/* ============================================================
   Chalculate 官网样式 — 液态玻璃设计系统
   语言: 纯 CSS + 自定义属性（无框架）；RTL 用逻辑属性天然适配
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --bg: #0b0c10;
  --bg-2: #101218;
  --panel: rgba(255, 255, 255, 0.055);
  --panel-strong: rgba(255, 255, 255, 0.09);
  --line: rgba(255, 255, 255, 0.12);
  --line-soft: rgba(255, 255, 255, 0.08);
  --text: #f5f5f7;
  --muted: #a2a3ad;
  --accent: #f7871f;
  --accent-2: #ff9a3d;
  --accent-grad: linear-gradient(135deg, #ffb35c, #f7871f 55%, #ef6c12);
  --red: #f0483f;
  --red-grad: linear-gradient(180deg, #ff6a5b, #e93a30);
  --radius-lg: 28px;
  --radius-md: 18px;
  --nav-h: 64px;
  --shadow-phone: 0 40px 90px -20px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --ease: cubic-bezier(0.22, 0.8, 0.3, 1);
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Noto Sans SC", "Noto Sans Arabic", "Noto Sans Thai", "Noto Sans Devanagari", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: rgba(247, 135, 31, 0.35); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed; inset-inline-start: 16px; top: -48px; z-index: 200;
  background: var(--accent); color: #17181c; padding: 8px 16px; border-radius: 10px;
  font-weight: 600; transition: top 0.2s;
}
.skip-link:focus { top: 12px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 24px; border-radius: 999px; font-weight: 600; font-size: 0.95rem;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--accent-grad); color: #17181c;
  box-shadow: 0 8px 24px -8px rgba(247, 135, 31, 0.55);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 32px -8px rgba(247, 135, 31, 0.6); }
.btn-ghost { background: var(--panel); border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { background: var(--panel-strong); transform: translateY(-2px); }
.btn-sm { padding: 9px 18px; font-size: 0.88rem; }
.btn-block { width: 100%; }
.btn-store {
  background: #000; color: #fff; border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 16px; padding: 10px 26px; gap: 12px;
}
.btn-store:hover { transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.5); }
.btn-store span { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.15; }
.btn-store small { font-size: 0.68rem; opacity: 0.85; font-weight: 400; }
.btn-store strong { font-size: 1.15rem; letter-spacing: 0.01em; }

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset-inline: 0; top: 0; z-index: 100;
  transition: background 0.3s, border-color 0.3s, backdrop-filter 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(11, 12, 16, 0.72);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom-color: var(--line-soft);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; height: var(--nav-h);
  display: flex; align-items: center; gap: 28px; padding: 0 24px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: var(--accent-grad);
  box-shadow: 0 4px 14px -4px rgba(247, 135, 31, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
/* 品牌标直接用真实 App 图标（浅色形态，橙色底在明暗导航上都醒目） */
.brand-mark img { width: 100%; height: 100%; border-radius: 11px; object-fit: cover; display: block; }
.nav-cta .cta-appicon { border-radius: 5px; box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.35); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 1.02rem; letter-spacing: 0.01em; }
.brand-text em { font-style: normal; font-size: 0.72rem; color: var(--muted); }
.nav-links { display: flex; gap: 4px; margin-inline: auto; }
.nav-links a {
  padding: 8px 13px; border-radius: 999px; font-size: 0.9rem; color: var(--muted);
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover { color: var(--text); background: var(--panel); }
.nav-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

/* 语言选择器 */
.lang { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 13px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--panel); font-size: 0.88rem; color: var(--text);
  transition: background 0.2s;
}
.lang-btn:hover { background: var(--panel-strong); }
.lang-btn svg { color: var(--muted); }
.lang-menu {
  position: absolute; inset-inline-end: 0; top: calc(100% + 8px); z-index: 120;
  min-width: 230px; max-height: 380px; overflow: auto; padding: 6px; margin: 0; list-style: none;
  background: rgba(22, 23, 30, 0.92); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--line); border-radius: 16px;
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.7);
}
.lang-menu li {
  padding: 8px 12px; border-radius: 10px; font-size: 0.9rem; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.lang-menu li:hover { background: var(--panel-strong); }
.lang-menu li[aria-selected="true"] { color: var(--accent-2); background: rgba(247, 135, 31, 0.12); }
.lang-menu li small { color: var(--muted); font-size: 0.72rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: clip;
  padding: calc(var(--nav-h) + 72px) 24px 40px;
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(247, 135, 31, 0.13), transparent 60%),
    radial-gradient(900px 480px at 8% 12%, rgba(90, 120, 255, 0.08), transparent 60%),
    var(--bg);
}
.hero-grid {
  max-width: 1180px; margin: 0 auto; display: grid;
  grid-template-columns: 1.04fr 0.96fr; gap: 56px; align-items: center;
}
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; pointer-events: none; }
.orb-a { width: 420px; height: 420px; background: rgba(247, 135, 31, 0.24); top: -120px; inset-inline-end: -80px; animation: drift 16s ease-in-out infinite alternate; }
.orb-b { width: 320px; height: 320px; background: rgba(120, 90, 255, 0.16); bottom: -100px; inset-inline-start: -60px; animation: drift 20s ease-in-out infinite alternate-reverse; }
.orb-c { width: 200px; height: 200px; background: rgba(255, 140, 60, 0.14); top: 40%; inset-inline-start: 42%; animation: drift 24s ease-in-out infinite alternate; }
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(40px, -34px, 0) scale(1.12); }
}

.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px; border-radius: 999px; margin: 0 0 22px;
  background: var(--panel); border: 1px solid var(--line);
  font-size: 0.82rem; color: var(--muted);
}
.badge-dot { width: 7px; height: 7px; border-radius: 50%; background: #3fbf6e; box-shadow: 0 0 0 4px rgba(63, 191, 110, 0.18); animation: pulse 2.4s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 7px rgba(63, 191, 110, 0.08); } }

.hero h1 {
  margin: 0 0 20px; font-size: clamp(2.35rem, 4.6vw, 3.55rem);
  line-height: 1.12; letter-spacing: -0.022em; font-weight: 800;
}
.hero h1 span { display: block; }
.grad {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { margin: 0 0 30px; font-size: 1.13rem; color: var(--muted); max-width: 33em; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 18px; }
.hero-note { font-size: 0.85rem; color: var(--muted); margin: 0; }

/* ---------- 手机演示 ---------- */
.phone-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; perspective: 1200px; }
.phone {
  position: relative; width: min(348px, 92vw);
  background: #08080b; border-radius: 46px; padding: 10px;
  box-shadow: var(--shadow-phone);
  border: 1px solid rgba(255, 255, 255, 0.09);
  transform-style: preserve-3d; will-change: transform;
  transition: transform 0.25s var(--ease);
}
.phone-island {
  position: absolute; top: 20px; inset-inline-start: 50%; transform: translateX(-50%);
  width: 96px; height: 26px; border-radius: 16px; background: #000; z-index: 30;
  border: 1px solid rgba(255, 255, 255, 0.07);
}
[dir="rtl"] .phone-island { transform: translateX(50%); }
/* ===== 聊天皮肤系统：按语言切换当地主流 IM 的界面 ===
   wechat 微信 / line / kakao KakaoTalk / imessage iMessage /
   whatsapp / telegram / messenger / zalo —— 各自标志性配色与细节 */
.chat {
  position: relative; border-radius: 37px; overflow: hidden;
  background: var(--sk-bg, #fff);
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.chat-header {
  display: flex; align-items: center; gap: 9px; padding: 32px 14px 10px;
  background: var(--sk-head-bg, #fff); color: var(--sk-head-text, #111);
  border-bottom: 1px solid var(--sk-head-line, rgba(0, 0, 0, 0.08));
}
.hd-chevron { font-size: 1.5rem; line-height: 0.8; opacity: 0.85; font-weight: 300; }
.chat-avatar {
  width: 30px; height: 30px; border-radius: var(--sk-avatar-radius, 50%);
  display: grid; place-items: center; flex-shrink: 0;
  background: linear-gradient(135deg, #8e52de, #4c7df0); font-weight: 700; font-size: 0.85rem; color: #fff;
}
.chat-name { font-weight: 600; font-size: 0.95rem; }
.chat-status { width: 7px; height: 7px; border-radius: 50%; background: #3fbf6e; margin-inline-start: auto; }
.hd-more { font-size: 1.2rem; opacity: 0.8; letter-spacing: 0.06em; line-height: 1; }
.chat-body {
  display: flex; flex-direction: column; gap: 9px; min-height: 150px;
  padding: 14px 12px; overflow-y: auto; max-height: 224px; scroll-behavior: smooth;
}
.msg {
  max-width: 80%; padding: 8px 12px; border-radius: var(--sk-bub-radius, 16px);
  font-size: 0.92rem; line-height: 1.45; animation: msgIn 0.35s var(--ease) both;
  word-break: break-word; position: relative;
}
.msg-in {
  align-self: flex-start; background: var(--sk-in-bg, #e9e9eb); color: var(--sk-in-text, #111);
  border-start-start-radius: var(--sk-tail, 5px);
}
/* 微信/LINE/Kakao 的消息带头像（仿各自真实布局） */
.msg-in::before {
  content: ""; width: 24px; height: 24px; flex-shrink: 0; align-self: flex-start;
  border-radius: var(--sk-bub-avatar-radius, 0);
  background: linear-gradient(135deg, #f5a55f, #e0784a);
  display: var(--sk-bub-avatar, none);
}
[data-skin="wechat"] .msg-in, [data-skin="line"] .msg-in, [data-skin="kakao"] .msg-in {
  display: flex; gap: 7px; padding-inline-start: 8px; background: transparent;
}
[data-skin="wechat"] .msg-in::before, [data-skin="line"] .msg-in::before, [data-skin="kakao"] .msg-in::before { margin-top: 2px; }
.msg-in > span.bubble {
  display: block; background: var(--sk-in-bg, #e9e9eb); color: var(--sk-in-text, #111);
  border-radius: var(--sk-bub-radius, 16px); border-start-start-radius: var(--sk-tail, 5px);
  padding: 8px 12px;
}
.msg-out {
  align-self: flex-end; background: var(--sk-out-bg, #0a84ff); color: var(--sk-out-text, #fff);
  font-weight: 400; border-start-end-radius: var(--sk-tail, 5px);
}
.msg-thumbs { align-self: flex-start; background: var(--sk-in-bg, #e9e9eb); color: var(--sk-in-text, #111); font-size: 1.1rem; padding: 5px 11px; }
/* WhatsApp 出向气泡的蓝色双勾（仅该皮肤显示） */
.msg-out .ticks { display: none; margin-inline-start: 6px; vertical-align: -2px; color: #53bdeb; }
[data-skin="whatsapp"] .msg-out .ticks { display: inline; }
@keyframes msgIn { from { opacity: 0; transform: translateY(10px) scale(0.96); } to { opacity: 1; transform: none; } }

.chat-inputbar {
  position: relative;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; background: var(--sk-bar-bg, #fff);
  border-block: 1px solid var(--sk-bar-line, rgba(0, 0, 0, 0.06));
}
.chat-input {
  flex: 1; min-height: 32px; display: flex; align-items: center;
  background: var(--sk-field-bg, #f2f2f7); color: var(--sk-field-text, #111);
  border-radius: var(--sk-field-radius, 16px); padding: 5px 12px;
  font-size: 0.95rem; font-variant-numeric: tabular-nums; overflow-x: auto; white-space: nowrap;
}
.caret {
  width: 2px; height: 18px; background: currentColor; opacity: 0.75; border-radius: 1px;
  animation: blink 1.05s steps(1) infinite; flex-shrink: 0;
}
@keyframes blink { 50% { opacity: 0; } }
.send-btn {
  min-width: 32px; height: 32px; border-radius: var(--sk-send-radius, 50%); flex-shrink: 0;
  background: var(--sk-send-bg, #0a84ff); color: var(--sk-send-fg, #fff);
  font-size: 0.85rem; font-weight: 600; padding: 0 9px;
  display: grid; place-items: center; transition: transform 0.15s; line-height: 1;
}

/* --- 各皮肤变量 --- */
[data-skin="wechat"] {
  --sk-bg: #ededed; --sk-head-bg: #ededed; --sk-head-text: #111;
  --sk-head-line: rgba(0,0,0,0.07); --sk-avatar-radius: 6px;
  --sk-in-bg: #ffffff; --sk-in-text: #111; --sk-out-bg: #95ec69; --sk-out-text: #111;
  --sk-bub-radius: 8px; --sk-tail: 2px; --sk-bub-avatar: block; --sk-bub-avatar-radius: 4px;
  --sk-bar-bg: #f7f7f7; --sk-field-bg: #ffffff; --sk-field-radius: 5px;
  --sk-send-bg: #07c160; --sk-send-fg: #fff; --sk-send-radius: 5px;
}
[data-skin="line"] {
  --sk-bg: #aec391; --sk-head-bg: #f7f8f5; --sk-head-text: #111;
  --sk-head-line: rgba(0,0,0,0.08); --sk-avatar-radius: 50%;
  --sk-in-bg: #ffffff; --sk-in-text: #111; --sk-out-bg: #06c755; --sk-out-text: #fff;
  --sk-bub-radius: 13px; --sk-tail: 4px; --sk-bub-avatar: block; --sk-bub-avatar-radius: 50%;
  --sk-bar-bg: #f7f8f5; --sk-field-bg: #ffffff; --sk-field-radius: 19px;
  --sk-send-bg: #06c755; --sk-send-fg: #fff;
}
[data-skin="kakao"] {
  --sk-bg: #b2c7da; --sk-head-bg: #b2c7da; --sk-head-text: #000;
  --sk-head-line: rgba(0,0,0,0.06); --sk-avatar-radius: 50%;
  --sk-in-bg: #ffffff; --sk-in-text: #1a1a1a; --sk-out-bg: #fee500; --sk-out-text: #3a1d1d;
  --sk-bub-radius: 11px; --sk-tail: 3px; --sk-bub-avatar: block; --sk-bub-avatar-radius: 50%;
  --sk-bar-bg: #b2c7da; --sk-field-bg: #ffffff; --sk-field-radius: 19px;
  --sk-send-bg: #fee500; --sk-send-fg: #3a1d1d;
}
[data-skin="imessage"] {
  --sk-bg: #ffffff; --sk-head-bg: rgba(255,255,255,0.94); --sk-head-text: #000;
  --sk-head-line: rgba(0,0,0,0.1); --sk-avatar-radius: 50%;
  --sk-in-bg: #e9e9eb; --sk-in-text: #000; --sk-out-bg: #0a84ff; --sk-out-text: #fff;
  --sk-bub-radius: 17px; --sk-tail: 6px;
  --sk-bar-bg: rgba(255,255,255,0.94); --sk-field-bg: #ffffff; --sk-field-text: #000;
  --sk-field-radius: 17px; --sk-send-bg: #0a84ff; --sk-send-fg: #fff;
}
[data-skin="imessage"] .chat-input { border: 1px solid #d5d5da; }
[data-skin="whatsapp"] {
  --sk-bg: #efe7db; --sk-head-bg: #008069; --sk-head-text: #fff;
  --sk-head-line: rgba(0,0,0,0.1); --sk-avatar-radius: 50%;
  --sk-in-bg: #ffffff; --sk-in-text: #111; --sk-out-bg: #d9fdd3; --sk-out-text: #111;
  --sk-bub-radius: 9px; --sk-tail: 2px;
  --sk-bar-bg: #f0f2f5; --sk-field-bg: #ffffff; --sk-field-radius: 19px;
  --sk-send-bg: #00a884; --sk-send-fg: #fff;
}
[data-skin="whatsapp"] .chat-status { display: none; }
[data-skin="telegram"] {
  --sk-bg: #dbe6ec; --sk-head-bg: rgba(255,255,255,0.92); --sk-head-text: #000;
  --sk-head-line: rgba(0,0,0,0.08); --sk-avatar-radius: 50%;
  --sk-in-bg: #ffffff; --sk-in-text: #000; --sk-out-bg: linear-gradient(180deg, #74b6f8, #3d8af7); --sk-out-text: #fff;
  --sk-bub-radius: 14px; --sk-tail: 5px;
  --sk-bar-bg: rgba(255,255,255,0.92); --sk-field-bg: #ffffff; --sk-field-radius: 19px;
  --sk-send-bg: #3390ec; --sk-send-fg: #fff;
}
[data-skin="messenger"] {
  --sk-bg: linear-gradient(180deg, #b7d3ff, #e4eeff); --sk-head-bg: rgba(255,255,255,0.9);
  --sk-head-text: #000; --sk-head-line: rgba(0,0,0,0.06); --sk-avatar-radius: 50%;
  --sk-in-bg: #f0f2f5; --sk-in-text: #050505;
  --sk-out-bg: linear-gradient(135deg, #0099ff, #a033ff); --sk-out-text: #fff;
  --sk-bub-radius: 17px; --sk-tail: 17px;
  --sk-bar-bg: rgba(255,255,255,0.9); --sk-field-bg: #f0f2f5; --sk-field-radius: 17px;
  --sk-send-bg: #0084ff; --sk-send-fg: #fff;
}
[data-skin="zalo"] {
  --sk-bg: #eef1f5; --sk-head-bg: #0068ff; --sk-head-text: #fff;
  --sk-head-line: rgba(0,0,0,0.1); --sk-avatar-radius: 50%;
  --sk-in-bg: #ffffff; --sk-in-text: #111; --sk-out-bg: #0068ff; --sk-out-text: #fff;
  --sk-bub-radius: 10px; --sk-tail: 3px;
  --sk-bar-bg: #ffffff; --sk-field-bg: #eef1f5; --sk-field-radius: 18px;
  --sk-send-bg: #0068ff; --sk-send-fg: #fff;
}
[data-skin="zalo"] .chat-status { display: none; }
.send-btn:active { transform: scale(0.9); }

/* 键盘 — 还原真机产品 UI（DemoKeyboardCalc 实拍基准，浅色外观）：
   聊天演示均为浅色界面，键盘按真机浅色模式渲染：白键帽 + 浅灰功能键
   （#B4B4BF）+ #E3E3EA 底板；运算符纯橙；= 纯红跨两行；小间距高密度；
   全药丸键帽、纯平无高光 */
.keypad {
  display: grid; grid-template-columns: repeat(5, 1fr); grid-auto-rows: 40px;
  gap: 5px; padding: 8px 8px 14px; position: relative;
  background: #e3e3ea;
}
.key {
  border-radius: 999px; font-size: 1.1rem; font-weight: 400;
  background: #ffffff; color: #1a1a1e;
  display: grid; place-items: center; user-select: none; position: relative;
  transition: transform 0.07s, filter 0.07s;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.key:active, .key.pressed { transform: scale(0.93); filter: brightness(0.92); }
.key.fn { background: #b4b4bf; color: #1a1a1e; }
.key.op { background: #f7871f; color: #fff; font-size: 1.2rem; font-weight: 400; }
.key.eq {
  grid-column: 5; grid-row: 1 / span 2;
  background: #f2453d; color: #fff; font-size: 1.5rem; font-weight: 600;
}
.key[data-k="ac"] { font-size: 1rem; }
.key .gear {
  position: absolute; top: 4px; inset-inline-start: 7px; color: #8b8b96; line-height: 0;
}

/* toast 与历史面板 */
.toast {
  position: absolute; inset-inline: 24px; bottom: 252px; z-index: 20;
  text-align: center; padding: 8px 14px; border-radius: 12px; font-size: 0.84rem;
  background: rgba(30, 30, 36, 0.92); border: 1px solid var(--line);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  animation: msgIn 0.25s var(--ease);
}
.hist-panel {
  position: absolute; inset-inline: 12px; bottom: 10px; z-index: 25;
  background: rgba(252, 252, 254, 0.97); border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 18px; color: #1a1a1e;
  padding: 12px 14px; backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.35); animation: msgIn 0.22s var(--ease);
}
.hist-title { margin: 0 0 8px; font-size: 0.78rem; color: #86868b; text-transform: uppercase; letter-spacing: 0.08em; }
.hist-panel ul { list-style: none; margin: 0; padding: 0; max-height: 108px; overflow: auto; }
.hist-panel li {
  display: flex; justify-content: space-between; gap: 14px; padding: 7px 10px;
  border-radius: 10px; font-size: 0.92rem; font-variant-numeric: tabular-nums; cursor: pointer;
}
.hist-panel li:hover { background: rgba(0, 0, 0, 0.05); }
.hist-panel li .h-res { color: #ef6c12; font-weight: 700; }
.hist-empty { margin: 4px 0; font-size: 0.85rem; color: #86868b; text-align: center; }

.demo-hint { margin: 0; font-size: 0.88rem; color: var(--muted); display: flex; align-items: center; gap: 9px; transition: color 0.3s; }
.demo-hint.attn { color: var(--accent-2); }
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }

/* ---------- 通用 section ---------- */
.section { max-width: 1180px; margin: 0 auto; padding: 96px 24px 8px; }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.section-head h2 { margin: 0 0 14px; font-size: clamp(1.7rem, 3.2vw, 2.5rem); letter-spacing: -0.018em; line-height: 1.2; }
.section-head p { margin: 0; color: var(--muted); font-size: 1.05rem; }
.glass {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}

/* ---------- Stats ---------- */
.stats { max-width: 1180px; margin: 0 auto; padding: 56px 24px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat {
  text-align: center; padding: 26px 12px; border-radius: var(--radius-md);
  background: var(--panel); border: 1px solid var(--line-soft);
}
.stat strong {
  display: block; font-size: 2.3rem; font-weight: 800; letter-spacing: -0.02em;
  background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { font-size: 0.86rem; color: var(--muted); }

/* ---------- Steps ---------- */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; list-style: none; margin: 0; padding: 0; counter-reset: step; }
.step-card { position: relative; padding: 30px 26px 26px; overflow: hidden; transition: transform 0.25s var(--ease), border-color 0.25s; }
.step-card:hover { transform: translateY(-4px); border-color: rgba(247, 135, 31, 0.4); }
.step-num {
  position: absolute; top: -14px; inset-inline-end: 10px; font-size: 5.6rem; font-weight: 800;
  color: transparent; -webkit-text-stroke: 1.5px rgba(247, 135, 31, 0.35); line-height: 1;
  pointer-events: none;
}
.step-card h3 { margin: 0 0 10px; font-size: 1.14rem; }
.step-card p { margin: 0; color: var(--muted); font-size: 0.94rem; }

/* ---------- Features ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { padding: 28px 26px; transition: transform 0.25s var(--ease), border-color 0.25s, background 0.25s; }
.feature:hover { transform: translateY(-4px); border-color: rgba(247, 135, 31, 0.4); background: var(--panel-strong); }
.f-icon {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  background: rgba(247, 135, 31, 0.14); color: var(--accent-2); margin-bottom: 18px;
}
.f-icon svg { width: 24px; height: 24px; }
.feature h3 { margin: 0 0 9px; font-size: 1.1rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* ---------- Theme lab ---------- */
.theme-lab { padding: 26px; }
.theme-stage { display: grid; grid-template-columns: minmax(280px, 420px) 1fr; gap: 34px; align-items: center; }
.theme-shot-wrap {
  border-radius: 22px; overflow: hidden;
  border: 1px solid var(--line-soft);
  background: #101116;
  box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.8);
}
.theme-shot-wrap img { width: 100%; height: auto; display: block; transition: opacity 0.18s var(--ease); }
.theme-shot-wrap img.switching { opacity: 0.25; }
/* 自定义主题演示卡：壁纸渐变 + 由其配色生成的键盘（无实拍图，示意渲染） */
.custom-shot {
  position: relative; aspect-ratio: 640 / 427;
  background:
    radial-gradient(280px 200px at 18% 22%, rgba(245, 165, 95, 0.95), transparent 65%),
    radial-gradient(320px 240px at 82% 30%, rgba(142, 82, 222, 0.9), transparent 65%),
    radial-gradient(300px 260px at 50% 88%, rgba(76, 125, 240, 0.9), transparent 65%),
    linear-gradient(160deg, #2a2340, #171225);
  display: grid; place-items: center; align-content: center; gap: 14px; padding: 20px;
}
.custom-shot[hidden] { display: none; }
.cs-kb {
  width: min(78%, 320px); border-radius: 16px; padding: 10px 10px 12px;
  background: rgba(16, 17, 22, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 18px 44px -14px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.cs-result { text-align: end; padding: 2px 8px 8px; color: #f5f5f7; font-weight: 700; font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.cs-keys { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 26px; gap: 5px; }
.cs-keys span {
  border-radius: 999px; display: grid; place-items: center;
  background: rgba(255, 255, 255, 0.92); color: #1a1a1e; font-size: 0.8rem; font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.cs-keys .cs-op { background: #f7871f; color: #fff; }
.cs-keys .cs-eq { background: #f2453d; color: #fff; grid-column: 1; font-weight: 600; }
.cs-caption {
  margin: 0; color: rgba(255, 255, 255, 0.92); font-size: 0.85rem; font-weight: 600;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45); text-align: center;
}
.theme-side { display: flex; flex-direction: column; gap: 22px; }
.seg {
  display: inline-flex; gap: 4px; padding: 4px; border-radius: 999px;
  background: var(--panel-strong); border: 1px solid var(--line-soft); align-self: flex-start;
}
.seg button { padding: 7px 20px; border-radius: 999px; font-size: 0.88rem; color: var(--muted); transition: all 0.2s; }
.seg button[aria-selected="true"] { background: var(--accent-grad); color: #17181c; font-weight: 600; }
.theme-meta h3 { margin: 0 0 8px; font-size: 1.5rem; letter-spacing: -0.01em; }
.theme-meta p { margin: 0; color: var(--muted); font-size: 0.95rem; min-height: 3em; }
.theme-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; justify-content: center; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px;
  border-radius: 999px; border: 1px solid var(--line); background: var(--panel);
  font-size: 0.88rem; color: var(--muted); transition: all 0.2s;
}
.chip .dot { width: 11px; height: 11px; border-radius: 50%; background: var(--dot, var(--accent)); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4); }
.chip:hover { color: var(--text); transform: translateY(-1px); }
.chip[aria-selected="true"] {
  color: var(--text); border-color: var(--accent);
  background: rgba(247, 135, 31, 0.13); box-shadow: 0 0 0 1px var(--accent) inset;
}

/* ---------- Privacy ---------- */
.privacy-inner {
  max-width: 1080px; margin: 0 auto; padding: 72px 40px 64px; text-align: center;
  border-radius: 40px; border: 1px solid rgba(63, 191, 110, 0.16);
  background:
    radial-gradient(700px 300px at 50% -60px, rgba(63, 191, 110, 0.12), transparent 70%),
    rgba(255, 255, 255, 0.03);
}
.privacy-shield { color: #3fbf6e; margin-bottom: 18px; filter: drop-shadow(0 0 24px rgba(63, 191, 110, 0.4)); }
.privacy .section-head { margin-bottom: 44px; }
.privacy-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; text-align: start; }
.p-card { padding: 26px 24px; }
.p-card h3 { margin: 0 0 10px; font-size: 1.06rem; color: #7fe0a3; }
.p-card p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* ---------- Pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; align-items: stretch; }
.price-card { position: relative; padding: 32px 28px; display: flex; flex-direction: column; transition: transform 0.25s var(--ease); }
.price-card:hover { transform: translateY(-4px); }
.price-card.featured {
  background:
    linear-gradient(var(--bg-2), var(--bg-2)) padding-box,
    linear-gradient(160deg, #ffb35c, #f7871f 45%, #8e52de) border-box;
  border: 1.5px solid transparent;
  box-shadow: 0 30px 70px -30px rgba(247, 135, 31, 0.45);
}
.price-card h3 { margin: 0 0 6px; font-size: 1.02rem; color: var(--muted); font-weight: 600; }
.price { margin: 0 0 20px; display: flex; align-items: baseline; gap: 7px; }
.price span { font-size: 2.5rem; font-weight: 800; letter-spacing: -0.02em; }
.price em { font-style: normal; color: var(--muted); font-size: 0.95rem; }
.price-card ul { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 11px; flex: 1; }
.price-card li { display: flex; gap: 10px; align-items: flex-start; font-size: 0.93rem; color: #d4d5dc; }
.price-card li::before {
  content: "✓"; color: var(--accent-2); font-weight: 700; flex-shrink: 0; margin-top: 1px;
}
.p-badge {
  position: absolute; top: -13px; inset-inline-start: 50%; transform: translateX(-50%);
  background: var(--accent-grad); color: #17181c; font-size: 0.76rem; font-weight: 700;
  padding: 5px 14px; border-radius: 999px; white-space: nowrap;
}
[dir="rtl"] .p-badge { transform: translateX(50%); }
.p-badge.gold { background: linear-gradient(135deg, #f3d98b, #d9a441); }
.p-note { margin: -10px 0 16px; font-size: 0.82rem; color: var(--muted); }
.region-note { text-align: center; color: var(--muted); font-size: 0.85rem; margin-top: 26px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 780px; margin: 0 auto; display: grid; gap: 12px; }
.faq-list details {
  background: var(--panel); border: 1px solid var(--line-soft); border-radius: var(--radius-md);
  padding: 0 22px; transition: border-color 0.2s, background 0.2s;
}
.faq-list details[open] { border-color: rgba(247, 135, 31, 0.35); background: var(--panel-strong); }
.faq-list summary {
  list-style: none; cursor: pointer; padding: 19px 0; font-weight: 600; font-size: 1.02rem;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary i {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0; position: relative;
  background: var(--panel-strong); transition: transform 0.25s var(--ease);
}
.faq-list summary i::before, .faq-list summary i::after {
  content: ""; position: absolute; background: var(--muted); border-radius: 2px;
  inset-inline-start: 50%; top: 50%;
}
.faq-list summary i::before { width: 10px; height: 1.6px; transform: translate(-50%, -50%); }
.faq-list summary i::after { width: 1.6px; height: 10px; transform: translate(-50%, -50%); transition: opacity 0.2s; }
.faq-list details[open] summary i { transform: rotate(90deg); }
.faq-list details[open] summary i::after { opacity: 0; }
.faq-list details p { margin: 0; padding: 0 0 20px; color: var(--muted); font-size: 0.95rem; }

/* ---------- Download ---------- */
.download { padding-bottom: 90px; }
.dl-card {
  max-width: 640px; margin: 0 auto; text-align: center; padding: 56px 36px 48px;
  background:
    radial-gradient(480px 240px at 50% -80px, rgba(247, 135, 31, 0.2), transparent 70%),
    var(--panel);
  border: 1px solid var(--line); border-radius: 36px;
}
.dl-icon { margin: 0 auto 20px; border-radius: 22px; box-shadow: 0 20px 50px -14px rgba(247, 135, 31, 0.5); }
.dl-card h2 { margin: 0 0 8px; font-size: 2rem; letter-spacing: -0.02em; }
.dl-card > p { margin: 0 0 28px; color: var(--muted); }
.dl-note { margin: 22px 0 0; font-size: 0.86rem; color: var(--muted); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line-soft); background: #08090c; padding: 56px 24px 32px; }
.footer-grid {
  max-width: 1180px; margin: 0 auto 36px; display: grid;
  grid-template-columns: 1.2fr 0.8fr 1.4fr; gap: 40px;
}
.f-brand p { color: var(--muted); font-size: 0.9rem; margin: 16px 0 0; max-width: 30em; }
.f-links { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.f-links a { color: var(--muted); font-size: 0.9rem; transition: color 0.2s; }
.f-links a:hover { color: var(--accent-2); }
.f-langs-label { margin: 0 0 12px; font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.07em; }
#langChips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 7px; }
#langChips button {
  padding: 5px 11px; border-radius: 999px; font-size: 0.8rem; color: var(--muted);
  border: 1px solid var(--line-soft); transition: all 0.15s;
}
#langChips button:hover { color: var(--text); border-color: var(--accent); }
#langChips button[aria-pressed="true"] { color: var(--accent-2); border-color: var(--accent); background: rgba(247, 135, 31, 0.1); }
.f-copy { text-align: center; color: var(--muted); font-size: 0.82rem; margin: 0; }

/* ---------- Reveal 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }
.reveal[data-delay="5"] { transition-delay: 0.5s; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 52px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-inline: auto; }
  .hero-ctas { justify-content: center; }
  .theme-stage { grid-template-columns: 1fr; }
  .features-grid, .steps-grid, .pricing-grid, .privacy-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-inner { gap: 12px; }
  .nav-cta { display: none; }
  .section { padding-top: 72px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid, .steps-grid, .pricing-grid, .privacy-grid { grid-template-columns: 1fr; }
  .privacy-inner { padding: 52px 22px 44px; border-radius: 28px; }
  .theme-lab { padding: 16px; }
  .hero { padding-top: calc(var(--nav-h) + 48px); }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .chat-body { min-height: 130px; }
  .keypad { grid-auto-rows: 40px; gap: 6px; }
}

/* ---------- 减弱动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orb, .badge-dot, .pulse-dot, .caret { animation: none !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .msg, .result-pill, .toast, .hist-panel { animation: none; }
  .phone { transition: none; }
  * { scroll-behavior: auto !important; }
}