:root {
  --bg: #fff9f6;
  --bg-card: #ffffff;
  --bg-elevated: #f4f8ff;
  --bg-warm: #fff5ee;
  --text: #1a2030;
  --text-secondary: #3d4555;
  --text-muted: #6b7385;
  --primary: #ff5c5c;
  --primary-dark: #e84545;
  --primary-soft: rgba(255, 92, 92, 0.1);
  --secondary: #3d9eff;
  --secondary-soft: rgba(61, 158, 255, 0.1);
  --accent: #ff9f43;
  --accent-soft: rgba(255, 159, 67, 0.12);
  --mint: #2ecfb4;
  --mint-soft: rgba(46, 207, 180, 0.1);
  --violet: #8b7cf7;
  --violet-soft: rgba(139, 124, 247, 0.1);
  --border: rgba(26, 32, 48, 0.08);
  --shadow: 0 4px 20px rgba(61, 158, 255, 0.06);
  --shadow-hover: 0 12px 40px rgba(255, 92, 92, 0.12);
  --font-serif: "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 14px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0.02em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.header--scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 2px 16px rgba(61, 158, 255, 0.1);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo__icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 900;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(255, 92, 92, 0.3);
}

.logo__content {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.2;
}

.logo__name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.06em;
}

.logo__sub {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.12em;
}

.nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 4px;
  background: rgba(244, 248, 255, 0.85);
  border: 1px solid var(--border);
  border-radius: 50px;
}

.nav__link {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.45rem 0.95rem;
  border-radius: 50px;
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--primary-dark);
  background: rgba(255, 255, 255, 0.9);
}

.nav__link.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #ff7b54);
  box-shadow: 0 2px 10px rgba(255, 92, 92, 0.3);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.header__cta {
  font-size: 0.84rem;
  font-weight: 600;
  color: #fff;
  padding: 0.5rem 1.15rem;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--secondary), #5eb0ff);
  box-shadow: 0 3px 12px rgba(61, 158, 255, 0.3);
  transition: transform 0.2s, box-shadow 0.2s;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.header__cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(61, 158, 255, 0.4);
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 8px;
}

.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 500px at 85% 15%, rgba(61, 158, 255, 0.18), transparent),
    radial-gradient(circle 450px at 10% 75%, rgba(255, 92, 92, 0.14), transparent),
    radial-gradient(circle 350px at 55% 55%, rgba(255, 159, 67, 0.1), transparent),
    radial-gradient(circle 300px at 25% 20%, rgba(46, 207, 180, 0.12), transparent),
    linear-gradient(165deg, #ffffff 0%, #fff9f6 45%, #f4f8ff 100%);
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle 2px at center, rgba(61, 158, 255, 0.15) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at 50% 40%, black 10%, transparent 65%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 4rem 0 6rem;
  max-width: 740px;
}

.hero__tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--primary-dark);
  border: 1px solid rgba(255, 92, 92, 0.25);
  background: linear-gradient(135deg, var(--primary-soft), var(--accent-soft));
  padding: 0.4rem 1.1rem;
  border-radius: 100px;
  margin-bottom: 1.75rem;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 5.5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  background: linear-gradient(120deg, #1a2030 0%, #1a2030 40%, var(--primary) 75%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 2.75rem;
  font-weight: 400;
  line-height: 1.85;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: linear-gradient(135deg, #ff6b6b, #ff5757 50%, #ff9f43);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 92, 92, 0.35);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(255, 92, 92, 0.4);
}

.btn--outline {
  border: 2px solid rgba(61, 158, 255, 0.35);
  color: var(--secondary);
  background: rgba(255, 255, 255, 0.8);
}

.btn--outline:hover {
  border-color: var(--secondary);
  color: #fff;
  background: linear-gradient(135deg, var(--secondary), #5eb0ff);
  box-shadow: 0 8px 24px rgba(61, 158, 255, 0.3);
}

.btn--full {
  width: 100%;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
}

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

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section__header {
  margin-bottom: 3rem;
}

.section__header--center {
  text-align: center;
}

.section__label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 0.85rem;
  padding: 0.3rem 0.9rem;
  background: var(--secondary-soft);
  border-radius: 100px;
}

.section__header--center .section__label {
  display: inline-block;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text);
  line-height: 1.35;
}

.section__subtitle {
  margin-top: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
  font-size: 1.02rem;
  line-height: 1.8;
}

/* About */
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about__text p {
  color: var(--text-muted);
  margin-bottom: 1.35rem;
  font-weight: 400;
  line-height: 1.85;
}

.about__text p:first-child {
  color: var(--text-secondary);
  font-size: 1.08rem;
  font-weight: 500;
  line-height: 1.9;
}

.about__stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  border-left: 4px solid var(--primary);
}

.stat:nth-child(2) {
  border-left-color: var(--secondary);
}

.stat:nth-child(3) {
  border-left-color: var(--mint);
}

.stat:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-hover);
}

.stat__num {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.3rem;
  letter-spacing: 0.02em;
}

.stat:nth-child(1) .stat__num { color: var(--primary-dark); }
.stat:nth-child(2) .stat__num { color: var(--secondary); }
.stat:nth-child(3) .stat__num { color: var(--mint); }

.stat__label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Services */
.services {
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.service-card:nth-child(1)::before { background: linear-gradient(90deg, var(--primary), #ff8a8a); }
.service-card:nth-child(2)::before { background: linear-gradient(90deg, var(--secondary), #7ec0ff); }
.service-card:nth-child(3)::before { background: linear-gradient(90deg, var(--accent), #ffc46b); }
.service-card:nth-child(4)::before { background: linear-gradient(90deg, var(--mint), #6ee7d4); }

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.service-card__icon {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 900;
  margin-bottom: 1.1rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}

.service-card:nth-child(1) .service-card__icon {
  color: var(--primary);
  background: var(--primary-soft);
}

.service-card:nth-child(2) .service-card__icon {
  color: var(--secondary);
  background: var(--secondary-soft);
}

.service-card:nth-child(3) .service-card__icon {
  color: var(--accent);
  background: var(--accent-soft);
}

.service-card:nth-child(4) .service-card__icon {
  color: var(--mint);
  background: var(--mint-soft);
}

.service-card h3 {
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
  color: var(--text);
  letter-spacing: 0.02em;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.75;
}

/* Works */
.works__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.work-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}

.work-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.work-card__cover {
  height: 210px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 1.1rem;
}

.work-card__cover--1 {
  background: linear-gradient(145deg, #ff8a8a 0%, #ff6b9d 45%, #c084fc 100%);
}

.work-card__cover--2 {
  background: linear-gradient(145deg, #6eb5ff 0%, #3d9eff 45%, #2ecfb4 100%);
}

.work-card__cover--3 {
  background: linear-gradient(145deg, #ffc46b 0%, #ff9f43 45%, #ff6b6b 100%);
}

.work-card__cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26, 32, 48, 0.2), transparent 55%);
}

.work-card__badge {
  position: relative;
  z-index: 1;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-secondary);
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.work-card__body {
  padding: 1.35rem 1.5rem 1.6rem;
}

.work-card__body h3 {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 0.55rem;
  color: var(--text);
  letter-spacing: 0.02em;
}

.work-card__body p {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.75;
}

/* Contact */
.contact__box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  background: linear-gradient(135deg, #ffffff 0%, #f8fbff 60%, #fff5f5 100%);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 3rem;
  box-shadow: var(--shadow);
}

.contact__info .section__label {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.contact__info p {
  color: var(--text-muted);
  margin: 1rem 0 2rem;
  font-weight: 400;
  line-height: 1.85;
}

.contact__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.contact__list li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.contact__list strong {
  font-size: 0.78rem;
  color: var(--secondary);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contact__list span {
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 1.1rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 400;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px var(--secondary-soft);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(107, 115, 133, 0.5);
  font-weight: 400;
}

.form-tip {
  font-size: 0.88rem;
  text-align: center;
  min-height: 1.2em;
  font-weight: 500;
}

.form-tip--success {
  color: var(--mint);
}

/* Footer */
.footer {
  padding: 2.25rem 0;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, #fff 0%, #fff9f6 100%);
  text-align: center;
}

.footer p {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 400;
}

.footer__sub {
  margin-top: 0.4rem;
  font-size: 0.82rem !important;
  color: var(--secondary);
  opacity: 0.85;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 900px) {
  .header__inner {
    gap: 1rem;
  }

  .nav {
    flex: none;
    position: fixed;
    top: calc(var(--header-h) + 8px);
    left: 4vw;
    right: 4vw;
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-hover);
    transform: translateY(-130%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    pointer-events: none;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    text-align: center;
    padding: 0.7rem 1rem;
  }

  .header__cta {
    display: none;
  }

  .menu-btn {
    display: flex;
  }

  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .works__grid {
    grid-template-columns: 1fr;
  }

  .about__grid,
  .contact__box {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .logo__sub {
    display: none;
  }

  .services__grid {
    grid-template-columns: 1fr;
  }

  .hero__scroll {
    display: none;
  }

  .contact__box {
    padding: 2rem 1.5rem;
  }

  .hero__title {
    font-size: clamp(1.85rem, 8vw, 2.5rem);
  }
}