:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --border-color: rgba(255, 255, 255, 0.1);
    --success: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    margin-bottom: 1rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.settings-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.settings-bar label {
    font-weight: 500;
    color: var(--text-muted);
}

.dropdown {
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.dropdown:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.dropdown option {
    background: var(--bg-color);
    color: var(--text-main);
}

.workspace {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: stretch;
}

@media (min-width: 768px) {
    .workspace {
        flex-direction: row;
        align-items: stretch;
    }
}

.panel {
    flex: 1;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.panel label {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

textarea {
    flex: 1;
    min-height: 300px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-main);
    font-family: 'Inter', monospace;
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea::placeholder {
    color: rgba(148, 163, 184, 0.5);
}

.action-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

@media (min-width: 768px) {
    .action-center {
        padding: 0 1rem;
    }
}

.primary-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.primary-btn:active {
    transform: scale(0.98);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.secondary-btn.copied {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.count-badge {
    font-size: 0.85rem;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    color: var(--text-muted);
}

.output-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-footer {
    text-align: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.app-footer p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.app-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.app-footer a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}