@import url("https://fonts.googleapis.com/css2?family=Google+Sans+Flex:opsz,wdth,wght,ROND@8..144,25..151,100..1000,1..100&family=Noto+Sans+HK:wght@100..900&display=swap");

/* =========================================================
   色彩
   ========================================================= */
:root,
body,
body.light {
  --primary: #006a70;
  --on-primary: #e6fdff;
  --primary-container: #9beaf0;
  --on-primary-container: #00575c;
  --inverse-primary: #a3f3f9;

  --secondary: #676031;
  --on-secondary: #fff9e5;
  --secondary-container: #fcf2b6;
  --on-secondary-container: #625b2d;

  --tertiary: #6f5e00;
  --on-tertiary: #fff8eb;
  --tertiary-container: #fee264;
  --on-tertiary-container: #605100;

  --background: #effcff;
  --on-background: #003841;
  --surface: #effcff;
  --on-surface: #003841;
  --surface-variant: #b2ecf9;
  --on-surface-variant: #2c6772;
  --inverse-surface: #001114;
  --inverse-on-surface: #85a2a9;

  --error: #ac3434;
  --on-error: #fff7f6;
  --error-container: #f56965;
  --on-error-container: #65000b;

  --outline: #4a838f;
  --outline-variant: #82bbc8;
  --scrim: #000000;

  --surface-container-lowest: #ffffff;
  --surface-container-low: #ddf8ff;
  --surface-container: #cbf5ff;
  --surface-container-high: #bef1fc;
  --surface-container-highest: #b2ecf9;
}

body.dark,
[data-theme="dark"] {
  --primary: #d0fcff;
  --on-primary: #00666c;
  --primary-container: #006c74;
  --on-primary-container: #8bdee2;
  --inverse-primary: #006a70;

  --secondary: #cec7a2;
  --on-secondary: #454125;
  --secondary-container: #2a260d;
  --on-secondary-container: #aba482;

  --tertiary: #fff1be;
  --on-tertiary: #695900;
  --tertiary-container: #695600;
  --on-tertiary-container: #f5e691;

  --background: #001114;
  --on-background: #c4ecf6;
  --surface: #001114;
  --on-surface: #c4ecf6;
  --surface-variant: #002a31;
  --on-surface-variant: #8ab2bb;
  --inverse-surface: #effcff;
  --inverse-on-surface: #45585d;

  --error: #ff716c;
  --on-error: #490006;
  --error-container: #8a1a1e;
  --on-error-container: #ff9993;

  --outline: #557b84;
  --outline-variant: #264d56;
  --scrim: #000000;

  --surface-container-lowest: #000000;
  --surface-container-low: #00161b;
  --surface-container: #001d22;
  --surface-container-high: #00242a;
  --surface-container-highest: #002a31;
}

/* =========================================================
   全域基礎排版
   ========================================================= */
body {
  font-family: "Google Sans Flex", "Noto Sans HK", sans-serif;
  font-variation-settings: "ROND" 100;
  background-color: var(--background);
  color: var(--on-surface);
  line-height: 1.15;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-variation-settings:
    "ROND" 50,
    "wdth" 108,
    "opsz" 140;
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}

.fw-bold {
  font-weight: 700 !important;
}
.fw-medium {
  font-weight: 500 !important;
}

.page-header-left {
  padding-top: 80px;
  margin-bottom: 32px;
  text-align: left !important;
}

nav.top {
  gap: 8px !important;
  height: 64px;
  border: none;
}
nav.top.transparent {
  background-color: transparent !important;
  box-shadow: none !important;
}
.narrow-btn {
  width: 32px !important;
  min-width: 32px !important;
  padding: 0 !important;
}
.menu-item-split {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
}

/* =========================================================
   全域 Icon 設定
   ========================================================= */
body i,
body .material-symbols-rounded {
  font-family: "Material Symbols Rounded", sans-serif !important;
  /* 
    FILL: 0,1
    wght: 100~100
    GRAD: 0~100
    opsz: 24
  */
  font-variation-settings:
    "FILL" 0,
    "wght" 320,
    "GRAD" 0,
    "opsz" 24;
}
.icon-filled {
  font-variation-settings:
    "FILL" 1,
    "wght" 320,
    "GRAD" 0,
    "opsz" 24 !important;
}

/* =========================================================
   全域按鈕
   ========================================================= */

/* 確保其不會與底部導覽列重疊 */
@media (max-width: 900px) {
  .fab.fixed.bottom {
    bottom: 88px !important;
    right: 16px !important;
  }
}

/* 電腦版位置 */
@media (min-width: 901px) {
  .fab.fixed.bottom {
    bottom: 32px !important;
    right: 32px !important;
  }
}

/* FAB 陰影 */
.fab {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2) !important;
  transition: all 0.3s cubic-bezier(0.2, 0, 0, 1) !important;
}

.fab:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3) !important;
}

/* =========================================================
   Dropdown Menu
   ========================================================= */
@keyframes menu-pop {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

menu {
  background-color: var(--surface-container) !important;
  padding: 4px !important;
  box-shadow:
    0 4px 8px 2px rgba(0, 0, 0, 0.1),
    0 4px 4px rgba(0, 0, 0, 0.25) !important;
  animation: menu-pop 0.2s cubic-bezier(0.2, 0, 0, 1);
  transform-origin: top right;
}

.dropdown-menu-fix {
  right: 0 !important;
  left: auto !important;
  width: max-content;
}

/* =========================================================
   首頁與卡片
   ========================================================= */
.bg-banner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60vh;

  background-size: cover;
  background-position: center 30%;
  background-attachment: scroll;
  z-index: -1;

  -webkit-mask-image: linear-gradient(
    to bottom,
    black 0%,
    rgba(0, 0, 0, 0.98) 18%,
    rgba(0, 0, 0, 0.94) 30%,
    rgba(0, 0, 0, 0.86) 45%,
    rgba(0, 0, 0, 0.7) 58%,
    rgba(0, 0, 0, 0.48) 72%,
    rgba(0, 0, 0, 0.25) 86%,
    rgba(0, 0, 0, 0.08) 94%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    black 0%,
    rgba(0, 0, 0, 0.98) 18%,
    rgba(0, 0, 0, 0.94) 30%,
    rgba(0, 0, 0, 0.86) 45%,
    rgba(0, 0, 0, 0.7) 58%,
    rgba(0, 0, 0, 0.48) 72%,
    rgba(0, 0, 0, 0.25) 86%,
    rgba(0, 0, 0, 0.08) 94%,
    transparent 100%
  );
}

@keyframes banner-float {
  0% {
    background-position: center 20%;
    transform: translateY(0px);
  }
  50% {
    background-position: center 45%;
    transform: translateY(8px);
  }
  100% {
    background-position: center 20%;
    transform: translateY(0px);
  }
}

.profile-section {
  padding-top: 24vh;
  margin-bottom: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.profile-section .shape,
.profile-section .profile-avatar {
  margin: 0 auto;
}

.profile-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 4px solid var(--background);
}

.section-heading {
  margin-top: 32px !important;
  margin-bottom: 12px !important;
  color: var(--primary) !important;
  text-align: left;
}

.home-card {
  background-color: var(--surface-container-low) !important;
  border-radius: 20px !important;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: flex-start !important;
  gap: 16px;
  text-decoration: none;
  color: var(--on-surface) !important;
  border: 2px solid transparent !important;
  transition: 0.2s ease;
  overflow: visible !important;
}

.home-card:hover {
  background-color: var(--surface-container-high) !important;
  border-color: var(--primary) !important;
}

.circle-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 2000px !important;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  overflow: visible !important;
  z-index: 1;
}

.circle-icon-box img,
.circle-icon-box i {
  width: 22px;
  height: 22px;
  object-fit: contain;
  border-radius: 0 !important;
  clip-path: none !important;
  -webkit-clip-path: none !important;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit !important;
}

.card-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
}
.card-title {
  font-size: 1.25rem;
  font-weight: 700;
}
.card-desc {
  font-size: 0.85rem;
  opacity: 0.8;
}
.card-trailing {
  opacity: 0.8;
  margin-left: auto;
}

.card-yt .circle-icon-box {
  background-color: #ffdad6 !important;
  color: #410002 !important;
}
.card-dc .circle-icon-box {
  background-color: #d8e2ff !important;
  color: #001a41 !important;
}
.card-x .circle-icon-box,
.card-threads .circle-icon-box {
  background-color: #e6e1e5 !important;
  color: #1c1b1f !important;
}
.card-mail .circle-icon-box {
  background-color: var(--primary-container) !important;
  color: var(--on-primary-container) !important;
}
.card-sponsor .circle-icon-box {
  background-color: var(--secondary-container) !important;
  color: var(--on-secondary-container) !important;
}

/* =========================================================
   水平滑動影片列表
   ========================================================= */
.section-sub-heading {
  font-size: 1.2rem !important;
  margin-top: 32px !important;
  margin-bottom: 12px !important;
  color: var(--on-surface-variant) !important;
  text-align: left;
}

.horizontal-scroll-container {
  display: flex;
  overflow-x: auto;
  gap: 16px;
  padding: 8px 0;
  scrollbar-width: none;
  scroll-snap-type: x mandatory;
}

.horizontal-scroll-container::-webkit-scrollbar {
  display: none;
}

.scroll-card {
  width: 280px;
  flex-shrink: 0;
  scroll-snap-align: start;
  text-decoration: none;
  display: block;
}

.scroll-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 16px;
  transition: transform 0.2s ease;
}

.scroll-card:hover img {
  transform: scale(0.98);
}

/* =========================================================
   影片頁面
   ========================================================= */

.video-grid-fixed-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 12px 0;
}
@media (max-width: 1024px) {
  .video-grid-fixed-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .video-grid-fixed-4 {
    grid-template-columns: 1fr;
  }
}

.video-card-m3 {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--on-surface);
  background: transparent;
  border: none;
  transition: transform 0.2s ease;
  height: 100%;
}

.video-card-m3 img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  border-radius: 12px;
  transition: 0.3s cubic-bezier(0.2, 0, 0, 1);
}

.video-info {
  padding: 12px 4px;
  text-align: left;
}

.video-title {
  font-weight: 700;
  font-size: 1rem;

  line-height: 1.4;
  height: 2.8em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-clamp: 2;

  white-space: normal;
  overflow: hidden;
  color: var(--on-surface);
}

.video-card-m3:hover img {
  transform: scale(0.98);
  filter: brightness(0.6);
}

.video-card-m3:hover .video-title {
  color: var(--primary);
}

/* =========================================================
   TopBar
   ========================================================= */

nav.top.transparent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent !important;
  box-shadow: none !important;
}

@media (min-width: 992px) {
  nav.m.l.left.max ~ nav.top.transparent {
    left: 260px;
  }
}

/* =========================================================
   Hero Banner
   ========================================================= */

.video-hero-section {
  position: relative;
  width: 100%;
  height: 50vh;
  min-height: 300px;
  background-color: #000;
  overflow: hidden !important;
  margin-top: 0 !important;
  display: block !important;

  border-bottom-left-radius: 40px;
  border-bottom-right-radius: 40px;
}

.hero-video-bg {
  position: absolute;
  top: 0%;
  left: 0;
  width: 100%;
  height: 130%;
  background-size: cover;
  background-position: center right;
  z-index: 1;

  -webkit-mask-image: radial-gradient(
    ellipse at 50% 0%,
    black 0%,
    rgba(0, 0, 0, 1) 42%,
    rgba(0, 0, 0, 0.4) 65%,
    rgba(0, 0, 0, 0.1) 85%,
    transparent 100%
  );
  mask-image: radial-gradient(
    ellipse at 50% 0%,
    black 0%,
    rgba(0, 0, 0, 1) 42%,
    rgba(0, 0, 0, 0.4) 65%,
    rgba(0, 0, 0, 0.1) 85%,
    transparent 100%
  );
}

.hero-video-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1440px;

  height: 100% !important;
  display: flex !important;
  align-items: flex-end !important;

  margin: 0 auto;
  padding: 0 48px 60px 48px !important;
  justify-content: space-between;
  box-sizing: border-box;
}

.hero-text-area {
  flex: 1;
  max-width: 60%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: white;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.1;
  margin: 0;
}

.hero-watch-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  height: auto !important;
  padding: 20px 24px !important;
  border-radius: 50px !important;
  gap: 12px !important;
  white-space: nowrap;
  flex-shrink: 0;
}

.hero-watch-btn span {
  font-size: 1.25rem !important;
  font-weight: 600 !important;
}

.hero-watch-btn i {
  font-size: 1.5rem !important;
  font-variation-settings:
    "FILL" 1,
    "wght" 300 !important;
  margin-top: 6px;
}

/* =========================================================
   手機版修正
   ========================================================= */
@media (max-width: 900px) {
  .video-hero-section {
    overflow: visible !important;
    border-radius: 0 !important;

    height: 20vh !important;
    min-height: 350px !important;
    position: relative !important;
    display: block !important;
  }

  .hero-video-bg {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    border-bottom-left-radius: 40px !important;
    border-bottom-right-radius: 40px !important;
    overflow: hidden !important;
    z-index: 1 !important;
    background-position: center center !important;

    background-image:
      linear-gradient(
        to top,
        rgba(0, 0, 0, 0.9) 0%,
        rgba(0, 0, 0, 0.4) 50%,
        transparent 100%
      ),
      url("https://i.ytimg.com/vi/cWtlTfjlUvs/maxresdefault.jpg") !important;
  }

  .hero-video-content {
    position: absolute !important;
    bottom: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: auto !important;
    z-index: 10 !important;

    display: flex !important;
    flex-direction: column !important;
    align-items: flex-start !important;

    padding: 0 24px 40px 24px !important;
    box-sizing: border-box !important;
  }

  .hero-text-area {
    max-width: 100% !important;
    margin: 0 0 16px 0 !important;
    padding: 0 !important;
    background: none !important;
  }

  .hero-title {
    font-size: 1.7rem !important;
    font-weight: 900 !important;
    line-height: 1.2 !important;
    color: white !important;
    text-align: left !important;
    margin: 0 !important;
  }

  .hero-desc {
    font-size: 1rem !important;
    color: rgba(255, 255, 255, 0.8) !important;
    margin: 8px 0 0 0 !important;
    text-align: left !important;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .hero-watch-btn {
    width: fit-content !important;
    height: 48px !important;
    padding: 0 16px !important;
    justify-content: center !important;
    display: inline-flex !important;
    margin: 0 !important;
  }

  .hero-watch-btn span {
    font-size: 1rem !important;
    font-weight: 500 !important;
  }

  .hero-watch-btn i {
    font-size: 1.5rem !important;
    font-variation-settings:
      "FILL" 1,
      "wght" 300 !important;
    margin-top: 2px;
  }
}

@media (max-width: 900px) {
  .video-hero-section {
    overflow: hidden; /* 仍可維持安全 */
  }

  .bg-banner,
  .hero-video-bg {
    transform: none !important;
    transition: none !important;
    will-change: auto !important;
    background-position: center center !important;
  }

  .bg-banner {
    background-attachment: scroll !important;
  }
}

/* =========================================================
   手機版全域邊距優化
   ========================================================= */

@media (max-width: 900px) {
  main.responsive {
    padding-left: 20px !important;
    padding-right: 20px !important;
  }

  .page-header-left {
    padding-left: 2px;
    padding-right: 2px;
  }
}

/* =========================================================
   分組式列表
   ========================================================= */

.list-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 24px;
}

.list-item {
  background-color: var(--surface-container-low);
  padding: 16px;
  border-radius: 4px;
  color: var(--on-surface);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

a.list-item:hover {
  background-color: var(--surface-container-high);
}

.list-item:first-child {
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
}

.list-item:last-child {
  border-bottom-left-radius: 20px;
  border-bottom-right-radius: 20px;
}

.list-item:only-child {
  border-radius: 20px;
}

.list-item-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.list-item-icon {
  font-size: 24px;
  color: var(--primary);
  flex-shrink: 0;
}

.list-item-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.list-item-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--on-surface);
  line-height: 1.2;
}

.list-item-desc {
  font-size: 0.85rem;
  opacity: 0.8;
  line-height: 1.4;
  word-break: break-word;
}

.list-item-title-wrapper {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.list-item-action {
  font-size: 20px;
  color: var(--on-surface-variant);
  flex-shrink: 0;
}

.status-badge {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 12px;
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  white-space: nowrap;
  font-weight: 700;
}

.status-badge.offline {
  background-color: var(--surface-variant);
  color: var(--on-surface-variant);
}

.status-badge.upcoming {
  background-color: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

/* =========================================================
   遊戲 ID 專用列表佈局 (Game ID Layout)
   ========================================================= */
.id-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.id-info {
  flex: 1 1 300px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.id-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--on-surface);
}

.id-desc {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  line-height: 1.4;
}

.id-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: nowrap;
}

.id-field {
  margin: 0 !important;
  min-width: 180px;
  border-radius: 16px !important;
}

.id-input {
  font-family: "Roboto Mono", monospace;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--on-surface);
  padding: 0 16px !important;
  opacity: 1 !important;
}

/* =========================================================
   準星卡片
   ========================================================= */
.xhair-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.xhair-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-container-high);
  padding: 12px 16px;
  border-radius: 16px;
}

.xhair-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.xhair-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--on-surface);
}

.xhair-input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 0;
  font-family: "Roboto Mono", monospace;
  font-size: 0.8rem;
  outline: none;
  color: var(--on-surface-variant);
  text-overflow: ellipsis;
}

.xhair-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 700;
  display: inline-block;
  white-space: nowrap;
}
.xhair-tag.rec {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
}
.xhair-tag.sec {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  opacity: 0.8;
}
.xhair-tag.neon {
  background: var(--primary-container);
  color: var(--on-primary-container);
}
.xhair-tag.train {
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}
.xhair-tag.fun {
  background: var(--error-container);
  color: var(--on-error-container);
}

.sub-category-title {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 700;
  margin: 24px 0 12px 4px;
  letter-spacing: 0.5px;
}

.sub-category-title:first-child {
  margin-top: 8px;
}

.page {
  display: none;
}
.page.active {
  display: block !important;
}

/* =========================================================
   標籤頁擴充
   ========================================================= */

.page-tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.page-tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================================
   表格
   ========================================================= */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 32px;
  border-radius: 20px;
  border: 1px solid var(--outline-variant);
  background-color: var(--surface-container-lowest);
}

table.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

table.custom-table th,
table.custom-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--surface-variant);
}

table.custom-table th {
  background-color: var(--surface-container-low);
  font-weight: 700;
  color: var(--on-surface);
}

table.custom-table tr:last-child td {
  border-bottom: none;
}

/* =========================================================
   頁面轉場
   ========================================================= */

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: page-fade-out 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

::view-transition-new(root) {
  animation: page-fade-in-up 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  mix-blend-mode: normal;
}

@keyframes page-fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes page-fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

main {
  animation: slideUpFade 0.5s cubic-bezier(0.2, 0, 0, 1) forwards;
}

/* =========================================================
   教學頁面 - 橫向輪播清單
   ========================================================= */

.carousel-container {
  position: relative;
}

.playlist-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 85%;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  scroll-behavior: smooth;
  padding: 8px 0 16px 0;
}

.playlist-row::-webkit-scrollbar {
  display: none;
}

@media (min-width: 600px) {
  .playlist-row {
    grid-auto-columns: calc(50% - 8px);
  }
}
@media (min-width: 900px) {
  .playlist-row {
    grid-auto-columns: calc(33.333% - 10.66px);
  }
}
@media (min-width: 1200px) {
  .playlist-row {
    grid-auto-columns: calc(25% - 12px);
  }
}

.playlist-row .video-card-m3 {
  scroll-snap-align: start;
}

.carousel-btn {
  position: absolute;
  top: 40%;
  transform: translateY(-50%);
  z-index: 10;

  width: 40px;
  height: 40px;
  min-width: 40px;
  padding: 0;
  border-radius: 50%;

  background-color: var(--surface-container-highest);
  color: var(--on-surface);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);

  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);

  opacity: 0;
  pointer-events: none;
}

.carousel-btn.visible {
  opacity: 1;
  pointer-events: auto;
}

.carousel-btn:hover {
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
  transform: translateY(-50%) scale(1.1);
}

.carousel-btn i {
  font-size: 24px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
}

.carousel-btn.left {
  left: 8px;
}
.carousel-btn.right {
  right: 8px;
}

@media (max-width: 900px) {
  .carousel-btn {
    display: none !important;
  }
  .playlist-row {
    padding-left: 4px;
    padding-right: 4px;
  }
}

/* =========================================================
   Topbar 毛玻璃效果
   ========================================================= */

nav.top.surface {
  background-color: var(--surface) !important;
  background: color-mix(in srgb, var(--surface) 85%, transparent) !important;

  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* =========================================================
   頁尾樣式 (Footer - Material Design Style)
   ========================================================= */
footer {
  padding: 48px 24px;
  background-color: var(--surface);
  margin-top: 64px;
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 900px) {
  .footer-container {
    grid-template-columns: 1fr 2fr; /* 左側品牌 1/3, 右側連結 2/3 */
  }
}

/* 品牌區 */
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

/* 連結網格區 */
.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 24px;
  padding-left: 80px;
}

.footer-col h6 {
  font-weight: 700;
  margin-bottom: 20px;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
}

.footer-col a {
  display: block;
  margin-bottom: 16px;
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  text-decoration-color: rgba(0, 106, 112, 0.8);
  font-size: 0.9rem;
  font-weight: 400;
  transition:
    color 0.2s ease,
    text-decoration-color 0.2s ease,
    transform 0.2s ease;
}

.footer-col a:hover {
  color: var(--primary-container);
  text-decoration-color: var(--primary-container);
}

/* 底部版權區 */
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 24px;
  padding-bottom: 80px;
  border-top: 1px solid var(--outline-variant);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--on-surface-variant);
}

/* 手機版適配 */
@media (max-width: 900px) {
  footer {
    padding: 24px 16px;
    margin-top: 32px;
  }

  .footer-container {
    grid-template-columns: 1fr !important;
    gap: 16px;
    max-width: 100%;
    padding: 0;
  }

  .footer-links-grid {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
    gap: 12px;
    padding-left: 0;
  }

  .footer-col h6 {
    font-size: 1rem;
    margin-bottom: 12px;
  }

  .footer-col a {
    font-size: 0.85rem;
    margin-bottom: 10px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 16px;
    padding-bottom: 96px;
    margin: 24px auto 0;
    font-size: 0.8rem;
  }

  .footer-bottom span,
  .footer-bottom p {
    width: 100%;
    text-align: left;
  }
}

@media (max-width: 900px) {
  .footer-links-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px 12px;
    padding-left: 0;
  }

  .footer-col {
    flex: 1 1 48%;
    min-width: 48%;
    margin-bottom: 12px;
  }

  .footer-col h6 {
    margin-bottom: 8px;
  }

  .footer-col a {
    display: inline-flex;
    align-items: center;
    margin: 0 8px 8px 0;
    white-space: nowrap;
    transition: border-color 0.2s ease;
  }

  .footer-col a:hover {
    border-bottom-color: var(--primary);
  }

  .footer-col a:first-of-type {
    margin-left: 0;
  }

  .footer-col a:last-of-type {
    margin-right: 0;
  }
}