:root {
    --bg-color: #f0f2f5;
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-primary: #1a1a1a;
    --text-secondary: #64748b;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --error-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --border-radius: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --glass-border: 1px solid rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #f0f2f5 0%, #e2e8f0 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem;
}

.container { max-width: 1200px; margin: 0 auto; }

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border-radius: 50px;
    border: var(--glass-border);
}

.back-link:hover {
    color: var(--accent-color);
    transform: translateX(-4px);
    background: #fff;
}

.back-link svg { width: 18px; height: 18px; }

h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #1e293b, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.app-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 2rem;
    align-items: start;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    margin-bottom: 2rem;
}

.mode-toggle {
    display: flex;
    background: rgba(0,0,0,0.04);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 1.5rem;
}

.mode-btn {
    flex: 1;
    padding: 0.6rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.mode-btn.active {
    background: #fff;
    color: var(--accent-color);
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

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

.input-group .hint {
    display: block;
    margin-top: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.4;
}

.inline-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

textarea, input[type="text"], input[type="number"] {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.5);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    resize: vertical;
}

textarea:focus, input[type="text"]:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-color);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.options-group { margin-bottom: 1.5rem; }

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.6rem;
    cursor: pointer;
}

.checkbox-item input { width: 18px; height: 18px; cursor: pointer; }
.checkbox-item label { margin-bottom: 0; cursor: pointer; }

.primary-btn {
    width: 100%;
    padding: 1rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: inherit;
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.primary-btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

.secondary-btn {
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    font-size: 0.9rem;
}

.secondary-btn:hover { background: #fff; color: var(--accent-color); }
.secondary-btn.full { width: 100%; margin-top: 1rem; }

.tip-box {
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.tip-box small { color: var(--text-secondary); line-height: 1.4; display: block; }

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.results-panel { min-height: 500px; }

.placeholder-msg {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    color: var(--text-secondary);
    text-align: center;
    opacity: 0.6;
}

.placeholder-msg svg { width: 64px; height: 64px; margin-bottom: 1rem; }

.progress-bar {
    position: relative;
    height: 28px;
    background: rgba(255,255,255,0.6);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: var(--glass-border);
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent-color), #60a5fa);
    transition: width 0.3s ease;
}

.progress-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.results-table-wrap {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border-radius: var(--border-radius);
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    animation: fadeInUp 0.5s ease-out;
}

.results-table-wrap header.table-head {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.results-table-wrap header.table-head h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.filter-input {
    padding: 0.5rem 0.85rem !important;
    width: 220px !important;
    font-size: 0.85rem !important;
}

table.results {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

table.results th, table.results td {
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(0,0,0,0.04);
    vertical-align: top;
}

table.results th {
    background: rgba(0,0,0,0.02);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    user-select: none;
}

table.results th:hover { color: var(--accent-color); }

table.results td.url a {
    color: var(--text-primary);
    text-decoration: none;
    word-break: break-all;
    font-weight: 500;
}

table.results td.url a:hover { color: var(--accent-color); text-decoration: underline; }

.count-pill {
    display: inline-block;
    background: #dcfce7;
    color: #10b981;
    padding: 0.15rem 0.55rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.8rem;
    min-width: 32px;
    text-align: center;
}

.count-pill.zero { background: #f1f5f9; color: #94a3b8; }
.count-pill.high { background: #fef3c7; color: #d97706; }

.term-breakdown {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.term-breakdown span {
    display: inline-block;
    margin-right: 0.5rem;
}

.term-breakdown b { color: var(--text-primary); }

.error-row td { color: var(--error-color); font-style: italic; }

.error-banner {
    padding: 1rem 1.25rem;
    background: #fef2f2;
    border-left: 4px solid var(--error-color);
    color: #991b1b;
    border-radius: 12px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

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

@media (max-width: 968px) {
    .app-grid { grid-template-columns: 1fr; }
    .filter-input { width: 100% !important; }
}