/* ═══════════════════════════════════════════════
   SplitEasy — Expense Splitter
   Design: Warm editorial with geometric accents
   ═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg: #FAF7F2;
    --bg-card: #FFFFFF;
    --bg-dark: #1A1714;
    --text: #2C2520;
    --text-light: #8A7F74;
    --text-muted: #B5AC9F;
    --accent: #D4663A;
    --accent-light: #F2A97E;
    --accent-bg: #FEF0E8;
    --green: #3A8A5C;
    --green-bg: #E8F5EE;
    --red: #C44040;
    --red-bg: #FDE8E8;
    --blue: #3A6BD4;
    --blue-bg: #E8F0FE;
    --border: #E8E2D9;
    --border-strong: #D1C9BD;
    --shadow-sm: 0 1px 3px rgba(44,37,32,0.06);
    --shadow-md: 0 4px 16px rgba(44,37,32,0.08);
    --shadow-lg: 0 8px 32px rgba(44,37,32,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
}

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

body {
    font-family: 'IBM Plex Sans', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ─── Layout ──────────────────────────────────── */
.page-wrap {
    max-width: 820px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

/* ─── Header / Brand ──────────────────────────── */
.brand {
    text-align: center;
    margin-bottom: 48px;
}
.brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--accent);
    border-radius: 14px;
    margin-bottom: 16px;
    box-shadow: 0 4px 12px rgba(212,102,58,0.3);
}
.brand-icon svg { width: 28px; height: 28px; }
.brand h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--text);
}
.brand p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ─── Cards ───────────────────────────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.card-header h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.3rem;
    font-weight: 400;
}
.card-header .badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--accent-bg);
    color: var(--accent);
}

/* ─── Forms ───────────────────────────────────── */
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    margin-bottom: 6px;
}
.form-row {
    display: flex;
    gap: 12px;
}
.form-row .form-group { flex: 1; }

input[type="text"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 0.95rem;
    color: var(--text);
    background: var(--bg);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}
input:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(212,102,58,0.12);
}
input::placeholder { color: var(--text-muted); }

/* ─── Buttons ─────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 8px rgba(212,102,58,0.25);
}
.btn-primary:hover {
    background: #C05830;
    box-shadow: 0 4px 16px rgba(212,102,58,0.35);
    transform: translateY(-1px);
}
.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1.5px solid var(--border);
}
.btn-secondary:hover {
    background: var(--border);
}
.btn-danger {
    background: var(--red-bg);
    color: var(--red);
    border: 1px solid #f0c0c0;
}
.btn-danger:hover {
    background: var(--red);
    color: #fff;
}
.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}
.btn-block {
    width: 100%;
    justify-content: center;
}
.btn-ghost {
    background: transparent;
    color: var(--text-light);
    padding: 6px 10px;
}
.btn-ghost:hover { color: var(--accent); background: var(--accent-bg); }

/* ─── Entry Box (home page) ───────────────────── */
.entry-box {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}
.entry-box .form-group { flex: 1; margin-bottom: 0; }
.entry-box .btn { height: 42px; }

.divider {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 24px 0;
    position: relative;
}
.divider::before, .divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: calc(50% - 30px);
    height: 1px;
    background: var(--border);
}
.divider::before { left: 0; }
.divider::after { right: 0; }

/* ─── Campaign Page Tabs ──────────────────────── */
.tabs {
    display: flex;
    gap: 4px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: 28px;
}
.tab {
    flex: 1;
    text-align: center;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    background: transparent;
    color: var(--text-light);
    font-family: 'IBM Plex Sans', sans-serif;
}
.tab.active {
    background: var(--bg-card);
    color: var(--text);
    box-shadow: var(--shadow-sm);
}
.tab:hover:not(.active) {
    color: var(--text);
}

.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.25s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Member List ─────────────────────────────── */
.member-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    background: var(--bg);
    transition: border-color 0.2s;
}
.member-item:hover { border-color: var(--border-strong); }
.member-name {
    font-weight: 500;
    font-size: 0.95rem;
}
.member-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
    color: #fff;
    margin-right: 10px;
    flex-shrink: 0;
}
.member-actions { display: flex; gap: 4px; }

/* ─── Expense List ────────────────────────────── */
.expense-item {
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    background: var(--bg-card);
    transition: box-shadow 0.2s;
}
.expense-item:hover { box-shadow: var(--shadow-md); }
.expense-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}
.expense-desc {
    font-weight: 600;
    font-size: 1rem;
}
.expense-amount {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--accent);
    white-space: nowrap;
}
.expense-meta {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.6;
}
.expense-meta strong { color: var(--text); font-weight: 600; }
.expense-actions {
    display: flex;
    gap: 4px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

/* ─── Summary ─────────────────────────────────── */
.summary-card {
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid;
}
.summary-card.owes {
    background: var(--red-bg);
    border-color: #f0c0c0;
}
.summary-card.gets {
    background: var(--green-bg);
    border-color: #b0dcc0;
}
.summary-arrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}
.summary-arrow .arrow {
    color: var(--text-muted);
    font-size: 1.2rem;
}
.summary-amounts {
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
}
.summary-amounts .primary {
    font-weight: 600;
    font-size: 1rem;
}
.summary-amounts .secondary {
    color: var(--text-light);
    font-size: 0.82rem;
}

/* ─── Balance Table ───────────────────────────── */
.balance-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 16px;
}
.balance-table th {
    text-align: left;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-light);
    padding: 8px 12px;
    border-bottom: 2px solid var(--border);
}
.balance-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}
.balance-table tr:last-child td { border-bottom: none; }
.balance-positive { color: var(--green); font-weight: 600; }
.balance-negative { color: var(--red); font-weight: 600; }
.balance-zero { color: var(--text-muted); }

/* ─── Checkbox List ───────────────────────────── */
.check-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
    margin-top: 8px;
}
.check-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
}
.check-item:hover { border-color: var(--accent); }
.check-item.checked {
    border-color: var(--accent);
    background: var(--accent-bg);
}
.check-item input[type="checkbox"] { display: none; }
.check-box {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-strong);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}
.check-item.checked .check-box {
    background: var(--accent);
    border-color: var(--accent);
}
.check-item.checked .check-box::after {
    content: '✓';
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

/* ─── Modal ───────────────────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26,23,20,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    padding: 24px;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 520px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.25s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.25rem;
    margin-bottom: 20px;
}
.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* ─── Toast ───────────────────────────────────── */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 2000;
}
.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    animation: toastIn 0.3s ease;
    box-shadow: var(--shadow-md);
}
.toast.success { background: var(--green); color: #fff; }
.toast.error { background: var(--red); color: #fff; }
@keyframes toastIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ─── Empty States ────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
}
.empty-state svg { margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 0.95rem; }

/* ─── Campaign Header ────────────────────────── */
.campaign-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.campaign-header h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.8rem;
    font-weight: 400;
}
.campaign-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-light);
    background: var(--bg);
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid var(--border);
}
.campaign-currencies {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 28px;
}
.campaign-currencies strong { color: var(--accent); }

/* ─── Utility ─────────────────────────────────── */
.mt-12 { margin-top: 12px; }
.mt-20 { margin-top: 20px; }
.mb-8 { margin-bottom: 8px; }
.text-center { text-align: center; }
.text-small { font-size: 0.82rem; color: var(--text-light); }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

.select-all-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}
.select-all-row .btn { font-size: 0.78rem; padding: 4px 10px; }

/* ─── Admin Panel ─────────────────────────────── */
.campaign-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    background: var(--bg);
}
.campaign-list-info { flex: 1; }
.campaign-list-name { font-weight: 600; }
.campaign-list-meta { font-size: 0.8rem; color: var(--text-light); margin-top: 2px; }
.campaign-list-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
    margin-left: 12px;
}

/* ─── Responsive ──────────────────────────────── */
@media (max-width: 600px) {
    .page-wrap { padding: 24px 16px 60px; }
    .brand h1 { font-size: 1.5rem; }
    .card { padding: 20px; }
    .form-row { flex-direction: column; gap: 0; }
    .entry-box { flex-direction: column; }
    .entry-box .btn { width: 100%; }
    .tabs { overflow-x: auto; }
    .tab { white-space: nowrap; font-size: 0.78rem; padding: 8px 12px; }
    .summary-card { flex-direction: column; gap: 8px; text-align: center; }
    .summary-amounts { text-align: center; }
    .check-list { grid-template-columns: 1fr 1fr; }
    .modal { padding: 24px; margin: 16px; }
    .campaign-header { flex-direction: column; align-items: flex-start; gap: 8px; }
}