/* ── Global reset & base ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #f0f2f5;
    --sidebar: #ffffff;
    --surface: #ffffff;
    --surface-2: #f5f6f8;
    --border: #dde1e7;
    --accent: #4caf50;
    --accent-hover: #43a047;
    --danger: #e53935;
    --danger-hover: #c62828;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --input-bg: #f9fafb;
    --radius: 6px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background: var(--sidebar);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-right: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar .logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.sidebar nav a {
    display: block;
    padding: 8px 10px;
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: 0.9rem;
}
.sidebar nav a:hover, .sidebar nav a.active {
    background: var(--surface-2);
    color: var(--text);
    text-decoration: none;
}

.main {
    flex: 1;
    padding: 36px 48px;
    overflow-y: auto;
}

/* ── Centered single-column pages (landing, login, register) ── */
.center-page {
    max-width: 480px;
    margin: 80px auto;
    padding: 0 16px;
}

.landing-page {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 24px;
}

/* ── Cards ── */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

/* ── Typography ── */
h1 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
h2 { font-size: 1.4rem; font-weight: 600; margin-bottom: 10px; }
h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
p  { color: var(--text-muted); margin-bottom: 12px; }
p.light { color: var(--text); }
hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* ── Forms ── */
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 8px 12px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 9px 20px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background 0.15s, opacity 0.15s;
}
.btn-primary {
    background: var(--accent);
    color: #000;
}
.btn-primary:hover { background: var(--accent-hover); }

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

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--surface-2); color: var(--text); }

.btn-sm { padding: 5px 12px; font-size: 0.82rem; }

/* ── Messages / Alerts ── */
.messages { margin-bottom: 20px; }
.alert {
    padding: 10px 14px;
    border-radius: var(--radius);
    margin-bottom: 8px;
    font-size: 0.9rem;
}
.alert-success { background: #e8f5e9; border: 1px solid #a5d6a7; color: #2e7d32; }
.alert-error   { background: #ffebee; border: 1px solid #ef9a9a; color: #c62828; }
.alert-info    { background: #e3f2fd; border: 1px solid #90caf9; color: #1565c0; }

/* ── Dashboard table ── */
.calc-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}
.calc-table th,
.calc-table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}
.calc-table th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.calc-table tr:hover td { background: var(--surface-2); }

.actions { display: flex; gap: 8px; align-items: center; }

/* ── Inline form row ── */
.form-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}
.form-row .form-group { flex: 1; min-width: 160px; margin-bottom: 0; }

/* ── Placeholder page ── */
.placeholder {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

/* ── Phase 2: Scope entry ── */

.opt { font-size: 0.8rem; color: var(--text-muted); font-weight: 400; }

/* Section accordion */
.section-accordion {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
}
.section-summary {
    padding: 14px 18px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
    user-select: none;
}
.section-summary::-webkit-details-marker { display: none; }
.section-summary::before {
    content: "▶";
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: transform 0.2s;
    flex-shrink: 0;
}
details[open] .section-summary::before { transform: rotate(90deg); }
.section-body {
    padding: 0 18px 18px;
    border-top: 1px solid var(--border);
}

.entry-badge {
    background: var(--accent);
    color: #000;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 1px 7px;
    border-radius: 20px;
    margin-left: auto;
}

/* EF cascade preview */
.ef-preview {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    margin-top: 10px;
    font-size: 0.875rem;
}
.ef-preview-title {
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 6px;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.ef-preview-grid { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.ef-preview-grid div { color: var(--text); }

/* Entry cards */
.entry-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
    margin-bottom: 8px;
}
.entry-header { margin-bottom: 8px; font-size: 0.9rem; }
.entry-details {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    margin-bottom: 8px;
}
.entry-col { flex: 1; min-width: 160px; }
.entry-col .label { color: var(--text-muted); }
.entry-col div { margin-bottom: 2px; }
.entry-error {
    color: #ef9a9a;
    padding: 8px 0;
    font-size: 0.875rem;
}
.no-entries {
    color: var(--text-muted);
    font-size: 0.875rem;
    padding: 10px 0;
}

/* Scope 3 category grid */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
    margin-top: 20px;
}
.cat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.15s, background 0.15s;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.cat-card:hover {
    border-color: var(--accent);
    background: var(--surface-2);
    text-decoration: none;
}
.cat-label { font-weight: 600; font-size: 0.9rem; }
.cat-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.4; }
.cat-badge {
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
    margin-top: auto;
}

/* Category prev/next navigation */
.cat-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 28px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

/* Results */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 16px;
}
@media (max-width: 700px) {
    .results-grid { grid-template-columns: 1fr; }
}

/* flex helpers */
.flex-2 { flex: 2 !important; }

/* Calculation overview scope cards */
.overview-scope-card {
    flex: 1;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px 20px;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: border-color 0.15s, background 0.15s;
}
.overview-scope-card:hover {
    border-color: var(--accent);
    background: var(--surface-2);
    text-decoration: none;
    color: var(--text);
}
.overview-scope-title {
    font-size: 1.1rem;
    font-weight: 600;
}
.overview-scope-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    flex: 1;
}
.overview-scope-count {
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 8px;
}

/* ── Platform Overview ── */
.platform-stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px 24px;
    min-width: 160px;
    flex: 1;
}
.platform-stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 6px;
}
.platform-stat-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.platform-user-header {
    display: flex;
    padding: 6px 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border);
    margin-bottom: 4px;
}
.platform-user-row {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.15s;
    border-radius: 4px;
    user-select: none;
}
.platform-user-row:hover {
    background: var(--surface-2);
}
.platform-user-row.expanded {
    background: var(--surface-2);
    border-bottom-color: transparent;
}
.platform-row-chevron {
    width: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}
.platform-user-row.expanded .platform-row-chevron {
    transform: rotate(90deg);
}
.platform-detail-wrap {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.22s ease;
}
.platform-detail-wrap.open {
    grid-template-rows: 1fr;
}
.platform-detail-inner {
    overflow: hidden;
    background: var(--surface-2);
    border-left: 2px solid var(--accent);
    border-radius: 0 0 4px 4px;
}
.platform-chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.platform-chart-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}
.platform-chart-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}
@media (max-width: 900px) {
    .platform-chart-grid { grid-template-columns: 1fr; }
    .platform-stat { min-width: 130px; }
}

/* ── Confirmation modal ── */
.confirm-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
}
.confirm-modal-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    max-width: 440px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.confirm-modal-box h3 { margin-bottom: 12px; color: var(--text); }
.confirm-modal-box p { color: var(--text-muted); margin-bottom: 24px; font-size: 0.9rem; }
.confirm-modal-actions { display: flex; gap: 12px; justify-content: flex-end; }

/* ── Platform tabs ── */
.platform-tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); }
.platform-tab {
    background: none;
    border: none;
    padding: 8px 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: color 0.15s, border-color 0.15s;
}
.platform-tab:hover { color: var(--text); }
.platform-tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.waste-badge {
    display: inline-block;
    background: var(--danger);
    color: #fff;
    font-size: 0.68rem;
    font-weight: 700;
    border-radius: 10px;
    padding: 1px 6px;
    margin-left: 6px;
    vertical-align: middle;
}

/* ── Danger zone card ── */
.danger-zone { border-color: var(--danger) !important; }
.danger-zone h2 { margin-bottom: 8px; }

/* ── Policy pages (terms, privacy) ── */
.policy-body,
.policy-body h1, .policy-body h2, .policy-body h3,
.policy-body li, .policy-body td, .policy-body th,
.policy-body strong, .policy-body em { color: var(--text-muted); }
.policy-body table { border-collapse: collapse; width: 100%; }
.policy-body th, .policy-body td { border-bottom: 1px solid var(--border); padding: 8px 12px 8px 0; }
.policy-body th { border-bottom-width: 2px; font-weight: 600; }