:root {
    --bg: #f4f7fb;
    --surface: rgba(255, 255, 255, 0.88);
    --border: rgba(148, 163, 184, 0.26);
    --text: #0f172a;
    --muted: #64748b;
    --primary: #4f46e5;
    --primary-soft: rgba(79, 70, 229, 0.12);
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
    --radius: 22px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Inter, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(79, 70, 229, 0.18), transparent 34%),
        radial-gradient(circle at top right, rgba(14, 165, 233, 0.16), transparent 28%),
        var(--bg);
    color: var(--text);
}
a { color: inherit; text-decoration: none; }
code { background: #e2e8f0; padding: 2px 6px; border-radius: 8px; }
.app-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.sidebar {
    background: rgba(15, 23, 42, 0.96);
    color: #e2e8f0;
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
    width: 52px;
    height: 52px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #818cf8, #22d3ee);
    font-weight: 700;
    color: white;
}
.brand p, .sidebar-foot, .muted, .hero-copy p { color: #94a3b8; }
.sidebar-nav { display: grid; gap: 10px; }
.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 14px;
    color: #cbd5e1;
}
.nav-icon {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.08);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
}
.nav-link.active, .nav-link:hover { background: rgba(255,255,255,0.08); color: white; }
.nav-badge, .badge {
    margin-left: auto;
    min-width: 28px;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12px;
    text-align: center;
}
.sidebar-foot { margin-top: auto; font-size: 13px; display: grid; gap: 4px; }
.sidebar-user {
    display: grid;
    gap: 4px;
    padding: 16px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(148, 163, 184, 0.16);
}
.sidebar-user span,
.sidebar-user small { color: #94a3b8; }
.main-shell { display: flex; flex-direction: column; }
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 28px 34px 0;
}
.topbar h1 { margin: 4px 0 0; font-size: 30px; }
.topbar-actions, .hero-actions, .form-actions, .table-actions, .filter-actions, .section-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}
.content { padding: 28px 34px 40px; display: grid; gap: 22px; }
.hero-card, .panel, .stat-card, .mini-card {
    background: var(--surface);
    backdrop-filter: blur(18px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.hero-card {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    padding: 28px;
}
.hero-card h2, .hero-copy h2 { margin: 6px 0 10px; font-size: 28px; max-width: 760px; }
.eyebrow {
    margin: 0;
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--primary);
    font-weight: 700;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.stats-grid.compact { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.stat-card { padding: 22px; display: grid; gap: 10px; }
.stat-card.balance { background: linear-gradient(135deg, rgba(79,70,229,0.12), rgba(34,211,238,0.14)); }
.stat-card strong, .mini-card strong { font-size: 28px; }
.mini-stats { display: flex; gap: 14px; flex-wrap: wrap; }
.mini-card { padding: 18px 20px; min-width: 180px; }
.two-column { display: grid; grid-template-columns: 1.4fr 1fr; gap: 20px; }
.panel { padding: 24px; display: grid; gap: 18px; }
.section-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.section-head h3 { margin: 4px 0 0; font-size: 22px; }
.chart-canvas { width: 100%; height: 280px; border-radius: 20px; background: linear-gradient(180deg, rgba(79,70,229,0.06), rgba(15,23,42,0.01)); }
.progress-list, .reminder-list { display: grid; gap: 14px; }
.progress-track { height: 10px; background: #e2e8f0; border-radius: 999px; overflow: hidden; }
.progress-fill { display: block; height: 100%; border-radius: inherit; }
.progress-meta, .reminder-card, .attachment-row { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 14px 10px; border-bottom: 1px solid #e2e8f0; vertical-align: top; }
.data-table th { text-align: left; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.status {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    background: #e2e8f0;
    color: #334155;
}
.status-paid, .status-returned, .status-completed { background: rgba(5,150,105,0.12); color: var(--success); }
.status-pending { background: rgba(217,119,6,0.12); color: var(--warning); }
.status-partial { background: rgba(14,165,233,0.12); color: #0284c7; }
.reminder-card {
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.9);
}
.reminder-card p { margin: 4px 0 0; color: var(--muted); }
.reminder-meta { text-align: right; display: grid; gap: 6px; }
.btn {
    border: none;
    border-radius: 14px;
    padding: 11px 16px;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), #0ea5e9); color: white; }
.btn-soft { background: #eef2ff; color: var(--primary); }
.btn-danger { background: #fee2e2; color: var(--danger); }
.inline-form { margin: 0; }
.alert { padding: 16px 18px; border-radius: 16px; }
.alert-success { background: rgba(5,150,105,0.12); color: var(--success); }
.alert-error { background: rgba(220,38,38,0.1); color: var(--danger); }
.filter-grid, .form-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}
.search-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.field, .checkbox-field { display: grid; gap: 8px; font-weight: 600; }
.field input, .field select, .field textarea {
    width: 100%;
    border: 1px solid #cbd5e1;
    background: white;
    border-radius: 14px;
    padding: 12px 14px;
    font: inherit;
}
.field-full { grid-column: 1 / -1; }
.checkbox-field {
    grid-template-columns: auto 1fr;
    align-items: center;
    padding-top: 34px;
}
.checkbox-field.inline { display: flex; padding-top: 0; }
.color-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 8px;
}
.empty-state { color: var(--muted); text-align: center; padding: 24px 0; }
.menu-toggle { display: none; }
.menu-toggle {
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: white;
    padding: 10px 14px;
    font-weight: 700;
}
ul { margin: 8px 0 0 18px; }

.guest-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 32px;
}
.auth-shell {
    width: min(1120px, 100%);
    display: grid;
    grid-template-columns: 1.2fr 0.9fr;
    gap: 24px;
    align-items: stretch;
}
.auth-hero,
.auth-card {
    background: var(--surface);
    backdrop-filter: blur(18px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.auth-hero {
    padding: 34px;
    display: grid;
    gap: 18px;
    align-content: center;
}
.auth-hero h1 { margin: 0; font-size: 42px; line-height: 1.1; }
.auth-hero p:last-of-type { color: var(--muted); font-size: 16px; }
.auth-panel { display: flex; align-items: center; }
.auth-card {
    width: 100%;
    padding: 28px;
    display: grid;
    gap: 18px;
}
.auth-card h2 { margin: 4px 0 0; font-size: 28px; }
.form-stack {
    display: grid;
    gap: 16px;
}
.auth-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.auth-submit { width: 100%; }
.auth-note {
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.14);
}
.auth-note p { margin: 6px 0 0; color: var(--muted); }
.profile-columns { align-items: start; }

@media (max-width: 1280px) {
    .stats-grid, .stats-grid.compact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .two-column, .search-grid { grid-template-columns: 1fr; }
    .filter-grid, .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 920px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: 270px;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        z-index: 20;
    }
    .sidebar.open { transform: translateX(0); }
    .menu-toggle { display: inline-flex; }
    .topbar, .content { padding-left: 18px; padding-right: 18px; }
    .topbar { padding-top: 18px; }
    .hero-card { flex-direction: column; }
    .auth-shell { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .stats-grid, .stats-grid.compact, .filter-grid, .form-grid { grid-template-columns: 1fr; }
    .topbar { flex-direction: column; align-items: stretch; }
    .guest-page { padding: 16px; }
    .auth-hero h1 { font-size: 32px; }
}