:root {
    --bg-color: #f4f4f0;
    --card-bg: #ffffff;
    --text-color: #1a1a1a;
    --border-color: #1a1a1a;
    --accent-color: #3b82f6;
    --accent-orange: #f97316;
    --shadow-color: rgba(0, 0, 0, 0.15);
    
    /* Hover 專用色 (淺色模式) */
    --hover-bg: #1a1a1a;
    --hover-text: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e5e5e5;
    --border-color: #404040;
    --accent-color: #60a5fa;
    --accent-orange: #fb923c;
    --shadow-color: rgba(0, 0, 0, 0.5);

    /* Hover 專用色 (深色模式修正) */
    --hover-bg: #e5e5e5;
    --hover-text: #121212;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 2px solid var(--border-color);
    background-color: var(--card-bg);
}

.brand {
    text-decoration: none;
    font-family: monospace;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-color);
}

.accent-text { color: var(--accent-color); }
.accent-dot { color: var(--accent-orange); }

.nav-actions { display: flex; gap: 0.5rem; }

/* 按鈕美化與 Hover 顏色修復 */
.btn-action {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.4rem 0.8rem;
    font-family: monospace;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.85rem;
    transition: background-color 0.2s, color 0.2s;
}

.btn-action:hover {
    background-color: var(--hover-bg);
    color: var(--hover-text);
}

.btn-danger:hover {
    background-color: #ef4444;
    color: #ffffff;
    border-color: #ef4444;
}

/* Hero Section */
.hero-section { margin-bottom: 2rem; }
.page-title { font-size: 2.2rem; margin-bottom: 0.5rem; font-family: monospace; }
.subtitle { color: #888888; font-size: 1rem; }

/* Filter Bar */
.filter-bar { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 2rem; }
.filter-btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.4rem 0.8rem;
    cursor: pointer;
    font-family: monospace;
    transition: all 0.2s;
}

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

.filter-btn.active {
    background-color: var(--border-color);
    color: var(--bg-color);
}

/* Posts Grid */
.posts-grid { display: flex; flex-direction: column; gap: 1.5rem; }
.post-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    padding: 1.5rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 4px 4px 0px var(--border-color);
}

.post-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--border-color);
}

.card-header { display: flex; justify-content: space-between; margin-bottom: 0.5rem; }
.meta-tag {
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    font-family: monospace;
    font-weight: bold;
}
.post-date { font-family: monospace; font-size: 0.85rem; opacity: 0.8; }
.card-title { font-size: 1.4rem; margin-bottom: 0.5rem; color: var(--text-color); }
.card-excerpt { font-size: 0.95rem; opacity: 0.85; margin-bottom: 1rem; color: var(--text-color); }
.card-footer { text-align: right; }
.read-more { font-family: monospace; font-size: 0.85rem; font-weight: bold; color: var(--accent-color); }

/* Article Layout */
.article-wrapper {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    padding: 2.5rem;
    box-shadow: 6px 6px 0px var(--border-color);
}
.article-header { margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px dashed var(--border-color); }
.article-meta { display: flex; gap: 1rem; align-items: center; margin-bottom: 1rem; }
.article-title { font-size: 2rem; line-height: 1.3; }

/* Markdown Typography */
.markdown-body { line-height: 1.8; color: var(--text-color); }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 1.5rem; margin-bottom: 1rem; }
.markdown-body p { margin-bottom: 1.2rem; }
.markdown-body code { background-color: rgba(150, 150, 150, 0.2); padding: 0.2rem 0.4rem; font-family: monospace; }
.markdown-body pre { background-color: #1e1e1e; color: #f8f8f2; padding: 1rem; overflow-x: auto; margin-bottom: 1.2rem; border: 1px solid var(--border-color); }
.markdown-body blockquote { border-left: 4px solid var(--accent-color); padding-left: 1rem; opacity: 0.8; margin-bottom: 1.2rem; }

/* Admin Components */
.admin-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    padding: 2rem;
    margin-bottom: 2rem;
}

.highlight-card {
    border-color: var(--accent-orange);
}

.card-heading {
    font-family: monospace;
    font-size: 1.2rem;
    margin-bottom: 1.2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-family: monospace;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    box-sizing: border-box;
}

.form-control:focus { outline: none; border-color: var(--accent-orange); }
textarea.form-control { resize: vertical; min-height: 160px; }
.form-row { display: flex; gap: 1rem; }
.form-row .form-group { flex: 1; }

.btn-submit {
    background-color: var(--accent-color);
    color: #ffffff;
    border: 2px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    font-family: monospace;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 3px 3px 0px var(--border-color);
    transition: all 0.2s ease;
}

.btn-submit:hover {
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0px var(--border-color);
}

.admin-post-list { display: flex; flex-direction: column; gap: 0.75rem; }
.admin-post-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
}
.admin-post-info { display: flex; flex-direction: column; }
.admin-post-meta { font-family: monospace; font-size: 0.8rem; opacity: 0.7; }
.admin-post-actions { display: flex; gap: 0.5rem; }

/* Footer */
.footer { text-align: center; padding: 2rem; font-family: monospace; font-size: 0.85rem; opacity: 0.7; }