/* ============================================================
   阳光角落摄影 · 共享基础样式
   包含：设计变量 / 重置 / 排版 / 顶部导航 / 移动端菜单 /
        通用按钮与链接 / 页脚 / 页面转场 / 动画偏好
   ============================================================ */

:root {
  /* 中性色体系：以纸张色与墨色为主，避免干扰摄影作品 */
  --paper: #f4f2ee;
  --paper-2: #ebe8e1;
  --ink: #161615;
  --ink-2: #55534d;
  --muted: #8c8981;
  --line: rgba(22, 22, 21, 0.14);
  --line-strong: rgba(22, 22, 21, 0.3);
  --accent: #9a7e55;
  --white: #faf9f6;
  --white-dim: rgba(250, 249, 246, 0.66);

  --header-h: 76px;
  --gutter: clamp(20px, 5vw, 72px);
  --max: 1560px;

  --font-display: "Cormorant Garamond", "Songti SC", "STSong", "Georgia", serif;
  --font-sans: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  background: var(--paper);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

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

::selection {
  background: var(--ink);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  transform: translateY(-200%);
  transition: transform 0.3s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 通用文字与装饰 ---------- */

.eyebrow {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.text-link span {
  transition: transform 0.35s var(--ease);
}

.text-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.text-link:hover span {
  transform: translateX(5px);
}

/* ---------- 顶部固定导航 ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 var(--gutter);
  color: var(--ink);
  background: rgba(244, 242, 238, 0.78);
  -webkit-backdrop-filter: blur(16px) saturate(120%);
  backdrop-filter: blur(16px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease), color 0.4s var(--ease),
    border-color 0.4s var(--ease);
}

.site-header.is-solid {
  background: rgba(244, 242, 238, 0.92);
  border-bottom-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  line-height: 1;
}

.brand-cn {
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 400;
  letter-spacing: 0.16em;
}

.brand-en {
  padding-left: 12px;
  border-left: 1px solid currentColor;
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.22em;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(22px, 3vw, 40px);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: inherit;
  opacity: 0.72;
  transition: opacity 0.3s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease);
}

.nav-link:hover,
.nav-link.is-active {
  opacity: 1;
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-count {
  font-size: 9px;
  line-height: 1;
  opacity: 0.55;
  transform: translateY(-4px);
}

.menu-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.menu-toggle span {
  position: absolute;
  left: 9px;
  width: 22px;
  height: 1px;
  background: currentColor;
  transition: transform 0.4s var(--ease), opacity 0.3s var(--ease);
}

.menu-toggle span:nth-child(1) {
  top: 17px;
}

.menu-toggle span:nth-child(2) {
  top: 24px;
}

/* 首页初始为透明导航（覆盖在主视觉上） */
.page-home .site-header {
  color: var(--white);
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border-bottom-color: transparent;
}

.page-home .site-header.is-solid {
  color: var(--ink);
  background: rgba(244, 242, 238, 0.92);
  border-bottom-color: var(--line);
}

/* ---------- 移动端全屏菜单 ---------- */

.menu-panel {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(var(--header-h) + 46px) var(--gutter) 40px;
  background: #121211;
  color: var(--white);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.45s var(--ease), visibility 0.45s var(--ease);
}

.menu-panel.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.menu-nav {
  display: flex;
  flex-direction: column;
}

.menu-nav a {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(250, 249, 246, 0.12);
  font-family: var(--font-display);
  font-size: clamp(34px, 9vw, 52px);
  line-height: 1.15;
  color: var(--white);
  transition: color 0.3s var(--ease), padding-left 0.4s var(--ease);
}

.menu-nav a span {
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--white-dim);
}

.menu-nav a:hover {
  color: var(--accent);
  padding-left: 8px;
}

.menu-panel.is-open .menu-nav a {
  animation: menuItemIn 0.6s var(--ease-out) both;
}

.menu-panel.is-open .menu-nav a:nth-child(2) {
  animation-delay: 0.08s;
}

.menu-panel.is-open .menu-nav a:nth-child(3) {
  animation-delay: 0.16s;
}

.menu-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding-top: 22px;
  border-top: 1px solid rgba(250, 249, 246, 0.12);
  font-size: 12px;
  color: var(--white-dim);
}

.menu-foot p {
  margin: 0;
  letter-spacing: 0.04em;
}

.menu-foot a {
  color: var(--white);
}

body.menu-open {
  overflow: hidden;
}

body.menu-open .site-header {
  color: var(--white);
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border-color: transparent;
}

body.menu-open .menu-toggle span:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

body.menu-open .menu-toggle span:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ---------- 按钮 ---------- */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 56px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.35s var(--ease), color 0.35s var(--ease),
    border-color 0.35s var(--ease);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.65;
}

.btn-dark {
  background: var(--ink);
  color: var(--paper);
}

.btn-dark:hover:not(:disabled) {
  background: #2c2b28;
}

.btn-outline {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-outline:hover {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.btn-arrow {
  transition: transform 0.35s var(--ease);
}

.btn:hover .btn-arrow {
  transform: translateX(5px);
}

/* ---------- 页脚 ---------- */

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px var(--gutter) 36px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-2);
}

.site-footer p {
  margin: 0;
  letter-spacing: 0.04em;
}

.site-footer nav {
  display: flex;
  gap: 24px;
}

.site-footer nav a {
  opacity: 0.7;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.site-footer nav a:hover {
  opacity: 1;
  color: var(--accent);
}

.footer-note {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 页面进入与滚动显现 ---------- */

.page-gallery main,
.page-contact main {
  animation: pageEnter 0.75s var(--ease-out) both;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* 页面切换到站内链接时使用的过渡遮罩 */
.page-veil {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--paper);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}

.page-home .page-veil {
  background: #101010;
}

.page-veil.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 响应式 ---------- */

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .site-nav {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .brand-cn {
    font-size: 20px;
  }

  .site-footer {
    flex-wrap: wrap;
    padding-bottom: 30px;
  }

  .footer-note {
    width: 100%;
    order: 3;
  }
}

@media (max-width: 520px) {
  .site-footer nav {
    gap: 18px;
  }

  .menu-foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* ---------- 动画关键帧 ---------- */

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes menuItemIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 尊重“减少动态效果”系统设置 ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}