:root {
    --bg-color: #090d16;
    --card-bg: #131c2e;
    --card-border: #26334d;
    --accent-emerald: #10b981;
    --accent-emerald-hover: #059669;
    --accent-cyan: #38bdf8;
    --accent-rose: #f43f5e;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --code-bg: #05080f;
    --radius: 10px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

code, pre, .stream-code {
    font-family: 'JetBrains Mono', monospace;
}

.app-wrapper {
    max-width: 1320px;
    margin: 0 auto;
    padding: 24px;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 24px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    font-size: 2.5rem;
    background: #1e293b;
    padding: 10px 16px;
    border-radius: 12px;
    border: 1px solid var(--card-border);
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.header-status {
    display: flex;
    align-items: center;
    gap: 12px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
}

.badge-valid { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-invalid { background: rgba(244, 63, 94, 0.15); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.3); }
.badge-loading { background: rgba(148, 163, 184, 0.15); color: #cbd5e1; border: 1px solid rgba(148, 163, 184, 0.3); }

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: currentColor;
}

/* Tabs */
.app-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 8px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
    color: var(--accent-cyan);
    background: #1e293b;
    box-shadow: inset 0 -2px 0 var(--accent-cyan);
}

/* Panes */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Layout Grids */
.grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 900px) {
    .grid-2col { grid-template-columns: 1fr; }
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.card.full-width {
    margin-bottom: 24px;
}

.subcard {
    background: #0d1322;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 16px;
    margin-top: 16px;
}

.subcard h3 {
    font-size: 0.95rem;
    color: var(--accent-cyan);
    margin-bottom: 12px;
}

.card h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 4px;

}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed #334155;
    border-radius: var(--radius);
    padding: 36px 20px;
    text-align: center;
    cursor: pointer;
    background: rgba(15, 23, 42, 0.4);
    transition: var(--transition);
}

.drop-zone:hover {
    border-color: var(--accent-cyan);
    background: rgba(56, 189, 248, 0.05);
}

.drop-icon { font-size: 2.5rem; margin-bottom: 8px; }

/* Forms & Inputs */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-control, .form-select {
    width: 100%;
    padding: 10px 14px;
    background: #090d16;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--accent-cyan);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 8px;
    max-height: 180px;
    overflow-y: auto;
    background: #090d16;
    padding: 12px;
    border-radius: 6px;
    border: 1px solid var(--card-border);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-block { width: 100%; }

.btn-primary { background: #0284c7; color: #fff; }
.btn-primary:hover { background: #0369a1; }

.btn-secondary { background: #334155; color: #f8fafc; }
.btn-secondary:hover { background: #475569; }

.btn-accent { background: var(--accent-emerald); color: #000; font-weight: 700; }
.btn-accent:hover { background: var(--accent-emerald-hover); }

/* Tables */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

.data-table th, .data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.88rem;
}

.data-table th {
    background: #0d1322;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.78rem;
}

.data-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 24px;
}

.badge-tag {
    background: #1e293b;
    color: var(--accent-cyan);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.sys-tag {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* Stream Box */
.stream-box {
    background: var(--code-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.stream-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.stream-badge {
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: 600;
}

.stream-code {
    color: #a7f3d0;
    font-size: 0.9rem;
    word-break: break-all;
    line-height: 1.4;
}

.actions-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active { display: flex; }

.modal-content {
    width: 100%;
    max-width: 520px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 0.9rem;
    border-bottom: 1px dashed rgba(255,255,255,0.05);
}

/* Hint Tooltip Styles */
.hint-icon {
    position: relative;
    cursor: pointer;
    margin-left: 6px;
    font-size: 0.9rem;
    display: inline-block;
}

.hint-tooltip {
    visibility: hidden;
    width: 220px;
    background-color: #0f172a;
    color: #38bdf8;
    text-align: left;
    border: 1px solid var(--accent-cyan);
    border-radius: 6px;
    padding: 8px 12px;
    position: absolute;
    z-index: 100;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    font-size: 0.78rem;
    font-weight: normal;
    text-transform: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

.hint-icon:hover .hint-tooltip {
    visibility: visible;
    opacity: 1;
}