/* ============================================
   构成主义 × 二次元 — 唯美静态站模板
   Constructivism × Anime Aesthetic Template
   ============================================ */

/* ----- CSS Variables ----- */
:root {
  --bg: #0a0a0f;
  --surface: rgba(18, 18, 30, 0.88);
  --surface-hover: rgba(24, 24, 40, 0.92);
  --border: rgba(255, 255, 255, 0.07);
  --border-active: rgba(255, 255, 255, 0.14);

  --red: #e63946;
  --red-dim: rgba(230, 57, 70, 0.15);
  --pink: #ff6b9d;
  --pink-dim: rgba(255, 107, 157, 0.12);
  --cyan: #00d4ff;
  --cyan-dim: rgba(0, 212, 255, 0.08);
  --gold: #ffd700;
  --gold-dim: rgba(255, 215, 0, 0.1);

  --text: #e8e8ec;
  --text-dim: rgba(232, 232, 236, 0.55);
  --text-faint: rgba(232, 232, 236, 0.3);

  --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Microsoft YaHei', monospace;
  --font-sans: 'Noto Sans SC', 'Microsoft YaHei', -apple-system, sans-serif;

  --panel-width: 250px;
  --top-height: 60px;
  --bottom-height: 120px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text-dim); text-decoration: none; transition: color 0.25s; }
a:hover { color: var(--pink); }

/* ----- Main Grid ----- */
body {
  display: grid;
  grid-template-columns: var(--panel-width) 1fr var(--panel-width);
  grid-template-rows: var(--top-height) 1fr auto;
  grid-template-areas:
    "top    top    top"
    "empty  center sidebar"
    "bottom bottom bottom";
  gap: 0;
  position: relative;
}

/* ============================================
   Corner Geometric Decorations
   ============================================ */
.corner-deco {
  position: fixed;
  width: 100px;
  height: 100px;
  z-index: 0;
  pointer-events: none;
  color: rgba(255, 255, 255, 0.08);
  transition: color 0.6s;
}
.corner-tl { top: 0; left: 0; }
.corner-tr { top: 0; right: 0; }
.corner-bl { bottom: 0; left: 0; }
.corner-br { bottom: 0; right: 0; }

.corner-deco svg { width: 100%; height: 100%; }
.corner-deco circle { fill: var(--red); opacity: 0.5; }

/* ============================================
   Diagonal Decorative Lines
   ============================================ */
.diagonal-line {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent);
  height: 1px;
  transform-origin: center;
}
.dl-1 { top: 18%; left: -10%; width: 120%; transform: rotate(15deg); }
.dl-2 { top: 62%; left: -10%; width: 120%; transform: rotate(-12deg); }
.dl-3 { top: 38%; left: -10%; width: 120%; transform: rotate(8deg); opacity: 0.5; }
.dl-4 { top: 78%; left: -10%; width: 120%; transform: rotate(-7deg); opacity: 0.5; }

/* ============================================
   Top Bar
   ============================================ */
.top-bar {
  grid-area: top;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 10;
  position: relative;
}

.site-title {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 6px;
  display: flex;
  gap: 4px;
}
.tit-char {
  display: inline-block;
  color: #fff;
}
.tit-char.t2 {
  color: #fff;
}

.clock-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}
.clock-label-wrap {
  display: flex;
  align-items: center;
  position: relative;
}
.clock-label {
  font-size: 10px;
  letter-spacing: 4px;
  color: var(--text-faint);
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  transition: color 0.2s;
}
.clock-label:hover {
  color: #fff;
}
.clock-label.no-seconds {
  color: var(--pink);
}
.clock-display {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 300;
  letter-spacing: 4px;
  background: linear-gradient(135deg, var(--pink), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.top-nav { display: flex; gap: 24px; }
.nav-item {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--text-dim);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}
.nav-item:hover,
.nav-item.active { color: var(--text); border-bottom-color: var(--red); }

/* ============================================
   Side Panels (Left & Right)
   ============================================ */
.side-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 5;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.08) transparent;
}
.left-panel  { grid-area: sidebar; border-left: 1px solid var(--border); }
.empty-panel {
  grid-area: empty;
  border-right: 1px solid var(--border);
  align-items: center;
  gap: 20px;
  padding: 24px 18px;
}

/* ----- Avatar ----- */
.avatar-wrap {
  display: flex;
  justify-content: center;
  flex-shrink: 0;
}
.avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(255,255,255,0.03);
  border: 2px dashed var(--border);
  transition: border-color 0.3s;
}
.avatar:hover {
  border-color: var(--pink);
}

/* ----- Panel Link Items ----- */
.panel-links {
  display: flex;
  flex-direction: row;
  gap: 10px;
  justify-content: center;
}
.panel-link-item {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  transition: all 0.3s;
  cursor: pointer;
}
.panel-link-item:hover {
  border-color: var(--pink);
  background: rgba(255,107,157,0.04);
}

.panel-header { display: flex; align-items: baseline; gap: 8px; }
.panel-icon  { color: var(--red); font-size: 10px; }
.panel-title { font-family: var(--font-mono); font-size: 13px; letter-spacing: 4px; font-weight: 600; }
.panel-sub   { font-size: 10px; color: var(--text-faint); letter-spacing: 2px; }

/* ----- Blog List ----- */
.blog-list { display: flex; flex-direction: column; gap: 12px; }
.blog-card {
  padding: 12px 14px;
  background: rgba(255,255,255,0.02);
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  transition: all 0.3s;
}
.blog-card:hover {
  background: rgba(255,255,255,0.04);
  border-left-color: var(--pink);
}
.blog-date {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 1px;
}
.blog-title {
  font-size: 13px;
  font-weight: 500;
  margin-top: 4px;
  line-height: 1.4;
}
.blog-excerpt {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, margin-top 0.35s ease, opacity 0.35s;
  opacity: 0;
  margin-top: 0;
}
.blog-card.expanded .blog-excerpt {
  max-height: 120px;
  opacity: 1;
  margin-top: 8px;
}
.blog-card.expanded {
  border-left-color: var(--pink);
  background: rgba(255,255,255,0.04);
}

/* ----- Link Groups ----- */
.link-groups { display: flex; flex-direction: column; gap: 20px; }
.link-group { display: flex; flex-direction: column; gap: 2px; }
.link-cat {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--red);
  margin-bottom: 6px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--red-dim);
}
.link-item {
  display: block;
  padding: 5px 10px;
  font-size: 12px;
  border-radius: 3px;
  transition: all 0.25s;
  position: relative;
}
.link-item::before {
  content: '→';
  position: absolute;
  left: -4px;
  opacity: 0;
  transform: translateX(-4px);
  transition: all 0.25s;
  color: var(--pink);
  font-size: 10px;
}
.link-item:hover {
  background: var(--pink-dim);
  color: var(--text);
  padding-left: 20px;
}
.link-item:hover::before {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================
   Center — Constructivist Art
   ============================================ */
.center-art {
  grid-area: center;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.constructivist-svg {
  width: min(80%, 520px);
  height: min(80%, 520px);
  filter: drop-shadow(0 0 60px rgba(230, 57, 70, 0.1));
}

/* SVG animations */
.art-pulse {
  animation: pulse 4s ease-in-out infinite;
}
.art-rotate-slow {
  animation: rotateSlow 30s linear infinite;
  transform-origin: 310px 270px;
}
.art-rotate-rev {
  animation: rotateSlow 20s linear infinite reverse;
  transform-origin: 310px 270px;
}
.art-float {
  animation: float 6s ease-in-out infinite;
}
.art-float-delay {
  animation: float 6s ease-in-out 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}
@keyframes rotateSlow {
  to { transform: rotate(360deg); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Art controls */
.art-controls {
  position: absolute;
  bottom: 24px;
  display: flex;
  gap: 10px;
  background: var(--surface);
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
}
.art-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 10px;
  transition: all 0.3s;
}
.art-btn:hover { color: var(--text); }
.art-btn.active {
  color: var(--red);
  background: var(--red-dim);
}

/* ============================================
   Bottom Bar — Guestbook
   ============================================ */
.bottom-bar {
  grid-area: bottom;
  background: var(--surface);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 10;
  padding: 10px 28px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
}

.guestbook { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 320px; height: 150px; }

/* ----- Bottom Index (moved from sidebar) ----- */
.bottom-index {
  margin-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex-shrink: 0;
  height: 150px;
}
.bottom-index .link-groups {
  flex-direction: row;
  gap: 24px;
}
.bottom-index .link-group {
  flex-direction: column;
  flex-wrap: nowrap;
  gap: 6px;
  width: 100px;
  align-items: flex-start;
}
.bottom-index .link-cat {
  white-space: nowrap;
  margin-bottom: 4px;
  padding-bottom: 4px;
  padding-right: 0;
  border-bottom: 1px solid var(--red-dim);
  border-right: none;
  flex-shrink: 0;
  font-size: 11px;
}
.bottom-index .link-item {
  white-space: nowrap;
  font-size: 11px;
  padding: 3px 6px;
}
.gb-header { display: flex; align-items: baseline; gap: 8px; }
.gb-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 4px;
  font-weight: 600;
}

.gb-form { display: flex; flex-direction: column; gap: 4px; flex: 1; min-height: 0; }
.gb-row { display: flex; gap: 10px; align-items: center; }
.gb-form-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}
.gb-form-row > .gb-textarea {
  flex: 0 0 360px;
}
.gb-form-row .gb-input {
  width: 100%;
}
.gb-form-right {
  flex: 0 0 140px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.gb-form-right .gb-submit {
  width: 100%;
  margin-top: auto;
}
.gb-messages {
  flex: 0 0 360px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px;
  background: rgba(255,255,255,0.015);
  border-radius: 4px;
  border: 1px solid var(--border);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.06) transparent;
  font-size: 11px;
}

.gb-input,
.gb-textarea {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 12px;
  padding: 8px 12px;
  transition: border-color 0.3s, background 0.3s;
  outline: none;
}
.gb-input:focus,
.gb-textarea:focus {
  border-color: var(--pink);
  background: rgba(255,107,157,0.04);
}
.gb-textarea { resize: none; min-height: 60px; }

.gb-actions { max-width: 460px; }
.gb-hint { font-size: 10px; color: var(--text-faint); font-style: italic; }

.gb-submit {
  background: var(--red);
  color: #fff;
  border: none;
  padding: 7px 28px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 3px;
  cursor: pointer;
  transition: all 0.3s;
}
.gb-submit:hover { background: #c62828; transform: translateY(-1px); }

.gb-msg {
  padding: 6px 10px;
  background: rgba(255,255,255,0.02);
  border-radius: 3px;
  font-size: 11px;
  border-left: 2px solid var(--border);
}
.gb-msg-name {
  font-weight: 600;
  color: var(--pink);
  margin-right: 8px;
  font-size: 11px;
}
.gb-msg-time {
  color: var(--text-faint);
  font-size: 10px;
  font-family: var(--font-mono);
  float: right;
}

.footer-info {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 1px;
  width: 100%;
}
.footer-sep { opacity: 0.3; }

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.06); border-radius: 2px; }

/* ============================================
   Responsive — Mobile
   ============================================ */
@media (max-width: 900px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto auto;
    grid-template-areas:
      "top"
      "empty"
      "center"
      "sidebar"
      "bottom";
    overflow-y: auto;
    overflow-x: hidden;
  }

  .top-bar {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    padding: 12px 16px;
  }
  .site-title { font-size: 15px; }
  .clock-display { font-size: 20px; }
  .top-nav { gap: 16px; }

  .side-panel {
    max-height: none;
    border-left: none !important;
    border-right: none !important;
  }
  .left-panel { border-bottom: 1px solid var(--border); }
  .empty-panel { display: none; }

  .constructivist-svg {
    width: min(90%, 320px);
    height: min(90%, 320px);
  }

  .bottom-bar { padding: 14px 16px; flex-direction: column; }
  .gb-form-row { flex-direction: column; flex: auto; }
  .gb-form-right { flex: auto; width: 100%; }
  .gb-messages { flex: auto; max-height: 120px; width: 100%; }
  .gb-form-row { flex-direction: column; }
  .gb-actions { flex-direction: column; align-items: stretch; gap: 8px; }
  .guestbook { min-width: auto; }
  .bottom-index { margin-left: 0; margin-top: 10px; }
  .bottom-index .link-groups { flex-direction: row; flex-wrap: wrap; gap: 14px; }
  .bottom-index .link-group { flex-direction: column; align-items: flex-start; gap: 4px; }
  .bottom-index .link-cat { border-bottom: 1px solid var(--red-dim); padding-bottom: 4px; }

  .corner-deco { width: 60px; height: 60px; }
  .diagonal-line { display: none; }
}