@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700&family=Noto+Serif+TC:wght@400;600;700&family=Playfair+Display:wght@400;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-primary: #1a1a1f;
    --bg-secondary: #232329;
    --bg-elevated: #2a2a32;
    --bg-hover: #3d3d48;
    --bg-code: #16161a;

    --text-primary: #e8e6e3;
    --text-secondary: #9a9a9a;
    --text-muted: #6b6b6b;

    --accent-primary: #e07c4c;
    --accent-secondary: #7c9eb2;
    --accent-success: #7cb07c;

    --border-color: #3a3a44;
    --border-light: #2e2e38;

    --font-serif: 'Playfair Display', 'Noto Serif TC', Georgia, serif;
    --font-sans: 'Noto Sans TC', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, monospace;

    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 64px;

    --radius-s: 4px;
    --radius-m: 8px;
    --radius-l: 12px;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-secondary);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-l);
}

/* ========== HEADER ========== */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-l) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.blog-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
}

.blog-title-icon {
    width: 32px;
    height: 32px;
    fill: var(--accent-primary);
}

.blog-nav {
    display: flex;
    gap: var(--spacing-l);
}

.blog-nav a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.blog-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-normal);
}

.blog-nav a:hover {
    color: var(--text-primary);
}

.blog-nav a:hover::after {
    width: 100%;
}

/* ========== MAIN CONTENT ========== */
.main-content {
    flex: 1;
    padding: var(--spacing-xxl) 0;
}

/* ========== HERO SECTION ========== */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    padding: var(--spacing-xxl) 0;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-m);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* ========== DASHBOARD GRID ========== */
.dashboard {
    display: grid;
    grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}

.calendar-wrapper {
    min-width: 0;
}

.post-section {
    min-width: 0;
    overflow-wrap: break-word;
}

/* ========== CALENDAR ========== */
.calendar-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-l);
    padding: var(--spacing-l);
    border: 1px solid var(--border-color);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-l);
}

.calendar-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.calendar-nav {
    display: flex;
    gap: var(--spacing-s);
}

.calendar-nav-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.calendar-nav-btn:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.calendar-nav-btn:active {
    transform: scale(0.95);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.calendar-weekday {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: var(--spacing-s) 0;
    font-family: var(--font-mono);
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-s);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    position: relative;
    gap: 2px;
}

.calendar-day:hover:not(.empty):not(.other-month) {
    background-color: var(--bg-hover);
}

.calendar-day.other-month {
    color: var(--text-muted);
    cursor: default;
}

.calendar-day.today {
    border: 1px solid var(--accent-primary);
}

.calendar-day.selected {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.calendar-day.selected:hover {
    background-color: var(--accent-primary);
}

.calendar-day.has-post::after {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--accent-success);
    position: absolute;
    bottom: 4px;
}

.calendar-day.selected.has-post::after {
    background-color: var(--bg-primary);
}

.calendar-day.empty {
    cursor: default;
}

.calendar-legend {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-m);
    margin-top: var(--spacing-m);
    padding-top: var(--spacing-m);
    border-top: 1px solid var(--border-light);
}

.calendar-legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.calendar-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.calendar-legend-dot.has-post {
    background-color: var(--accent-success);
}

/* ========== SIDEBAR ========== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-l);
}

.sidebar-section {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-l);
    padding: var(--spacing-l);
    border: 1px solid var(--border-color);
    min-width: 0;
}

.sidebar-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-m);
    padding-bottom: var(--spacing-m);
    border-bottom: 1px solid var(--border-light);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-s);
    overflow-wrap: break-word;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-m);
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    border-radius: 20px;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.tag:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.tag.active {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-m);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-m);
    background-color: var(--bg-elevated);
    border-radius: var(--radius-m);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ========== POST LIST ========== */
.post-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-l);
}

.post-list-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.filter-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-m);
}

.filter-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-m);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.filter-badge-date {
    font-family: var(--font-mono);
    color: var(--accent-primary);
}

.filter-clear {
    padding: var(--spacing-xs) var(--spacing-m);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-clear:hover {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
}

.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-m);
}

.post-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-l);
    padding: var(--spacing-l);
    transition: all var(--transition-normal);
    cursor: pointer;
    min-width: 0;
}

.post-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.post-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-m);
}

.post-card-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    transition: color var(--transition-fast);
    overflow-wrap: break-word;
    word-break: break-word;
    min-width: 0;
}

.post-card:hover .post-card-title {
    color: var(--accent-primary);
}

.post-card-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    margin-left: var(--spacing-m);
}

.post-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-m);
}

.post-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.post-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.post-card-tags .tag {
    padding: 2px var(--spacing-s);
    font-size: 0.75rem;
}

.post-card-arrow {
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.post-card:hover .post-card-arrow {
    color: var(--accent-primary);
    transform: translateX(4px);
}

/* ========== EMPTY STATE ========== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxxl) var(--spacing-l);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    fill: var(--text-muted);
    margin-bottom: var(--spacing-l);
    opacity: 0.5;
}

.empty-state-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-s);
}

.empty-state-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ========== ARTICLE PAGE ========== */
.article-page {
    max-width: 800px;
    margin: 0 auto;
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-s);
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-l);
    transition: color var(--transition-fast);
}

.article-back:hover {
    color: var(--accent-primary);
}

.article-header {
    margin-bottom: var(--spacing-xxl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.article-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-m);
    letter-spacing: -0.02em;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-m);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.article-meta-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
    opacity: 0.7;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-s);
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-primary);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    font-family: var(--font-serif);
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-m);
    line-height: 1.4;
}

.article-content h1 { font-size: 2rem; }
.article-content h2 { font-size: 1.6rem; }
.article-content h3 { font-size: 1.3rem; }
.article-content h4 { font-size: 1.1rem; }

.article-content p {
    margin-bottom: var(--spacing-m);
}

.article-content a {
    color: var(--accent-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content a:hover {
    color: var(--accent-secondary);
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-m);
    padding-left: var(--spacing-xl);
}

.article-content li {
    margin-bottom: var(--spacing-s);
}

.article-content blockquote {
    border-left: 3px solid var(--accent-primary);
    padding-left: var(--spacing-l);
    margin: var(--spacing-l) 0;
    color: var(--text-secondary);
    font-style: italic;
    background-color: var(--bg-secondary);
    padding: var(--spacing-m) var(--spacing-l);
    border-radius: 0 var(--radius-m) var(--radius-m) 0;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--bg-code);
    padding: 2px 6px;
    border-radius: var(--radius-s);
    color: var(--accent-secondary);
}

.article-content pre {
    background-color: var(--bg-code);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-m);
    padding: var(--spacing-l);
    overflow-x: auto;
    margin: var(--spacing-l) 0;
    position: relative;
}

.article-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-m);
    margin: var(--spacing-l) 0;
}

.article-content hr {
    border: none;
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-xxl) 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-l) 0;
}

.article-content th,
.article-content td {
    border: 1px solid var(--border-color);
    padding: var(--spacing-m);
    text-align: left;
}

.article-content th {
    background-color: var(--bg-secondary);
    font-weight: 600;
}

.article-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.article-content em {
    font-style: italic;
}

/* ========== FOOTER ========== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    margin-top: auto;
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: var(--spacing-l);
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-slow) forwards;
}

.post-card {
    opacity: 0;
    animation: fadeIn var(--transition-slow) forwards;
}

.post-card:nth-child(1) { animation-delay: 0ms; }
.post-card:nth-child(2) { animation-delay: 100ms; }
.post-card:nth-child(3) { animation-delay: 200ms; }
.post-card:nth-child(4) { animation-delay: 300ms; }
.post-card:nth-child(5) { animation-delay: 400ms; }
.post-card:nth-child(6) { animation-delay: 500ms; }
.post-card:nth-child(7) { animation-delay: 600ms; }
.post-card:nth-child(8) { animation-delay: 700ms; }
.post-card:nth-child(9) { animation-delay: 800ms; }
.post-card:nth-child(10) { animation-delay: 900ms; }

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

    .calendar-container {
        order: -1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-m);
    }

    .header .container {
        flex-direction: column;
        gap: var(--spacing-m);
    }

    .hero-title {
        font-size: 2rem;
    }

    .dashboard {
        gap: var(--spacing-l);
    }

    .calendar-container {
        padding: var(--spacing-m);
    }

    .calendar-day {
        font-size: 0.75rem;
    }

    .article-title {
        font-size: 1.75rem;
    }

    .post-card-date {
        display: none;
    }

    .footer .container {
        flex-direction: column;
        gap: var(--spacing-m);
        text-align: center;
    }
}

/* ========== LOADING ========== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xxxl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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