:root {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --surface-muted: #f9fafb;
    --border: #d8dde4;
    --border-strong: #b8c0cc;
    --text: #1f2933;
    --text-muted: #5a6577;
    --accent: #1f4e8c;
    --accent-hover: #173d6f;
    --accent-soft: #e8eef6;
    --danger: #8c2a2a;
    --success: #1f6b3e;
    --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 1px rgba(15, 23, 42, 0.03);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PT Sans", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
}

body {
    display: block;
    min-height: 100vh;
}

[hidden] {
    display: none !important;
}

/* Sidebar */
.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: #1c2733;
    color: #d8dde4;
    display: flex;
    flex-direction: column;
    border-right: 1px solid #131a23;
}

.sidebar__brand {
    padding: 24px 20px 20px;
    border-bottom: 1px solid #2a3543;
    line-height: 1.2;
}

.sidebar__brand-line {
    font-size: 13px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #a4adba;
}

.sidebar__brand-line--accent {
    color: #ffffff;
    font-size: 18px;
    letter-spacing: 0.02em;
    text-transform: none;
    margin-top: 2px;
    font-weight: 600;
}

.sidebar__nav {
    display: flex;
    flex-direction: column;
    padding: 12px 8px;
    gap: 2px;
    flex: 1;
}

.nav-item {
    text-align: left;
    background: transparent;
    color: #c5ccd6;
    border: none;
    border-left: 3px solid transparent;
    padding: 10px 14px;
    font: inherit;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.12s, color 0.12s, border-color 0.12s;
}

.nav-item:hover {
    background: #25323f;
    color: #ffffff;
}

.nav-item.is-active {
    background: #25323f;
    color: #ffffff;
    border-left-color: #4a90e2;
    font-weight: 500;
}

.sidebar__footer {
    padding: 12px 20px;
    font-size: 12px;
    color: #6b7585;
    border-top: 1px solid #2a3543;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar__user {
    font-weight: 500;
    color: #d8dde4;
}

.sidebar__version {
    color: #6b7585;
}

.button--small {
    padding: 4px 10px;
    font-size: 12px;
    align-self: flex-start;
}

/* Login screen */
.login-screen {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--bg);
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 32px;
    width: 100%;
    max-width: 380px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.login-card__title {
    margin: 0;
    font-size: 22px;
    color: var(--accent);
}

.login-card__subtitle {
    margin: -8px 0 8px;
    color: var(--text-muted);
}

#app-shell {
    display: flex;
    min-height: 100vh;
}

/* Content */
.content {
    flex: 1;
    padding: 32px 40px 48px;
    overflow-y: auto;
}

.section {
    display: none;
    max-width: 1100px;
    margin: 0 auto;
}

.section.is-visible {
    display: block;
}

.section__header {
    margin-bottom: 24px;
}

.section__header h1 {
    margin: 0 0 6px;
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
}

.section__subtitle {
    margin: 0;
    color: var(--text-muted);
    max-width: 720px;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 20px 24px;
    box-shadow: var(--shadow);
}

.card + .card,
.section > .card + * {
    margin-top: 16px;
}

.card__title {
    margin: 0 0 12px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.card__subtitle {
    margin: 16px 0 6px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 12px;
}

.card__header .card__title {
    margin: 0;
}

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

a.button {
    text-decoration: none;
    display: inline-block;
}

/* Form */
.form-row + .form-row {
    margin-top: 16px;
}

.field {
    display: flex;
    flex-direction: column;
}

.field__label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.field__hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

input[type="file"],
textarea {
    font: inherit;
    color: var(--text);
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 8px 10px;
    width: 100%;
    transition: border-color 0.12s, background 0.12s;
}

textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

input[type="file"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: #ffffff;
}

.form-actions {
    display: flex;
    gap: 8px;
    margin-top: 20px;
    align-items: center;
}

.button {
    font: inherit;
    padding: 8px 16px;
    border-radius: 3px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
}

.button--primary {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

.button--primary:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.button--primary:disabled {
    background: var(--border-strong);
    border-color: var(--border-strong);
    cursor: not-allowed;
}

.button--ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}

.button--ghost:hover {
    background: var(--surface-muted);
}

/* Status */
.status {
    margin-top: 16px;
    padding: 10px 12px;
    border-radius: 3px;
    border: 1px solid var(--border);
    background: var(--surface-muted);
    font-size: 13px;
}

.status--info {
    border-color: var(--border-strong);
    color: var(--text);
}

.status--error {
    border-color: #d8b4b4;
    background: #fbeeee;
    color: var(--danger);
}

.status--success {
    border-color: #b9d4c2;
    background: #eef6f1;
    color: var(--success);
}

/* Result */
.result {
    margin-top: 24px;
}

.result__topic-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 16px;
}

.result__topic-bar .result__topic {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-top: 4px;
}

.result__topic-meta {
    margin: 0;
    text-align: right;
}

.result__grid {
    display: grid;
    grid-template-columns: minmax(320px, 420px) 1fr;
    gap: 16px;
}

/* Candidates list */
.candidates {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.candidate {
    display: block;
    width: 100%;
    text-align: left;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--border);
    border-radius: 3px;
    padding: 10px 12px;
    cursor: pointer;
    font: inherit;
    color: inherit;
    transition: background 0.12s, border-color 0.12s;
}

.candidate > * {
    text-align: left;
}

.candidate:hover {
    background: var(--surface-muted);
    border-color: var(--border-strong);
}

.candidate.is-active {
    background: var(--accent-soft);
    border-color: var(--accent);
    border-left-color: var(--accent);
    border-left-width: 3px;
}

.candidate.is-missing {
    opacity: 0.7;
}

.candidate__head {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 4px;
    text-align: left;
}

.candidate__rank {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--surface-muted);
    padding: 1px 6px;
    border-radius: 8px;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.candidate.is-active .candidate__rank {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.candidate__id {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    flex: 1;
    word-break: break-word;
}

.candidate__reasoning {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.45;
}

.candidate__confidence-row {
    margin-top: 6px;
}

/* Template selected meta */
.result__template-meta {
    margin: 0 0 10px;
    padding: 6px 10px;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

.result__template-meta strong {
    color: var(--text);
}

.result__meta {
    margin: 0 0 8px;
    display: grid;
    gap: 6px;
}

.result__meta-row {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 8px;
    font-size: 13px;
}

.result__meta-row dt {
    color: var(--text-muted);
}

.result__meta-row dd {
    margin: 0;
    color: var(--text);
}

.result__reasoning {
    margin: 0;
    color: var(--text);
    font-size: 13px;
}

.card--template {
    display: flex;
    flex-direction: column;
}

.result__template {
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 14px 16px;
    margin: 0;
    font-family: -apple-system, "Segoe UI", "PT Sans", Arial, sans-serif;
    font-size: 13.5px;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text);
    flex: 1;
    overflow: auto;
    max-height: 600px;
}

/* Confidence pill */
.confidence {
    display: inline-block;
    padding: 1px 8px;
    border-radius: 10px;
    font-size: 12px;
    border: 1px solid var(--border-strong);
    background: var(--surface-muted);
    color: var(--text-muted);
}

.confidence--high {
    border-color: #b9d4c2;
    background: #eef6f1;
    color: var(--success);
}

.confidence--medium {
    border-color: #d6c79a;
    background: #f7f1de;
    color: #6b5210;
}

.confidence--low {
    border-color: #d8b4b4;
    background: #fbeeee;
    color: var(--danger);
}

/* Debug trace */
.debug {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
}

.debug > summary {
    cursor: pointer;
    padding: 12px 24px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    user-select: none;
}

.debug > summary:hover {
    color: var(--text);
}

.debug[open] > summary {
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.debug__block {
    padding: 12px 24px 4px;
}

.debug__block:last-child {
    padding-bottom: 16px;
}

.debug__label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.debug__code {
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 10px 12px;
    margin: 0;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 12px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text);
    max-height: 320px;
    overflow: auto;
}

/* Summary */
.summary__text {
    margin: 0 0 8px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text);
    white-space: pre-wrap;
}

.summary__points {
    margin: 0;
    padding-left: 20px;
    color: var(--text);
    font-size: 13.5px;
    line-height: 1.6;
}

.summary__points li + li {
    margin-top: 4px;
}

.summary__points-empty {
    color: var(--text-muted);
    list-style: none;
    margin-left: -20px;
}

/* Placeholder */
.placeholder {
    background: var(--surface);
    border: 1px dashed var(--border-strong);
    border-radius: 4px;
    padding: 64px 24px;
    text-align: center;
    color: var(--text-muted);
}

.placeholder__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.placeholder__text {
    max-width: 480px;
    margin: 0 auto;
    font-size: 13px;
}

/* Responsive */
@media (max-width: 900px) {
    #app-shell {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        flex-direction: row;
        align-items: center;
    }
    .sidebar__brand {
        border-bottom: none;
        border-right: 1px solid #2a3543;
        padding: 12px 16px;
    }
    .sidebar__nav {
        flex-direction: row;
        flex: 1;
        padding: 8px;
    }
    .nav-item {
        border-left: none;
        border-bottom: 3px solid transparent;
    }
    .nav-item.is-active {
        border-left-color: transparent;
        border-bottom-color: #4a90e2;
    }
    .sidebar__footer {
        display: none;
    }
    .content {
        padding: 20px;
    }
    .result__grid {
        grid-template-columns: 1fr;
    }
}