/* ═══════════════════════════════════════════════
   个人博客 — 白金 / 黑金 双主题
   ═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Noto+Serif+SC:wght@400;600;700&family=DM+Mono:wght@400;500&display=swap');

/* ─── 主题变量 ──────────────────────────────── */

:root,
[data-theme="light"] {
  --bg:             #FAF9F6;
  --bg-alt:         #F0EDE6;
  --surface:        #FFFFFF;
  --surface-hover:  #F7F5F0;
  --border:         #E8E4DA;
  --text:           #1A1A1A;
  --text-secondary: #5A5650;
  --text-muted:     #9A9490;
  --gold:           #C5A55A;
  --gold-light:     #E0CFA0;
  --gold-dark:      #9B8230;
  --gold-gradient:  linear-gradient(135deg, #B8962E, #D4AF37, #E8D5A3, #D4AF37, #B8962E);
  --shadow-sm:      0 1px 3px rgba(0,0,0,.06);
  --shadow-md:      0 4px 20px rgba(0,0,0,.08);
  --shadow-lg:      0 12px 40px rgba(0,0,0,.12);
  --chat-bg:        #FFFFFF;
  --chat-input-bg:  #F5F3EE;
  --code-bg:        #F0EDE6;
  --scrollbar:      #D4D0C8;
  --scrollbar-hover:#B8B4AC;
  --overlay:        rgba(0,0,0,.3);
}

[data-theme="dark"] {
  --bg:             #080808;
  --bg-alt:         #0E0E0E;
  --surface:        #141414;
  --surface-hover:  #1C1C1C;
  --border:         #2A2520;
  --text:           #F0ECE4;
  --text-secondary: #A09890;
  --text-muted:     #6A6460;
  --gold:           #D4AF37;
  --gold-light:     #E8D5A3;
  --gold-dark:      #9B8230;
  --gold-gradient:  linear-gradient(135deg, #9B8230, #D4AF37, #F0E0A0, #D4AF37, #9B8230);
  --shadow-sm:      0 1px 3px rgba(0,0,0,.3);
  --shadow-md:      0 4px 20px rgba(0,0,0,.4);
  --shadow-lg:      0 12px 40px rgba(0,0,0,.5);
  --chat-bg:        #141414;
  --chat-input-bg:  #1C1C1C;
  --code-bg:        #1C1C1C;
  --scrollbar:      #2A2520;
  --scrollbar-hover:#3A3530;
  --overlay:        rgba(0,0,0,.6);
}

/* ─── Reset & Base ─────────────────────────── */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}

body {
  font-family: 'Noto Serif SC', 'Cormorant Garamond', Georgia, serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  min-height: 100vh;
  transition: background .4s ease, color .4s ease;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

a { color: var(--gold); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--gold-light); }

::selection { background: var(--gold); color: #fff; }

/* grain overlay */
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: .03;
  pointer-events: none;
  z-index: 9999;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ─── Navigation ───────────────────────────── */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  transition: background .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}

.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: .05em;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-family: 'DM Mono', monospace;
  font-size: .8rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color .2s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width .3s ease;
}

.nav-links a:hover { color: var(--gold); }
.nav-links a:hover::after { width: 100%; }

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 38px; height: 38px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: all .3s ease;
}

.theme-toggle:hover {
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 12px color-mix(in srgb, var(--gold) 30%, transparent);
}

/* ─── Hero Section ─────────────────────────── */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 8rem 2rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%; right: -10%;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--gold) 8%, transparent), transparent 70%);
  pointer-events: none;
}

.hero-label {
  font-family: 'DM Mono', monospace;
  font-size: .75rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp .8s ease .2s forwards;
}

.hero-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp .8s ease .4s forwards;
}

.hero-title .gold {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.9;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp .8s ease .6s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-family: 'DM Mono', monospace;
  font-size: .82rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--gold);
  padding: .9rem 2rem;
  border: none;
  cursor: pointer;
  transition: all .3s ease;
  opacity: 0;
  animation: fadeUp .8s ease .8s forwards;
}

.hero-cta:hover {
  background: var(--gold-dark);
  letter-spacing: .14em;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--gold) 35%, transparent);
}

.hero-cta svg {
  width: 16px; height: 16px;
  transition: transform .3s ease;
}
.hero-cta:hover svg { transform: translateX(4px); }

/* decorative line */
.hero-line {
  position: absolute;
  bottom: 0; left: 2rem;
  width: 60px; height: 1px;
  background: var(--gold);
  opacity: .5;
}

/* ─── Section Common ───────────────────────── */

section { padding: 6rem 0; }

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: .8rem;
}

.section-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  margin-bottom: 3rem;
}

/* ─── About ────────────────────────────────── */

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: start;
}

.about-avatar {
  width: 280px; height: 280px;
  border-radius: 2px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.about-avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
}

.about-avatar .placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--text-muted);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  font-size: 1rem;
}

.about-stats {
  display: flex;
  gap: 3rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat-item .stat-number {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--gold);
}

.stat-item .stat-label {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ─── Timeline ─────────────────────────────── */

.timeline {
  position: relative;
  padding-left: 3rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), var(--border));
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all .6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -3rem; top: .5rem;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--gold);
  transform: translateX(-4px);
}

.timeline-date {
  font-family: 'DM Mono', monospace;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: .4rem;
}

.timeline-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: .4rem;
}

.timeline-desc {
  color: var(--text-secondary);
  font-size: .95rem;
}

/* ─── Blog Grid ────────────────────────────── */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all .4s ease;
  cursor: pointer;
  opacity: 0;
  transform: translateY(30px);
}

.blog-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold);
}

.blog-card-image {
  height: 200px;
  background: var(--bg-alt);
  overflow: hidden;
}

.blog-card-image .gradient-placeholder {
  width: 100%; height: 100%;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--gold) 15%, var(--bg)),
    color-mix(in srgb, var(--gold) 5%, var(--bg-alt)));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Cormorant Garamond', serif;
  font-size: 3rem;
  color: var(--gold);
  opacity: .4;
}

.blog-card-body {
  padding: 1.5rem;
}

.blog-card-date {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--gold);
  text-transform: uppercase;
}

.blog-card-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin: .5rem 0;
  line-height: 1.4;
}

.blog-card-excerpt {
  color: var(--text-secondary);
  font-size: .9rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card-readmore {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-top: 1rem;
  font-family: 'DM Mono', monospace;
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--gold);
}

.blog-card-readmore svg { width: 14px; height: 14px; transition: transform .2s; }
.blog-card:hover .blog-card-readmore svg { transform: translateX(4px); }

/* ─── Footer ───────────────────────────────── */

.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-family: 'DM Mono', monospace;
  font-size: .75rem;
  letter-spacing: .05em;
  color: var(--text-muted);
}

.footer .gold-text {
  color: var(--gold);
}

/* ─── Chat Widget ──────────────────────────── */

.chat-fab {
  position: fixed;
  bottom: 2rem; right: 2rem;
  z-index: 200;
  width: 56px; height: 56px;
  border-radius: 50%;
  border: none;
  background: var(--gold-gradient);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px color-mix(in srgb, var(--gold) 40%, transparent);
  transition: all .3s ease;
  animation: fabPulse 3s ease infinite;
}

.chat-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 30px color-mix(in srgb, var(--gold) 50%, transparent);
  animation: none;
}

.chat-fab svg { width: 24px; height: 24px; }

.chat-fab.open svg.icon-chat { display: none; }
.chat-fab:not(.open) svg.icon-close { display: none; }

@keyframes fabPulse {
  0%, 100% { box-shadow: 0 4px 20px color-mix(in srgb, var(--gold) 40%, transparent); }
  50% { box-shadow: 0 4px 30px color-mix(in srgb, var(--gold) 60%, transparent); }
}

/* Chat Panel */
.chat-panel {
  position: fixed;
  bottom: 6.5rem; right: 2rem;
  z-index: 201;
  width: 400px;
  max-height: 560px;
  background: var(--chat-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px) scale(.95);
  opacity: 0;
  pointer-events: none;
  transition: all .35s cubic-bezier(.4, 0, .2, 1);
}

.chat-panel.open {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: all;
}

.chat-header {
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.chat-header-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.1rem;
  font-weight: 600;
}

.chat-header-badge {
  font-family: 'DM Mono', monospace;
  font-size: .65rem;
  letter-spacing: .05em;
  color: var(--gold);
  background: color-mix(in srgb, var(--gold) 10%, transparent);
  padding: .2rem .5rem;
  border-radius: 4px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-msg {
  max-width: 85%;
  padding: .8rem 1rem;
  border-radius: 10px;
  font-size: .9rem;
  line-height: 1.7;
  word-break: break-word;
}

.chat-msg.user {
  align-self: flex-end;
  background: var(--gold);
  color: #fff;
  border-bottom-right-radius: 2px;
}

.chat-msg.assistant {
  align-self: flex-start;
  background: var(--surface-hover);
  color: var(--text);
  border-bottom-left-radius: 2px;
}

.chat-msg.system {
  align-self: center;
  text-align: center;
  font-size: .78rem;
  color: var(--text-muted);
  max-width: 100%;
}

.chat-typing {
  display: flex;
  gap: 4px;
  padding: .8rem 1rem;
  align-self: flex-start;
}

.chat-typing span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
  opacity: .4;
  animation: typingDot 1.4s ease infinite;
}

.chat-typing span:nth-child(2) { animation-delay: .2s; }
.chat-typing span:nth-child(3) { animation-delay: .4s; }

@keyframes typingDot {
  0%, 60%, 100% { opacity: .4; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}

.chat-input-area {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: .6rem;
  flex-shrink: 0;
}

.chat-input {
  flex: 1;
  padding: .7rem 1rem;
  background: var(--chat-input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: .9rem;
  outline: none;
  transition: border-color .2s;
}

.chat-input:focus { border-color: var(--gold); }

.chat-send {
  width: 40px; height: 40px;
  border-radius: 8px;
  border: none;
  background: var(--gold);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  flex-shrink: 0;
}

.chat-send:hover { background: var(--gold-dark); }
.chat-send:disabled { opacity: .4; cursor: not-allowed; }

.chat-send svg { width: 18px; height: 18px; }

/* ─── Animations ───────────────────────────── */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all .7s cubic-bezier(.4, 0, .2, 1);
}

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

/* ─── Responsive ───────────────────────────── */

@media (max-width: 768px) {
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: .7rem; }
  .hero { padding: 6rem 1.5rem 3rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-avatar { width: 200px; height: 200px; margin: 0 auto; }
  .about-stats { justify-content: center; }
  .blog-grid { grid-template-columns: 1fr; }
  .chat-panel { right: 1rem; left: 1rem; bottom: 6rem; width: auto; max-height: 70vh; }
  .chat-fab { right: 1.5rem; bottom: 1.5rem; }
  .container { padding: 0 1.5rem; }
}