/* ========== Design System ========== */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1a2744;
    --surface: #1e2a45;
    --border: rgba(255, 255, 255, 0.06);
    --text-primary: #e8eaf0;
    --text-secondary: #8b95a8;
    --text-muted: #5a6477;

    --meteo-primary: #3b82f6;
    --meteo-glow: rgba(59, 130, 246, 0.15);
    --meteo-bg: rgba(59, 130, 246, 0.08);

    --google-primary: #f59e0b;
    --google-glow: rgba(245, 158, 11, 0.15);
    --google-bg: rgba(245, 158, 11, 0.08);

    --diff-positive: #10b981;
    --diff-negative: #ef4444;
    --diff-neutral: #6b7280;

    --accent: #8b5cf6;
    --accent-glow: rgba(139, 92, 246, 0.2);

    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ========== Header ========== */
.header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--meteo-primary), var(--google-primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 400;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--surface);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--diff-positive);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

/* ========== Control Panel ========== */
.control-panel {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
}

.control-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    min-width: 140px;
}

.input-group label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    outline: none;
}

.input-group select,
.obs-input[type="date"],
select.obs-input {
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    outline: none;
    width: 100%;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%236366f1' d='M5 6L0 0h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.input-group select:hover,
select.obs-input:hover {
    border-color: var(--accent);
}

.input-group select:focus,
select.obs-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group select option {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 8px 12px;
}

.input-group select optgroup {
    background: var(--bg-primary);
    color: var(--accent);
    font-weight: 600;
    font-style: normal;
    font-size: 12px;
}

.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.btn-fetch {
    padding: 10px 28px;
    background: linear-gradient(135deg, var(--meteo-primary), var(--accent));
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    font-family: 'Inter', sans-serif;
}

.btn-fetch:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.3);
}

.btn-fetch:active {
    transform: translateY(0);
}

.btn-fetch:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ========== Loading ========== */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 26, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 16px;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--meteo-primary);
    border-right-color: var(--google-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========== Summary Cards ========== */
.summary-section {
    max-width: 1400px;
    margin: 24px auto;
    padding: 0 24px;
}

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

.summary-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.summary-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.meteo-card {
    border-top: 3px solid var(--meteo-primary);
}

.google-card {
    border-top: 3px solid var(--google-primary);
}

.diff-card {
    border-top: 3px solid var(--accent);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.source-badge {
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 600;
}

.source-badge.meteo {
    background: var(--meteo-bg);
    color: var(--meteo-primary);
}

.source-badge.google {
    background: var(--google-bg);
    color: var(--google-primary);
}

.source-badge.diff {
    background: var(--accent-glow);
    color: var(--accent);
}

.timing {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

.big-temp {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -2px;
}

.meteo-card .big-temp {
    color: var(--meteo-primary);
}

.google-card .big-temp {
    color: var(--google-primary);
}

.weather-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.detail {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.detail .label {
    color: var(--text-secondary);
}

.record-count {
    margin-top: 16px;
    font-size: 11px;
    color: var(--text-muted);
    text-align: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

/* Diff Card */
.diff-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 8px;
}

.diff-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    font-size: 13px;
}

.diff-item .label {
    color: var(--text-secondary);
}

.diff-value {
    font-weight: 600;
    font-size: 14px;
    padding: 2px 10px;
    border-radius: 4px;
}

.diff-value.positive {
    color: var(--diff-positive);
    background: rgba(16, 185, 129, 0.1);
}

.diff-value.negative {
    color: var(--diff-negative);
    background: rgba(239, 68, 68, 0.1);
}

.diff-value.neutral {
    color: var(--diff-neutral);
    background: rgba(107, 114, 128, 0.1);
}

/* ========== Charts ========== */
.charts-section {
    max-width: 1400px;
    margin: 32px auto;
    padding: 0 24px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 0;
    color: var(--text-primary);
}

/* Readonly inputs */
.input-group input[readonly] {
    opacity: 0.7;
    cursor: not-allowed;
    background: rgba(30, 42, 69, 0.5);
}

/* Charts header */
.charts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}

.time-range-buttons {
    display: flex;
    gap: 6px;
}

.range-btn {
    padding: 6px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.range-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.range-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.range-btn.reset-btn {
    background: transparent;
    border-color: var(--text-muted);
    color: var(--text-muted);
}

.range-btn.reset-btn:hover {
    border-color: var(--diff-negative);
    color: var(--diff-negative);
}

.zoom-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border);
}

.chart-card h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* ========== Table ========== */
.table-section {
    max-width: 1400px;
    margin: 32px auto;
    padding: 0 24px;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

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

.data-table th {
    background: var(--bg-card);
    padding: 12px 10px;
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    font-size: 12px;
}

.data-table .sub-header th {
    font-size: 11px;
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
}

.meteo-col {
    color: var(--meteo-primary) !important;
}

.google-col {
    color: var(--google-primary) !important;
}

.data-table td {
    padding: 10px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    font-variant-numeric: tabular-nums;
}

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

.data-table td.time-cell {
    text-align: left;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.data-table td.meteo-cell {
    color: var(--meteo-primary);
}

.data-table td.google-cell {
    color: var(--google-primary);
}

.data-table td.highlight {
    background: rgba(239, 68, 68, 0.08);
    font-weight: 600;
}

/* ========== Methodology ========== */
.methodology-section {
    max-width: 1400px;
    margin: 40px auto;
    padding: 0 24px;
}

.methodology-inner {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 32px;
    border: 1px solid var(--border);
}

.methodology-intro {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 12px 0 24px;
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.method-card {
    background: var(--surface);
    border-radius: var(--radius-sm);
    padding: 20px;
    border: 1px solid var(--border);
}

.method-card h4 {
    color: var(--accent);
    font-size: 15px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.method-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.equation {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: 6px;
    text-align: center;
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
    color: var(--text-primary);
    margin: 12px 0;
    border-left: 3px solid var(--accent);
}

.formula-details {
    list-style: none;
    font-size: 12px;
    color: var(--text-muted);
}

.formula-details li {
    margin-bottom: 4px;
}

.method-note {
    font-size: 11px !important;
    font-style: italic;
    margin-top: 12px;
    color: var(--text-muted) !important;
}

/* ========== Footer ========== */
.footer {
    max-width: 1400px;
    margin: 40px auto 0;
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .control-inner {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-fetch {
        justify-content: center;
    }

    .header-inner {
        flex-direction: column;
        gap: 8px;
    }

    .big-temp {
        font-size: 36px;
    }

    .weather-details {
        grid-template-columns: 1fr;
    }
}

/* Table pagination */
.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 20px;
}

.page-info {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}