/* CSS Variables */
:root {
    --bg-primary: #0a0f1c;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent: #10b981;
    --accent-glow: rgba(16, 185, 129, 0.3);
    --accent-secondary: #06d6a0;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --font-main: 'Zen Kaku Gothic New', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Pattern */
.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(6, 214, 160, 0.06) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.background-pattern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(10, 15, 28, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-shadow: 0 0 20px var(--accent-glow);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

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

/* Main Content */
main {
    padding-top: 80px;
}

/* Hero Section */
.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.accent {
    color: var(--accent);
    text-shadow: 0 0 40px var(--accent-glow);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--accent);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent);
}

.pulse {
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 var(--accent-glow);
    }
    50% {
        box-shadow: 0 0 0 12px transparent;
    }
}

/* Features Section */
.features {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.features h2,
.test-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.6s ease-out backwards;
}

.feature-card[data-delay="0"] { animation-delay: 0s; }
.feature-card[data-delay="100"] { animation-delay: 0.1s; }
.feature-card[data-delay="200"] { animation-delay: 0.2s; }
.feature-card[data-delay="300"] { animation-delay: 0.3s; }

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(16, 185, 129, 0.15);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.status {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.status.success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent);
}

/* Test Section */
.test-section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.test-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.test-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
}

.test-box h3 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--accent);
}

/* Counter */
.counter {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.counter-value {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 600;
    color: var(--accent);
    min-width: 80px;
}

/* Buttons */
.btn {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 1.25rem;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    background: var(--accent);
    color: var(--bg-primary);
    transform: scale(1.05);
}

.btn:active {
    transform: scale(0.95);
}

.btn-color {
    width: auto;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    margin-bottom: 1rem;
}

/* Input */
#testInput {
    width: 100%;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

#testInput:focus {
    border-color: var(--accent);
}

#testInput::placeholder {
    color: var(--text-secondary);
}

.input-mirror {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-height: 50px;
    word-break: break-all;
}

/* Color Box */
.color-box {
    width: 100%;
    height: 80px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    transition: background 0.5s ease;
}

/* Info Section */
.info-section {
    padding: 4rem 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
}

.info-card h3 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

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

.info-list li {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.info-list li:last-child {
    border-bottom: none;
}

.info-list li span:first-child {
    color: var(--text-secondary);
}

.info-list li span:last-child {
    font-family: var(--font-mono);
    color: var(--accent);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero {
        min-height: auto;
        padding: 4rem 1rem;
    }

    .features,
    .test-section,
    .info-section {
        padding: 2rem 1rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

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