/* CSS Variables für Light/Dark Mode */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-input: #1a1a2e;
    --text-primary: #fff;
    --text-secondary: #aaa;
    --border-color: #333;
    --accent-color: #0078D4;
    --accent-hover: #006cbd;
    --shadow: rgba(0,0,0,0.4);
    --modal-bg: rgba(0,0,0,0.7);
}

[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-input: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --border-color: #e0e0e0;
    --accent-color: #0078D4;
    --accent-hover: #006cbd;
    --shadow: rgba(0,0,0,0.1);
    --modal-bg: rgba(0,0,0,0.5);
}

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

body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 4px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    transition: all 0.2s;
}
.theme-toggle:hover {
    background: var(--accent-color);
    color: #fff;
}

/* Login */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-box {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    width: 100%;
    max-width: 350px;
    box-shadow: 0 4px 12px var(--shadow);
}

.login-box h1 { margin-bottom: 20px; color: var(--accent-color); }
.login-box input {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
}
.login-box button {
    width: 100%;
    padding: 12px;
    margin-top: 16px;
    border: none;
    border-radius: 4px;
    background: var(--accent-color);
    color: #fff;
    cursor: pointer;
    font-size: 16px;
}
.login-box button:hover { background: var(--accent-hover); }
.error { background: #d32f2f; padding: 10px; border-radius: 4px; margin-bottom: 16px; color: #fff; }

/* Header */
header {
    background: var(--bg-secondary);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--accent-color);
    box-shadow: 0 2px 8px var(--shadow);
}
header h1 { font-size: 1.5rem; color: var(--accent-color); }
header nav { display: flex; gap: 16px; align-items: center; }
header nav span { color: var(--text-primary); }
header nav a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background 0.2s;
}
header nav a:hover { background: var(--accent-color); color: #fff; }

/* Tiles Container */
.tiles-container {
    padding: 24px;
    max-width: 1600px;
    margin: 0 auto;
}

.tile-group {
    margin-bottom: 32px;
}

.tile-group h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 3px solid var(--accent-color);
    display: inline-block;
    color: var(--text-primary);
}

.tile-group h2 a:hover {
    color: var(--accent-color);
    transition: color 0.2s;
}

.group-desc {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.tiles {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 12px;
    min-height: 200px;
}

/* Responsive Grid */
@media (max-width: 1200px) {
    .tiles {
        grid-template-columns: repeat(8, 1fr);
    }
}

@media (max-width: 768px) {
    .tiles {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 480px) {
    .tiles {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Tile Sizes */
.tile {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 16px;
    border-radius: 4px;
    text-decoration: none;
    color: #fff;
    transition: transform 0.15s, box-shadow 0.15s;
    position: relative;
    text-align: center;
    min-height: 100px;
    box-shadow: 0 2px 8px var(--shadow);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.tile.has-bg-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.4);
    border-radius: 4px;
    z-index: 0;
}

.tile.has-bg-image {
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.9);
}

.tile:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 24px var(--shadow);
}

.tile-small { grid-column: span 2; min-height: 120px; } /* 2 Spalten */
.tile-medium { grid-column: span 3; min-height: 140px; } /* 3 Spalten */
.tile-large { grid-column: span 4; grid-row: span 2; min-height: 240px; } /* 4 Spalten, 2 Zeilen */
.tile-wide { grid-column: span 6; min-height: 120px; } /* 6 Spalten (halbe Breite) */

.tile-title { font-weight: 700; font-size: 1.1rem; }
.tile-desc { font-size: 0.9rem; opacity: 0.85; margin-top: 4px; white-space: pre-wrap; }

/* Grid Positioning */
.tile[data-grid-row][data-grid-col] {
    grid-row-start: var(--grid-row);
    grid-column-start: var(--grid-col);
}

/* Drag & Drop */
.tile.draggable {
    cursor: move;
    cursor: grab;
}

.tile.draggable:active {
    cursor: grabbing;
}

.tile.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.tiles.drag-mode {
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent calc(100% / 12 - 1px),
        var(--border-color) calc(100% / 12 - 1px),
        var(--border-color) calc(100% / 12)
    ),
    repeating-linear-gradient(
        90deg,
        transparent,
        transparent calc(100% / 12 - 1px),
        var(--border-color) calc(100% / 12 - 1px),
        var(--border-color) calc(100% / 12)
    );
    background-size: 100% 100%;
}

.grid-helper {
    position: absolute;
    border: 2px dashed var(--accent-color);
    background: rgba(0, 120, 212, 0.1);
    pointer-events: none;
    z-index: 999;
}
.tile-info {
    position: absolute;
    top: 6px;
    right: 8px;
    font-size: 14px;
    cursor: pointer;
    opacity: 0.7;
}
.tile-info:hover { opacity: 1; }

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: var(--modal-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal[hidden] {
    display: none;
}
.modal-content {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 8px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 8px 32px var(--shadow);
}
.modal-content h3 { margin-bottom: 16px; color: var(--text-primary); }
.modal-content pre {
    background: var(--bg-input);
    padding: 12px;
    border-radius: 4px;
    white-space: pre-wrap;
    margin-bottom: 16px;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.modal-content button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    background: var(--accent-color);
    color: #fff;
    cursor: pointer;
}
.modal-content button:hover { background: var(--accent-hover); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px;
    color: var(--text-secondary);
}
.btn {
    display: inline-block;
    padding: 12px 24px;
    background: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 16px;
}
.btn:hover { background: var(--accent-hover); }

/* Manage Page */
.manage { padding: 24px; max-width: 1200px; margin: 0 auto; }
.panel {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px var(--shadow);
}
.panel h2 { margin-bottom: 16px; color: var(--accent-color); }

.message {
    background: var(--accent-color);
    padding: 12px;
    border-radius: 4px;
    margin-bottom: 16px;
    color: #fff;
}

.form-inline {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 8px;
}
.form-grid textarea { grid-column: span 2; }

input, select, textarea {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
}

input[type="color"] { width: 50px; padding: 2px; cursor: pointer; }

/* Color Picker Palette */
.color-picker-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-palette {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
}

.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.color-swatch:hover {
    border-color: var(--accent-color);
    transform: scale(1.1);
}

.color-swatch.selected {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent-color);
}

button {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    background: var(--accent-color);
    color: #fff;
    cursor: pointer;
}
button:hover { background: var(--accent-hover); }

table {
    width: 100%;
    border-collapse: collapse;
}
table th, table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}
table input, table select { width: 100%; }

.links-table { font-size: 0.9rem; }
.links-table input, .links-table select { font-size: 0.85rem; padding: 6px; }

/* Categories Overview */
.categories-overview {
    padding: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.categories-overview h2 {
    font-size: 2rem;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.category-card {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 8px var(--shadow);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 20px var(--shadow);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.category-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: 0;
}

.category-count {
    background: var(--accent-color);
    color: #fff;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
}

.category-card .category-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Category Detail Page */
.category-detail {
    padding: 24px;
    max-width: 1600px;
    margin: 0 auto;
}

.category-header-detail {
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: 8px;
    border-left: 6px solid var(--accent-color);
    margin-bottom: 32px;
    box-shadow: 0 2px 8px var(--shadow);
}

.category-header-detail h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.category-header-detail .category-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 16px;
    line-height: 1.6;
}

.category-header-detail .link-count {
    display: inline-block;
    background: var(--accent-color);
    color: #fff;
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Edit Note Form */
.edit-note-form label {
    display: block;
    margin-top: 12px;
    margin-bottom: 4px;
    font-weight: 600;
    color: var(--text-primary);
}

.edit-note-form input[type="text"],
.edit-note-form input[type="url"],
.edit-note-form input[type="number"],
.edit-note-form select,
.edit-note-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-input);
    color: var(--text-primary);
}

.edit-note-form textarea {
    resize: vertical;
    font-family: 'Segoe UI', Tahoma, sans-serif;
}

.edit-note-form button {
    flex: 1;
}

@media (max-width: 768px) {
    .tiles { grid-template-columns: repeat(2, 1fr); }
    .tile-large, .tile-wide { grid-column: span 2; }
    header { flex-direction: column; gap: 12px; }
    .category-grid { grid-template-columns: 1fr; }
}