:root {
    --bg: #eef2f7;
    --bg-strong: #e4e8ef;
    --panel: rgba(255, 255, 255, 0.88);
    --panel-solid: #ffffff;
    --blue: #3b82f6;
    --cyan: #2fa7a0;
    --green: #2fa7a0;
    --gold: #d6a24d;
    --red: #e5534b;
    --text: #1a1f2c;
    --text-dim: #5a6578;
    --text-muted: #8b95a5;
    --line: rgba(26,31,44,0.10);
    --shadow: 0 4px 24px rgba(12,26,60,0.08);
    --shadow-lg: 0 8px 40px rgba(12,26,60,0.12);
    --radius: 12px;
    --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    background:
        radial-gradient(1200px circle at 20% 12%, rgba(59,130,246,0.06), transparent 55%),
        radial-gradient(1000px circle at 80% 10%, rgba(214,162,77,0.06), transparent 60%),
        var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ── Shared Components ──────────────────────────── */

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

.card {
    background: var(--panel);
    backdrop-filter: blur(14px);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
}

.btn-primary {
    background: #1a2744;
    color: #fff;
    box-shadow: 0 2px 12px rgba(26,39,68,0.25);
}

.btn-primary:hover {
    background: #243352;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(26,39,68,0.35);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--line);
}

.btn-outline:hover {
    border-color: var(--blue);
    color: var(--blue);
}

.btn-danger {
    background: var(--red);
    color: #fff;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
}

input, select {
    font-family: inherit;
    font-size: 0.9rem;
    padding: 10px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--panel-solid);
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

/* ── Top Bar ────────────────────────────────────── */

.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: linear-gradient(90deg, rgba(255,255,255,0.92), rgba(255,255,255,0.8));
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 2px 16px rgba(12,26,60,0.06);
    padding: 0 24px;
}

.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.topbar .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
}

.topbar .logo img {
    height: 36px;
    width: auto;
}

.topbar .logo-text-group {
    display: flex;
    flex-direction: column;
    line-height: 1.25;
}

.topbar .logo-brand {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
}

.topbar .logo-brand .t-dark { color: #1a2744; }
.topbar .logo-brand .t-gold { color: #c89b3c; }

.topbar .logo-tagline {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.6rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.topbar .logo-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ── Invite Code Page ───────────────────────────── */

.invite-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.invite-card {
    width: 100%;
    max-width: 460px;
    text-align: center;
    padding: 48px 44px;
    border-top: 3px solid #c89b3c;
}

.invite-card .logo-area {
    margin-bottom: 32px;
}

.invite-card .logo-area img {
    height: 90px;
    width: auto;
    margin-bottom: 14px;
}

.brand-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
}

.brand-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.35rem;
    font-weight: 300;
    letter-spacing: 1.5px;
}

.brand-name .t1 {
    color: #1a2744;
}

.brand-name .t2 {
    color: #c89b3c;
}

.brand-tagline {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.58rem;
    font-weight: 400;
    letter-spacing: 4.5px;
    color: #c89b3c;
    text-transform: uppercase;
}

.brand-divider {
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, #c89b3c, transparent);
    margin: 16px auto 20px;
}

.invite-card h1 {
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: 6px;
    color: #1a2744;
    margin-bottom: 24px;
}

.invite-card .subtitle {
    font-size: 0.88rem;
    color: var(--text-dim);
    margin-bottom: 28px;
    line-height: 1.6;
}

.invite-input-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
    max-width: 260px;
    margin-left: auto;
    margin-right: auto;
}

.invite-input-group input {
    flex: 1;
    text-align: center;
    font-size: 0.88rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-family: 'Space Grotesk', monospace;
    border: 1px solid rgba(200, 155, 60, 0.25);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.invite-input-group input::placeholder {
    font-size: 0.82rem;
    letter-spacing: 1px;
    text-transform: none;
    color: var(--text-muted);
}

.invite-input-group input:focus {
    border-color: #c89b3c;
    box-shadow: 0 0 0 3px rgba(200, 155, 60, 0.1);
}

.invite-input-group .btn {
    width: 100%;
    padding: 10px 28px;
}

.invite-error {
    color: var(--red);
    font-size: 0.85rem;
    min-height: 24px;
    margin-top: 4px;
}

.invite-footer {
    margin-top: 40px;
    font-size: 0.78rem;
    color: var(--text-muted);
    padding-top: 20px;
    border-top: 1px solid var(--line);
}

/* ── Report Page ────────────────────────────────── */

.report-header {
    padding: 32px 0 24px;
}

.report-header h1 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 4px;
}

.report-header .meta {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.metric-card {
    padding: 20px;
    text-align: center;
}

.metric-card .label {
    font-size: 0.78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.metric-card .value {
    font-size: 1.6rem;
    font-weight: 500;
    font-family: 'Space Grotesk', sans-serif;
}

.metric-card .value.positive { color: var(--red); }
.metric-card .value.negative { color: var(--green); }
.metric-card .value.neutral  { color: var(--text); }

.chart-section {
    margin-bottom: 24px;
}

.chart-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.chart-toolbar h2 {
    font-size: 1.1rem;
    font-weight: 500;
}

.baseline-toggles {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.baseline-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    border: 1px solid var(--line);
    background: var(--panel-solid);
    transition: all 0.2s;
    user-select: none;
}

.baseline-toggle.active {
    border-color: var(--blue);
    background: rgba(59,130,246,0.08);
    color: var(--blue);
}

.baseline-toggle .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.chart-container {
    position: relative;
    height: 400px;
    background: var(--panel-solid);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
}

/* ── Report Date Selector ───────────────────────── */

.date-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.date-selector select {
    min-width: 150px;
}

/* ── Disclaimer ─────────────────────────────────── */

.disclaimer {
    margin-top: 40px;
    padding: 20px;
    background: rgba(214,162,77,0.06);
    border: 1px solid rgba(214,162,77,0.2);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    color: var(--text-dim);
    line-height: 1.8;
}

/* ── Admin Page ─────────────────────────────────── */

.admin-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: calc(100vh - 64px);
}

.admin-sidebar {
    background: var(--panel-solid);
    border-right: 1px solid var(--line);
    padding: 24px 0;
}

.admin-sidebar a {
    display: block;
    padding: 10px 24px;
    font-size: 0.88rem;
    color: var(--text-dim);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
    color: var(--blue);
    background: rgba(59,130,246,0.05);
    border-left-color: var(--blue);
}

.admin-content {
    padding: 32px;
    overflow-y: auto;
}

.admin-content h2 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th {
    text-align: left;
    padding: 10px 12px;
    font-weight: 500;
    color: var(--text-dim);
    border-bottom: 2px solid var(--line);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 500;
}

.badge-active { background: rgba(47,167,160,0.12); color: var(--green); }
.badge-inactive { background: rgba(229,83,75,0.1); color: var(--red); }
.badge-warn { background: rgba(214,162,77,0.15); color: #a07a2e; }

/* ── Loading & Empty States ─────────────────────── */

.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--text-dim);
}

/* ── Responsive ─────────────────────────────────── */

@media (max-width: 768px) {
    .topbar-inner {
        height: 56px;
    }

    .topbar .logo-text {
        display: none;
    }

    .invite-card {
        padding: 32px 24px;
    }

    .invite-input-group {
        flex-direction: column;
    }

    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .metric-card {
        padding: 14px;
    }

    .metric-card .value {
        font-size: 1.3rem;
    }

    .chart-container {
        height: 280px;
        padding: 10px;
    }

    .chart-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .admin-layout {
        grid-template-columns: 1fr;
    }

    .admin-sidebar {
        display: flex;
        overflow-x: auto;
        border-right: none;
        border-bottom: 1px solid var(--line);
        padding: 0;
    }

    .admin-sidebar a {
        white-space: nowrap;
        padding: 12px 16px;
        border-left: none;
        border-bottom: 3px solid transparent;
    }

    .admin-sidebar a.active {
        border-left-color: transparent;
        border-bottom-color: var(--blue);
    }

    .admin-content {
        padding: 20px 16px;
    }

    .data-table {
        font-size: 0.78rem;
    }

    .container {
        padding: 0 16px;
    }

    .report-header h1 {
        font-size: 1.2rem;
    }

    .disclaimer {
        font-size: 0.72rem;
    }

    .baseline-toggles {
        width: 100%;
    }

    .baseline-toggle {
        font-size: 0.75rem;
        padding: 4px 10px;
    }
}

@media (max-width: 420px) {
    .metrics-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .metric-card .label {
        font-size: 0.7rem;
    }

    .metric-card .value {
        font-size: 1.1rem;
    }

    .invite-card h1 {
        font-size: 1.2rem;
    }
}