/* ============================================================
   PlantIsland · 海岛植物图鉴
   Design inspired by iNaturalist — clean cards, warm whites,
   botanical specimen label aesthetic.
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    --bg-page: #FAF9F6;
    --bg-card: #FFFFFF;
    --text-primary: #2C2C2C;
    --text-secondary: #6B6B6B;
    --text-muted: #999999;
    --accent: #7D9B76;
    --accent-dark: #4A6746;
    --accent-light: #E8F0E6;
    --border: #E8E5DF;
    --border-light: #F0EDE8;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
    --radius: 6px;
    --radius-sm: 4px;
    --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', Georgia, serif;
    --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-latin: 'EB Garamond', 'Playfair Display', Georgia, 'Times New Roman', serif;
    --max-width: 1200px;
    --nav-height: 64px;
}

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

html {
    font-size: 16px;
    -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: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--accent-dark);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--accent);
}

/* ---------- Navigation ---------- */
.nav {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.92);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.nav-brand span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

/* ---------- Layout ---------- */
.main {
    flex: 1;
    padding: 0 24px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 0;
}

.container--narrow {
    max-width: 800px;
}

/* ---------- Hero ---------- */
.hero {
    padding: 80px 0 64px;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 48px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.03em;
    margin-bottom: 12px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 32px;
}

.hero-stat {
    text-align: center;
}

.hero-stat-number {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-dark);
}

.hero-stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ---------- Section Headers ---------- */
.section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 28px;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
}

.section-header a {
    font-size: 0.9rem;
    color: var(--accent);
}

/* ---------- Plant Cards ---------- */
.plant-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.plant-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: box-shadow 0.25s, transform 0.25s;
}

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

.plant-card-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: var(--border-light);
}

.plant-card-placeholder {
    width: 100%;
    height: 220px;
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 2.5rem;
}

.plant-card-body {
    padding: 16px 18px 20px;
}

.plant-card-name {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.plant-card-latin {
    font-family: var(--font-latin);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.plant-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.plant-card-meta span {
    background: var(--bg-page);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
}

/* ---------- Island Cards ---------- */
.island-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.island-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: box-shadow 0.2s;
}

.island-card:hover {
    box-shadow: var(--shadow-sm);
}

.island-card-name {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.island-card-count {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.island-card-count strong {
    color: var(--accent-dark);
    font-size: 1.1rem;
}

/* ---------- Plant Detail ---------- */
.plant-detail {
    max-width: 860px;
    margin: 0 auto;
}

.plant-detail-header {
    margin-bottom: 32px;
}

.plant-detail-header h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.plant-detail-latin {
    font-family: var(--font-latin);
    font-style: italic;
    font-size: 1.15rem;
    color: var(--text-secondary);
}

.plant-detail-hero {
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 32px;
    background: var(--border-light);
}

.plant-detail-hero img {
    width: 100%;
    max-height: 540px;
    object-fit: cover;
}

.plant-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 8px;
    margin-bottom: 32px;
}

.plant-gallery img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: opacity 0.2s;
}

.plant-gallery img:hover {
    opacity: 0.85;
}

/* Specimen Label */
.specimen-label {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-bottom: 32px;
}

.specimen-label h3 {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-light);
}

.specimen-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 14px 24px;
}

.specimen-item {
    font-size: 0.9rem;
}

.specimen-item-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 2px;
}

.specimen-item-value {
    color: var(--text-primary);
}

/* Observation Notes */
.observation-notes {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--text-primary);
    margin-bottom: 40px;
}

.observation-notes h2 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    margin-bottom: 16px;
}

.observation-notes p {
    margin-bottom: 14px;
}

/* Related Plants */
.related-plants {
    padding: 36px 0;
    border-top: 1px solid var(--border-light);
}

/* ---------- Taxonomy Tree ---------- */
.taxonomy-tree {
    max-width: 760px;
    margin: 0 auto;
}

.taxonomy-family {
    margin-bottom: 36px;
}

.taxonomy-family h2 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-dark);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 14px;
}

.taxonomy-genus {
    margin-bottom: 14px;
    padding-left: 18px;
    border-left: 2px solid var(--accent-light);
}

.taxonomy-genus h3 {
    font-family: var(--font-latin);
    font-style: italic;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.taxonomy-species {
    padding-left: 18px;
    font-size: 0.92rem;
    color: var(--text-primary);
}

.taxonomy-species a {
    display: inline-block;
    padding: 2px 0;
}

.taxonomy-species + .taxonomy-species {
    margin-left: 12px;
}

/* ---------- Search & Filter Bar ---------- */
.filter-bar {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.filter-bar input,
.filter-bar select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-page);
    transition: border-color 0.2s;
}

.filter-bar input:focus,
.filter-bar select:focus {
    outline: none;
    border-color: var(--accent);
}

.filter-bar input {
    min-width: 200px;
    flex: 1;
}

.filter-bar select {
    min-width: 120px;
}

.filter-bar button {
    padding: 8px 20px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
    font-family: var(--font-sans);
}

.filter-bar button:hover {
    background: var(--accent-dark);
}

.filter-bar .btn-reset {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 8px 16px;
}

.filter-bar .btn-reset:hover {
    color: var(--text-primary);
    background: var(--bg-page);
}

/* ---------- Pagination ---------- */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 36px;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
    transition: all 0.2s;
}

.pagination a:hover {
    background: var(--accent-light);
    color: var(--accent-dark);
    border-color: var(--accent);
}

.pagination .current {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 32px 24px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: auto;
}

.beian {
    margin-top: 8px;
    font-size: 0.78rem;
}

.beian a {
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}

.beian a:hover {
    color: var(--text-secondary);
}

.beian-icon {
    width: 16px;
    height: 16px;
    vertical-align: middle;
}

/* ---------- Flash Messages ---------- */
.flash {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.92rem;
}

.flash-success {
    background: #E8F5E9;
    color: #2E7D32;
    border: 1px solid #C8E6C9;
}

.flash-error {
    background: #FFEBEE;
    color: #C62828;
    border: 1px solid #FFCDD2;
}

/* ============================================================
   ADMIN PANEL
   ============================================================ */

/* ---------- Admin Layout ---------- */
.admin-body {
    background: #F5F4F1;
}

.admin-nav {
    background: var(--text-primary);
    color: white;
    height: var(--nav-height);
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.admin-nav-brand {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    color: white;
}

.admin-nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
    align-items: center;
}

.admin-nav-links a {
    color: rgba(255,255,255,0.75);
    font-size: 0.88rem;
    transition: color 0.2s;
}

.admin-nav-links a:hover {
    color: white;
}

.admin-nav-links .user-info {
    color: var(--accent);
    font-size: 0.85rem;
    margin-right: 8px;
}

/* ---------- Dashboard ---------- */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 36px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.stat-card-number {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--accent-dark);
}

.stat-card-label {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ---------- Admin Table ---------- */
.admin-table {
    width: 100%;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    overflow: hidden;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 12px 16px;
    text-align: left;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-light);
}

.admin-table th {
    background: var(--bg-page);
    font-weight: 600;
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tr:hover td {
    background: var(--bg-page);
}

.admin-table .actions {
    display: flex;
    gap: 8px;
}

/* ---------- Forms ---------- */
.form-container {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group label .required {
    color: #C62828;
    margin-left: 2px;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group input[type="url"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-card);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(125, 155, 118, 0.15);
}

.form-group textarea {
    min-height: 160px;
    resize: vertical;
    line-height: 1.7;
}

.form-group .help-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-page);
    color: var(--text-primary);
}

.btn-danger {
    background: transparent;
    color: #C62828;
    border: 1px solid #FFCDD2;
}

.btn-danger:hover {
    background: #FFEBEE;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
}

/* ---------- Image Upload ---------- */
.image-upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
    color: var(--text-muted);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.image-upload-area:hover {
    border-color: var(--accent);
    background: var(--accent-light);
}

.image-previews {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 14px;
}

.image-preview-item {
    position: relative;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-light);
    aspect-ratio: 1;
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-item .preview-actions {
    position: absolute;
    top: 4px;
    right: 4px;
    display: flex;
    gap: 4px;
}

.image-preview-item .preview-actions button {
    background: rgba(0,0,0,0.6);
    color: white;
    border: none;
    border-radius: 3px;
    padding: 3px 8px;
    font-size: 0.75rem;
    cursor: pointer;
}

.image-preview-item .preview-actions button:hover {
    background: rgba(0,0,0,0.8);
}

.image-preview-item .primary-badge {
    position: absolute;
    bottom: 4px;
    left: 4px;
    background: var(--accent);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 3px;
}

/* ---------- Login Page ---------- */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-page);
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 36px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow-md);
}

.login-card h1 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 8px;
}

.login-card .login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 28px;
}

.login-card .btn {
    width: 100%;
    justify-content: center;
    margin-top: 8px;
}

/* ---------- Empty State ---------- */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.6;
}

.empty-state h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-stats {
        gap: 28px;
    }

    .plant-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }

    .plant-card-image {
        height: 160px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-bar input {
        min-width: 100%;
    }

    .nav-links {
        gap: 16px;
    }

    .specimen-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px 16px;
    }

    .section-header {
        flex-direction: column;
        gap: 6px;
    }

    .plant-detail-header h1 {
        font-size: 1.5rem;
    }

    .island-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 48px 0 36px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .nav-inner {
        padding: 0 14px;
    }

    .nav-links {
        gap: 12px;
        font-size: 0.82rem;
    }

    .nav-brand {
        font-size: 1rem;
    }

    .container {
        padding: 28px 0;
    }

    .plant-card-name {
        font-size: 0.95rem;
    }

    .dashboard-stats {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
}