/* ============================================================
 * Day 1-7 翻页幻灯片 · 共享样式
 * 深空科技风 + 玻璃质感 + 霓虹光效
 * ============================================================ */
:root {
  --bg-1:#050816; --bg-2:#0d1130; --bg-3:#181c40;
  --neon-cyan:#00F5FF; --neon-blue:#4FACFE; --neon-purple:#A06CD5;
  --neon-pink:#FF6EC7; --neon-gold:#FFD700; --neon-green:#4CFFA1;
  --text:#E8ECFF; --text-dim:#8B92B8;
  --glass:rgba(255,255,255,0.05); --glass-border:rgba(255,255,255,0.1);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg-1);
  color: var(--text);
  font-family: -apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  height: 100vh;
  overflow: hidden;
  line-height: 1.7;
}
::selection { background: rgba(0,245,255,0.4); color: #fff; }

/* ===== 背景 ===== */
.bg-stage {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(ellipse 1000px 700px at 15% 20%, rgba(160,108,213,0.22) 0%, transparent 60%),
    radial-gradient(ellipse 1200px 800px at 85% 30%, rgba(0,245,255,0.18) 0%, transparent 60%),
    radial-gradient(ellipse 900px 700px at 50% 90%, rgba(255,110,199,0.14) 0%, transparent 60%),
    linear-gradient(135deg, #050816 0%, #0a0e2c 50%, #1a1f4d 100%);
}
.bg-grid {
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(0,245,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,245,255,0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 1200px 800px at 50% 50%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 1200px 800px at 50% 50%, black 30%, transparent 80%);
}

/* ===== 顶部进度 ===== */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(13,17,48,0.7);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  height: 60px;
}
.topbar a { color: var(--text-dim); text-decoration: none; font-size: 13px; }
.topbar a:hover { color: var(--neon-cyan); }
.topbar .day-label {
  font-size: 12px; letter-spacing: 2px; color: var(--neon-cyan);
  background: rgba(0,245,255,0.08);
  padding: 4px 12px; border-radius: 999px;
  border: 1px solid rgba(0,245,255,0.2);
  white-space: nowrap;
}
.dots { display: flex; gap: 8px; flex-wrap: wrap; }
.dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.15);
  transition: all 0.3s; cursor: pointer;
}
.dot.done { background: var(--neon-cyan); box-shadow: 0 0 10px var(--neon-cyan); }
.dot.active {
  background: linear-gradient(135deg,var(--neon-cyan),var(--neon-purple));
  width: 28px; border-radius: 5px;
  box-shadow: 0 0 12px var(--neon-cyan);
}

/* ===== 幻灯片舞台 ===== */
.stage {
  position: fixed;
  top: 60px;       /* 顶部留出 topbar 高度 */
  left: 0; right: 0; bottom: 70px;  /* 底部留出 nav-bottom */
  overflow: hidden;
}
.slides { position: relative; width: 100%; height: 100%; }
.slide {
  position: absolute; inset: 0;
  display: flex;
  align-items: safe center;            /* 关键：内容超长时不会被切顶 */
  justify-content: center;
  padding: 30px 30px 40px;
  opacity: 0; visibility: hidden;
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(.2,.8,.2,1);
  transform: translateX(60px);
  overflow-y: auto;
  overflow-x: hidden;
}
.slide.active { opacity: 1; visibility: visible; transform: translateX(0); }
.slide.prev { transform: translateX(-60px); }
.slide-inner {
  width: 100%; max-width: 1100px;
  display: flex; flex-direction: column; align-items: center; gap: 22px;
  margin: auto 0;       /* 短内容垂直居中，长内容自然撑开 */
}

/* ===== 通用排版 ===== */
h1.big {
  font-size: clamp(36px, 7vw, 78px);
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.1;
  text-align: center;
  background: linear-gradient(120deg,#00F5FF,#4FACFE,#A06CD5,#FF6EC7,#FFD700);
  background-size: 300% 300%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 30px rgba(0,245,255,0.3));
  animation: gradientFlow 8s ease infinite;
  padding: 0.1em 0;
}
@keyframes gradientFlow { 0%,100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }

h2.title {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  background: linear-gradient(120deg, #00F5FF, #A06CD5);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-align: center;
  margin-bottom: 4px;
  padding: 0.05em 0;
  line-height: 1.2;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--neon-cyan);
  text-transform: uppercase;
}

.lead {
  font-size: 17px;
  color: var(--text-dim);
  text-align: center;
  max-width: 760px;
}

.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 22px;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  width: 100%;
  max-width: 880px;
}

code {
  background: rgba(0,245,255,0.1);
  color: var(--neon-cyan);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: "Fira Code", Consolas, monospace;
  font-size: 0.9em;
}

pre {
  background: rgba(13,17,48,0.85);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 16px;
  border-radius: 10px;
  font-family: "Fira Code", Consolas, monospace;
  font-size: 13px;
  overflow-x: auto;
  line-height: 1.7;
  text-align: left;
  width: 100%;
}
pre code { background: none; color: inherit; padding: 0; }
pre .kw { color: var(--neon-pink); }
pre .str { color: var(--neon-green); }
pre .com { color: var(--text-dim); }
pre .fn { color: var(--neon-gold); }
pre .num { color: var(--neon-blue); }

/* ===== 底部导航 ===== */
.nav-bottom {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 40;
  background: rgba(13,17,48,0.7);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.btn {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s;
}
.btn:hover:not(:disabled) {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  transform: translateY(-1px);
}
.btn:disabled { opacity: 0.35; cursor: not-allowed; }
.btn.primary {
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
  color: var(--bg-1);
  border: none;
  font-weight: 700;
}
.btn.primary:hover:not(:disabled) { box-shadow: 0 8px 24px rgba(0,245,255,0.4); }
.btn.success {
  background: linear-gradient(135deg, var(--neon-green), #26C6DA);
  color: var(--bg-1);
  border: none;
  font-weight: 700;
}
.page-counter {
  color: var(--text-dim);
  font-size: 13px;
  font-family: "Fira Code", monospace;
}

/* ===== 提示卡 ===== */
.tip-box {
  background: linear-gradient(135deg, rgba(0,245,255,0.06), rgba(160,108,213,0.04));
  border: 1px solid rgba(0,245,255,0.25);
  border-radius: 14px;
  padding: 16px 22px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  max-width: 800px;
  width: 100%;
}
.tip-box .ti { font-size: 24px; flex-shrink: 0; }
.tip-box.warn {
  background: linear-gradient(135deg, rgba(255,110,199,0.06), rgba(255,215,0,0.04));
  border-color: rgba(255,110,199,0.25);
}
.tip-box.success {
  background: linear-gradient(135deg, rgba(76,255,161,0.06), rgba(0,245,255,0.04));
  border-color: rgba(76,255,161,0.3);
}

/* ===== 封面页 ===== */
.cover-pre {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 18px;
  background: rgba(0,245,255,0.08);
  border: 1px solid rgba(0,245,255,0.3);
  border-radius: 999px;
  font-size: 13px; color: var(--neon-cyan); letter-spacing: 2px;
  backdrop-filter: blur(10px);
}
.cover-pre::before {
  content: '';
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--neon-cyan);
  box-shadow: 0 0 10px var(--neon-cyan);
  animation: pulse 1.5s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.cover-stats {
  display: flex; gap: 40px; margin-top: 10px;
  flex-wrap: wrap; justify-content: center;
}
.cover-stats .item .n {
  font-size: 36px; font-weight: 800;
  background: linear-gradient(120deg, var(--neon-cyan), var(--neon-purple));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1;
}
.cover-stats .item .l {
  font-size: 11px; color: var(--text-dim);
  letter-spacing: 2px; text-transform: uppercase; margin-top: 6px;
}

/* ===== 通用卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  width: 100%;
  max-width: 980px;
}
.card-box {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 22px;
  backdrop-filter: blur(10px);
  transition: all 0.3s;
}
.card-box:hover {
  transform: translateY(-4px);
  border-color: rgba(0,245,255,0.4);
  box-shadow: 0 16px 40px rgba(0,0,0,0.3), 0 0 24px rgba(0,245,255,0.12);
}
.card-box .ico {
  font-size: 36px;
  margin-bottom: 8px;
  filter: drop-shadow(0 0 14px rgba(0,245,255,0.4));
}
.card-box h3 {
  margin-bottom: 6px;
  color: var(--neon-cyan);
}
.card-box.cyan h3 { color: var(--neon-cyan); }
.card-box.green h3 { color: var(--neon-green); }
.card-box.gold h3 { color: var(--neon-gold); }
.card-box.pink h3 { color: var(--neon-pink); }
.card-box.purple h3 { color: var(--neon-purple); }
.card-box p { color: var(--text-dim); font-size: 14px; }

/* ===== 对比双栏 ===== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  width: 100%;
  max-width: 920px;
}
@media (max-width: 720px) { .compare-grid { grid-template-columns: 1fr; } }
.prompt-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 18px;
  backdrop-filter: blur(10px);
}
.prompt-card.bad { border-left: 3px solid var(--neon-pink); }
.prompt-card.good { border-left: 3px solid var(--neon-green); }
.prompt-card h4 { margin-bottom: 8px; font-size: 14px; }
.prompt-card.bad h4 { color: var(--neon-pink); }
.prompt-card.good h4 { color: var(--neon-green); }
.prompt-card p { font-size: 13px; line-height: 1.7; color: var(--text); }

/* ===== 流程节点 ===== */
.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  width: 100%;
}
.flow-node {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px 24px;
  text-align: center;
  min-width: 140px;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}
.flow-node::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(0,245,255,0.12), transparent 60%);
  pointer-events: none;
}
.flow-node .ico {
  font-size: 40px; margin-bottom: 8px; display: block;
  filter: drop-shadow(0 0 12px rgba(0,245,255,0.5));
}
.flow-node h4 { color: var(--neon-cyan); }
.flow-node small { color: var(--text-dim); font-size: 12px; }
.flow-arrow {
  font-size: 28px;
  color: var(--neon-purple);
  animation: arrowMove 1.5s infinite;
}
@keyframes arrowMove {
  0%,100% { transform: translateX(0); opacity: 0.5; }
  50% { transform: translateX(8px); opacity: 1; }
}

/* ===== 小测 ===== */
.quiz-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 22px;
  backdrop-filter: blur(10px);
  width: 100%;
  max-width: 720px;
}
.quiz-card .q { font-weight: 700; margin-bottom: 12px; font-size: 15px; }
.quiz-card .opts label {
  display: block;
  padding: 10px 14px;
  margin: 6px 0;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}
.quiz-card .opts label:hover {
  background: rgba(0,245,255,0.05);
  border-color: rgba(0,245,255,0.3);
}
.quiz-card .opts input { margin-right: 10px; }
.quiz-card .opts label.right {
  background: rgba(76,255,161,0.1);
  border-color: var(--neon-green);
  color: var(--neon-green);
}
.quiz-card .opts label.wrong {
  background: rgba(255,110,199,0.1);
  border-color: var(--neon-pink);
  color: var(--neon-pink);
}
.quiz-feedback {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 13px;
  display: none;
}
.quiz-feedback.show { display: block; animation: fadein 0.3s; }
.quiz-feedback.ok {
  background: rgba(76,255,161,0.1);
  color: var(--neon-green);
  border: 1px solid rgba(76,255,161,0.3);
}
.quiz-feedback.no {
  background: rgba(255,110,199,0.1);
  color: var(--neon-pink);
  border: 1px solid rgba(255,110,199,0.3);
}
@keyframes fadein { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.quiz-progress {
  display: flex; justify-content: center; gap: 6px; margin-bottom: 14px;
}
.quiz-progress .qd {
  width: 24px; height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.1);
}
.quiz-progress .qd.ok { background: var(--neon-green); box-shadow: 0 0 8px var(--neon-green); }
.quiz-progress .qd.no { background: var(--neon-pink); }

/* ===== 完成页 ===== */
.finish-stage {
  text-align: center;
  padding: 30px;
  width: 100%;
  max-width: 600px;
}
.finish-stage .badge {
  width: 120px; height: 120px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: conic-gradient(from 180deg, var(--neon-cyan), var(--neon-purple), var(--neon-pink), var(--neon-gold), var(--neon-cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 60px;
  position: relative;
  animation: spinSlow 6s linear infinite;
  box-shadow: 0 0 40px rgba(0,245,255,0.4);
}
.finish-stage .badge::before {
  content: '';
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: var(--bg-2);
}
.finish-stage .badge span { position: relative; z-index: 1; }
@keyframes spinSlow { to { transform: rotate(360deg); } }

.finish-stage h2 {
  font-size: 32px; font-weight: 800; margin: 14px 0;
  background: linear-gradient(120deg, var(--neon-cyan), var(--neon-gold));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.finish-stage p { color: var(--text-dim); margin-bottom: 20px; }
.finish-actions {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
}

/* ===== 浮动小键提示 ===== */
.kbd-hint {
  position: fixed; bottom: 78px; right: 24px; z-index: 30;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 11px;
  color: var(--text-dim);
  backdrop-filter: blur(10px);
}
.kbd-hint kbd {
  background: rgba(255,255,255,0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Fira Code", monospace;
  font-size: 10px;
  color: var(--neon-cyan);
  border: 1px solid rgba(255,255,255,0.15);
}

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  .topbar { padding: 10px 14px; height: 56px; }
  .topbar .day-label { display: none; }
  .stage { top: 56px; bottom: 64px; }
  .nav-bottom { height: 64px; padding: 10px 14px; }
  .slide { padding: 18px 16px 24px; }
  .kbd-hint { display: none; }
}