/* ============================================================
   BASE — 全站共用：色票、導覽列、按鈕、頁尾、通用元件
   主題：純黑 #000000 × 粉 #FF7CA2
   ============================================================ */

:root {
  --font-body: 'Inter', 'Noto Sans TC', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --nav-h: 64px;
  --radius: 12px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --t: .22s var(--ease);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #000000;
  --bg-1: #08080a;
  --bg-2: #101014;
  --bg-3: #17171c;
  --line: rgba(255, 255, 255, .09);
  --line-2: rgba(255, 255, 255, .16);
  --text: #f5f3f4;
  --text-2: #aaa6a9;
  --text-3: #6d696d;
  --accent: #FF7CA2;
  --accent-hi: #ffa3bd;
  --accent-ink: #1a0610;            /* 粉色底上的文字 */
  --accent-soft: rgba(255, 124, 162, .10);
  --accent-line: rgba(255, 124, 162, .32);
  --accent-glow: rgba(255, 124, 162, .42);
  --glass: rgba(255, 255, 255, .055);
  --glass-hi: rgba(255, 255, 255, .10);
  --glass-line: rgba(255, 255, 255, .15);
  --nav-bg: rgba(0, 0, 0, .55);
  --danger: #ff8f8f;
  --danger-soft: rgba(255, 110, 110, .09);
  --danger-line: rgba(255, 110, 110, .28);
  --ok: #5eead4;
  --grid-dot: rgba(255, 255, 255, .06);
  --scroll: #2a2a30;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #ffffff;
  --bg-1: #f7f6f7;
  --bg-2: #efedef;
  --bg-3: #e6e3e6;
  --line: rgba(0, 0, 0, .09);
  --line-2: rgba(0, 0, 0, .17);
  --text: #0b0b0c;
  --text-2: #55525a;
  --text-3: #8d8991;
  --accent: #e23d72;                /* #FF7CA2 加深，確保白底文字對比度 */
  --accent-hi: #c42b5e;
  --accent-ink: #ffffff;
  --accent-soft: rgba(226, 61, 114, .08);
  --accent-line: rgba(226, 61, 114, .30);
  --accent-glow: rgba(255, 124, 162, .55);
  --glass: rgba(0, 0, 0, .04);
  --glass-hi: rgba(0, 0, 0, .075);
  --glass-line: rgba(0, 0, 0, .13);
  --nav-bg: rgba(255, 255, 255, .62);
  --danger: #c0353f;
  --danger-soft: rgba(192, 53, 63, .07);
  --danger-line: rgba(192, 53, 63, .26);
  --ok: #0f9d8a;
  --grid-dot: rgba(0, 0, 0, .07);
  --scroll: #cfcbd0;
}

/* ───── Reset ───── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--t), color var(--t);
}
body.no-scroll { overflow: hidden; }
a { color: inherit; }
img { max-width: 100%; }
button { font: inherit; color: inherit; }
ul { list-style: none; }
code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-line);
  padding: .08em .45em;
  border-radius: 6px;
}
kbd {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--text-3);
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 .4em;
  line-height: 1.5;
}
::selection { background: var(--accent); color: var(--accent-ink); }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--scroll); border-radius: 99px; }
::-webkit-scrollbar-track { background: transparent; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* ───── 通用小元件 ───── */
.mono-label {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-3);
}
.mono { font-family: var(--font-mono); }

.glass {
  background: var(--glass);
  border: 1px solid var(--glass-line);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08);
}

.spinner {
  width: 28px; height: 28px;
  border: 2px solid var(--line-2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-3);
  flex-shrink: 0;
}
.status-dot.online { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent), 0 0 10px var(--ok); }
.status-dot.offline { background: var(--danger); box-shadow: 0 0 0 3px var(--danger-soft), 0 0 10px var(--danger); }

.toast {
  position: fixed; left: 50%; bottom: 28px;
  transform: translate(-50%, 16px);
  opacity: 0; pointer-events: none;
  z-index: 400;
  padding: .55rem 1.1rem;
  border-radius: 99px;
  font-size: .85rem;
  background: var(--bg-2);
  border: 1px solid var(--accent-line);
  color: var(--text);
  box-shadow: 0 8px 30px rgba(0, 0, 0, .35);
  transition: opacity .2s, transform .2s var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ───── 按鈕 ───── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font-family: inherit; font-size: .92rem; font-weight: 600;
  padding: .7rem 1.4rem;
  border-radius: 99px;
  border: 1px solid transparent;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: transform var(--t), background var(--t), border-color var(--t), box-shadow var(--t), color var(--t);
}
.btn:active { transform: translateY(1px) scale(.98); }
.btn-sm { font-size: .8rem; padding: .42rem .95rem; }
.btn-lg { font-size: 1rem; padding: .85rem 1.9rem; }
.btn:disabled { opacity: .55; cursor: default; }

.btn-glass {
  color: var(--text);
  background: var(--glass);
  border-color: var(--glass-line);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .09);
}
.btn-glass:hover:not(:disabled) {
  background: var(--glass-hi);
  border-color: var(--accent-line);
  color: var(--accent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 0 0 4px var(--accent-soft);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-hi); box-shadow: 0 6px 28px var(--accent-glow); transform: translateY(-1px); }

.icon-btn {
  width: 38px; height: 38px; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 99px; cursor: pointer; text-decoration: none;
  color: var(--text-2);
  transition: color var(--t), border-color var(--t), background var(--t), box-shadow var(--t);
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent-line); background: var(--glass-hi); box-shadow: 0 0 0 4px var(--accent-soft); }

/* ───── 邀請機器人：流光邊框 + 呼吸光暈 + 掃光 + 星芒 ───── */
@property --ang { syntax: '<angle>'; inherits: false; initial-value: 0deg; }

.invite-btn {
  position: relative; isolation: isolate;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: .86rem; font-weight: 700; letter-spacing: .02em;
  padding: .5rem 1.25rem;
  border-radius: 99px;
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent-hi), var(--accent) 55%, #ff5c8a);
  text-decoration: none; white-space: nowrap; flex-shrink: 0;
  box-shadow: 0 0 18px var(--accent-glow), 0 0 44px color-mix(in srgb, var(--accent) 28%, transparent), inset 0 1px 0 rgba(255, 255, 255, .55);
  animation: invite-breathe 2.8s ease-in-out infinite;
  transition: transform var(--t), filter var(--t);
}
/* 旋轉的流光描邊 */
.invite-btn::before {
  content: ''; position: absolute; inset: -2px; z-index: -1; border-radius: inherit;
  background: conic-gradient(from var(--ang), transparent 0 55%, #fff 75%, var(--accent-hi) 85%, transparent 100%);
  animation: invite-spin 2.4s linear infinite;
  filter: blur(.5px);
}
/* 外圈擴散 */
.invite-btn::after {
  content: ''; position: absolute; inset: 0; z-index: -2; border-radius: inherit;
  background: var(--accent);
  animation: invite-ring 2.4s ease-out infinite;
}
.invite-label { position: relative; z-index: 1; }
.invite-shine {
  position: absolute; inset: 0; border-radius: inherit; overflow: hidden; pointer-events: none;
}
.invite-shine::before {
  content: ''; position: absolute; top: 0; bottom: 0; width: 38%; left: -60%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .75), transparent);
  transform: skewX(-20deg);
  animation: invite-sweep 3.2s ease-in-out infinite;
}
.spark {
  position: absolute; z-index: 2; width: 9px; height: 9px; pointer-events: none;
  background: #fff;
  clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
  filter: drop-shadow(0 0 4px var(--accent-hi));
  opacity: 0;
  animation: spark 2.6s ease-in-out infinite;
}
.spark.s1 { top: -6px; right: 14%; animation-delay: 0s; }
.spark.s2 { bottom: -7px; left: 18%; width: 7px; height: 7px; animation-delay: .9s; }
.spark.s3 { top: -3px; left: 46%; width: 6px; height: 6px; animation-delay: 1.7s; }
.invite-btn:hover { transform: translateY(-2px) scale(1.04); filter: brightness(1.08); }
.invite-btn:active { transform: scale(.98); }
.invite-btn.lg { font-size: 1.02rem; padding: .85rem 2.2rem; }

@keyframes invite-spin { to { --ang: 360deg; } }
@keyframes invite-breathe {
  0%, 100% { box-shadow: 0 0 14px var(--accent-glow), 0 0 34px color-mix(in srgb, var(--accent) 22%, transparent), inset 0 1px 0 rgba(255, 255, 255, .55); }
  50%      { box-shadow: 0 0 26px var(--accent-glow), 0 0 64px color-mix(in srgb, var(--accent) 45%, transparent), inset 0 1px 0 rgba(255, 255, 255, .55); }
}
@keyframes invite-ring { 0% { transform: scale(1); opacity: .5; } 100% { transform: scale(1.35, 1.7); opacity: 0; } }
@keyframes invite-sweep { 0%, 55% { left: -60%; } 100% { left: 130%; } }
@keyframes spark { 0%, 100% { opacity: 0; transform: scale(.2) rotate(0); } 40% { opacity: 1; transform: scale(1) rotate(45deg); } 70% { opacity: 0; transform: scale(.4) rotate(90deg); } }

/* ───── 導覽列 ───── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0 1.5rem;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(22px) saturate(170%);
  backdrop-filter: blur(22px) saturate(170%);
  border-bottom: 1px solid var(--line);
}
.nav-brand {
  display: flex; align-items: center; gap: .65rem;
  font-weight: 700; font-size: 1rem; letter-spacing: .01em;
  text-decoration: none; color: var(--text); white-space: nowrap;
}
.nav-logo { width: 30px; height: 30px; border-radius: 50%; object-fit: cover; border: 1px solid var(--accent-line); }
.nav-right { display: flex; align-items: center; gap: .6rem; }

.nav-links {
  display: flex; align-items: center; gap: .15rem;
  padding: 4px; border-radius: 99px;
}
.nav-link {
  position: relative;
  font-size: .84rem; font-weight: 500;
  padding: .38rem .9rem; border-radius: 99px;
  color: var(--text-2); text-decoration: none; white-space: nowrap;
  transition: color var(--t), background var(--t);
}
.nav-link:hover { color: var(--text); background: var(--glass-hi); }
.nav-link.active { color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent-line); }

.nav-burger { display: none; flex-direction: column; gap: 4px; padding: 0; }
.nav-burger span { display: block; width: 15px; height: 1.5px; background: currentColor; border-radius: 2px; transition: transform var(--t), opacity var(--t); }
.nav-burger.open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.mobile-menu {
  position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 99;
  display: none; flex-direction: column; gap: .3rem;
  padding: .8rem 1rem 1.2rem;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(24px) saturate(170%);
  backdrop-filter: blur(24px) saturate(170%);
  border-bottom: 1px solid var(--line);
}
.mobile-menu.open { display: flex; animation: drop .22s var(--ease); }
.mobile-menu .nav-link { padding: .7rem 1rem; font-size: .95rem; border-radius: 10px; }
.mobile-menu .invite-btn { margin-top: .7rem; align-self: stretch; }
@keyframes drop { from { opacity: 0; transform: translateY(-8px); } }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
}
@media (max-width: 560px) {
  .navbar { padding: 0 .9rem; }
  .nav-brand span { font-size: .9rem; }
  .nav-right > .invite-btn { display: none; }
}

/* ───── 導覽列下拉選單（小工具） ───── */
.nav-item { position: relative; display: flex; }
.nav-item.has-menu > .nav-link::after {
  content: ''; display: inline-block; width: 5px; height: 5px; margin-left: .45rem; vertical-align: .12em;
  border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg); transition: transform var(--t);
}
.nav-item.has-menu:hover > .nav-link::after,
.nav-item.has-menu:focus-within > .nav-link::after { transform: rotate(225deg) translate(-1px, -1px); }
.nav-menu {
  position: absolute; top: 100%; left: 50%; min-width: 220px; margin-top: 10px; padding: 6px;
  display: grid; gap: 2px; border-radius: 16px;
  -webkit-backdrop-filter: blur(24px) saturate(170%); backdrop-filter: blur(24px) saturate(170%);
  background: color-mix(in srgb, var(--bg) 90%, transparent); box-shadow: 0 24px 60px -24px rgba(0, 0, 0, .7), 0 0 0 1px var(--glass-line);
  opacity: 0; visibility: hidden; transform: translate(-50%, -6px);
  transition: opacity var(--t), transform var(--t), visibility 0s linear .22s;
}
/* 透明的橋，避免滑鼠從按鈕移到選單的縫隙中途關閉 */
.nav-menu::before { content: ''; position: absolute; left: 0; right: 0; top: -12px; height: 12px; }
.nav-item.has-menu:hover > .nav-menu,
.nav-item.has-menu:focus-within > .nav-menu { opacity: 1; visibility: visible; transform: translate(-50%, 0); transition-delay: 0s; }
.nav-sub { display: grid; gap: .1rem; padding: .6rem .85rem; border-radius: 11px; text-decoration: none; color: var(--text); transition: background var(--t); }
.nav-sub:hover, .nav-sub:focus-visible { background: var(--accent-soft); }
.nav-sub-name { font-size: .88rem; font-weight: 600; }
.nav-sub-desc { font-size: .75rem; color: var(--text-3); }
.nav-sub:hover .nav-sub-name { color: var(--accent); }
.nav-sub.active .nav-sub-name { color: var(--accent); }
/* 手機選單：小工具 = 連結 + 右側 v 展開鈕；子選單預設收合，按 v 才展開 */
.mobile-menu .m-row { display: flex; align-items: stretch; gap: .3rem; }
.mobile-menu .m-row .nav-link { flex: 1; min-width: 0; }
.m-toggle {
  position: relative; flex-shrink: 0; width: 46px; cursor: pointer; border-radius: 10px;
  color: var(--text-2); background: transparent; border: 0; transition: color var(--t), background var(--t);
}
.m-toggle:hover, .m-toggle[aria-expanded="true"] { color: var(--accent); background: var(--accent-soft); }
.m-toggle span {
  position: absolute; top: 50%; left: 50%; width: 8px; height: 8px; margin: -6px 0 0 -4px;
  border-right: 1.8px solid currentColor; border-bottom: 1.8px solid currentColor;
  transform: rotate(45deg); transition: transform var(--t);
}
.m-toggle[aria-expanded="true"] span { transform: rotate(225deg) translate(-2px, -2px); }
.mobile-menu .nav-sub-list { display: grid; gap: 2px; margin: 0 0 .3rem 1rem; padding-left: .8rem; border-left: 1px solid var(--accent-line); }
.mobile-menu .nav-sub-list[hidden] { display: none; }
.mobile-menu .nav-sub-list:not([hidden]) { animation: drop .2s var(--ease); }
.mobile-menu .nav-sub { padding: .55rem .8rem; }

/* ───── 頁面容器 ───── */
#view { min-height: 100vh; padding-top: var(--nav-h); }
.page { animation: page-in .45s var(--ease); }
@keyframes page-in { from { opacity: 0; transform: translateY(8px); } }

.page-error { display: grid; place-items: center; min-height: 60vh; padding: 2rem 1.5rem; }
.error-card { text-align: center; max-width: 420px; display: grid; gap: .8rem; justify-items: center; }
.error-card p:not(.mono-label) { color: var(--text-2); font-size: .9rem; word-break: break-word; }

/* ───── 頁尾 ───── */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-1); padding: 2rem 1.5rem; }
.footer-inner {
  max-width: 1040px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 1.5rem; align-items: start;
}
.footer-left { display: grid; gap: 1rem; justify-items: start; }
.footer-born { display: grid; gap: .15rem; }
.born-counter { font-family: var(--font-mono); font-size: .86rem; font-weight: 500; color: var(--accent); font-variant-numeric: tabular-nums; }
.footer-copy { font-size: .78rem; color: var(--text-3); white-space: nowrap; }
.footer-center { display: grid; gap: .2rem; justify-items: center; text-align: center; }
.footer-rights { font-size: .74rem; color: var(--text-3); letter-spacing: .02em; }
.footer-visits { margin-top: .5rem; display: flex; gap: .5rem; align-items: baseline; justify-content: center; }
.visit-counter { font-family: var(--font-mono); font-size: .8rem; color: var(--accent); font-variant-numeric: tabular-nums; }
.footer-right { display: grid; gap: .3rem; justify-items: end; }
.footer-right a { font-size: .8rem; color: var(--text-3); text-decoration: none; transition: color var(--t); }
.footer-right a:hover { color: var(--accent); }
/* 手機：第一列「加入支援群」靠左、「法律條款」靠右；其下置中「版權宣告 + 累計造訪」，最後是「機器人已誕生」 */
@media (max-width: 720px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas: "support legal" "center center" "born born";
    gap: 1.4rem 1rem; align-items: start;
  }
  .footer-left { display: contents; }
  .footer-left > .btn { grid-area: support; justify-self: start; }
  .footer-right { grid-area: legal; justify-items: end; text-align: right; }
  .footer-center { grid-area: center; padding-top: 1.2rem; border-top: 1px solid var(--line); }
  .footer-born { grid-area: born; justify-items: center; text-align: center; }
}
@media (max-width: 380px) {
  .footer-left > .btn { white-space: normal; text-align: left; line-height: 1.4; }
}

/* ───── 區塊標題（多頁共用） ───── */
.section-head { text-align: center; display: grid; gap: .5rem; margin-bottom: 3rem; justify-items: center; }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); font-weight: 700; letter-spacing: -.01em; line-height: 1.25; }
.section-head p:last-child { color: var(--text-3); font-size: .95rem; }