@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600&display=swap');

:root {
    --ink: #1a1d29;
    --slate: #4a5568;
    --mist: #94a3b8;
    --cloud: #e2e8f0;
    --snow: #f8fafc;
    --white: #ffffff;
    --water: #0ea5e9;
    --water-deep: #0284c7;
    --water-glow: rgba(14, 165, 233, 0.12);
}

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

body {
    font-family: 'DM Sans', -apple-system, sans-serif;
    background: var(--snow);
    color: var(--ink);
    line-height: 1.5;
}

.site-header {
    background: var(--white);
    border-bottom: 1px solid var(--cloud);
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.site-brand {
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

.site-brand:hover {
    color: var(--water-deep);
}

.profile-ui {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.profile-email {
    max-width: min(40vw, 320px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--slate);
    font-size: 0.85rem;
    background: var(--snow);
    border: 1px solid var(--cloud);
    border-radius: 999px;
    padding: 0.3rem 0.65rem;
}

.profile-link {
    color: var(--slate);
    text-decoration: none;
    border: 1px solid var(--cloud);
    border-radius: 999px;
    padding: 0.3rem 0.65rem;
    font-size: 0.85rem;
    line-height: 1;
    background: var(--white);
}

.profile-link:hover {
    color: var(--ink);
    border-color: #cbd5e1;
}

.profile-link-primary {
    color: var(--water-deep);
    border-color: #bae6fd;
    background: #f0f9ff;
}

.profile-link-primary:hover {
    border-color: #7dd3fc;
    color: #0369a1;
}

.site-footer {
    margin: 3rem 0 1rem;
    text-align: center;
    color: var(--mist);
    font-size: 0.875rem;
}

.error-message {
    background: #fee2e2;
    color: #dc2626;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid #fecaca;
}

.station-id {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--water-deep);
    background: var(--water-glow);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    text-transform: uppercase;
}

/* Auth pages */
body.auth-page .site-footer {
    margin-top: 1.25rem;
}

body.auth-page .auth-main {
    max-width: 520px;
    margin: 0 auto;
    padding: 2.5rem 1rem 0;
}

body.auth-page .auth-card {
    background: var(--white);
    border: 1px solid var(--cloud);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.auth-page .auth-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

body.auth-page .auth-notice {
    border-radius: 10px;
    padding: 0.75rem 0.9rem;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

body.auth-page .auth-notice-error {
    color: #b91c1c;
    background: #fef2f2;
    border-color: #fecaca;
}

body.auth-page .auth-notice-success {
    color: #047857;
    background: #ecfdf5;
    border-color: #a7f3d0;
}

body.auth-page .auth-form-group {
    margin-bottom: 1rem;
}

body.auth-page .auth-form-group label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--slate);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

body.auth-page .auth-form-group input[type="email"],
body.auth-page .auth-form-group input[type="password"] {
    width: 100%;
    border: 1px solid var(--cloud);
    border-radius: 10px;
    background: var(--snow);
    color: var(--ink);
    font: inherit;
    padding: 0.7rem 0.85rem;
}

body.auth-page .auth-form-group input:focus {
    outline: none;
    border-color: var(--water);
    box-shadow: 0 0 0 3px var(--water-glow);
    background: var(--white);
}

body.auth-page .auth-hint {
    margin-top: 0.4rem;
    color: var(--mist);
    font-size: 0.78rem;
}

body.auth-page .auth-submit {
    width: 100%;
    margin-top: 0.5rem;
    border: 1px solid #7dd3fc;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--water) 0%, var(--water-deep) 100%);
    color: #fff;
    font: inherit;
    font-weight: 600;
    padding: 0.72rem 0.9rem;
    cursor: pointer;
}

body.auth-page .auth-submit:hover {
    filter: brightness(0.97);
}

body.auth-page .auth-switch {
    margin-top: 1.15rem;
    padding-top: 1rem;
    border-top: 1px solid var(--cloud);
    color: var(--slate);
    font-size: 0.9rem;
}

body.auth-page .auth-switch a {
    color: var(--water-deep);
    text-decoration: none;
}

body.auth-page .auth-switch a:hover {
    color: var(--water);
}

/* Home page */
body.home-page .container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

body.home-page .home-header {
    margin-bottom: 3rem;
    text-align: center;
}

body.home-page h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--ink);
}

body.home-page .subtitle {
    color: var(--slate);
    font-size: 1.125rem;
}

body.home-page .lake-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

body.home-page .lake-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 16px;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--cloud);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

body.home-page .lake-card:hover {
    border-color: var(--water);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

body.home-page .lake-name {
    font-weight: 500;
    font-size: 1.125rem;
}

body.home-page .empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--mist);
    background: var(--white);
    border-radius: 16px;
    border: 1px dashed var(--cloud);
}

/* Lake detail page */
body.lake-page {
    overflow-x: hidden;
}

body.lake-page .container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem;
}

body.lake-page .back-link {
    display: inline-block;
    color: var(--slate);
    text-decoration: none;
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    padding: 0.25rem 0;
}

body.lake-page .back-link:hover {
    color: var(--water);
}

body.lake-page .lake-header {
    margin-bottom: 1.5rem;
}

body.lake-page h1 {
    font-size: 1.75rem;
    font-weight: 600;
}

body.lake-page .station-id {
    display: inline-block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
}

body.lake-page .lake-meta-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.35rem;
    flex-wrap: wrap;
}

body.lake-page .lake-meta-row .station-id {
    margin-top: 0;
}

body.lake-page .level-change-indicators {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

body.lake-page .level-change-loading {
    font-size: 0.8rem;
    color: var(--mist);
    font-weight: 400;
}

body.lake-page .level-change-unavailable {
    font-size: 0.8rem;
    color: var(--mist);
}

body.lake-page .level-change-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    line-height: 1.2;
    font-weight: 600;
}

body.lake-page .level-change-indicator .arrow {
    font-size: 0.65rem;
    line-height: 1;
}

body.lake-page .level-change-indicator .period {
    letter-spacing: 0.02em;
}

body.lake-page .level-change-indicator .value {
    font-variant-numeric: tabular-nums;
}

/* Rising level: green */
body.lake-page .level-change-indicator.up {
    color: #14532d;
    background: #dcfce7;
    border: 1px solid #86efac;
}

body.lake-page .level-change-indicator.up .arrow {
    color: #15803d;
}

/* Falling level: red */
body.lake-page .level-change-indicator.down {
    color: #991b1b;
    background: #fee2e2;
    border: 1px solid #fca5a5;
}

body.lake-page .level-change-indicator.down .arrow {
    color: #dc2626;
}

body.lake-page .level-change-indicator.flat {
    color: #64748b;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
}

body.lake-page .chart-container {
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--cloud);
    padding: 1rem;
    margin-top: 1rem;
}

body.lake-page .chart-stage {
    position: relative;
}

body.lake-page #levelChart {
    display: block;
    width: 100%;
    height: 400px;
    min-height: 280px;
    touch-action: none;
}

body.lake-page .chart-hover-popover {
    position: absolute;
    pointer-events: auto;
    min-width: 140px;
    max-width: 220px;
    background: rgba(255, 255, 255, 0.96);
    color: #111827;
    padding: 0.35rem 0.45rem;
    border-radius: 5px;
    border: 1px solid #d1d5db;
    box-shadow: 0 6px 14px rgba(2, 8, 23, 0.18);
    font-size: 0.72rem;
    line-height: 1.2;
    z-index: 10;
    left: 0;
    top: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 80ms ease-out;
}

body.lake-page .chart-hover-popover.visible {
    opacity: 1;
    visibility: visible;
}

body.lake-page .chart-hover-popover .hover-date {
    color: #4b5563;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

body.lake-page .chart-hover-popover .hover-row {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.15rem;
    white-space: nowrap;
}

body.lake-page .chart-hover-popover .hover-main {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    flex: 1 1 auto;
    min-width: 0;
}

body.lake-page .chart-hover-popover .hover-swatch {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 2px;
    flex: 0 0 auto;
}

body.lake-page .chart-hover-popover .hover-label {
    color: #111827;
    font-weight: 600;
}

body.lake-page .chart-hover-popover .hover-value {
    color: #111827;
    font-variant-numeric: tabular-nums;
}

body.lake-page .chart-hover-popover .hover-edit-btn {
    border: 1px solid #d1d5db;
    background: #fff;
    color: #374151;
    border-radius: 4px;
    width: 1.1rem;
    height: 1.1rem;
    line-height: 1;
    font-size: 0.7rem;
    cursor: pointer;
    padding: 0;
    flex: 0 0 auto;
}

body.lake-page .chart-hover-popover .hover-edit-btn:hover {
    background: #f3f4f6;
}

body.lake-page .chart-hover-line {
    position: absolute;
    width: 1px;
    background: #dc2626;
    pointer-events: none;
    z-index: 8;
    left: 0;
    top: 0;
    opacity: 0;
    visibility: hidden;
}

body.lake-page .chart-hover-line.visible {
    opacity: 1;
    visibility: visible;
}

body.lake-page .chart-hover-dots {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 9;
    opacity: 0;
    visibility: hidden;
}

body.lake-page .chart-hover-dots.visible {
    opacity: 1;
    visibility: visible;
}

body.lake-page .chart-hover-dot {
    position: absolute;
    width: 9px;
    height: 9px;
    border-radius: 999px;
    background: #0ea5e9;
    border: 2px solid #fff;
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.25);
    pointer-events: none;
    left: 0;
    top: 0;
    transform: translate(-50%, -50%);
}

body.lake-page .year-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 0 0;
    margin-top: 1rem;
    border-top: 1px solid var(--cloud);
}

body.lake-page .year-legend label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--slate);
    user-select: none;
}

body.lake-page .year-legend label:hover {
    color: var(--ink);
}

body.lake-page .year-legend input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--water);
    cursor: pointer;
}

body.lake-page .year-legend .swatch {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 3px;
    flex-shrink: 0;
}

body.lake-page .year-legend label.disabled .swatch {
    opacity: 0.4;
}

body.lake-page .year-legend label.loading {
    opacity: 0.6;
}

body.lake-page .year-legend label.loading::after {
    content: '...';
    margin-left: 0.25rem;
}

body.lake-page .chart-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

body.lake-page .chart-control-btn {
    border: 1px solid var(--cloud);
    background: rgba(255, 255, 255, 0.92);
    color: var(--slate);
    border-radius: 6px;
    padding: 0.28rem 0.55rem;
    font-size: 0.78rem;
    cursor: pointer;
}

body.lake-page .chart-control-btn:hover {
    background: #f8fafc;
}

body.lake-page .reading-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

body.lake-page .reading-nav-btn {
    border: 1px solid var(--cloud);
    background: rgba(255, 255, 255, 0.92);
    color: var(--ink);
    border-radius: 6px;
    padding: 0.2rem 0.45rem;
    font-size: 0.8rem;
    cursor: pointer;
}

body.lake-page .reading-nav-btn:hover {
    background: #f8fafc;
}

body.lake-page .reading-nav-btn:disabled {
    opacity: 0.5;
    cursor: default;
}

body.lake-page .annotation-panel {
    margin-top: 1rem;
    display: grid;
    gap: 0.6rem;
}

body.lake-page .annotation-index-panel {
    margin-top: 1rem;
    border-top: 1px solid var(--cloud);
    padding-top: 0.8rem;
    display: grid;
    gap: 0.75rem;
}

body.lake-page .annotation-index-empty {
    color: var(--mist);
    font-size: 0.82rem;
}

body.lake-page .annotation-index-year-group {
    display: grid;
    gap: 0.35rem;
}

body.lake-page .annotation-index-year {
    font-size: 0.78rem;
    color: var(--slate);
    font-weight: 700;
    letter-spacing: 0.03em;
}

body.lake-page .annotation-index-items {
    display: grid;
    gap: 0.3rem;
}

body.lake-page .annotation-index-item {
    width: 100%;
    text-align: left;
    border: 1px solid transparent;
    background: #f8fafc;
    border-radius: 8px;
    padding: 0.45rem 0.55rem;
    cursor: pointer;
    display: grid;
    grid-template-columns: auto auto 1fr;
    gap: 0.55rem;
    align-items: center;
}

body.lake-page .annotation-index-item:hover {
    background: #f1f5f9;
}

body.lake-page .annotation-index-item.active {
    border-color: #7dd3fc;
    background: #ecfeff;
}

body.lake-page .annotation-index-item-date {
    font-size: 0.74rem;
    color: var(--slate);
}

body.lake-page .annotation-index-item-value {
    font-size: 0.74rem;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}

body.lake-page .annotation-index-item-text {
    font-size: 0.78rem;
    color: var(--ink);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

body.lake-page .annotation-placeholder {
    color: var(--slate);
    font-size: 0.875rem;
    padding: 0.75rem 0.85rem;
    background: #f8fafc;
    border: 1px solid var(--cloud);
    border-radius: 8px;
}

body.lake-page .annotation-card {
    border: none;
    border-radius: 8px;
    padding: 0.65rem;
    background: #fff;
}

body.lake-page .annotation-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.45rem;
    gap: 0.5rem;
}

body.lake-page .annotation-card-head-right {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

body.lake-page .annotation-card-title {
    font-size: 0.82rem;
    color: var(--ink);
    font-weight: 600;
}

body.lake-page .annotation-card-meta {
    font-size: 0.75rem;
    color: var(--slate);
}

body.lake-page .annotation-textarea {
    width: 100%;
    min-height: 72px;
    border: 1px solid var(--cloud);
    border-radius: 6px;
    padding: 0.5rem;
    background: #fff;
    font: inherit;
    font-size: 0.84rem;
    resize: vertical;
}

body.lake-page .annotation-textarea:focus {
    outline: none;
    border-color: #0ea5e9;
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.12);
}

body.lake-page .annotation-content {
    color: var(--ink);
    font-size: 0.84rem;
    white-space: pre-wrap;
    min-height: 1.1rem;
    padding: 0.3rem;
}

body.lake-page .annotation-empty {
    color: var(--slate);
    font-style: italic;
}

body.lake-page .annotation-edit-btn {
    border: 1px solid #d1d5db;
    background: #fff;
    color: #374151;
    border-radius: 4px;
    width: 1.2rem;
    height: 1.2rem;
    line-height: 1;
    font-size: 0.72rem;
    cursor: pointer;
    padding: 0;
}

body.lake-page .annotation-edit-btn:hover {
    background: #f3f4f6;
}

body.lake-page .annotation-edit-btn[disabled] {
    opacity: 0.6;
    cursor: default;
}

body.lake-page .loading {
    text-align: center;
    padding: 2rem;
    color: var(--slate);
}

@media (max-width: 640px) {
    .site-header-inner {
        flex-wrap: wrap;
    }

    .site-brand {
        width: 100%;
    }

    .profile-ui {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    body.auth-page .auth-main {
        padding-top: 1.25rem;
    }

    body.auth-page .auth-card {
        padding: 1.1rem;
        border-radius: 12px;
    }

    body.lake-page .container {
        padding: 1rem;
    }

    body.lake-page h1 {
        font-size: 1.375rem;
    }

    body.lake-page .chart-container {
        margin-left: -1rem;
        margin-right: -1rem;
        padding: 0.75rem;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    body.lake-page #levelChart {
        height: 280px;
        min-height: 240px;
    }

    body.lake-page .chart-hover-popover {
        font-size: 0.68rem;
        min-width: 132px;
    }

    body.lake-page .loading {
        padding: 1.5rem;
    }
}