@import url("https://fonts.googleapis.com/css2?family=LXGW+WenKai+Mono+TC&family=Noto+Sans+TC:wght@100..900&family=Noto+Serif+TC:wght@200..900&display=swap");

:root {
  --bg-color: #ffffff;
  --text-1: #444444;
  --text-2: #666666;
  --text-3: #888888;
  --text-1-white: #ffffff;
  --text-2-white: #e0e0e0;
  --text-3-white: #cccccc;
  --border-color: #eeeeee;
  --btn-color: #f5f5dc;
  --accent-color: #8c6239;
  /* 優雅的暖褐色 */
  --accent-hover: #b08257;
  /* 懸停時略微變亮，提升互動感 */
  /* --font-body: "Noto Sans TC", sans-serif; */
  font-family: "Noto Serif TC", serif;
  /* font-family: "LXGW WenKai Mono TC", monospace; */
  --navbar-height: 4.8rem;
}

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

html {
  overflow-x: hidden;
  overflow-y: scroll;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}

/* === 原生 View Transitions API (超輕量頁面切換淡入淡出) === */
@view-transition {
  navigation: auto;
}

body {
  background-color: var(--bg-color);
  color: var(--text-1);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

body.page-loaded {
  opacity: 1;
}

body.page-fade-out {
  opacity: 0 !important;
}

/* === TYPOGRAPHY (H1~H6) === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Noto Serif TC", serif;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.1em;
  /* 呼吸感字距，展現高階室內設計品牌感 */
  /* color: var(--text-1); */
}

h1 {
  font-size: 2.4rem;
}

h2 {
  font-size: 2.0rem;
}

h3 {
  font-size: 1.6rem;
}

h4 {
  font-size: 1.2rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
  letter-spacing: 0.15em;
}

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

/* Navigation */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.6rem 2rem;
  position: fixed;
  /* 改回 fixed 才能全域固定 */
  top: 0;
  width: 100%;
  /* height: var(--navbar-height); */
  z-index: 100;
  transition:
    transform 0.3s ease-in-out,
    background-color 0.3s;
  /* 加入 transform 動畫 */
  background-color: var(--bg-color);
  color: var(--text-1);
  border-bottom: 1px solid var(--border-color);
}

.nav-hidden {
  transform: translateY(-100%);
  /* 往上平移隱藏 */
}

.transparent-nav {
  /* 由上往下的漸層，從較深的半透明黑，漸變到完全透明 */
  background: linear-gradient(to bottom,
      rgba(0, 0, 0, 0.64) 0%,
      rgba(0, 0, 0, 0) 100%);
  color: #fff;
  position: fixed;
  /* 移除底線跟毛玻璃，讓漸層邊緣更柔和融合進圖片 */
  border-bottom: none;
  width: 100%;
}

.transparent-nav .nav-links {
  color: #fff;
  /* 連結文字改為白色 */
}

/* 當頁面往下捲動時，覆蓋回實體白底的樣式 */
.transparent-nav.scrolled {
  background: var(--bg-color);
  color: var(--text-1);
  border-bottom: 1px solid var(--border-color);
}

.transparent-nav.scrolled .nav-links {
  color: var(--text-2);
}

.logo a {
  display: flex;
  align-items: center;
}

.logo a img {
  height: 2.2rem;
  /* 適合的優雅 Logo 高度，可依設計微調 */
  width: auto;
  display: block;
}

/* 預設狀態：顯示深色 Logo，隱藏白色 Logo */
.logo-dark {
  display: block;
}

.logo-white {
  display: none;
}

/* 首頁頂端「透明導覽列」狀態：顯示白色 Logo，隱藏深色 Logo */
.transparent-nav .logo-dark {
  display: none;
}

.transparent-nav .logo-white {
  display: block;
}

/* 首頁向下滑動「白底導覽列」狀態：顯示深色 Logo，隱藏白色 Logo */
.transparent-nav.scrolled .logo-dark {
  display: block;
}

.transparent-nav.scrolled .logo-white {
  display: none;
}

.nav-links {
  color: var(--text-2);
  display: flex;
  list-style: none;
  gap: 3rem;
}

.nav-links a {
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -4px;
  left: 0;
  background-color: currentColor;
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Hamburger Menu Toggle (Hidden by default) */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 101;
  /* Above nav links */
}

.active {
  color: var(--text-2);
}

.menu-toggle span {
  width: 25px;
  height: 2px;
  background-color: currentColor;
  transition: all 0.3s ease;
}

/* Active state for hamburger icon */
.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* === SIMPLE PAGES === */
.simple-page {
  padding: 8rem 4rem;
  max-width: 800px;
  margin: 0 auto;
  min-height: 75vh;
}

.simple-page h1 {
  margin-bottom: 2rem;
  font-weight: 400;
  font-size: 2rem;
}

.simple-footer {
  text-align: center;
  padding: 3rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-2);
}

/* === RESPONSIVE === */
@media (orientation: portrait) {
  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--bg-color);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    visibility: hidden;
    opacity: 0;
    transition:
      opacity 0.4s ease,
      visibility 0.4s ease;
    z-index: 90;
    touch-action: none;
  }

  .nav-links.nav-active {
    visibility: visible;
    opacity: 1;
  }

  .nav-links a {
    font-size: 1.5rem;
    color: var(--text-1);
  }

  /* 在手機板時，不使用透明漸層，強制變回實體白底 */
  /* .transparent-nav {
    background: var(--bg-color);
    color: var(--text-1);
    border-bottom: 1px solid var(--border-color);
  } */

  .transparent-nav .nav-links {
    color: var(--text-1);
    /* 改為深色，因為背景是白色 */
  }

  /* 手機直向時，導覽列強迫變回白底，Logo 必須始終維持深色 */
  /* .logo-dark {
    display: block !important;
  }

  .logo-white {
    display: none !important;
  } */
}

@media (max-width: 880px) {
  html {
    font-size: 12px;
  }

  /* .navbar {
    padding: 0.8rem 1.2rem;
  } */

  .simple-page {
    padding: 2rem 2rem 6rem 2rem;
  }
}