/* ============================================================
   CSS Variables / Theme
   ============================================================ */
:root {
    --bg: #f5f7fa;
    --bg-card: rgba(255,255,255,0.92);
    --bg-glass: rgba(255,255,255,0.75);
    --text: #2d3748;
    --text-secondary: #5a6c7d;
    --text-muted: #8ca3b9;
    --border: rgba(168,216,234,0.3);
    --shadow: 0 8px 30px rgba(100,130,180,0.12);
    --shadow-hover: 0 16px 48px rgba(100,130,180,0.2);
    --gradient-1: linear-gradient(135deg, #a8d8ea 0%, #8bc6e0 100%);
    --gradient-2: linear-gradient(135deg, #ffb6c1 0%, #ff9eb5 100%);
    --gradient-hero: linear-gradient(135deg, #e8f0f8 0%, #fdf0f2 100%);
    --accent: #6a8caf;
    --accent-light: #a8c6df;
    --pink: #ffb6c1;
    --blue: #a8d8ea;
    --nav-bg: rgba(255,255,255,0.85);
    --code-bg: #f0f4f8;
    --tag-bg: rgba(168,216,234,0.2);
    --tag-color: #5a8caf;
    --scrollbar: #d0dce8;
}

.dark {
    --bg: #0f1724;
    --bg-card: rgba(25,35,50,0.92);
    --bg-glass: rgba(20,30,45,0.8);
    --text: #e2e8f0;
    --text-secondary: #a0b4c8;
    --text-muted: #6a7d94;
    --border: rgba(100,140,180,0.2);
    --shadow: 0 8px 30px rgba(0,0,0,0.3);
    --shadow-hover: 0 16px 48px rgba(0,0,0,0.45);
    --gradient-hero: linear-gradient(135deg, #0f1724 0%, #1a2a3a 100%);
    --accent: #8bc6e0;
    --accent-light: #6a8caf;
    --nav-bg: rgba(15,23,36,0.9);
    --code-bg: #1a2a3a;
    --tag-bg: rgba(100,140,180,0.2);
    --tag-color: #8bc6e0;
    --scrollbar: #2a3a4a;
}

/* ============================================================
   Reset & Base
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
    min-height: 100vh;
    overflow-x: hidden;
}

::selection {
    background: var(--pink);
    color: white;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 4px; }

a {
    color: inherit;
    text-decoration: none;
}

/* ============================================================
   Navigation
   ============================================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s, border-color 0.3s;
}

.nav-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.nav-brand i {
    font-size: 1.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.2s;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-link:hover {
    color: var(--accent);
    background: var(--tag-bg);
}

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

.theme-toggle {
    background: var(--tag-bg);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--accent);
    font-size: 1rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--border);
    transform: scale(1.05);
}

/* ============================================================
   Main Container
   ============================================================ */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    padding: 120px 0 60px;
    background: var(--gradient-hero);
    transition: background 0.3s;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(168,216,234,0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,182,193,0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-avatar {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
    box-shadow: 0 8px 24px rgba(168,216,234,0.3);
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 12px;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================================
   Blog Posts
   ============================================================ */
.posts-section {
    padding: 48px 0;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--pink);
}

.posts-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.post-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.post-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0;
    transition: opacity 0.3s;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.post-card:hover::before {
    opacity: 1;
}

.post-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 16px;
}

.post-card-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.4;
    flex: 1;
}

.post-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    padding-top: 4px;
}

.post-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.post-card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 500;
    background: var(--tag-bg);
    color: var(--tag-color);
    transition: all 0.2s;
}

.tag i {
    font-size: 0.7rem;
}

.post-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s;
}

.post-card:hover .read-more {
    gap: 10px;
}

/* ============================================================
   Search Bar
   ============================================================ */
.search-bar {
    position: relative;
    margin-bottom: 28px;
}

.search-bar input {
    width: 100%;
    padding: 14px 20px 14px 48px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.search-bar input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(106,140,175,0.15);
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.search-bar i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
}

.search-no-results {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.search-no-results i {
    font-size: 2.5rem;
    margin-bottom: 12px;
    display: block;
}

/* ============================================================
   Back to Top
   ============================================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--gradient-2);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: 0 6px 20px rgba(255,158,181,0.3);
    transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(255,158,181,0.4);
}

/* ============================================================
   Article Detail View
   ============================================================ */
.article-view {
    display: block;
    padding: 100px 0 60px;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 10px;
    background: var(--tag-bg);
    border: none;
    font-family: inherit;
    transition: all 0.2s;
    margin-bottom: 24px;
}

.article-back:hover {
    background: var(--border);
    transform: translateX(-4px);
}

.article-header {
    margin-bottom: 32px;
}

.article-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
    line-height: 1.3;
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
    flex-wrap: wrap;
}

.article-meta i {
    margin-right: 4px;
}

.article-content {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.article-content p {
    margin-bottom: 16px;
}

.article-content h2 {
    font-size: 1.5rem;
    color: var(--text);
    margin: 32px 0 16px;
}

.article-content h3 {
    font-size: 1.2rem;
    color: var(--text);
    margin: 24px 0 12px;
}

.article-content pre {
    background: var(--code-bg);
    border-radius: 12px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid var(--border);
}

.article-content code {
    font-family: 'Fira Code', 'Cascadia Code', Consolas, monospace;
    font-size: 0.85rem;
}

.article-content :not(pre) > code {
    background: var(--tag-bg);
    padding: 2px 8px;
    border-radius: 6px;
    color: var(--accent);
}

.article-content img {
    max-width: 100%;
    border-radius: 12px;
    margin: 20px 0;
}

.article-content blockquote {
    border-left: 4px solid var(--gradient-2);
    padding: 12px 20px;
    margin: 20px 0;
    background: var(--tag-bg);
    border-radius: 0 12px 12px 0;
    color: var(--text-secondary);
}

.article-content ul, .article-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
}

.article-content li {
    margin-bottom: 8px;
}

/* ============================================================
   Game Embed
   ============================================================ */
.game-wrapper {
    margin: 32px 0;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: background 0.3s;
}

/* ============================================================
   About View
   ============================================================ */
.about-view {
    display: none;
    padding: 100px 0 60px;
    animation: fadeIn 0.4s ease;
}

.about-view.active {
    display: block;
}

#homeView {
    display: block;
    animation: fadeIn 0.4s ease;
}

#homeView.hidden {
    display: none;
}

.about-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 36px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.about-card h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.about-card h2 i {
    color: var(--pink);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
    margin-bottom: 16px;
}

.about-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}

.about-skill {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--tag-bg);
    color: var(--tag-color);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
    transition: border-color 0.3s;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--tag-bg);
    color: var(--accent);
    font-size: 1.3rem;
    transition: all 0.3s;
    text-decoration: none;
}

.footer-social a:hover {
    background: var(--gradient-2);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255,158,181,0.3);
}

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

/* ============================================================
   Reading Progress
   ============================================================ */
.reading-progress {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 999;
    background: transparent;
}

.reading-progress-bar {
    height: 100%;
    background: var(--gradient-2);
    width: 0%;
    transition: width 0.1s linear;
    border-radius: 0 2px 2px 0;
}

/* ============================================================
   Scroll Reveal (Intersection Observer)
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Article Loading
   ============================================================ */
.article-loading {
    text-align: center;
    padding: 80px 0;
    color: var(--text-muted);
}

.article-loading i {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.article-loading p {
    font-size: 0.95rem;
}

/* ============================================================
   404 Page
   ============================================================ */
.error-container {
    min-height: calc(100vh - 64px - 120px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 24px 60px;
}

.error-code {
    font-size: 6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1;
    margin-bottom: 8px;
}

.error-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.error-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.error-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    max-width: 420px;
    margin-bottom: 28px;
}

.error-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 12px;
    background: var(--gradient-1);
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(168,216,234,0.3);
}

.error-back:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(168,216,234,0.4);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
    .hero { padding: 100px 0 40px; }
    .hero h1 { font-size: 1.8rem; }
    .post-card { padding: 20px; }
    .post-card-title { font-size: 1.1rem; }
    .article-title { font-size: 1.5rem; }
    .about-card { padding: 24px; }
    .nav-inner { padding: 0 16px; }
    .nav-links { gap: 6px; }
    .nav-link { padding: 6px 10px; }
    .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.5rem; }
    .hero p { font-size: 0.9rem; }
    .post-card-header { flex-direction: column; gap: 4px; }
    .post-card-date { white-space: normal; }
    .back-to-top { bottom: 16px; right: 16px; width: 36px; height: 36px; font-size: 0.9rem; }
}