/* ========== Reset & Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    /* Primary */
    --near-black: #141413;
    --terracotta: #c96442;
    --coral: #d97757;

    /* Surface & Background */
    --parchment: #f5f4ed;
    --ivory: #faf9f5;
    --white: #ffffff;
    --warm-sand: #e8e6dc;
    --dark-surface: #30302e;

    /* Neutrals & Text */
    --charcoal-warm: #4d4c48;
    --olive-gray: #5e5d59;
    --stone-gray: #87867f;
    --dark-warm: #3d3d3a;
    --warm-silver: #b0aea5;

    /* Borders */
    --border-cream: #f0eee6;
    --border-warm: #e8e6dc;
    --border-dark: #30302e;

    /* Rings */
    --ring-warm: #d1cfc5;
    --ring-deep: #c2c0b6;

    /* Semantic */
    --error-crimson: #b53333;
    --focus-blue: #3898ec;
    --success-green: #3a7d44;

    /* Typography */
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

body {
    font-family: var(--font-sans);
    background: var(--parchment);
    color: var(--near-black);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 16px;
    line-height: 1.60;
}

/* ========== Header Top Bar ========== */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.lang-switch {
    display: flex;
    gap: 0.4rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--warm-silver);
}

.user-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
}

.user-name {
    color: var(--ivory);
    font-weight: 500;
}

.header-link {
    color: var(--warm-silver);
    text-decoration: none;
    font-size: 0.8rem;
    padding: 3px 8px;
    border: 1px solid var(--border-dark);
    border-radius: 5px;
    transition: all 0.15s;
}

.header-link:hover {
    color: var(--ivory);
    border-color: var(--charcoal-warm);
}

.lang-btn {
    background: var(--dark-surface);
    color: var(--warm-silver);
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.lang-btn:hover {
    color: var(--ivory);
    background: var(--charcoal-warm);
}

.lang-btn.active {
    background: var(--terracotta);
    color: var(--ivory);
    border-color: var(--terracotta);
}

/* ========== Login Page ========== */
.login-card {
    max-width: 420px;
    margin: 0 auto;
    text-align: center;
}

.login-subtitle {
    color: var(--olive-gray);
    font-size: 0.94rem;
    margin-bottom: 2rem;
}

.login-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.btn-google {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    color: var(--near-black);
    border: 1px solid var(--border-warm);
    border-radius: 8px;
    padding: 10px 24px;
    font-family: var(--font-sans);
    font-size: 0.94rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
}

.btn-google:hover {
    background: var(--parchment);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.btn-guest {
    width: auto;
}

.login-divider {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 1rem;
    color: var(--stone-gray);
    font-size: 0.85rem;
}

.login-divider::before,
.login-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border-warm);
}

.guest-note {
    margin-top: 1.5rem;
    color: var(--stone-gray);
    font-size: 0.8rem;
}

/* ========== Modal ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal-box {
    background: var(--ivory);
    border-radius: 16px;
    padding: 2rem;
    max-width: 380px;
    width: 90%;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

.modal-box p {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    color: var(--near-black);
}

.modal-actions {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== Header ========== */
header {
    background: var(--near-black);
    color: var(--ivory);
    padding: 1.2rem 2rem 1.8rem;
    text-align: center;
}

header h1 {
    font-family: var(--font-serif);
    font-size: 2.3rem;
    font-weight: 500;
    line-height: 1.20;
    color: var(--ivory);
    margin-bottom: 0.4rem;
    letter-spacing: normal;
}

header .subtitle {
    font-family: var(--font-sans);
    font-size: 0.94rem;
    color: var(--warm-silver);
    line-height: 1.60;
}

nav {
    margin-top: 1.2rem;
    display: flex;
    justify-content: center;
    gap: 0.8rem;
}

nav a {
    color: var(--ivory);
    text-decoration: none;
    padding: 8px 16px 8px 12px;
    background: var(--dark-surface);
    border: 1px solid var(--border-dark);
    border-radius: 8px;
    font-size: 0.94rem;
    font-weight: 500;
    transition: background 0.2s;
}

nav a:hover {
    background: var(--charcoal-warm);
}

/* ========== Main ========== */
main {
    flex: 1;
    max-width: 860px;
    width: 100%;
    margin: 2.5rem auto;
    padding: 0 1.2rem;
}

/* ========== Card ========== */
.card {
    background: var(--ivory);
    border: 1px solid var(--border-cream);
    border-radius: 16px;
    box-shadow: rgba(0,0,0,0.05) 0px 4px 24px;
    padding: 2.5rem;
}

.card h2 {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 500;
    line-height: 1.20;
    color: var(--near-black);
    margin-bottom: 1.8rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-warm);
}

/* ========== Flash Messages ========== */
.flash-messages { margin-bottom: 1.5rem; }

.flash {
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    font-size: 0.94rem;
    line-height: 1.60;
}

.flash.error {
    background: #f9ebe8;
    color: var(--error-crimson);
    border: 1px solid #e8c9c4;
}

.flash.warning {
    background: #fdf6e8;
    color: #946b2d;
    border: 1px solid #eedcb1;
}

.flash.success {
    background: #ecf4ed;
    color: var(--success-green);
    border: 1px solid #c5dcc8;
}

/* ========== Params Grid ========== */
.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.2rem;
    margin-bottom: 2rem;
}

.param label {
    display: block;
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 1.3rem;
    line-height: 1.20;
    margin-bottom: 0.4rem;
    color: var(--near-black);
}

.param input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-warm);
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 1rem;
    text-align: center;
    color: var(--near-black);
    background: var(--white);
    transition: border-color 0.2s;
}

.param input:focus {
    outline: none;
    border-color: var(--focus-blue);
    box-shadow: 0 0 0 2px rgba(56, 152, 236, 0.15);
}

.param .hint {
    display: block;
    font-size: 0.75rem;
    color: var(--stone-gray);
    margin-top: 0.3rem;
    text-align: center;
    letter-spacing: 0.12px;
}

/* ========== Mode Section ========== */
.mode-section {
    margin-bottom: 2rem;
    padding: 1.2rem 1.5rem;
    background: var(--parchment);
    border: 1px solid var(--border-cream);
    border-radius: 12px;
}

.mode-section h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.20;
    margin-bottom: 0.8rem;
    color: var(--near-black);
}

.radio-group {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.radio-group label {
    cursor: pointer;
    font-size: 0.94rem;
    color: var(--olive-gray);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.radio-group input[type="radio"] {
    accent-color: var(--terracotta);
}

.manual-input {
    margin-top: 1rem;
}

.manual-input label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
    color: var(--olive-gray);
}

.manual-input input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-warm);
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--near-black);
    background: var(--white);
}

.manual-input input:focus {
    outline: none;
    border-color: var(--focus-blue);
    box-shadow: 0 0 0 2px rgba(56, 152, 236, 0.15);
}

/* ========== Buttons ========== */
.actions {
    margin-top: 2rem;
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 9.6px 16.8px;
    border: none;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 0.94rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.15s ease;
    line-height: 1.0;
}

.btn-primary {
    background: var(--terracotta);
    color: var(--ivory);
    box-shadow: var(--terracotta) 0px 0px 0px 0px, var(--terracotta) 0px 0px 0px 1px;
}

.btn-primary:hover {
    background: #b8593b;
}

.btn-secondary {
    background: var(--warm-sand);
    color: var(--charcoal-warm);
    box-shadow: var(--warm-sand) 0px 0px 0px 0px, var(--ring-warm) 0px 0px 0px 1px;
}

.btn-secondary:hover {
    background: var(--ring-warm);
}

.btn-danger {
    background: var(--parchment);
    color: var(--error-crimson);
    box-shadow: var(--parchment) 0px 0px 0px 0px, var(--ring-warm) 0px 0px 0px 1px;
}

.btn-danger:hover {
    background: #f9ebe8;
}

.btn-dark {
    background: var(--near-black);
    color: var(--warm-silver);
    border: 1px solid var(--dark-surface);
    border-radius: 12px;
}

.btn-dark:hover {
    color: var(--ivory);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* ========== Info Bar ========== */
.info-bar {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
    background: var(--parchment);
    border: 1px solid var(--border-cream);
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.info-bar span {
    font-family: var(--font-mono);
    font-size: 0.94rem;
    font-weight: 500;
    color: var(--charcoal-warm);
    letter-spacing: -0.32px;
}

/* ========== Elapsed & Comparison Badges ========== */
.elapsed-badge {
    background: var(--white);
    color: var(--near-black);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.8rem;
    border: 1px solid var(--border-warm);
}

.comparison-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.comparison-badge.new-best {
    background: #ecf4ed;
    color: var(--success-green);
}

.comparison-badge.tied {
    background: var(--parchment);
    color: var(--olive-gray);
}

.comparison-badge.worse {
    background: #fdf6e8;
    color: #946b2d;
}

/* ========== Samples Display ========== */
.samples-display {
    margin-bottom: 2rem;
}

.samples-display h3,
.results-display h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.20;
    margin-bottom: 0.8rem;
    color: var(--olive-gray);
}

.sample-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.sample-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.4rem;
    height: 2.4rem;
    padding: 0 0.5rem;
    background: var(--parchment);
    color: var(--charcoal-warm);
    border-radius: 24px;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.85rem;
    letter-spacing: -0.32px;
    box-shadow: var(--parchment) 0px 0px 0px 0px, var(--ring-warm) 0px 0px 0px 1px;
}

/* ========== Groups Table ========== */
.groups-table {
    max-height: 520px;
    overflow-y: auto;
    border: 1px solid var(--border-cream);
    border-radius: 12px;
    background: var(--white);
}

.groups-table table {
    width: 100%;
    border-collapse: collapse;
}

.groups-table thead {
    position: sticky;
    top: 0;
    z-index: 1;
}

.groups-table th {
    background: var(--parchment);
    padding: 0.8rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--stone-gray);
    letter-spacing: 0.12px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-warm);
}

.groups-table td {
    padding: 0.7rem 1rem;
    border-top: 1px solid var(--border-cream);
}

.groups-table tbody tr:first-child td {
    border-top: none;
}

.groups-table tr:hover td {
    background: var(--parchment);
}

.group-num {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--terracotta);
    width: 3rem;
    letter-spacing: -0.32px;
}

/* ========== Database Table ========== */
.db-list {
    border: 1px solid var(--border-cream);
    border-radius: 12px;
    overflow: hidden;
    background: var(--white);
}

.db-list table {
    width: 100%;
    border-collapse: collapse;
}

.db-list th {
    background: var(--parchment);
    padding: 0.8rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--stone-gray);
    letter-spacing: 0.12px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-warm);
}

.db-list td {
    padding: 0.8rem 1rem;
    border-top: 1px solid var(--border-cream);
    font-size: 0.9rem;
    color: var(--olive-gray);
}

.db-list tbody tr:first-child td {
    border-top: none;
}

.db-list tr:hover td {
    background: var(--parchment);
}

.label-cell {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--near-black);
    letter-spacing: -0.32px;
}

.action-cell {
    display: flex;
    gap: 0.5rem;
}

.label-tag {
    font-family: var(--font-mono);
    background: var(--parchment);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--charcoal-warm);
    box-shadow: var(--parchment) 0px 0px 0px 0px, var(--ring-warm) 0px 0px 0px 1px;
    letter-spacing: -0.32px;
}

.empty-msg {
    text-align: center;
    color: var(--stone-gray);
    padding: 3rem 2rem;
    font-size: 0.94rem;
    line-height: 1.60;
}

.empty-msg a {
    color: var(--terracotta);
    text-decoration: none;
}

.empty-msg a:hover {
    text-decoration: underline;
}

/* ========== Footer ========== */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--stone-gray);
    font-size: 0.75rem;
    letter-spacing: 0.12px;
}

/* ========== Responsive ========== */
@media (max-width: 767px) {
    header h1 { font-size: 1.6rem; }
    header { padding: 1.5rem 1rem; }
    .card { padding: 1.5rem; border-radius: 12px; }
    .card h2 { font-size: 1.3rem; }
    .params-grid { grid-template-columns: repeat(2, 1fr); }
    .radio-group { flex-direction: column; gap: 0.6rem; }
    .info-bar { gap: 0.8rem; font-size: 0.85rem; }
    .db-list { overflow-x: auto; }
    main { margin: 1.5rem auto; }
}

@media (max-width: 479px) {
    header h1 { font-size: 1.3rem; }
    .params-grid { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
    .param label { font-size: 1.1rem; }
    .actions { flex-direction: column; }
    .actions .btn { width: 100%; }
}

/* ========== Print ========== */
@media print {
    header, footer, .actions, nav { display: none; }
    body { background: white; }
    .card { box-shadow: none; border: none; }
    .groups-table { max-height: none; overflow: visible; }
}