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

:root {
  --color-bg: #fafaf8;
  --color-bg-alt: #f3f1ed;
  --color-bg-dark: #2c2c2a;
  --color-text: #2c2c2a;
  --color-text-light: #6b6b65;
  --color-text-inverse: #fafaf8;
  --color-primary: #8b6f47;
  --color-primary-hover: #735a38;
  --color-primary-light: rgba(139, 111, 71, 0.08);
  --color-border: #e5e2dc;
  --color-card: #ffffff;
  --color-accent: #c4956a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --max-width: 1120px;
  --header-height: 72px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Section ===== */
.section {
  padding: 96px 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.section__header {
  text-align: center;
  margin-bottom: 56px;
}

.section__header--light {
  color: var(--color-text-inverse);
}

.section__title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section__subtitle {
  font-size: 17px;
  color: var(--color-text-light);
  max-width: 480px;
  margin: 0 auto;
}

.section--dark .section__subtitle {
  color: rgba(250, 250, 248, 0.6);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

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

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.3s ease;
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav__logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.nav__logo-sub {
  font-size: 11px;
  color: var(--color-text-light);
  letter-spacing: 0.06em;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav__link {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav__link--cta {
  background: var(--color-primary);
  color: #fff !important;
  margin-left: 8px;
}

.nav__link--cta:hover {
  background: var(--color-primary-hover) !important;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

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

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(139, 111, 71, 0.06) 0%, transparent 50%),
    linear-gradient(225deg, rgba(196, 149, 106, 0.04) 0%, transparent 50%),
    var(--color-bg);
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 80px 24px;
}

.hero__title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  max-width: 700px;
  margin-bottom: 24px;
}

.hero__dot {
  color: var(--color-primary);
  margin: 0 4px;
}

.hero__subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 40px;
}

.hero__cta {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
}

.hero__stats {
  display: flex;
  gap: 48px;
}

.hero__stat {
  display: flex;
  flex-direction: column;
}

.hero__stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero__stat-label {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ===== Services ===== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.service-card--featured {
  border-color: var(--color-primary);
  border-width: 2px;
  position: relative;
}

.service-card--featured::before {
  content: "推荐";
  position: absolute;
  top: -1px;
  right: 32px;
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 0 0 6px 6px;
}

.service-card__icon {
  color: var(--color-primary);
  margin-bottom: 20px;
}

.service-card__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card__desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.service-card__features {
  list-style: none;
  margin-bottom: 20px;
}

.service-card__features li {
  font-size: 14px;
  color: var(--color-text);
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
}

.service-card__features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.service-card__tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: 100px;
  font-weight: 600;
  align-self: flex-start;
}

.services__note {
  margin-top: 32px;
  padding: 16px 20px;
  background: rgba(139, 111, 71, 0.06);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--color-text-light);
}

/* ===== Cases ===== */
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

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

.case-card__media {
  position: relative;
  height: 220px;
  display: flex;
  align-items: flex-end;
  padding: 20px;
  overflow: hidden;
  background: linear-gradient(135deg, #d4c9b8 0%, #b8a88a 100%);
}

.case-card__media--2 {
  background: linear-gradient(135deg, #c8bfb0 0%, #a89880 100%);
}

.case-card__media--3 {
  background: linear-gradient(135deg, #d9cfc4 0%, #c4b49e 100%);
}

.case-card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.case-card__area {
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.35);
  padding: 4px 12px;
  border-radius: 100px;
  backdrop-filter: blur(4px);
}

.case-card__info {
  padding: 20px;
}

.case-card__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.case-card__info p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
}

.case-card__tag {
  font-size: 12px;
  color: var(--color-primary);
  font-weight: 600;
}

.cases__more {
  margin-top: 40px;
  text-align: center;
  font-size: 15px;
  color: var(--color-text-light);
}

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

/* ===== Process ===== */
.process__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.process-step {
  text-align: center;
  padding: 24px;
  position: relative;
}

.process-step__num {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: -12px;
}

.process-step__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.process-step p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== About ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 56px;
  align-items: start;
}

.about__text {
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.8;
}

.about__values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.about__value {
  padding: 20px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: center;
}

.about__value strong {
  display: block;
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.about__value span {
  font-size: 13px;
  color: var(--color-text-light);
}

.about__contact-card {
  background: var(--color-card);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.about__contact-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.about__contact-card > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.about__contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.about__contact-item svg {
  flex-shrink: 0;
  color: var(--color-primary);
}

/* ===== FAQ ===== */
.faq__list {
  max-width: 760px;
  margin: 0 auto;
}

.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  background: var(--color-card);
  transition: border-color 0.2s ease;
}

.faq__item[open] {
  border-color: var(--color-primary);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__arrow {
  flex-shrink: 0;
  color: var(--color-text-light);
  transition: transform 0.3s ease;
  margin-left: 16px;
}

.faq__item[open] .faq__arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq__answer {
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===== Contact ===== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}

.contact__info h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 28px;
}

.contact__channels {
  display: grid;
  gap: 20px;
}

.contact__channel {
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}

.contact__channel-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 4px;
}

.contact__channel-value {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 2px;
}

.contact__channel-note {
  font-size: 13px;
  color: rgba(250, 250, 248, 0.5);
}

/* ===== Form ===== */
.contact__form-wrapper {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 36px 32px;
}

.form__group {
  margin-bottom: 20px;
}

.form__label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: rgba(250, 250, 248, 0.8);
}

.form__input {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  color: var(--color-text-inverse);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease;
  outline: none;
}

.form__input::placeholder {
  color: rgba(250, 250, 248, 0.35);
}

.form__input:focus {
  border-color: var(--color-accent);
}

select.form__input {
  cursor: pointer;
}

select.form__input option {
  color: var(--color-text);
  background: var(--color-card);
}

.form__textarea {
  resize: vertical;
  min-height: 80px;
}

.form__note {
  font-size: 12px;
  color: rgba(250, 250, 248, 0.4);
  text-align: center;
  margin-top: 12px;
}

/* ===== Contact success (微信引导) ===== */
.contact__success {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  text-align: center;
}

.contact__success[hidden] {
  display: none;
}

.contact__success-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: #4a9e5c;
  color: #fff;
  font-size: 28px;
  line-height: 56px;
  text-align: center;
}

.contact__success h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact__success p {
  font-size: 14px;
  color: rgba(250, 250, 248, 0.7);
  margin-bottom: 8px;
}

.contact__wechat-id {
  font-size: 22px !important;
  font-weight: 700;
  color: var(--color-accent) !important;
  letter-spacing: 0.04em;
  margin: 12px 0 !important;
}

.contact__qr {
  width: 160px;
  height: 160px;
  margin: 8px auto 16px;
  border-radius: var(--radius-sm);
  background: #fff;
  object-fit: contain;
}

/* ===== Footer ===== */
.footer {
  background: #1e1e1c;
  color: rgba(250, 250, 248, 0.7);
  padding: 56px 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.footer__brand p {
  font-size: 14px;
  color: rgba(250, 250, 248, 0.5);
}

.footer__links h4 {
  font-size: 14px;
  font-weight: 600;
  color: rgba(250, 250, 248, 0.9);
  margin-bottom: 16px;
}

.footer__links a,
.footer__links p {
  display: block;
  font-size: 14px;
  color: rgba(250, 250, 248, 0.5);
  margin-bottom: 8px;
  transition: color 0.2s ease;
}

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

.footer__bottom {
  padding: 24px 0;
  font-size: 13px;
  text-align: center;
  color: rgba(250, 250, 248, 0.35);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .services__grid,
  .cases__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

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

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

  .about__contact-card {
    position: static;
  }

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

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

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

  .hero__stats {
    gap: 32px;
  }

  .hero__cta {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Mobile nav */
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    background: var(--color-card);
    padding: 96px 32px 32px;
    box-shadow: var(--shadow-lg);
    transition: right 0.3s ease;
    gap: 4px;
    align-items: stretch;
  }

  .nav__menu.show {
    right: 0;
  }

  .nav__link {
    padding: 12px 16px;
    font-size: 16px;
  }

  .nav__link--cta {
    margin-left: 0;
    text-align: center;
    margin-top: 12px;
  }

  .nav__toggle {
    display: flex;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 64px 0;
  }

  .section__title {
    font-size: 26px;
  }

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

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

  .hero__title {
    font-size: 30px;
  }
}