/* ============================================================
   Yuralume — Landing theme
   品牌：神秘宇宙 × 數位靈魂 × 角色甦醒
   參考: 新 logo (藍紫光絲鎧甲框架) + design reference (暗紫星雲卡片)
   ============================================================ */

:root {
  /* === Yuralume brand tokens === */
  --yl-void:      #07041a;   /* 最深底 — 宇宙黑紫 */
  --yl-night:    #100a26;    /* 預設底色 */
  --yl-shadow:   #15102e;    /* surface 0 */
  --yl-surface:  #1d1640;    /* surface 1 (卡片) */
  --yl-surface-2:#2a2257;    /* surface 2 (hover / 浮層) */
  --yl-border:   rgba(186, 167, 255, 0.14);
  --yl-border-2: rgba(186, 167, 255, 0.28);

  --yl-azure:    #5b8cff;    /* 星藍 — 副 accent */
  --yl-violet:   #8b6dff;    /* 星紫 — 主 accent */
  --yl-bloom:    #c98fdb;    /* 粉紫 — 火焰高光 */
  --yl-spark:    #ffd180;    /* 金光 — 中央光點 / 星 */

  --yl-frost:    #f0eafa;    /* 主文字 — 冷暖白偏紫 */
  --yl-frost-2:  #c9c0e4;    /* secondary text */
  --yl-mist:     #8e85b0;    /* muted */
  --yl-dim:      #5d557e;    /* very dim */

  /* glow 漸層, 整個品牌的靈魂 */
  --yl-grad-flame: linear-gradient(180deg, #c98fdb 0%, #8b6dff 45%, #5b8cff 100%);
  --yl-grad-text:  linear-gradient(110deg, #c9c0e4 0%, #ffffff 45%, #c9c0e4 100%);
  --yl-grad-aura:  radial-gradient(circle at center, rgba(139, 109, 255, 0.45), transparent 65%);

  /* === 對齊 base.css 預期 === */
  --color-bg: var(--yl-night);
  --color-surface: var(--yl-surface);
  --color-surface-2: var(--yl-surface-2);
  --color-border: var(--yl-border);
  --color-border-soft: var(--yl-border);
  --color-text: var(--yl-frost);
  --color-text-2: var(--yl-frost-2);
  --color-muted: var(--yl-mist);
  --color-dim: var(--yl-dim);
  --color-accent: var(--yl-violet);
  --color-accent-2: var(--yl-azure);

  --font-display: "Cormorant Garamond", "Marcellus", "Noto Serif TC", serif;
  --font-body: "Inter", "Outfit", -apple-system, "Noto Sans TC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --weight-display: 400;
  --tracking-display: 0;
}

body {
  /* bg.png 是直長條構圖, 上中下都有設計 (花框 / 城市天際線 / 城市倒影).
     用 100% width + auto height 讓整張完整呈現於頁面頂段, 之後過渡到純紫底.
     最下方再放一張水平翻轉的相同圖, 讓 footer 之前也有花框收尾 (見 body::after). */
  background:
    linear-gradient(180deg,
      rgba(16, 10, 38, 0.55) 0%,
      rgba(16, 10, 38, 0.30) 22%,
      rgba(16, 10, 38, 0.55) 55%,
      rgba(16, 10, 38, 0.92) 78%,
      var(--yl-night) 100%),
    radial-gradient(1200px 700px at 80% -10%, rgba(139, 109, 255, 0.22), transparent 60%),
    radial-gradient(900px 600px at 10% 20%, rgba(91, 140, 255, 0.16), transparent 60%),
    url("./assets/bg.png") center top / 100% auto no-repeat,
    var(--yl-night);
  color: var(--yl-frost);
  position: relative;
  overflow-x: hidden;
}

/* 星點 — 用單一 div 配大 box-shadow 比較浪費, 直接上 css mask 不錯但複雜
   這裡用 multiple radial gradient 模擬星點散佈, 不需要 JS */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255, 255, 255, 0.6), transparent),
    radial-gradient(1px 1px at 78% 32%, rgba(255, 209, 128, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 33% 78%, rgba(201, 143, 219, 0.45), transparent),
    radial-gradient(1px 1px at 88% 64%, rgba(91, 140, 255, 0.55), transparent),
    radial-gradient(1px 1px at 22% 52%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 65% 88%, rgba(255, 209, 128, 0.4), transparent),
    radial-gradient(1px 1px at 95% 18%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 5% 80%, rgba(186, 167, 255, 0.5), transparent);
  background-size: 100% 100%;
  z-index: 0;
}

.container { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  color: var(--yl-frost);
  font-weight: 400;
}

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16, 10, 38, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--yl-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand-mark {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(139, 109, 255, 0.6));
}
.brand-text {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.04em;
  background: var(--yl-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links {
  display: flex;
  gap: 32px;
  font-size: 14px;
  color: var(--yl-frost-2);
  letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--yl-bloom); }
.nav-aside {
  display: flex;
  align-items: center;
  gap: 14px;
}
.nav-cta {
  padding: 10px 22px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  border-radius: 999px;
  background: var(--yl-grad-flame);
  color: #fff;
  letter-spacing: 0.04em;
  box-shadow: 0 6px 24px rgba(139, 109, 255, 0.4);
  transition: transform 0.15s, box-shadow 0.15s;
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 32px rgba(139, 109, 255, 0.55);
}
@media (max-width: 800px) { .nav-links { display: none; } }
@media (max-width: 400px) {
  .nav-aside { gap: 8px; }
  .nav-cta { padding: 8px 14px; letter-spacing: 0.02em; }
  .brand { gap: 8px; }
  .brand-text { font-size: 18px; }
}

/* ---------- HERO ---------- */
.hero {
  padding: 120px 0 100px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  border-radius: 999px;
  background: rgba(139, 109, 255, 0.12);
  border: 1px solid var(--yl-border-2);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yl-bloom);
  margin-bottom: 32px;
}
.hero-badge::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--yl-spark);
  box-shadow: 0 0 12px var(--yl-spark);
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  color: var(--yl-frost);
}
.hero h1 em {
  font-style: normal;
  background: var(--yl-grad-flame);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lede {
  font-size: 18px;
  line-height: 1.7;
  color: var(--yl-frost-2);
  max-width: 40ch;
  font-weight: 300;
}
.hero-cta {
  display: flex;
  gap: 14px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 999px;
  letter-spacing: 0.04em;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.btn-primary {
  background: var(--yl-grad-flame);
  color: #fff;
  box-shadow: 0 8px 28px rgba(139, 109, 255, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(139, 109, 255, 0.55);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--yl-border-2);
  color: var(--yl-frost);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--yl-bloom);
}

.hero-meta {
  display: flex;
  gap: 28px;
  margin-top: 56px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yl-mist);
}
.hero-meta span::before {
  content: "◆ ";
  color: var(--yl-violet);
  margin-right: 4px;
}

/* hero art: main 主視覺 + 浮動角色卡 */
.hero-art {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 600px;
}
.hero-art::before {
  content: "";
  position: absolute;
  inset: 8%;
  background: radial-gradient(circle at center, rgba(139, 109, 255, 0.35), transparent 65%);
  filter: blur(50px);
  z-index: 0;
}
.hero-art img.logo {
  position: relative;
  z-index: 1;
  max-width: 520px;
  width: 100%;
  filter: drop-shadow(0 0 44px rgba(170, 130, 255, 0.45));
  /* 邊緣以 radial mask 漸隱融入背景, 上下保留更多空間避免火焰末端被切.
     center 100% opaque → 65% 仍 opaque → 100% transparent. */
  -webkit-mask-image: radial-gradient(ellipse 78% 92% at center, #000 55%, transparent 100%);
  mask-image: radial-gradient(ellipse 50% 58% at center, #000 55%, transparent 100%);
}

/* 浮動角色 — 環繞中央 logo */
.float-char {
  position: absolute;
  z-index: 2;
  border-radius: 24px;
  overflow: hidden;
  border: 2px solid var(--yl-border-2);
  box-shadow:
    0 12px 36px rgba(0, 0, 0, 0.4),
    0 0 24px rgba(139, 109, 255, 0.35);
  backdrop-filter: blur(8px);
  background: rgba(29, 22, 64, 0.4);
}
.float-char img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.float-char.f1 {
  top: 4%;
  right: 0;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  animation: float-a 7s ease-in-out infinite;
}
.float-char.f2 {
  bottom: 14%;
  left: -4%;
  width: 120px;
  height: 120px;
  border-radius: 22px;
  animation: float-b 8s ease-in-out infinite 1s;
}
.float-char.f3 {
  bottom: 0;
  right: 12%;
  width: 110px;
  height: 110px;
  border-radius: 22px;
  animation: float-a 7.5s ease-in-out infinite 0.5s;
}
@keyframes float-a {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-12px) rotate(1deg); }
}
@keyframes float-b {
  0%, 100% { transform: translateY(0) rotate(2deg); }
  50% { transform: translateY(-10px) rotate(-1deg); }
}
.float-char .badge {
  position: absolute;
  bottom: 6px; left: 6px; right: 6px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yl-frost);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.8);
  text-align: center;
  pointer-events: none;
}
@media (max-width: 900px) {
  .float-char.f1, .float-char.f2, .float-char.f3 {
    width: 90px; height: 90px;
  }
}

/* ---------- 生態與市場 ---------- */
.scenes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
@media (max-width: 1000px) { .scenes { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .scenes { grid-template-columns: 1fr; } }
.scene {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--yl-border);
  cursor: pointer;
  transition: transform 0.25s, border-color 0.25s;
}
.scene:hover {
  transform: translateY(-4px);
  border-color: var(--yl-border-2);
}
.scene img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s;
}
.scene:hover img { transform: scale(1.06); }
.scene::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    rgba(16, 10, 38, 0.05) 0%,
    rgba(16, 10, 38, 0.4) 45%,
    rgba(16, 10, 38, 0.92) 100%);
  pointer-events: none;
}
.scene-body {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 24px 22px 22px;
  z-index: 1;
}
.scene-body .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yl-bloom);
  margin-bottom: 8px;
}
.scene-body h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 8px;
  color: var(--yl-frost);
  line-height: 1.2;
}
.scene-body p {
  font-size: 13px;
  color: var(--yl-frost-2);
  line-height: 1.6;
  font-weight: 300;
}

/* ---------- 底部 CTA 滿版背景 + 文字疊上 ---------- */
.outro {
  margin-top: 60px;
  padding: 0;
  position: relative;
}
.outro::before { display: none; } /* 覆寫原本的 radial overlay */
.outro-banner {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.outro-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
}
.outro-overlay {
  position: absolute;
  inset: 0;
  /* 兩層 gradient: 整體深紫色調 + 中間略亮形成 vignette 反向, 讓文字區清晰 */
  background:
    linear-gradient(180deg,
      rgba(16, 10, 38, 0.55) 0%,
      rgba(16, 10, 38, 0.35) 50%,
      rgba(16, 10, 38, 0.85) 100%),
    radial-gradient(900px 400px at 50% 50%, rgba(139, 109, 255, 0.18), transparent 60%);
  z-index: 1;
}
.outro-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 96px 24px;
  max-width: 720px;
}
.outro-inner .eyebrow {
  color: var(--yl-bloom);
  text-shadow: 0 2px 12px rgba(16, 10, 38, 0.9);
}
.outro-inner h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 5.5vw, 64px);
  line-height: 1.15;
  margin-bottom: 22px;
  color: var(--yl-frost);
  text-shadow: 0 4px 24px rgba(16, 10, 38, 0.95);
}
.outro-inner h2 em {
  font-style: normal;
  background: var(--yl-grad-flame);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.outro-inner p {
  font-size: 17px;
  color: var(--yl-frost-2);
  max-width: 52ch;
  margin: 0 auto 36px;
  line-height: 1.7;
  font-weight: 300;
  text-shadow: 0 2px 12px rgba(16, 10, 38, 0.9);
}
.outro-inner .btns {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
@media (max-width: 600px) {
  .outro-banner { min-height: 460px; }
  .outro-inner { padding: 64px 20px; }
}

/* ---------- 共用 section / heading ---------- */
.section {
  padding: 100px 0;
  position: relative;
}
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--yl-bloom);
  margin-bottom: 18px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.005em;
  margin-bottom: 18px;
  color: var(--yl-frost);
}
.section-head h2 em {
  font-style: normal;
  background: var(--yl-grad-flame);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.section-head p {
  color: var(--yl-frost-2);
  font-size: 17px;
  line-height: 1.65;
  font-weight: 300;
}

/* ---------- glass card 基底 ---------- */
.glass {
  background: linear-gradient(180deg, rgba(42, 34, 87, 0.5), rgba(29, 22, 64, 0.3));
  border: 1px solid var(--yl-border);
  border-radius: 18px;
  backdrop-filter: blur(20px);
  transition: border-color 0.2s, transform 0.2s;
}
.glass:hover {
  border-color: var(--yl-border-2);
  transform: translateY(-3px);
}

/* ---------- 六大特色 grid ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .features { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .features { grid-template-columns: 1fr; } }
.feat {
  padding: 30px 26px;
}
.feat .ic {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(139, 109, 255, 0.2), rgba(91, 140, 255, 0.1));
  border: 1px solid var(--yl-border-2);
  display: grid;
  place-items: center;
  font-size: 22px;
  margin-bottom: 22px;
  color: var(--yl-bloom);
}
.feat h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.005em;
  margin-bottom: 10px;
}
.feat p {
  font-size: 14px;
  color: var(--yl-frost-2);
  line-height: 1.7;
  font-weight: 300;
}

/* ---------- Demo placeholders ---------- */
.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 980px) { .demo-grid { grid-template-columns: 1fr; } }
.demo-card {
  padding: 18px;
}
.demo-frame {
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  border: 1px solid var(--yl-border-2);
  background:
    linear-gradient(135deg, rgba(91, 140, 255, 0.16), rgba(201, 143, 219, 0.08)),
    rgba(7, 4, 26, 0.56);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  overflow: hidden;
  position: relative;
}
.demo-frame::before {
  content: "";
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 30px rgba(139, 109, 255, 0.35);
}
.demo-frame::after {
  content: "";
  position: absolute;
  border-left: 13px solid var(--yl-frost);
  border-top: 9px solid transparent;
  border-bottom: 9px solid transparent;
  transform: translateX(3px);
  opacity: 0.88;
}
.demo-frame span {
  position: absolute;
  bottom: 18px;
  left: 18px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--yl-mist);
  text-align: center;
}
.demo-card h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 10px;
}
.demo-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--yl-frost-2);
  font-weight: 300;
}

/* ---------- 角色如何活著 三步驟 ---------- */
.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
}
@media (max-width: 900px) { .flow { grid-template-columns: 1fr; } }
.flow-step {
  padding: 32px 28px;
  position: relative;
}
.flow-step .num {
  position: absolute;
  top: 24px; right: 26px;
  font-family: var(--font-display);
  font-size: 72px;
  font-weight: 400;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(139, 109, 255, 0.35);
  letter-spacing: -0.02em;
}
.flow-step h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 14px;
  position: relative;
}
.flow-step p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--yl-frost-2);
  font-weight: 300;
}
.flow-step ul {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 8px;
}
.flow-step li {
  font-size: 13px;
  color: var(--yl-mist);
  padding-left: 18px;
  position: relative;
}
.flow-step li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--yl-violet);
}

/* ---------- 開源 vs Cloud 並列 ---------- */
.tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 900px) { .tiers { grid-template-columns: 1fr; } }
.tier {
  padding: 40px 32px;
}
.tier .tier-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.tier.open .tier-tag {
  color: var(--yl-azure);
  background: rgba(91, 140, 255, 0.14);
  border: 1px solid rgba(91, 140, 255, 0.35);
}
.tier.cloud .tier-tag {
  color: var(--yl-bloom);
  background: rgba(201, 143, 219, 0.14);
  border: 1px solid rgba(201, 143, 219, 0.35);
}
.tier h3 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  margin-bottom: 10px;
}
.tier .tier-lede {
  color: var(--yl-frost-2);
  font-size: 15px;
  line-height: 1.65;
  margin-bottom: 24px;
  font-weight: 300;
}
.tier ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.tier li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--yl-frost);
  font-weight: 300;
}
.tier li::before {
  content: "✦";
  color: var(--yl-spark);
  flex-shrink: 0;
}

/* ---------- alpha cards ---------- */
.alpha-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .alpha-grid { grid-template-columns: 1fr; } }
.alpha-card {
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.alpha-card.featured {
  border: 1px solid var(--yl-border-2);
  background:
    radial-gradient(circle at 30% 0%, rgba(201, 143, 219, 0.18), transparent 55%),
    linear-gradient(180deg, rgba(42, 34, 87, 0.7), rgba(29, 22, 64, 0.4));
}
.status-pill {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yl-spark);
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(255, 209, 128, 0.12);
  border: 1px solid rgba(255, 209, 128, 0.35);
  margin-bottom: 18px;
}
.alpha-card h3 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  margin-bottom: 12px;
}
.alpha-card p {
  color: var(--yl-frost-2);
  font-size: 14.5px;
  line-height: 1.7;
  font-weight: 300;
  margin-bottom: 22px;
}
.alpha-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  flex: 1;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--yl-frost);
}
.alpha-card li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 300;
}
.alpha-card li::before {
  content: "✦";
  color: var(--yl-violet);
  flex-shrink: 0;
  margin-top: 2px;
}
.alpha-card .btn {
  width: 100%;
  justify-content: center;
}

/* ---------- roadmap ---------- */
.roadmap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
@media (max-width: 1000px) { .roadmap { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .roadmap { grid-template-columns: 1fr; } }
.roadmap-step {
  padding: 30px 24px;
}
.roadmap-step span {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--yl-bloom);
  margin-bottom: 14px;
}
.roadmap-step h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 10px;
}
.roadmap-step p {
  color: var(--yl-frost-2);
  font-size: 14px;
  line-height: 1.7;
  font-weight: 300;
}

/* ---------- 底部大 CTA ---------- */
.outro {
  text-align: center;
  padding: 120px 0;
  position: relative;
}
.outro::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(800px 400px at 50% 50%, rgba(139, 109, 255, 0.25), transparent 60%);
  filter: blur(20px);
  z-index: 0;
}
.outro-inner {
  position: relative;
  z-index: 1;
}
.outro h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.1;
  margin-bottom: 24px;
}
.outro h2 em {
  font-style: normal;
  background: var(--yl-grad-flame);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.outro p {
  font-size: 18px;
  color: var(--yl-frost-2);
  max-width: 50ch;
  margin: 0 auto 40px;
  line-height: 1.65;
  font-weight: 300;
}

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--yl-border);
  padding: 80px 0 40px;
  font-size: 13.5px;
  color: var(--yl-mist);
  margin-top: 40px;
  position: relative;
  z-index: 1;
  background: rgba(7, 4, 26, 0.6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--yl-frost-2);
  margin-bottom: 18px;
  font-weight: 500;
}
.footer-grid a {
  display: block;
  padding: 5px 0;
  color: var(--yl-mist);
  transition: color 0.15s;
}
.footer-grid a:hover { color: var(--yl-bloom); }
.footer-brand img {
  width: 56px;
  height: 56px;
  margin-bottom: 18px;
  display: block;
  filter: drop-shadow(0 0 16px rgba(139, 109, 255, 0.5));
}
.footer-brand .name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  background: var(--yl-grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}
.footer-brand .tagline {
  font-size: 13px;
  color: var(--yl-mist);
  max-width: 30ch;
  line-height: 1.65;
}
.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--yl-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--yl-dim);
}
.footer-bottom .credo {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yl-violet);
}

/* ---------- language switch (預留, 未來補 EN 版) ---------- */
.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--yl-frost-2);
  border: 1px solid var(--yl-border-2);
  background: rgba(255, 255, 255, 0.04);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.lang-switch:hover {
  color: var(--yl-bloom);
  border-color: var(--yl-bloom);
  background: rgba(201, 143, 219, 0.08);
}