/* =====================================================================
   WorldSim · 设计系统 / Base
   深空科幻主题 · 玻璃拟态 · 霓虹辉光
===================================================================== */

:root {
  /* —— 色彩 —— */
  --bg-0: #05060f;
  --bg-1: #0a0d22;
  --bg-2: #11152f;
  --bg-3: #1a2046;
  --surface: rgba(20, 26, 58, 0.55);
  --surface-strong: rgba(26, 33, 74, 0.85);
  --surface-hover: rgba(34, 44, 96, 0.7);

  --border: rgba(120, 140, 220, 0.18);
  --border-strong: rgba(140, 170, 255, 0.4);

  --text-0: #f3f6ff;
  --text-1: #c5cce6;
  --text-2: #8a93b8;
  --text-3: #5a608a;

  /* 主霓虹色：青蓝 */
  --c-primary: #38e1ff;
  --c-primary-2: #1aa7d6;
  --c-primary-glow: rgba(56, 225, 255, 0.55);

  /* 强调色：品红/紫 */
  --c-accent: #ff5dc8;
  --c-accent-2: #b14bff;
  --c-accent-glow: rgba(255, 93, 200, 0.55);

  /* 辅助 */
  --c-gold: #ffce5d;
  --c-mint: #58f5b0;
  --c-coral: #ff7e6b;

  /* 渐变 */
  --grad-hero: linear-gradient(135deg, #1a0b3d 0%, #0a1244 45%, #04132e 100%);
  --grad-primary: linear-gradient(120deg, var(--c-primary) 0%, var(--c-accent-2) 100%);
  --grad-accent: linear-gradient(120deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  --grad-text: linear-gradient(110deg, #ffffff 0%, var(--c-primary) 50%, var(--c-accent) 100%);

  /* —— 尺寸 —— */
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --maxw: 1240px;

  /* —— 阴影 / 辉光 —— */
  --shadow-card: 0 18px 50px -20px rgba(0, 0, 0, 0.6);
  --shadow-pop: 0 24px 70px -20px rgba(0, 0, 0, 0.8);
  --glow-primary: 0 0 24px var(--c-primary-glow);
  --glow-accent: 0 0 24px var(--c-accent-glow);

  /* —— 字体 —— */
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  --font-display: "Orbitron", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* —— 背景光晕（主题可覆盖）—— */
  --glow-a: rgba(90, 40, 200, 0.28);
  --glow-b: rgba(255, 70, 180, 0.18);
  --glow-c: rgba(0, 180, 255, 0.18);
  --grid-color: rgba(120, 160, 255, 0.04);
  --grid-size: 64px;
  --grid-mask: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);

  /* —— 主题元信息 —— */
  --is-light: 0; /* 1 = 浅色主题，触发反色适配 */

  /* —— 粒子色调（JS 读取）—— */
  --particle-colors: "56,225,255 | 255,93,200 | 180,200,255";
}

/* —— 重置 —— */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 全局深空背景层（粒子在 JS 中绘制） */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 700px at 12% -10%, var(--glow-a), transparent 60%),
    radial-gradient(800px 700px at 95% 8%, var(--glow-b), transparent 60%),
    radial-gradient(1100px 900px at 50% 110%, var(--glow-c), transparent 60%),
    var(--bg-0);
  pointer-events: none;
}

/* 网格纹理叠层 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  mask-image: var(--grid-mask);
  -webkit-mask-image: var(--grid-mask);
}

img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; color: inherit; outline: none; }
button { cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: var(--c-primary); color: #04122a; }

/* —— 滚动条 —— */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--c-primary-2), var(--c-accent-2));
  border-radius: 99px;
  border: 2px solid var(--bg-0);
}
::-webkit-scrollbar-thumb:hover { background: var(--c-primary); }

/* =====================================================================
   通用排版
===================================================================== */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.gradient-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% 200%;
  animation: shine 8s ease infinite;
}

.mono { font-family: var(--font-mono); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-primary);
  padding: 6px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  background: rgba(56, 225, 255, 0.06);
}

.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--c-primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--c-primary);
  animation: pulse 2s infinite;
}

.section { padding: var(--space-9) 0; position: relative; }
.section-head { max-width: 720px; margin-bottom: var(--space-7); }
.section-head.center { margin-inline: auto; text-align: center; }

.section-head h2 {
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.15;
  font-weight: 800;
  color: var(--text-0);
  margin-top: var(--space-4);
  letter-spacing: -0.02em;
}

.section-head p {
  margin-top: var(--space-4);
  font-size: 17px;
  color: var(--text-2);
}

/* =====================================================================
   按钮
===================================================================== */
.btn {
  --btn-bg: var(--surface-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 15px;
  color: var(--text-0);
  background: var(--btn-bg);
  border: 1px solid var(--border);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.btn:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--grad-primary);
  color: #03121e;
  font-weight: 700;
  border: none;
  box-shadow: 0 8px 30px -8px var(--c-primary-glow);
}
.btn-primary:hover { box-shadow: 0 12px 40px -6px var(--c-primary-glow); }

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(255,255,255,0.5) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform 0.6s;
  z-index: -1;
}
.btn-primary:hover::after { transform: translateX(120%); }

.btn-accent {
  background: var(--grad-accent);
  color: #fff;
  font-weight: 700;
  border: none;
  box-shadow: 0 8px 30px -8px var(--c-accent-glow);
}

.btn-ghost { background: transparent; border: 1px solid var(--border-strong); color: var(--text-0); }
.btn-ghost:hover { background: var(--surface); }

.btn-lg { padding: 17px 34px; font-size: 16px; }
.btn-sm { padding: 9px 16px; font-size: 13px; }
.btn-block { width: 100%; }

.btn[disabled] { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* =====================================================================
   玻璃卡片
===================================================================== */
.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--shadow-card);
  position: relative;
}

.card {
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, transparent, transparent, transparent, transparent);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  background: var(--surface-hover);
  box-shadow: var(--shadow-pop), 0 0 0 1px var(--border-strong);
}

/* 辉光角标 */
.card-glow::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -30%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle, var(--c-primary-glow), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
  filter: blur(20px);
}
.card-glow:hover::after { opacity: 0.5; }

/* =====================================================================
   表单
===================================================================== */
.field { margin-bottom: var(--space-5); }

.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrap .icon {
  position: absolute;
  left: 16px;
  color: var(--text-3);
  pointer-events: none;
  display: flex;
}

.input {
  width: 100%;
  padding: 15px 18px;
  background: rgba(8, 12, 30, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-0);
  font-size: 15px;
  transition: all 0.2s;
}
.input::placeholder { color: var(--text-3); }
.input:focus {
  border-color: var(--c-primary);
  background: rgba(8, 12, 30, 0.85);
  box-shadow: 0 0 0 4px rgba(56, 225, 255, 0.12);
}
.input-wrap .icon + .input,
.input-wrap .input.has-icon { padding-left: 46px; }

textarea.input { resize: vertical; min-height: 110px; line-height: 1.6; }
select.input { appearance: none; cursor: pointer; }

/* =====================================================================
   徽章 / 标签
===================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: rgba(56, 225, 255, 0.1);
  border: 1px solid rgba(56, 225, 255, 0.3);
  color: var(--c-primary);
}

.badge.accent { background: rgba(255, 93, 200, 0.1); border-color: rgba(255, 93, 200, 0.3); color: var(--c-accent); }
.badge.gold { background: rgba(255, 206, 93, 0.1); border-color: rgba(255, 206, 93, 0.35); color: var(--c-gold); }
.badge.mint { background: rgba(88, 245, 176, 0.1); border-color: rgba(88, 245, 176, 0.3); color: var(--c-mint); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-2);
}

/* =====================================================================
   动画关键帧
===================================================================== */
@keyframes shine {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px var(--c-primary-glow); }
  50% { box-shadow: 0 0 40px var(--c-primary-glow); }
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
@keyframes orbit {
  from { transform: rotate(0deg) translateX(var(--orbit-r)) rotate(0deg); }
  to { transform: rotate(360deg) translateX(var(--orbit-r)) rotate(-360deg); }
}
@keyframes blink {
  50% { opacity: 0; }
}

/* 进入视口动画 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s, transform 0.8s; }
.reveal.in { opacity: 1; transform: none; }

/* 工具类 */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.text-center { text-align: center; }
.muted { color: var(--text-2); }
.tiny { font-size: 13px; }

/* —— 页脚 —— */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0 var(--space-6);
  margin-top: var(--space-9);
  background: linear-gradient(180deg, transparent, rgba(10, 14, 40, 0.6));
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
.footer h4 { color: var(--text-0); font-size: 14px; margin-bottom: var(--space-4); letter-spacing: 0.04em; }
.footer a { display: block; color: var(--text-2); padding: 6px 0; font-size: 14px; transition: color 0.2s; }
.footer a:hover { color: var(--c-primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-3);
}

@media (max-width: 820px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}

/* —— Toast —— */
#toast-host {
  position: fixed;
  top: 90px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: var(--radius);
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-pop);
  color: var(--text-0);
  font-size: 14px;
  font-weight: 500;
  min-width: 240px;
  max-width: 360px;
  animation: scaleIn 0.3s;
}
.toast.success { border-left: 3px solid var(--c-mint); }
.toast.error { border-left: 3px solid var(--c-coral); }
.toast.info { border-left: 3px solid var(--c-primary); }
.toast .ico { flex-shrink: 0; }
.toast.leaving { animation: toastOut 0.3s forwards; }
@keyframes toastOut { to { opacity: 0; transform: translateX(40px); } }