/* ============================================
   Erudious — Theming + UI
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600&family=Sohne:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---- Dark theme (default) ---- */
:root,
[data-theme-resolved="dark"] {
    --bg: #14110f;
    --bg-elev: #1c1916;
    --bg-elev-2: #25211c;
    --bg-pane: #1a1714;
    --border: #2d2823;
    --border-strong: #3a342c;
    --text: #ece6dc;
    --text-dim: #a39a8c;
    --text-muted: #6b6358;
    --accent: #d4a574;
    --accent-strong: #e6b888;
    --accent-fg: #2a1f14;
    --danger: #c45a5a;
    --danger-soft: rgba(196,90,90,0.1);
    --danger-border: rgba(196,90,90,0.3);
    --ok: #7aa67a;
    --ok-soft: rgba(122,166,122,0.1);
    --ok-border: rgba(122,166,122,0.3);
    --user-tint: rgba(212,165,116,0.08);
    --user-tint-border: rgba(212,165,116,0.25);
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* ---- Light theme ---- */
[data-theme-resolved="light"] {
    --bg: #faf8f4;
    --bg-elev: #ffffff;
    --bg-elev-2: #f3efe7;
    --bg-pane: #f5f1e9;
    --border: #e5dfd1;
    --border-strong: #cfc7b3;
    --text: #2a2520;
    --text-dim: #5e564b;
    --text-muted: #8a8275;
    --accent: #a06d35;
    --accent-strong: #8a5a25;
    --accent-fg: #ffffff;
    --danger: #b44545;
    --danger-soft: rgba(180,69,69,0.08);
    --danger-border: rgba(180,69,69,0.25);
    --ok: #4a7d4a;
    --ok-soft: rgba(74,125,74,0.08);
    --ok-border: rgba(74,125,74,0.25);
    --user-tint: rgba(160,109,53,0.07);
    --user-tint-border: rgba(160,109,53,0.25);
    --shadow: 0 2px 8px rgba(60,40,20,0.08);
}

:root {
    --serif: 'Fraunces', Georgia, serif;
    --sans: 'Sohne', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, monospace;
    --radius: 6px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.2s, color 0.2s;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
button { font-family: inherit; cursor: pointer; }

.brand {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    margin: 0;
    color: var(--text);
}
.brand-sub { color: var(--text-dim); font-size: 0.9rem; margin: 4px 0 0; }

/* ============================================
   Buttons
   ============================================ */
.btn-primary {
    background: var(--accent);
    color: var(--accent-fg);
    border: none;
    padding: 9px 18px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.92rem;
    transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-strong); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-ghost, .btn-ghost-small {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    padding: 8px 14px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: all 0.15s;
    text-decoration: none;
    display: inline-block;
}
.btn-ghost:hover, .btn-ghost-small:hover {
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-ghost-small { padding: 5px 10px; font-size: 0.82rem; }
.btn-danger { color: var(--danger); border-color: var(--danger-border); }
.btn-danger:hover { color: var(--danger); border-color: var(--danger); }

/* ============================================
   Theme toggle button
   ============================================ */
.theme-toggle {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-dim);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s;
    padding: 0;
}
.theme-toggle:hover {
    color: var(--text);
    border-color: var(--accent);
}
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme-resolved="light"] .theme-toggle .icon-sun { display: block; }
[data-theme-resolved="light"] .theme-toggle .icon-moon { display: none; }

/* ============================================
   Login
   ============================================ */
.auth-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background:
        radial-gradient(ellipse at top, color-mix(in srgb, var(--accent) 5%, transparent), transparent 60%),
        var(--bg);
}
.auth-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 40px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow);
}
.auth-header { margin-bottom: 28px; }
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; }
.auth-form label span { font-size: 0.85rem; color: var(--text-dim); }
.auth-form input {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 10px 12px;
    font-family: inherit;
    font-size: 0.95rem;
    transition: border 0.15s;
}
.auth-form input:focus { outline: none; border-color: var(--accent); }
.auth-form button { margin-top: 10px; }

.alert {
    background: var(--danger-soft);
    border: 1px solid var(--danger-border);
    color: var(--danger);
    padding: 10px 14px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

/* ============================================
   App shell (chat)
   ============================================ */
.app-body { overflow: hidden; }
.app-shell {
    display: grid;
    grid-template-columns: 280px 1fr;
    height: 100vh;
}

.sidebar {
    background: var(--bg-pane);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.sidebar-head {
    padding: 20px 18px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.sidebar-head-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.sidebar-head .btn-ghost { width: 100%; text-align: center; }

.convo-list { flex: 1; overflow-y: auto; padding: 8px; }
.convo {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 9px 12px;
    border-radius: var(--radius);
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: 2px;
    transition: background 0.15s, color 0.15s;
}
.convo:hover { background: var(--bg-elev); color: var(--text); }
.convo.is-active {
    background: var(--bg-elev-2);
    color: var(--text);
    border-left: 2px solid var(--accent);
    padding-left: 10px;
}
.convo-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.convo-delete {
    background: none; border: none; color: var(--text-muted);
    font-size: 1.2rem; line-height: 1; padding: 0 4px;
    opacity: 0; transition: opacity 0.15s, color 0.15s;
}
.convo:hover .convo-delete { opacity: 1; }
.convo-delete:hover { color: var(--danger); }
.convo-empty { color: var(--text-muted); padding: 16px; font-size: 0.88rem; }

.sidebar-foot {
    border-top: 1px solid var(--border);
    padding: 14px 18px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}
.user-tag {
    font-family: var(--mono);
    font-size: 0.82rem;
    color: var(--text-dim);
    flex: 1;
}

/* ============================================
   Chat pane
   ============================================ */
.chat-pane {
    display: flex; flex-direction: column;
    overflow: hidden;
    background: var(--bg);
}
.chat-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 32px 40px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.empty-state {
    text-align: center;
    margin: auto;
    color: var(--text-dim);
}
.empty-state h2 {
    font-family: var(--serif);
    font-weight: 500;
    color: var(--text);
    font-size: 1.6rem;
    margin: 0 0 8px;
}

.msg {
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.msg-role {
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}
.msg-user .msg-role { color: var(--accent); }
.msg-body {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    padding: 14px 18px;
    border-radius: var(--radius);
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}
.msg-user .msg-body {
    background: var(--user-tint);
    border-color: var(--user-tint-border);
}
.msg-sources {
    display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; align-items: center;
}
.msg-sources-label {
    font-family: var(--mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    margin-right: 4px;
}
.source-tag {
    background: var(--bg-elev-2);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-family: var(--mono);
}

.composer {
    padding: 16px 40px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg);
    display: flex;
    gap: 12px;
    align-items: flex-end;
    max-width: 832px;
    margin: 0 auto;
    width: 100%;
}
.composer textarea {
    flex: 1;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 12px 14px;
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    max-height: 200px;
    transition: border 0.15s;
}
.composer textarea:focus { outline: none; border-color: var(--accent); }
.composer button { padding: 12px 22px; }

/* Streaming caret */
.caret {
    display: inline-block;
    width: 8px;
    height: 1.1em;
    background: var(--accent);
    vertical-align: text-bottom;
    margin-left: 2px;
    animation: caret-blink 1s steps(2) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }
.msg-streaming .msg-body { border-left: 2px solid var(--accent); }

.typing { display: inline-flex; gap: 4px; align-items: center; }
.typing span {
    width: 6px; height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; }
    30% { opacity: 1; }
}

/* ============================================
   Admin
   ============================================ */
.admin-body { background: var(--bg); }
.admin-shell { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.admin-nav {
    background: var(--bg-pane);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.admin-nav nav { display: flex; flex-direction: column; gap: 2px; margin: 20px 0; }
.admin-nav nav a {
    padding: 8px 12px;
    border-radius: var(--radius);
    color: var(--text-dim);
    font-size: 0.92rem;
    transition: background 0.15s, color 0.15s;
}
.admin-nav nav a:hover { background: var(--bg-elev); color: var(--text); }
.admin-nav nav a.is-active {
    background: var(--bg-elev-2);
    color: var(--text);
    border-left: 2px solid var(--accent);
    padding-left: 10px;
}

.admin-main { padding: 32px 40px; overflow-y: auto; max-width: 1100px; }
.admin-head {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px;
}
.admin-head h2 {
    font-family: var(--serif); font-weight: 500; font-size: 1.7rem; margin: 0;
}

.flash {
    background: var(--ok-soft);
    border: 1px solid var(--ok-border);
    color: var(--ok);
    padding: 10px 14px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 28px;
}
.stat {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    display: flex; flex-direction: column; gap: 4px;
}
.stat-num {
    font-family: var(--serif); font-size: 2rem; font-weight: 500;
    color: var(--text); line-height: 1;
}
.stat-label {
    font-family: var(--mono); font-size: 0.75rem;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text-muted);
}

.card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}
.card h3 { margin: 0 0 12px; font-family: var(--serif); font-weight: 500; font-size: 1.1rem; }
.card code {
    font-family: var(--mono); font-size: 0.85rem;
    background: var(--bg); padding: 2px 6px; border-radius: 3px;
    color: var(--accent);
}
.card .ok { color: var(--ok); }
.card .err { color: var(--danger); }
.empty-card { text-align: center; padding: 40px; color: var(--text-dim); }

.data-table {
    width: 100%; border-collapse: collapse;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.data-table th, .data-table td {
    padding: 11px 16px; text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}
.data-table th {
    background: var(--bg-elev-2);
    color: var(--text-dim);
    font-weight: 500;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg-elev-2); }
.data-table .actions { display: flex; gap: 8px; align-items: center; }

.form-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex; flex-direction: column; gap: 16px;
    max-width: 900px;
}
.form-card label { display: flex; flex-direction: column; gap: 6px; }
.form-card label span { font-size: 0.85rem; color: var(--text-dim); }
.form-card input, .form-card textarea, .form-card select {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 10px 12px;
    font-family: inherit;
    font-size: 0.93rem;
    transition: border 0.15s;
}
.form-card textarea { font-family: var(--mono); line-height: 1.5; resize: vertical; }
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
    outline: none; border-color: var(--accent);
}
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }
.form-actions { display: flex; gap: 10px; }

.form-inline { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.form-inline input, .form-inline select {
    background: var(--bg); border: 1px solid var(--border); color: var(--text);
    padding: 8px 10px; border-radius: var(--radius);
    font-family: inherit; font-size: 0.9rem;
}

details summary { cursor: pointer; font-size: 0.82rem; color: var(--text-dim); }

/* Upload dropzone */
.upload-form { display: flex; flex-direction: column; gap: 14px; }
.dropzone {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 6px; padding: 30px 20px;
    background: var(--bg);
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    text-align: center;
}
.dropzone:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, transparent); }
.dropzone.is-drag { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.dropzone-text { font-family: var(--serif); font-size: 1.05rem; color: var(--text); }
.dropzone-files { font-family: var(--mono); font-size: 0.82rem; color: var(--text-dim); }

/* ============================================
   Preferences page
   ============================================ */
.prefs-body { background: var(--bg); }
.prefs-shell {
    max-width: 760px;
    margin: 0 auto;
    padding: 32px 24px 60px;
}
.prefs-head {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}
.prefs-head h1 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.7rem;
    margin: 0;
    flex: 1;
}
.prefs-section {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
    margin-bottom: 18px;
}
.prefs-section h2 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.15rem;
    margin: 0 0 6px;
}
.prefs-help {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin: 0 0 16px;
}
.prefs-section textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    padding: 12px 14px;
    font-family: var(--mono);
    font-size: 0.9rem;
    line-height: 1.55;
    resize: vertical;
}
.prefs-section textarea:focus { outline: none; border-color: var(--accent); }

/* Theme swatches */
.theme-options {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.theme-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    min-width: 110px;
}
.theme-option:hover { border-color: var(--border-strong); }
.theme-option input { position: absolute; opacity: 0; pointer-events: none; }
.theme-option:has(input:checked) {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 6%, transparent);
}
.theme-swatch {
    width: 56px;
    height: 36px;
    border-radius: 4px;
    border: 1px solid var(--border-strong);
    position: relative;
    overflow: hidden;
}
.theme-swatch-light { background: linear-gradient(135deg, #faf8f4 50%, #f3efe7 50%); }
.theme-swatch-dark { background: linear-gradient(135deg, #14110f 50%, #25211c 50%); }
.theme-swatch-auto {
    background: linear-gradient(135deg, #faf8f4 50%, #14110f 50%);
}

/* Tone preset cards */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 10px;
}
.preset-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}
.preset-card input { position: absolute; opacity: 0; pointer-events: none; }
.preset-card:hover { border-color: var(--border-strong); }
.preset-card.is-selected,
.preset-card:has(input:checked) {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 6%, transparent);
}
.preset-title {
    font-family: var(--serif);
    font-size: 1rem;
    color: var(--text);
}
.preset-desc {
    font-size: 0.82rem;
    color: var(--text-dim);
    line-height: 1.45;
}

/* ============================================
   Mobile
   ============================================ */
@media (max-width: 768px) {
    .app-shell, .admin-shell { grid-template-columns: 1fr; }
    .sidebar, .admin-nav { display: none; }
    .chat-scroll, .composer { padding-left: 16px; padding-right: 16px; }
    .admin-main { padding: 20px; }
    .prefs-shell { padding: 20px 16px 40px; }
    .theme-options { flex-direction: column; }
    .theme-option { flex-direction: row; min-width: 0; justify-content: flex-start; }
}