/* =========================================================
   序川影集 CHAPTERFLOW — 高端婚礼摄影工作室官网
   配色：深黑底色 + 低饱和金色点缀
   字体：衬线中文 (Noto Serif SC) + Inter 英文
   风格：极简 · 电影质感 · 宽松字距 · 大面积留白
   ========================================================= */

:root {
  --bg:        #0a0908;   /* 深黑底 */
  --bg-soft:   #121110;   /* 次级背景 */
  --surface:   #171513;   /* 卡片/表单背景 */
  --gold:      #c2a878;   /* 低饱和金色 */
  --gold-soft: #9c855f;
  --gold-dim:  rgba(194, 168, 120, 0.18);
  --text:      #ece8e0;   /* 暖白 */
  --text-dim:  #8a847a;   /* 弱化文字 */
  --line:      rgba(236, 232, 224, 0.08);
  --maxw:      1240px;
  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-weight: 300;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; width: 100%; height: auto; }

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

em {
  font-family: "Inter", sans-serif;
  font-style: normal;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.62em;
  color: var(--text-dim);
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5em;
  font-family: "Inter", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 1.05em 2.4em;
  border: 1px solid var(--gold);
  cursor: pointer;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}
.btn em { color: inherit; opacity: 0.7; font-size: 0.7em; }
.btn--ghost { color: var(--gold); background: transparent; }
.btn--ghost:hover { background: var(--gold); color: var(--bg); }
.btn--solid { color: var(--bg); background: var(--gold); border-color: var(--gold); }
.btn--solid:hover { background: transparent; color: var(--gold); }

/* =========================================================
   导航 NAV
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.5s var(--ease), backdrop-filter 0.5s var(--ease), border-color 0.5s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(10, 9, 8, 0.55);
  backdrop-filter: blur(18px) saturate(120%);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand { display: flex; flex-direction: column; line-height: 1.1; }
.nav__brand-cn { font-size: 1.15rem; letter-spacing: 0.35em; font-weight: 500; }
.nav__brand-en { font-family: "Inter", sans-serif; font-size: 0.6rem; letter-spacing: 0.45em; color: var(--gold); margin-top: 0.25em; }

.nav__links { display: flex; gap: 2.4rem; align-items: center; }
.nav__link {
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  color: var(--text);
  position: relative;
  transition: color 0.3s var(--ease);
}
.nav__link em { display: block; }
.nav__link::after {
  content: "";
  position: absolute; left: 0; bottom: -6px;
  width: 0; height: 1px; background: var(--gold);
  transition: width 0.4s var(--ease);
}
.nav__link:hover { color: var(--gold); }
.nav__link:hover::after { width: 100%; }
.nav__link--cta { color: var(--gold); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.nav__toggle span { width: 26px; height: 1.5px; background: var(--text); transition: 0.3s; }

/* =========================================================
   首屏 HERO
   ========================================================= */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  filter: grayscale(0.25) brightness(0.55);
  transform: scale(1.05);
}
.hero__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,9,8,0.55) 0%, rgba(10,9,8,0.35) 40%, rgba(10,9,8,0.85) 100%);
}
.hero__content { position: relative; z-index: 2; padding: 0 1.5rem; }
.hero__eyebrow {
  font-family: "Inter", sans-serif;
  font-size: 0.72rem; letter-spacing: 0.45em; text-transform: uppercase;
  color: var(--gold); margin-bottom: 2rem;
}
.hero__title {
  font-size: clamp(2.8rem, 8vw, 6rem);
  font-weight: 400;
  letter-spacing: 0.18em;
  line-height: 1.15;
}
.hero__title-en {
  font-family: "Inter", sans-serif;
  font-weight: 300;
  font-size: 0.42em;
  letter-spacing: 0.5em;
  color: var(--text-dim);
  display: block;
  margin-top: 0.8rem;
}
.hero__slogan {
  margin-top: 2.2rem;
  font-size: clamp(1rem, 2.4vw, 1.4rem);
  letter-spacing: 0.32em;
  color: var(--text);
}
.hero__sub {
  margin-top: 1rem;
  font-family: "Inter", sans-serif;
  font-size: 0.85rem; letter-spacing: 0.12em;
  color: var(--text-dim);
}
.hero .btn { margin-top: 3rem; }

.hero__scroll {
  position: absolute; bottom: 2.4rem; left: 50%; transform: translateX(-50%);
  z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 0.8rem;
}
.hero__scroll-line { width: 1px; height: 48px; background: linear-gradient(var(--gold), transparent); }
.hero__scroll-text { font-family: "Inter", sans-serif; font-size: 0.6rem; letter-spacing: 0.4em; color: var(--text-dim); }

/* =========================================================
   通用区块 SECTION
   ========================================================= */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 9rem 2rem;
}
.section--alt { max-width: none; background: var(--bg-soft); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }

.section__head { margin-bottom: 4.5rem; }
.section__eyebrow {
  font-family: "Inter", sans-serif;
  font-size: 0.72rem; letter-spacing: 0.45em; text-transform: uppercase;
  color: var(--gold); margin-bottom: 1.2rem;
}
.section__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 400; letter-spacing: 0.16em;
}
.section__title span {
  font-family: "Inter", sans-serif; font-weight: 300;
  font-size: 0.45em; letter-spacing: 0.3em; color: var(--text-dim);
  margin-left: 0.6em; text-transform: uppercase;
}
.section__lead {
  margin-top: 1.6rem; max-width: 640px;
  color: var(--text-dim); letter-spacing: 0.05em; font-size: 1.02rem;
}

/* =========================================================
   服务 SERVICES
   ========================================================= */
.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service {
  background: var(--bg);
  padding: 3rem 2.4rem;
  display: flex; flex-direction: column;
  min-height: 280px;
  transition: background 0.4s var(--ease);
}
.section--alt .service { background: var(--bg-soft); }
.service:hover { background: var(--surface); }
.service__index {
  font-family: "Inter", sans-serif;
  font-size: 0.8rem; letter-spacing: 0.3em; color: var(--gold);
}
.service__title {
  margin-top: 1.6rem;
  font-size: 1.3rem; font-weight: 500; letter-spacing: 0.08em;
}
.service__title em { display: block; margin-top: 0.5em; }
.service__desc {
  margin-top: 1.2rem; color: var(--text-dim);
  font-size: 0.95rem; letter-spacing: 0.03em; line-height: 1.9;
}
.service--reserved { opacity: 0.78; }
.service__tag {
  margin-top: auto; padding-top: 1.6rem;
  font-family: "Inter", sans-serif; font-size: 0.66rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--gold-soft);
}

/* =========================================================
   作品画廊 WORKS
   ========================================================= */
.filters {
  display: flex; flex-wrap: wrap; gap: 0.8rem; margin-bottom: 3rem;
}
.filter {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-family: "Noto Serif SC", serif;
  font-size: 0.9rem; letter-spacing: 0.12em;
  padding: 0.65em 1.4em; cursor: pointer;
  transition: 0.35s var(--ease);
}
.filter em { display: inline; margin-left: 0.4em; }
.filter:hover { border-color: var(--gold-dim); color: var(--text); }
.filter.is-active { background: var(--gold); color: var(--bg); border-color: var(--gold); }
.filter.is-active em { color: var(--bg); opacity: 0.7; }

.gallery {
  column-count: 3;
  column-gap: 1.4rem;
}
.gallery__item {
  break-inside: avoid;
  margin-bottom: 1.4rem;
  position: relative;
  overflow: hidden;
  background: var(--surface);
}
.gallery__item img {
  filter: grayscale(0.2) brightness(0.92);
  transition: transform 0.6s var(--ease), filter 0.6s var(--ease);
}
.gallery__item:hover img { transform: scale(1.04); filter: grayscale(0) brightness(1); }
.gallery__item figcaption {
  position: absolute; left: 0; bottom: 0; right: 0;
  padding: 1.4rem 1.2rem 1rem;
  font-family: "Inter", sans-serif; font-size: 0.68rem; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--text);
  background: linear-gradient(transparent, rgba(10,9,8,0.85));
  opacity: 0; transition: opacity 0.4s var(--ease);
}
.gallery__item:hover figcaption { opacity: 1; }
.gallery__item.is-hidden { display: none; }

/* =========================================================
   创作团队 TEAM
   ========================================================= */
.team {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 4rem;
  align-items: center;
}
.team__photo img { filter: grayscale(0.3) brightness(0.9); }
.team__role {
  font-family: "Inter", sans-serif; font-size: 0.72rem; letter-spacing: 0.4em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 1.2rem;
}
.team__name { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 500; letter-spacing: 0.12em; }
.team__name em { display: block; margin-top: 0.4em; }
.team__bio { margin-top: 1.8rem; color: var(--text-dim); letter-spacing: 0.03em; }
.team__meta {
  margin-top: 2.4rem; list-style: none;
  display: flex; gap: 2.6rem; flex-wrap: wrap;
}
.team__meta li {
  display: flex; flex-direction: column; gap: 0.4rem;
  font-size: 1.3rem; letter-spacing: 0.05em;
}
.team__meta span {
  font-family: "Inter", sans-serif; font-size: 0.6rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--text-dim);
}

/* =========================================================
   客户评价 REVIEWS
   ========================================================= */
.reviews {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}
.review {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 3rem 2.6rem;
}
.section--alt .review { background: var(--bg); }
.review__quote { font-size: 1.15rem; letter-spacing: 0.04em; line-height: 2; color: var(--text); }
.review__from {
  margin-top: 1.8rem; font-size: 0.92rem; color: var(--gold); letter-spacing: 0.08em;
}
.review__from em { display: block; margin-top: 0.4em; }

/* =========================================================
   预约表单 FORM
   ========================================================= */
.form {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 3.5rem 3rem;
  max-width: 960px;
}
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.8rem; margin-bottom: 1.8rem; }
.form__field { display: flex; flex-direction: column; gap: 0.7rem; }
.form__field label {
  font-size: 0.92rem; letter-spacing: 0.1em; color: var(--text);
}
.form__field label em { display: inline; margin-left: 0.4em; }
.form__field input,
.form__field select {
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  font-family: "Noto Serif SC", serif;
  font-size: 0.98rem; letter-spacing: 0.04em;
  padding: 0.95em 1.1em;
  transition: border-color 0.3s var(--ease);
}
.form__field input::placeholder { color: var(--text-dim); }
.form__field input:focus,
.form__field select:focus { outline: none; border-color: var(--gold); }
.form__field select { appearance: none; cursor: pointer; }
/* 让日期/选择控件在深色下可读 */
.form__field input[type="date"] { color-scheme: dark; }
.form__field input.is-invalid,
.form__field select.is-invalid { border-color: #b5564f; }
.form__submit { margin-top: 1rem; width: 100%; justify-content: center; }

/* =========================================================
   页脚 FOOTER
   ========================================================= */
.footer { background: var(--bg-soft); border-top: 1px solid var(--line); }
.footer__inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 4.5rem 2rem;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 1.2rem;
}
.footer__brand { display: flex; flex-direction: column; line-height: 1.1; }
.footer__brand-cn { font-size: 1.3rem; letter-spacing: 0.35em; font-weight: 500; }
.footer__brand-en { font-family: "Inter", sans-serif; font-size: 0.62rem; letter-spacing: 0.5em; color: var(--gold); margin-top: 0.4em; }
.footer__company { color: var(--text-dim); letter-spacing: 0.1em; font-size: 0.9rem; }
.footer__links { display: flex; gap: 2rem; }
.footer__links a { color: var(--text-dim); font-size: 0.9rem; letter-spacing: 0.1em; transition: color 0.3s; }
.footer__links a:hover { color: var(--gold); }
.footer__copy { color: var(--text-dim); font-family: "Inter", sans-serif; font-size: 0.72rem; letter-spacing: 0.2em; }

/* =========================================================
   成功弹窗 MODAL
   ========================================================= */
.modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  background: rgba(10, 9, 8, 0.78);
  backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden; transition: opacity 0.4s var(--ease), visibility 0.4s;
}
.modal.is-open { opacity: 1; visibility: visible; }
.modal__box {
  background: var(--surface);
  border: 1px solid var(--gold-dim);
  padding: 3.5rem 3rem;
  text-align: center;
  max-width: 420px; width: 90%;
  transform: translateY(12px); transition: transform 0.4s var(--ease);
}
.modal.is-open .modal__box { transform: translateY(0); }
.modal__mark {
  width: 56px; height: 56px; margin: 0 auto 1.6rem;
  border: 1px solid var(--gold); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--gold); font-size: 1.4rem;
}
.modal__title { font-size: 1.6rem; letter-spacing: 0.18em; font-weight: 500; }
.modal__text { margin: 1.2rem 0 2.2rem; color: var(--text-dim); letter-spacing: 0.04em; }

/* =========================================================
   响应式 RESPONSIVE
   ========================================================= */
@media (max-width: 980px) {
  .services { grid-template-columns: repeat(2, 1fr); }
  .gallery { column-count: 2; }
  .team { grid-template-columns: 1fr; gap: 2.5rem; }
  .team__photo { max-width: 420px; }
}

@media (max-width: 760px) {
  .nav__links {
    position: fixed; top: 0; right: 0;
    height: 100vh; width: 72%; max-width: 320px;
    flex-direction: column; justify-content: center; align-items: flex-start;
    gap: 2rem; padding: 3rem;
    background: rgba(10, 9, 8, 0.96);
    backdrop-filter: blur(20px);
    transform: translateX(100%); transition: transform 0.45s var(--ease);
  }
  .nav__links.is-open { transform: translateX(0); }
  .nav__link { font-size: 1.2rem; }
  .nav__toggle { display: flex; z-index: 101; }

  .section { padding: 5.5rem 1.4rem; }
  .section__head { margin-bottom: 3rem; }
  .services { grid-template-columns: 1fr; }
  .gallery { column-count: 1; }
  .reviews { grid-template-columns: 1fr; }
  .form { padding: 2.2rem 1.6rem; }
  .form__row { grid-template-columns: 1fr; gap: 1.2rem; }
  .hero__slogan { letter-spacing: 0.22em; }
}

@media (max-width: 420px) {
  .filters { gap: 0.5rem; }
  .filter { padding: 0.55em 1em; font-size: 0.82rem; }
  .team__meta { gap: 1.6rem; }
}