/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #2c5f8a;
    --primary-dark: #1e4a6e;
    --primary-light: #e8f0f7;
    --bg: #f0f2f5;
    --card: #ffffff;
    --border: #dce1e6;
    --text: #1a1a1a;
    --text-secondary: #5f6b7a;
    --text-muted: #9aa5b4;
    --success: #22863a;
    --success-bg: #dcffe4;
    --warning: #b08800;
    --warning-bg: #fff8c5;
    --danger: #cf222e;
    --danger-bg: #ffebe9;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

/* ===== Common Header ===== */
.chat-header, .admin-header {
    background: var(--primary);
    padding: 0 16px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.header-icon {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: rgba(255,255,255,.15);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.header-title {
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #a8cce0;
    font-size: 12px;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #6fcf97;
    display: inline-block;
}

.header-link {
    color: rgba(255,255,255,.75);
    text-decoration: none;
    font-size: 13px;
    padding: 4px 8px;
    border-radius: 4px;
}

.header-link:hover { color: #fff; background: rgba(255,255,255,.1); }

.header-btn {
    background: rgba(255,255,255,.12);
    color: rgba(255,255,255,.85);
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    font-family: inherit;
}

.header-btn:hover { background: rgba(255,255,255,.2); color: #fff; }

/* ===== Login Page ===== */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, #1e4a6e 0%, #2c5f8a 50%, #3a7ab5 100%);
}

.login-card {
    background: var(--card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px 32px;
    width: 100%;
    max-width: 380px;
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.login-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background: #fafbfc;
    transition: border-color .15s, box-shadow .15s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44,95,138,.12);
    background: #fff;
}

.login-error {
    color: var(--danger);
    font-size: 13px;
    min-height: 20px;
    margin-bottom: 8px;
}

.login-btn {
    width: 100%;
    padding: 11px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: background .15s;
}

.login-btn:hover { background: var(--primary-dark); }
.login-btn:disabled { background: #a0b8cc; cursor: not-allowed; }

/* ===== Chat Page ===== */
.chat-container {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--card);
}

/* Messages Area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    background: #fafbfc;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.date-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 11px;
    padding: 4px 0;
}

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

/* Message Rows */
.msg-row {
    display: flex;
    gap: 8px;
    max-width: 88%;
}

.msg-row.msg-user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-row.msg-ai {
    align-self: flex-start;
}

.msg-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.msg-body {
    min-width: 0;
}

.msg-bubble {
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.65;
    word-break: break-word;
}

.bubble-user {
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.bubble-ai {
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    border-bottom-left-radius: 4px;
}

.bubble-ai p { margin-bottom: .5em; }
.bubble-ai p:last-child { margin-bottom: 0; }

.bubble-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid #f5c6cb;
    border-bottom-left-radius: 4px;
}

.source-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
    margin-top: 8px;
    margin-right: 4px;
}

.msg-time {
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 4px;
    padding: 0 2px;
}

.msg-row.msg-user .msg-time { text-align: right; }

/* Typing Indicator */
.typing-row {
    display: flex;
    gap: 8px;
    align-self: flex-start;
    align-items: flex-start;
}

.typing-bubble {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow);
}

.typing-bubble .dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--primary);
    animation: bounce 1.4s infinite ease-in-out;
}

.typing-bubble .dot:nth-child(1) { animation-delay: 0s; opacity: .35; }
.typing-bubble .dot:nth-child(2) { animation-delay: .2s; opacity: .55; }
.typing-bubble .dot:nth-child(3) { animation-delay: .4s; opacity: .8; }

@keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-3px); }
}

.typing-label {
    font-size: 11px;
    color: var(--text-muted);
}

/* Input Area */
.chat-input {
    padding: 10px 16px;
    background: var(--card);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.input-row {
    display: flex;
    gap: 8px;
}

#messageInput {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: #f5f6f8;
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color .15s, background .15s;
}

#messageInput:focus {
    border-color: var(--primary);
    background: #fff;
}

#sendBtn {
    padding: 10px 22px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 22px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    flex-shrink: 0;
    transition: background .15s;
}

#sendBtn:hover { background: var(--primary-dark); }
#sendBtn:disabled { background: #a0b8cc; cursor: not-allowed; }

.chat-footer {
    background: #f5f6f8;
    text-align: center;
    padding: 6px;
    font-size: 10px;
    color: var(--text-muted);
    flex-shrink: 0;
    border-top: 1px solid var(--border);
}

/* ===== Admin Page ===== */
.admin-body {
    background: var(--bg);
}

.admin-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.section {
    margin-bottom: 20px;
}

.section-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
    padding-left: 2px;
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

.stat-value.ok { color: var(--success); }
.stat-value.error { color: var(--danger); }

/* Settings Row */
.setting-row {
    padding: 16px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.setting-info {
    flex: 1;
    min-width: 180px;
}

.setting-label {
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 2px;
}

.setting-detail {
    font-size: 12px;
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Menlo', monospace;
}

.setting-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.setting-input {
    padding: 7px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: 'SF Mono', 'Menlo', monospace;
    width: 260px;
    max-width: 100%;
}

.setting-input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Toolbar */
.toolbar {
    padding: 12px 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.toolbar-input {
    padding: 7px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    flex: 1;
    min-width: 140px;
}

.toolbar-input:focus {
    outline: none;
    border-color: var(--primary);
}

.toolbar-select {
    padding: 7px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    background: var(--card);
}

/* Buttons */
.btn {
    padding: 7px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background .15s, opacity .15s;
    white-space: nowrap;
}

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

.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover { background: var(--primary-light); }
.btn-outline:disabled { opacity: .5; cursor: not-allowed; }

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
    border-radius: 4px;
}

/* Table */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.table th {
    background: #f7f8fa;
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.table td {
    padding: 10px 14px;
    border-bottom: 1px solid #f0f2f5;
    vertical-align: top;
}

.table tr:last-child td { border-bottom: none; }
.table-empty { text-align: center; color: var(--text-muted); padding: 24px 14px !important; }

/* Badge */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-ok { background: var(--success-bg); color: var(--success); }
.badge-warn { background: var(--warning-bg); color: var(--warning); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* Chunk Preview */
.chunk-preview {
    background: #f7f8fa;
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 12px;
    line-height: 1.5;
    max-height: 80px;
    overflow-y: auto;
    white-space: pre-wrap;
    max-width: 300px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border);
}

.pagination button {
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card);
    cursor: pointer;
    font-size: 12px;
    font-family: inherit;
}

.pagination button:hover { background: #f5f6f8; }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }
.pagination span { font-size: 12px; color: var(--text-secondary); }

/* Cost Info */
.cost-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.cost-col {
    padding: 16px;
}

.cost-col + .cost-col {
    border-left: 1px solid var(--border);
}

.cost-col-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .03em;
    margin-bottom: 10px;
}

.cost-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 6px 0;
    font-size: 13px;
    gap: 12px;
}

.cost-row .cost-label { color: var(--text-secondary); white-space: nowrap; }
.cost-row .cost-val { font-weight: 600; color: var(--text); text-align: right; }
.cost-row .cost-val.accent { color: var(--primary); }

.cost-footer {
    padding: 10px 16px;
    font-size: 12px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    background: #f9fafb;
}

@media (max-width: 640px) {
    .cost-columns { grid-template-columns: 1fr; }
    .cost-col + .cost-col { border-left: none; border-top: 1px solid var(--border); }
}

/* ===== Mobile ===== */
@media (max-width: 600px) {
    .header-title { font-size: 13px; }
    .status-indicator { display: none; }

    .chat-messages { padding: 12px; gap: 10px; }
    .msg-row { max-width: 92%; }
    .msg-bubble { font-size: 13px; padding: 9px 12px; }
    #messageInput { padding: 9px 14px; font-size: 14px; }
    #sendBtn { padding: 9px 16px; font-size: 13px; }

    .admin-main { padding: 12px; }
    .card-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
    .stat-card { padding: 12px; }
    .stat-value { font-size: 18px; }

    .setting-row { flex-direction: column; align-items: stretch; }
    .setting-actions { flex-direction: column; }
    .setting-input { width: 100%; }

    .toolbar { flex-direction: column; }
    .toolbar-input, .toolbar-select { width: 100%; }

    .table { font-size: 12px; }
    .table th, .table td { padding: 8px 10px; }
    .chunk-preview { max-width: 200px; }

    .login-card { padding: 32px 24px; }
}

@media (max-width: 380px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); }
}