/* ============================================
   bestxiao.asia — 肖建军 Personal Website
   Dark Editorial × Warm Amber Accent
   ============================================ */

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

:root {
  /* Colors */
  --bg-primary: #0c0c14;
  --bg-secondary: #11111d;
  --bg-card: #181825;
  --bg-elevated: #1e1e30;
  --accent: #c9a84c;
  --accent-dim: rgba(201, 168, 76, 0.15);
  --accent-glow: rgba(201, 168, 76, 0.08);
  --text-primary: #e8e6e3;
  --text-secondary: #8a8780;
  --text-muted: #5c5952;
  --border: rgba(201, 168, 76, 0.08);
  --border-light: rgba(201, 168, 76, 0.15);

  /* Typography - 国内系统字体方案 */
  --font-display: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Source Han Sans SC', sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  --font-accent: 'Georgia', 'Times New Roman', 'Songti SC', serif;

  /* Spacing */
  --section-py: clamp(5rem, 12vw, 10rem);
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --max-width: 1200px;

  /* Misc */
  --radius: 12px;
  --transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ----- Subtle Grain Overlay ----- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ========== NAVIGATION ========== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 var(--gutter);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  background: rgba(12, 12, 20, 0.7);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav--scrolled {
  background: rgba(12, 12, 20, 0.92);
  box-shadow: 0 1px 30px rgba(0,0,0,0.3);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.05em;
  position: relative;
}

.nav__logo::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0.3);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav__logo:hover::after {
  transform: scaleX(1);
}

.nav__links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  position: relative;
  transition: color var(--transition);
  text-transform: uppercase;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav__link:hover { color: var(--text-primary); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 24px; height: 1.5px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: var(--transition);
}

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 0 var(--gutter);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 600px 400px at 10% 20%, rgba(201, 168, 76, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 90% 80%, rgba(201, 168, 76, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 300px 300px at 50% 50%, rgba(201, 168, 76, 0.03) 0%, transparent 70%);
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 1px,
    rgba(201, 168, 76, 0.015) 1px,
    rgba(201, 168, 76, 0.015) 2px
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding-top: 80px;
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero__main {
  flex: 1;
  min-width: 0;
}

.hero__featured {
  flex-shrink: 0;
  width: 320px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.7s forwards;
}

/* Toolbox Panel */
.hero__toolbox {
  flex-shrink: 0;
  width: 340px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.75s forwards;
}

.toolbox-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.toolbox-panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, rgba(201,168,76,0.3) 60%, transparent 100%);
}

.toolbox-panel::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.025;
  background-image:
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(201,168,76,0.4) 39px, rgba(201,168,76,0.4) 40px),
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(201,168,76,0.4) 39px, rgba(201,168,76,0.4) 40px);
}

.toolbox-panel__header {
  position: relative;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.toolbox-panel__label {
  font-family: var(--font-accent);
  font-size: 0.65rem;
  color: var(--accent);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.4rem;
}

.toolbox-panel__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
  line-height: 1.3;
}

.toolbox-panel__desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.toolbox-panel__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  position: relative;
  z-index: 1;
}

/* Tool Card */
.tool-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition);
}

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

.tool-card:hover {
  border-color: var(--border-light);
  background: var(--bg-elevated);
  transform: translateX(4px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}

.tool-card--placeholder {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.tool-card--placeholder:hover {
  transform: none;
  border-color: var(--border);
  background: var(--bg-card);
  box-shadow: none;
}

.tool-card--placeholder::before {
  display: none;
}

/* Tool Card Icon */
.tool-card__icon {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.tool-card__icon svg {
  width: 20px;
  height: 20px;
}

.tool-card__icon--webdav {
  background: rgba(100, 180, 255, 0.1);
  color: #64b4ff;
}

.tool-card__icon--todo {
  background: rgba(100, 220, 160, 0.1);
  color: #64dca0;
}

.tool-card__icon--notes {
  background: rgba(220, 160, 100, 0.1);
  color: #dca064;
}

.tool-card__icon--dashboard {
  background: rgba(180, 130, 220, 0.1);
  color: #b482dc;
}

.tool-card:hover .tool-card__icon {
  transform: scale(1.08);
}

/* Tool Card Info */
.tool-card__info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.tool-card__name {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.tool-card__tag {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* Tool Card Status */
.tool-card__status {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.tool-card__status--online {
  background: #4ade80;
  box-shadow: 0 0 8px rgba(74, 222, 128, 0.5);
  animation: statusPulse 2.5s ease-in-out infinite;
}

.tool-card__status--offline {
  background: #555;
}

.tool-card__status--coming {
  background: var(--accent);
  opacity: 0.5;
  animation: statusPulse 3s ease-in-out infinite;
}

/* Tool card entrance animation */
.tool-card {
  opacity: 0;
  transform: translateX(20px);
  animation: toolSlideIn 0.5s ease forwards;
}

.toolbox-panel__grid .tool-card:nth-child(1) { animation-delay: 0.9s; }
.toolbox-panel__grid .tool-card:nth-child(2) { animation-delay: 1.05s; }
.toolbox-panel__grid .tool-card:nth-child(3) { animation-delay: 1.2s; }
.toolbox-panel__grid .tool-card:nth-child(4) { animation-delay: 1.35s; }

@keyframes toolSlideIn {
  to { opacity: 1; transform: translateX(0); }
}

.hero__label {
  font-family: var(--font-accent);
  font-size: clamp(0.8rem, 1.2vw, 1rem);
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 2rem;
}

.hero__title-line {
  display: block;
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.hero__title-line:nth-child(1) { animation-delay: 0.1s; }
.hero__title-line:nth-child(2) { animation-delay: 0.25s; }
.hero__title-line:nth-child(3) { animation-delay: 0.4s; }

.hero__title-line--accent {
  color: var(--accent);
  font-style: italic;
}

.hero__sub {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.8;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.55s forwards;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.85rem 2rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  letter-spacing: 0.02em;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg-primary);
  border: 1px solid var(--accent);
}

.btn--primary:hover {
  background: transparent;
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  opacity: 0;
  animation: fadeIn 1s ease 1.5s forwards;
}

.hero__scroll span {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* Featured Card */
.featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

.featured-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.featured-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 20px 60px rgba(201, 168, 76, 0.15);
}

.featured-card__badge {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.featured-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.featured-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.featured-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.2rem;
  background: var(--accent);
  color: var(--bg-primary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all var(--transition);
}

.featured-card__link:hover {
  background: transparent;
  color: var(--accent);
  transform: translateX(4px);
}

.featured-card__link svg {
  transition: transform var(--transition);
}

.featured-card__link:hover svg {
  transform: translateX(4px);
}

/* ========== SECTION COMMON ========== */
.section {
  padding: var(--section-py) var(--gutter);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__header {
  margin-bottom: 4rem;
}

.section__number {
  font-family: var(--font-accent);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  display: block;
  margin-bottom: 0.75rem;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.section__desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ========== ABOUT ========== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__bio-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.about__bio p {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  font-size: 1rem;
  line-height: 1.8;
}

.about__bio strong {
  color: var(--text-primary);
}

.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-dim);
  border-radius: 100px;
  letter-spacing: 0.02em;
  transition: all var(--transition);
}

.tag:hover {
  background: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-1px);
}

/* Timeline */
.about__timeline-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border-light);
}

.timeline__item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  z-index: 1;
}

.timeline__year {
  font-family: var(--font-accent);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.timeline__content h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0.3rem 0 0.4rem;
}

.timeline__content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== PROJECTS ========== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: default;
  position: relative;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-dim);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.project-card__image {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg, #1a1a2e);
  position: relative;
  overflow: hidden;
}

.project-card__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, var(--bg-card));
}

.project-card__icon {
  width: 48px; height: 48px;
  color: var(--accent);
  opacity: 0.6;
  z-index: 1;
}

.project-card:hover .project-card__icon {
  animation: iconBounce 0.6s ease;
}

.project-card__body {
  padding: 1.5rem;
}

.project-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

.project-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-card__tech span {
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.project-card__link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  margin-bottom: 1rem;
  transition: all var(--transition);
  position: relative;
}

.project-card__link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}

.project-card__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ========== ARTICLES ========== */
.articles__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px;
  height: 0;
  background: var(--accent);
  transition: height var(--transition);
}

.article-card:hover::before {
  height: 100%;
}

.article-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-4px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

.article-card__meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  font-size: 0.8rem;
}

.article-card__date {
  color: var(--text-muted);
}

.article-card__category {
  color: var(--accent);
  letter-spacing: 0.05em;
}

.article-card__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.article-card__excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.2rem;
}

.article-card__link {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition);
  position: relative;
}

.article-card__link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 100%; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition);
}

.article-card__link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ========== CONTACT ========== */
.contact__content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact__text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.contact__link svg {
  width: 20px; height: 20px;
}

.contact__link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--accent-glow);
}

/* ========== FOOTER ========== */
.footer {
  padding: 3rem var(--gutter);
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.footer__tagline {
  font-family: var(--font-accent);
  font-style: italic;
  margin-top: 0.3rem;
  color: var(--text-secondary);
}

.footer__beian {
  margin-top: 0.5rem;
}

.footer__beian a {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* ========== ANIMATIONS ========== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

@keyframes iconBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Scroll reveal animation class */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays for cards */
.projects__grid .fade-up:nth-child(1) { transition-delay: 0.05s; }
.projects__grid .fade-up:nth-child(2) { transition-delay: 0.1s; }
.projects__grid .fade-up:nth-child(3) { transition-delay: 0.15s; }
.projects__grid .fade-up:nth-child(4) { transition-delay: 0.2s; }

.articles__grid .fade-up:nth-child(1) { transition-delay: 0.05s; }
.articles__grid .fade-up:nth-child(2) { transition-delay: 0.1s; }
.articles__grid .fade-up:nth-child(3) { transition-delay: 0.15s; }
.articles__grid .fade-up:nth-child(4) { transition-delay: 0.2s; }

/* ========== RESPONSIVE ========== */
@media (max-width: 900px) {
  .hero__content {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero__featured {
    width: 100%;
    max-width: 400px;
  }

  .hero__toolbox {
    width: 100%;
    max-width: 400px;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .projects__grid,
  .articles__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(12, 12, 20, 0.98);
    padding: 1.5rem var(--gutter);
    gap: 1.2rem;
    border-bottom: 1px solid var(--border);
  }

  .nav__links.active {
    display: flex;
  }

  .nav__toggle {
    display: block;
  }

  .nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero__title-line {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .contact__links {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  :root {
    --section-py: 4rem;
    --gutter: 1.25rem;
  }

  .hero__title-line {
    font-size: 2rem;
  }
}