:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    transition: all 0.3s ease;
}

.container {
    max-width: 800px;
    width: 100%;
    background: var(--bg-primary);
    border-radius: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s ease;
}

.header {
    background: var(--primary-gradient);
    color: white;
    text-align: center;
    padding: 3rem 2rem 2rem;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-20px, -20px) rotate(360deg); }
}

.header h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.main-content {
    padding: 3rem 2rem;
}

.input-section {
    margin-bottom: 2rem;
}

.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.slang-input {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    outline: none;
}

.slang-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.analyze-btn {
    width: 100%;
    padding: 1.2rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.analyze-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.analyze-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.analyze-btn:hover::before {
    left: 100%;
}

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

.results {
    display: none;
    margin-top: 2rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 15px;
    border: 2px solid var(--border-color);
}

.results.show {
    display: block;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.age-meter {
    text-align: center;
    margin-bottom: 2rem;
}

.age-meter h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.emoji-scale {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 12px;
    position: relative;
}

.emoji {
    font-size: 2rem;
    transition: all 0.3s ease;
}

.emoji.active {
    transform: scale(1.5);
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
}

.meter-pointer {
    position: absolute;
    top: -10px;
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 15px solid #667eea;
    transition: all 0.5s ease;
}

.diagnosis {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid #667eea;
    margin-bottom: 1.5rem;
}

.diagnosis h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.slang-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.slang-category {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.category-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-current {
    border-left-color: var(--success-color);
}

.category-outdated {
    border-left-color: var(--danger-color);
}

.category-unknown {
    border-left-color: var(--warning-color);
}

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

.slang-list li {
    padding: 0.3rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.share-section {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
}

.share-btn {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 0 0.5rem;
}

.share-btn:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.examples {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.examples h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.example-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.example-tag {
    background: #667eea;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.example-tag:hover {
    background: #5a67d8;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .header {
        padding: 2rem 1rem 1.5rem;
    }

    .main-content {
        padding: 2rem 1rem;
    }

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

    .emoji-scale {
        padding: 0.5rem;
    }

    .emoji {
        font-size: 1.5rem;
    }

    .share-btn {
        display: block;
        width: 100%;
        margin: 0.5rem 0;
    }
}