padding-left: 30px;
    }

    .timeline-container::before {
        left: 8px;
    }

    .timeline-marker {
        left: -25px;
        width: 12px;
        height: 12px;
    }

    .timeline-content {
        padding: 20px;
    }

    .timeline-content h3 {
        font-size: 1.2rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--accent);
    color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 6px;
    border: 3px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border);
}