:root {
    --bg-dark: #0a0d14;
    --bg-card: #121824;
    --bg-card-hover: #192233;
    --border-color: #232f48;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-glow: radial-gradient(circle at 50% 0%, rgba(139, 92, 246, 0.15), transparent 70%);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--bg-dark);
    background-image: var(--gradient-glow);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    border-bottom: 1px solid var(--border-color);
    background: rgba(10, 13, 20, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 1rem 2rem;
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.4);
}

.brand-name {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-badge {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(59, 130, 246, 0.3);
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Main Container */
.main-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
    flex: 1;
    width: 100%;
}

.hero-section {
    text-align: center;
    max-width: 750px;
    margin: 0 auto 3rem auto;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Control Toolbar */
.control-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tone-pills {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tone-pill {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.45rem 0.9rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tone-pill:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.tone-pill.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: #ffffff;
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.range-slider {
    accent-color: var(--accent-purple);
    width: 120px;
    cursor: pointer;
}

/* Editor Workspace */
.editor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (max-width: 868px) {
    .editor-grid {
        grid-template-columns: 1fr;
    }
}

.editor-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.editor-box:focus-within {
    border-color: var(--accent-blue);
}

.editor-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    padding: 0.85rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.editor-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.editor-textarea {
    width: 100%;
    min-height: 280px;
    background: transparent;
    border: none;
    outline: none;
    padding: 1.25rem;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
}

.editor-footer {
    border-top: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.15);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Action Area */
.action-bar {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.btn-humanize {
    background: var(--gradient-primary);
    color: #ffffff;
    border: none;
    padding: 0.9rem 2.5rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-humanize:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 0.6);
}

.btn-humanize:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Score Metrics Cards */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 1.25rem;
    text-align: center;
}

.metric-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
}

.metric-value.good {
    color: var(--accent-emerald);
}

.metric-value.warning {
    color: var(--warning);
}

.metric-value.danger {
    color: var(--danger);
}

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