/* ==========================================
   课程进度查询 — 霓虹玻璃态 · 交错网格
   ========================================== */

/* ----- Theme: Light (唯一主题) ----- */
:root {
  color-scheme: light;
  --bg-deep:      #f0f2f8;
  --bg-surface:   #ffffff;
  --glass-bg:     rgba(255, 255, 255, 0.75);
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-hover:  rgba(0, 0, 0, 0.03);

  --neon-blue:    #3d7fe0;
  --neon-purple:  #7c5cc8;
  --neon-magenta: #d04070;
  --neon-cyan:    #20a898;

  --text:         #1c2040;
  --text-soft:    #555b78;
  --text-muted:   #8b8fab;

  --accent:       #3d50c0;
  --accent-deep:  #3344b0;
  --green:        #1f9e50;
  --amber:        #b87018;
  --red:          #a82030;
  --red-deep:     #8c1a28;

  --shadow-glow:  0 0 30px rgba(80, 100, 200, 0.06), 0 0 60px rgba(120, 60, 200, 0.03);

  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 18px;
  --font:      'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg-deep);
  min-height: 100vh;
  overflow-x: hidden;
  /* 主题色瞬间切换，不用 transition 拖慢 */
}

button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input  { font: inherit; border: none; outline: none; background: none; color: inherit; }
a     { color: var(--accent); text-decoration: none; }

/* ==========================================
   Background — Noise + Neon Orbs
   ========================================== */

/* Noise overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* Neon orbs */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-orbs__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);          /* 140→80，GPU 负担降低 60% */
  opacity: 0.22;
  will-change: transform;      /* 3 个球持续动画，保留 GPU 层是合理的 */
}

.bg-orbs__orb--a {
  width: 620px; height: 620px;
  background: radial-gradient(circle, var(--neon-blue), transparent 70%);
  top: -10%; left: -8%;
  animation: orbA 24s ease-in-out infinite;
}

.bg-orbs__orb--b {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--neon-purple), transparent 70%);
  bottom: -15%; right: -10%;
  animation: orbB 28s ease-in-out infinite;
}

.bg-orbs__orb--c {
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--neon-magenta), transparent 70%);
  top: 45%; left: 50%;
  transform: translate(-50%, -50%);
  animation: orbC 20s ease-in-out infinite;
}

@keyframes orbA {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(60px, -40px) scale(1.12); }
  50%      { transform: translate(-30px, 50px) scale(0.88); }
  75%      { transform: translate(-50px, -20px) scale(1.06); }
}

@keyframes orbB {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(-50px, 60px) scale(1.1); }
  66%      { transform: translate(40px, -40px) scale(0.9); }
}

@keyframes orbC {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  25%      { transform: translate(-30%, -65%) scale(1.08); }
  50%      { transform: translate(-65%, -35%) scale(0.92); }
  75%      { transform: translate(-40%, -25%) scale(1.05); }
}

/* ==========================================
   App
   ========================================== */
.app {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

/* ==========================================
   Main Card — SaaS-style container
   ========================================== */
.app-card {
  background: var(--card-bg, var(--glass-bg));
  backdrop-filter: blur(16px);           /* 24→16，GPU 负担降低 */
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border, var(--glass-border));
  border-radius: 20px;
  padding: 36px 32px 32px;
  --card-bg: rgba(255, 255, 255, 0.82);
  --card-border: rgba(0, 0, 0, 0.06);
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.03),
    0 12px 40px rgba(0, 0, 0, 0.06),
    0 0 0 1px rgba(0, 0, 0, 0.02) inset;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  transform: translateZ(0);
}

/* ==========================================
   Header
   ========================================== */
.header {
  margin-bottom: 24px;
  text-align: center;
}

.header__title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.header__title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple) 50%, var(--neon-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header__subtitle {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--text-soft);
  line-height: 1.5;
}

/* Icon button */
.icon-btn {
  width: 38px; height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--text-soft);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.icon-btn:hover {
  color: var(--text);
  border-color: var(--glass-hover);
  background: rgba(255,255,255,0.08);
}

.icon-btn:active {
  transform: scale(0.9);
  transition: transform 0.08s ease;
}

/* ==========================================
   Banner — 三广告轮播
   ========================================== */

/* ---- Carousel wrapper ---- */
.banner-carousel {
  overflow: hidden;
  border-radius: 14px;
  margin-bottom: 8px;
  contain: layout style paint;   /* 隔离重绘，轮播内动画不影响外部 */
}

/* ---- Track：flex 横排，transform 驱动滑动 ---- */
.banner-track {
  display: flex;
  transition: transform 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ---- 每张卡片占满轮播宽度 ---- */
.banner-track .banner-card {
  flex: 0 0 100%;
  min-width: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* ---- 独立卡片（单条广告、无轮播） ---- */
#bannerContainer > .banner-card {
  margin-bottom: 22px;
}

/* ---- 卡片基础 ---- */
.banner-card {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(139, 92, 246, 0.18);
  box-shadow:
    0 0 20px rgba(139, 92, 246, 0.08),
    0 0 60px rgba(139, 92, 246, 0.03),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

/* ==========================================
   Banner — 三套配色主题
   ========================================== */

/* -- t0: 紫靛 -- */
.banner-card--t0 {
  background: linear-gradient(135deg, rgba(99,102,241,0.07), rgba(139,92,246,0.06), rgba(168,85,247,0.05));
  border-color: rgba(99, 102, 241, 0.12);
  box-shadow: 0 0 20px rgba(99,102,241,0.04), inset 0 1px 0 rgba(255,255,255,0.5);
}
.banner-card--t0:hover {
  border-color: rgba(99, 102, 241, 0.22);
  box-shadow: 0 0 30px rgba(99,102,241,0.08), inset 0 1px 0 rgba(255,255,255,0.6);
}
.banner-card--t0 .banner-card__tag {
  color: #4338ca;
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.22);
}
.banner-card--t0 .banner-card__btn {
  color: #fff;
  background: #4f46e5;
  border-color: #4f46e5;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}
.banner-card--t0 .banner-card__btn:hover {
  background: #4338ca;
  border-color: #4338ca;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}

/* -- t1: 青碧 / 科技感 -- */
.banner-card--t1 {
  background: linear-gradient(135deg, rgba(20,184,166,0.06), rgba(13,148,136,0.05), rgba(20,184,166,0.04));
  border-color: rgba(20, 184, 166, 0.12);
  box-shadow: 0 0 20px rgba(20,184,166,0.03), inset 0 1px 0 rgba(255,255,255,0.5);
}
.banner-card--t1:hover {
  border-color: rgba(20, 184, 166, 0.22);
  box-shadow: 0 0 30px rgba(20,184,166,0.07), inset 0 1px 0 rgba(255,255,255,0.6);
}
.banner-card--t1 .banner-card__tag {
  color: #0f766e;
  background: rgba(20, 184, 166, 0.1);
  border-color: rgba(20, 184, 166, 0.2);
}
.banner-card--t1 .banner-card__btn {
  color: #fff;
  background: #0d9488;
  border-color: #0d9488;
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.25);
}
.banner-card--t1 .banner-card__btn:hover {
  background: #0f766e;
  border-color: #0f766e;
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.35);
}

/* -- t2: 暖金 / 促销感 -- */
.banner-card--t2 {
  background: linear-gradient(135deg, rgba(245,158,11,0.06), rgba(234,179,8,0.05), rgba(245,158,11,0.04));
  border-color: rgba(245, 158, 11, 0.12);
  box-shadow: 0 0 20px rgba(245,158,11,0.03), inset 0 1px 0 rgba(255,255,255,0.5);
}
.banner-card--t2:hover {
  border-color: rgba(245, 158, 11, 0.22);
  box-shadow: 0 0 30px rgba(245,158,11,0.07), inset 0 1px 0 rgba(255,255,255,0.6);
}
.banner-card--t2 .banner-card__tag {
  color: #b45309;
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
}
.banner-card--t2 .banner-card__btn {
  color: #fff;
  background: #d97706;
  border-color: #d97706;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.25);
}
.banner-card--t2 .banner-card__btn:hover {
  background: #b45309;
  border-color: #b45309;
  box-shadow: 0 4px 16px rgba(217, 119, 6, 0.35);
}

/* ---- 通用子元素 ---- */
.banner-card__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: none;
  border: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.banner-card__body {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  pointer-events: none;
}

.banner-card__body > * { pointer-events: auto; }

.banner-card__text { flex: 1; min-width: 0; }

.banner-card__tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 20px;
  margin-bottom: 6px;
}

.banner-card__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #1e1b4b;
  line-height: 1.3;
  margin: 0 0 2px;
}

.banner-card__subtitle {
  font-size: 12.5px;
  color: #555b78;
  line-height: 1.45;
  margin: 0;
}

.banner-card__action { flex-shrink: 0; }

.banner-card__btn {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 18px;
  font-size: 13px;
  font-weight: 600;
  color: #ffffff;
  border-radius: 50px;
  text-decoration: none;
  white-space: nowrap;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

/* ==========================================
   Dots — 轮播指示器
   ========================================== */
.banner-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 22px;
}

.banner-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.12);
  cursor: pointer;
  padding: 0;
  transition: background 0.25s ease, transform 0.25s ease;
}

.banner-dot:hover {
  background: rgba(0, 0, 0, 0.25);
}

.banner-dot--active {
  background: rgba(0, 0, 0, 0.45);
  transform: scale(1.35);
}

/* ==========================================
   Banner — 移动端
   ========================================== */
@media (max-width: 700px) {
  .banner-card__body {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
  }

  .banner-card__title { font-size: 14px; }
  .banner-card__subtitle { font-size: 12px; }

  .banner-card__btn {
    height: 32px;
    padding: 0 16px;
    font-size: 12px;
  }

  .banner-dot { width: 5px; height: 5px; }
}

/* ==========================================
   Search
   ========================================== */
.search {
  margin-bottom: 28px;
}

.search__row {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 520px;
  margin: 0 auto;
}

.search__input-group {
  flex: 1;
  min-width: 0;
  position: relative;
  display: flex;
  align-items: center;
}

.search__icon {
  position: absolute;
  left: 14px;
  pointer-events: none;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color 0.25s;
}

.search__input-group:focus-within .search__icon {
  color: var(--neon-blue);
}

.search__input {
  flex: 1;
  min-width: 0;
  width: 100%;
  height: 46px;
  padding: 0 18px 0 40px;
  font-size: 15px;
  font-weight: 450;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 0.25s, box-shadow 0.25s;
}

.search__input::placeholder { color: var(--text-muted); }

.search__input:focus {
  border-color: rgba(100, 150, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(100, 140, 255, 0.08), 0 0 20px rgba(100, 140, 255, 0.06);
}

.search__btn {
  flex-shrink: 0;
  width: auto;
  height: 46px;
  padding: 0 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  border-radius: var(--radius);
  transition: box-shadow 0.15s ease, transform 0.1s ease;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.search__btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transform: translateX(-100%);
}

.search__btn:hover::after {
  animation: shimmer 0.7s ease;
}

.search__btn:hover  { box-shadow: 0 0 30px rgba(100, 140, 255, 0.25); }
.search__btn:active { transform: scale(0.985); }
.search__btn:disabled { opacity: 0.4; pointer-events: none; }

@keyframes shimmer {
  to { transform: translateX(100%); }
}

.search__hint {
  margin-top: 7px;
  font-size: 12px;
  color: var(--red);
  min-height: 16px;
  padding-left: 4px;
}

/* ==========================================
   States
   ========================================== */
.state { text-align: center; padding: 48px 16px 36px; }

.state--empty {
  padding: 52px 16px 56px;
}

.state__illustration { margin-bottom: 20px; }

.state__illustration-icon {
  display: inline-block;
  color: var(--text-muted);
  opacity: 0.22;
  user-select: none;
  /* 主题色立即切换 */
}

.state__heading {
  font-size: 15px;
  font-weight: 550;
  color: var(--text-soft);
  margin-bottom: 6px;
}

.state__text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.state__text--error { color: var(--red); margin-bottom: 16px; }

/* Skeleton */
.skeleton {
  height: 200px;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  margin-bottom: 16px;
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50%      { opacity: 0.6; }
}

/* ==========================================
   Cards — Glassmorphism + Neon Glow
   ========================================== */
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.course-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: border-color 0.2s ease, transform 0.25s ease, box-shadow 0.2s ease;
  animation: cardIn 0.5s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  overflow: hidden;
  contain: layout style;  /* hover 一个卡片不会触发其他卡片回流 */
}

/* Subtle inner glow */
.course-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity 0.35s;
}

/* Bottom glow on hover */
.course-card::after {
  content: '';
  position: absolute;
  bottom: -40px; left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 60px;
  background: radial-gradient(ellipse, rgba(100,140,255,0.12), transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s;
}

.course-card:hover {
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-2px);
  box-shadow:
    0 0 30px rgba(100, 140, 255, 0.08),
    0 0 60px rgba(150, 80, 240, 0.04),
    0 12px 32px rgba(0, 0, 0, 0.2);
}

.course-card:hover::before { opacity: 1; }
.course-card:hover::after  { opacity: 1; }

@keyframes cardIn {
  from { opacity: 0; transform: translateY(24px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Status ---- */
.course-card__top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.course-card__status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 10px;
  border-radius: 20px;
}

.course-card__status::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  flex-shrink: 0;
}

.course-card__status--completed {
  background: rgba(60, 201, 126, 0.1);
  color: var(--green);
  border: 1px solid rgba(60, 201, 126, 0.2);
}
.course-card__status--completed::before {
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

.course-card__status--pending {
  background: rgba(224, 168, 48, 0.1);
  color: var(--amber);
  border: 1px solid rgba(224, 168, 48, 0.2);
}
.course-card__status--pending::before {
  background: var(--amber);
  box-shadow: 0 0 6px var(--amber);
}

.course-card__status--in-progress {
  background: rgba(100, 150, 255, 0.1);
  color: var(--accent);
  border: 1px solid rgba(100, 150, 255, 0.2);
}
.course-card__status--in-progress::before {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

.course-card__status--default {
  background: rgba(255,255,255,0.04);
  color: var(--text-soft);
  border: 1px solid var(--glass-border);
}
.course-card__status--default::before { background: var(--text-muted); }

/* ---- Name ---- */
.course-card__name {
  font-size: 15px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 3px;
}

.course-card__platform {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ---- Progress ---- */
.course-card__progress { margin-bottom: 16px; }

.course-card__progress-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.course-card__progress-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  flex-shrink: 0;
}

.course-card__progress-track {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
  min-width: 0;
}

.course-card__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-blue), var(--neon-purple));
  border-radius: 3px;
  transition: width 0.8s cubic-bezier(0.22, 0.61, 0.36, 1);
  box-shadow: 0 0 8px rgba(100, 180, 255, 0.4);
}

.course-card__progress-pct {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---- Info ---- */
.course-card__info {
  font-size: 12px;
  line-height: 1.75;
  color: var(--text-soft);
  margin-bottom: 4px;
}

.course-card__info strong {
  font-weight: 500;
  color: var(--text-muted);
}

.course-card__info-sep {
  display: inline-block;
  width: 1px;
  height: 10px;
  background: var(--glass-border);
  margin: 0 8px;
  vertical-align: middle;
}

/* ---- Remarks ---- */
.course-card__remarks {
  font-size: 12px;
  line-height: 1.85;
  color: var(--text-soft);
  background: rgba(255,255,255,0.025);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-top: 8px;
  margin-bottom: 16px;
  word-break: break-all;
}

.course-card__remarks strong {
  font-weight: 600;
  color: var(--text);
}

/* ---- Actions ---- */
.course-card__actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 34px;
  padding: 0 12px;
  font-size: 12.5px;
  font-weight: 550;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn--outline {
  color: var(--accent-deep);
  font-weight: 600;
  background: rgba(100, 140, 255, 0.1);
  border: 1px solid rgba(100, 140, 255, 0.18);
}

.btn--outline:hover {
  background: rgba(100, 140, 255, 0.18);
  border-color: rgba(100, 140, 255, 0.35);
  box-shadow: 0 0 16px rgba(100, 140, 255, 0.15);
}

.btn--danger {
  color: var(--red-deep);
  font-weight: 600;
  background: rgba(224, 85, 101, 0.08);
  border: 1px solid rgba(224, 85, 101, 0.15);
}

.btn--danger:hover {
  background: rgba(224, 85, 101, 0.16);
  border-color: rgba(224, 85, 101, 0.3);
  box-shadow: 0 0 16px rgba(224, 85, 101, 0.12);
}

.btn:disabled { opacity: 0.35; pointer-events: none; }

.btn__spinner {
  display: none;
  width: 15px; height: 15px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn--loading .btn__spinner { display: block; }
.btn--loading .btn__content { display: none; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ==========================================
   Toast
   ========================================== */
.toast-container {
  position: fixed;
  top: 20px; right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
  pointer-events: auto;
  min-width: 300px; max-width: 420px;
  animation: toastIn 0.3s ease both;
}

.toast--success { border-left: 3px solid var(--green); }
.toast--error   { border-left: 3px solid var(--red); }

.toast--removing { animation: toastOut 0.25s ease forwards; }

.toast__icon { width: 20px; height: 20px; flex-shrink: 0; }
.toast--success .toast__icon { color: var(--green); }
.toast--error   .toast__icon { color: var(--red); }

.toast__msg  { flex: 1; font-size: 13px; line-height: 1.4; }

.toast__close {
  flex-shrink: 0;
  width: 24px; height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-radius: 4px;
  transition: background 0.15s ease, color 0.15s ease;
}

.toast__close:hover { background: rgba(255,255,255,0.06); color: var(--text); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(50px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(50px); }
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 700px) {
  .app { padding: 16px 10px 40px; }

  .app-card {
    padding: 24px 16px 20px;
    border-radius: 16px;
  }

  .header__title { font-size: 20px; }

  .cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .search__btn { padding: 0 20px; font-size: 13px; }

  .course-card { padding: 18px 16px; }
  .course-card__name { font-size: 14px; }
  .course-card__progress-pct { font-size: 18px; }

  .course-card__actions {
    grid-template-columns: 1fr 1fr;
  }

  .btn { height: 32px; font-size: 12px; padding: 0 10px; }

  .toast-container { left: 10px; right: 10px; }
  .toast { min-width: unset; max-width: unset; }
}

/* ==========================================
   Accessibility
   ========================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--neon-blue);
  outline-offset: 2px;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.06); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.12); }

/* ==========================================
   Log Button — 查看日志
   ========================================== */
.btn--log {
  color: var(--neon-cyan);
  font-weight: 600;
  background: rgba(58, 216, 194, 0.08);
  border: 1px solid rgba(58, 216, 194, 0.18);
}

.btn--log:hover {
  background: rgba(58, 216, 194, 0.16);
  border-color: rgba(58, 216, 194, 0.35);
  box-shadow: 0 0 16px rgba(58, 216, 194, 0.12);
}

/* 三列操作区 */
.course-card__actions--three {
  grid-template-columns: 1fr 1fr 1fr;
}

@media (max-width: 700px) {
  .course-card__actions--three {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .course-card__actions--three .btn {
    padding: 0 6px;
    font-size: 11px;
  }
}

/* ==========================================
   Log Modal — 日志弹窗
   ========================================== */
.log-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9990;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 20px;
}

.log-modal {
  width: 100%;
  max-width: 680px;
  max-height: 85vh;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.12),
    0 0 0 1px rgba(0, 0, 0, 0.04) inset;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalIn 0.25s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* -- Header -- */
.log-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.log-modal__title {
  font-size: 15px;
  font-weight: 650;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.log-modal__header-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.log-modal__refresh-hint {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  min-width: 48px;
  text-align: right;
}

.log-modal__header-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: transparent;
  color: var(--text-soft);
  font-size: 14px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.log-modal__header-btn:hover {
  color: var(--text);
  background: var(--glass-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

/* -- Body -- */
.log-modal__body {
  flex: 1;
  overflow-y: auto;
  padding: 10px 0;
  min-height: 120px;
  max-height: 55vh;
}

/* -- Footer -- */
.log-modal__footer {
  padding: 10px 22px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--glass-border);
  flex-shrink: 0;
}

/* -- Loading -- */
.log-modal__loading {
  text-align: center;
  padding: 40px 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* -- Empty -- */
.log-modal__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 16px;
  color: var(--text-muted);
  gap: 10px;
}

.log-modal__empty p {
  font-size: 13px;
  margin: 0;
}

/* -- Log Entry -- */
.log-entry {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 7px 22px;
  font-size: 12.5px;
  line-height: 1.5;
  transition: background 0.12s;
}

.log-entry:hover {
  background: rgba(255, 255, 255, 0.025);
}

.log-entry__time {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 11.5px;
  color: var(--text-muted);
  flex-shrink: 0;
  padding-top: 1px;
  min-width: 56px;
}

.log-entry__level {
  display: inline-block;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.03em;
  padding: 1px 7px;
  border-radius: 10px;
  flex-shrink: 0;
  margin-top: 1px;
  min-width: 40px;
  text-align: center;
}

.log-entry__level--info  { background: rgba(77, 159, 255, 0.15); color: var(--neon-blue); }
.log-entry__level--warn  { background: rgba(224, 168, 48, 0.15); color: var(--amber); }
.log-entry__level--error { background: rgba(224, 85, 101, 0.15); color: var(--red); }
.log-entry__level--debug { background: rgba(110, 115, 144, 0.15); color: var(--text-muted); }

.log-entry__msg {
  flex: 1;
  min-width: 0;
  word-break: break-all;
  color: var(--text-soft);
}

/* -- Mobile -- */
@media (max-width: 700px) {
  .log-modal-overlay {
    padding: 0;
    align-items: flex-end;
  }

  .log-modal {
    max-width: 100%;
    max-height: 90vh;
    border-radius: 16px 16px 0 0;
    animation: modalInMobile 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
  }

  @keyframes modalInMobile {
    from { transform: translateY(100%); }
    to   { transform: translateY(0); }
  }

  .log-modal__header { padding: 14px 16px; }
  .log-modal__body   { max-height: 50vh; }
  .log-modal__footer { padding: 8px 16px; }
  .log-entry         { padding: 6px 16px; }
  .log-entry__time   { min-width: 48px; font-size: 11px; }
  .log-entry__level  { min-width: 34px; font-size: 9.5px; }
  .log-entry__msg    { font-size: 12px; }
}