/* ============================================================================
 * EduToolbox · pages.css
 * 职责：首页 Hero（渐变标题/标语/独立大搜索框/学科快速入口/分类标签云/统计）
 * 依赖：base.css, layout.css, components.css
 * ========================================================================== */

/* ---------------------------------------------------------------------------
 * 1. Hero 区
 * ------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: 72px 0 56px;
  overflow: hidden;
  background:
    radial-gradient(1100px 480px at 12% -10%, rgba(33, 150, 243, 0.10), transparent 60%),
    radial-gradient(900px 420px at 95% 0%, rgba(50, 165, 131, 0.10), transparent 55%),
    linear-gradient(to bottom, #EEF5FF 0%, #F5F9FF 50%, #ffffff 100%);
}

.hero .container {
  position: relative;
  text-align: center;
}

.hero-title {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.hero-title-grad {
  font-size: clamp(40px, 6.4vw, 64px);
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #2196F3 0%, #32A583 50%, #2196F3 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-title-sub {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  color: var(--text-2);
}

.hero-tagline {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
  color: var(--text-3);
  margin-bottom: 14px;
}

.hero-tag {
  padding: 4px 14px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: var(--r-pill);
}

.hero-desc {
  max-width: 720px;
  margin: 0 auto 30px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.85;
  background: linear-gradient(to right, #2563eb, #14b8a6);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------------------------------------------------------------------------
 * 2. Hero 独立大搜索框
 * ------------------------------------------------------------------------- */
.hero-search {
  position: relative;
  display: flex;
  align-items: center;
  max-width: 680px;
  margin: 0 auto 26px;
  padding: 6px 6px 6px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow);
  transition: all var(--t) var(--ease);
}

.hero-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(59, 110, 246, 0.12), var(--shadow);
}

.hero-search-icon {
  font-size: 17px;
  color: var(--text-3);
  margin-right: 8px;
}

.hero-search input {
  flex: 1;
  min-width: 0;
  height: 44px;
  font-size: 15px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-1);
}

.hero-search input::placeholder { color: var(--text-3); }

.hero-search-clear {
  width: 30px;
  height: 30px;
  margin-right: 6px;
  font-size: 13px;
  color: var(--text-3);
  border-radius: 50%;
  transition: all var(--t-fast) var(--ease);
}

.hero-search-clear:hover {
  color: var(--danger);
  background: var(--bg-soft);
}

.hero-search-btn {
  height: 44px;
  padding: 0 30px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--primary-grad);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-primary);
  transition: all var(--t-fast) var(--ease);
  white-space: nowrap;
}

.hero-search-btn:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
  box-shadow: 0 12px 26px rgba(59, 110, 246, 0.38);
}

/* ---------------------------------------------------------------------------
 * 3. 学科快速入口（彩色圆角按钮）
 * ------------------------------------------------------------------------- */
.subject-entry {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 30px;
}

.subject-btn {
  padding: 10px 22px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-2);
  background: var(--card-bg);
  border: 1.5px solid var(--border);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-sm);
  transition: all var(--t-fast) var(--ease);
}

.subject-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

/* 每个学科一套配色（hover 时激活） */
.subject-btn.cat-math:hover      { color: #2f6df6; border-color: #adc4ff; background: #edf2ff; }
.subject-btn.cat-chinese:hover   { color: #e84545; border-color: #ffc4c4; background: #fff1f1; }
.subject-btn.cat-english:hover   { color: #12a05c; border-color: #a7e6c8; background: #ecfbf3; }
.subject-btn.cat-physics:hover   { color: #6d4df2; border-color: #cfc2ff; background: #f2efff; }
.subject-btn.cat-chemistry:hover { color: #0ea5a0; border-color: #a6e7e4; background: #ecfdfc; }
.subject-btn.cat-geo:hover       { color: #e08b00; border-color: #ffe1a8; background: #fff8eb; }
.subject-btn.cat-history:hover   { color: #b06a2c; border-color: #ecd2b3; background: #fdf6ee; }

/* ---------------------------------------------------------------------------
 * 4. 分类标签云（三行无缝滚动）
 * ------------------------------------------------------------------------- */
.category-tags {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 1000px;
  margin: 0 auto 36px;
  overflow: hidden; /* 轨道平移，外框无滚动条 */
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

.cat-tag-row {
  display: flex;
  width: max-content;
}

.cat-tag-row--left  { animation: tags-scroll-left 60s linear infinite; }
.cat-tag-row--right { animation: tags-scroll-right 66s linear infinite; }
.cat-tag-row--tags  { animation: tags-scroll-left 80s linear infinite; margin-top: 2px; }

.category-tags:hover .cat-tag-row { animation-play-state: paused; }

@keyframes tags-scroll-left {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@keyframes tags-scroll-right {
  from { transform: translateX(-50%); }
  to   { transform: translateX(0); }
}

.cat-tag-track {
  display: flex;
  gap: 10px;
  padding-right: 10px;
  flex-shrink: 0;
}

.cat-tag,
.tpl-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  white-space: nowrap;
  transition: all var(--t-fast) var(--ease);
}

.cat-tag:hover,
.tpl-tag:hover {
  color: var(--primary);
  border-color: var(--primary-soft-2);
  background: var(--primary-soft);
}

.cat-tag-count {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-3);
  padding: 0 7px;
  background: var(--bg-soft);
  border-radius: var(--r-pill);
}

.cat-tag:hover .cat-tag-count {
  color: var(--primary);
  background: #fff;
}

/* ---------------------------------------------------------------------------
 * 5. Hero 统计数据
 * ------------------------------------------------------------------------- */
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 132px;
  padding: 14px 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow-sm);
}

.stat b {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.stat span {
  font-size: 12.5px;
  color: var(--text-3);
}