/* ═══════════════════════════════════════════════════
   IOTrack — Data Viewer
   Aesthetic: Clean editorial / data-focused
   ═══════════════════════════════════════════════════ */

:root {
    --font-sans: 'DM Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

    /* Palette — Ink & Paper */
    --bg-page:      #f6f5f1;
    --bg-card:      #ffffff;
    --bg-header:    #1a1a1a;
    --bg-toolbar:   #ffffff;
    --bg-hover:     #f0eeea;
    --bg-active:    #e8e5df;
    --bg-input:     #f6f5f1;
    --bg-modal:     #ffffff;
    --bg-code:      #f0eeea;

    --text-primary:   #1a1a1a;
    --text-secondary: #6b6560;
    --text-tertiary:  #9a948e;
    --text-inverse:   #f6f5f1;
    --text-link:      #2a5a3a;

    --accent:         #2a5a3a;
    --accent-light:   #e8f0eb;
    --accent-hover:   #1e4a2e;

    --border:         #e0ddd7;
    --border-light:   #ebe8e3;

    --danger:         #c44;
    --warning:        #c90;
    --success:        #2a5a3a;

    --shadow-sm:    0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:    0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg:    0 8px 30px rgba(0,0,0,0.12);
    --shadow-modal: 0 20px 60px rgba(0,0,0,0.2);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

/* ── Reset ──────────────────────────────────────── */

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

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* ── Header ─────────────────────────────────────── */

.app-header {
    background: var(--bg-header);
    color: var(--text-inverse);
    padding: 0 24px;
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    color: var(--accent);
    font-size: 1.1rem;
    filter: brightness(1.6);
}

.header-divider {
    width: 1px;
    height: 20px;
    background: rgba(255,255,255,0.15);
}

.header-db-name {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.5);
    font-family: var(--font-mono);
    font-weight: 400;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    transition: background 0.3s;
}

.status-dot.connected { background: #5c6; }
.status-dot.error { background: var(--danger); }

.status-text {
    color: rgba(255,255,255,0.5);
}

.btn-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.5);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    cursor: pointer;
    margin-left: 6px;
    transition: all 0.15s;
}

.btn-logout:hover {
    background: rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.9);
    border-color: rgba(255,255,255,0.25);
}

/* ── Toolbar ────────────────────────────────────── */

.toolbar {
    background: var(--bg-toolbar);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    position: sticky;
    top: 54px;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ── Search ─────────────────────────────────────── */

.search-box {
    position: relative;
    flex: 1;
    max-width: 480px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 9px 70px 9px 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    background: var(--bg-input);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
    background: var(--bg-card);
}

.search-box input::placeholder {
    color: var(--text-tertiary);
}

.search-shortcut {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    padding: 2px 7px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-tertiary);
    background: var(--bg-card);
    pointer-events: none;
    line-height: 1.4;
}

.search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 4px;
    border-radius: 4px;
    line-height: 1;
}

.search-clear:hover { color: var(--text-primary); }

/* ── Buttons ────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.view-toggle {
    display: flex;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.btn-view {
    display: flex;
    align-items: center;
    padding: 6px 10px;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all 0.15s;
}

.btn-view:first-child { border-right: 1px solid var(--border); }
.btn-view:hover { color: var(--text-primary); background: var(--bg-hover); }
.btn-view.active { color: var(--accent); background: var(--accent-light); }

.record-count {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

/* ── Advanced Search ────────────────────────────── */

.advanced-search {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.advanced-search-inner {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.adv-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.adv-field label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-family: var(--font-mono);
}

.adv-field input {
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    background: var(--bg-input);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.adv-field input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.advanced-search-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* ── Content ────────────────────────────────────── */

.content {
    padding: 20px 24px;
    min-height: calc(100vh - 180px);
}

/* ── Loading ────────────────────────────────────── */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    gap: 16px;
    color: var(--text-tertiary);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2.5px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── States ─────────────────────────────────────── */

.error-state, .empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.error-icon, .empty-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.error-message {
    margin-bottom: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--danger);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    word-break: break-word;
}

/* ── Table View ─────────────────────────────────── */

.table-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.data-table thead th {
    padding: 11px 16px;
    text-align: left;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    background: var(--bg-page);
    position: sticky;
    top: 0;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    font-family: var(--font-mono);
}

.data-table thead th:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.data-table thead th .sort-arrow {
    opacity: 0.3;
    margin-left: 4px;
    font-size: 0.7rem;
}

.data-table thead th.sorted .sort-arrow {
    opacity: 1;
    color: var(--accent);
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border-light);
    cursor: pointer;
    transition: background 0.1s;
}

.data-table tbody tr:hover {
    background: var(--bg-hover);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

.data-table tbody td {
    padding: 10px 16px;
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
}

.data-table tbody td.cell-empty {
    color: var(--text-tertiary);
    font-style: italic;
    font-size: 0.8rem;
}

/* ── Card View ──────────────────────────────────── */

.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 16px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.card-header {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-id {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--text-tertiary);
    background: var(--bg-code);
    padding: 2px 7px;
    border-radius: 4px;
}

.card-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.card-field {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.card-field-label {
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
}

.card-field-value {
    font-size: 0.88rem;
    color: var(--text-primary);
    word-break: break-word;
}

.card-field-value.empty {
    color: var(--text-tertiary);
    font-style: italic;
    font-size: 0.82rem;
}

/* ── Pagination ─────────────────────────────────── */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 20px;
}

.page-info {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* ── Modal ──────────────────────────────────────── */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 24px;
    animation: fadeIn 0.15s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg-modal);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 680px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-modal);
    animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(12px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.15s;
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    overflow-y: auto;
    padding: 24px;
}

.detail-grid {
    display: grid;
    gap: 16px;
}

.detail-field {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
}

.detail-field:last-child { border-bottom: none; }

.detail-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    padding-top: 2px;
}

.detail-value {
    font-size: 0.92rem;
    color: var(--text-primary);
    word-break: break-word;
    line-height: 1.5;
}

.detail-value.empty {
    color: var(--text-tertiary);
    font-style: italic;
}

.detail-value.mono {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--bg-code);
    padding: 4px 8px;
    border-radius: 4px;
}

/* ── Footer ──────────────────────────────────────── */

.app-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 24px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border-light);
    margin-top: 20px;
}

.footer-version {
    font-family: var(--font-mono);
    background: var(--bg-code);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.7rem;
}

/* ── Utilities ──────────────────────────────────── */

.hidden { display: none !important; }

/* ── Responsive ─────────────────────────────────── */

@media (max-width: 768px) {
    .toolbar { flex-wrap: wrap; }
    .toolbar-left { width: 100%; }
    .search-box { max-width: 100%; }
    .toolbar-right { width: 100%; justify-content: space-between; }

    .advanced-search-inner {
        grid-template-columns: 1fr;
    }

    .cards-container {
        grid-template-columns: 1fr;
    }

    .card-fields {
        grid-template-columns: 1fr;
    }

    .detail-field {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .data-table {
        font-size: 0.82rem;
    }

    .data-table thead th,
    .data-table tbody td {
        padding: 8px 12px;
    }

    .content { padding: 12px; }
}

@media (max-width: 480px) {
    .app-header { padding: 0 16px; }
    .header-divider, .header-db-name { display: none; }
    .search-shortcut { display: none; }
    .btn span { display: none; }
}