/* =========================================================
   键艺 KeyCraft — 基础重塑（全局字号、首页 Hero、指法手图）
   加载顺序：style.css → base.css → practice.css / game.css / settings.css
   ========================================================= */

:root {
  --fs-display: clamp(34px, 3.6vw, 52px);
  --fs-h1: clamp(27px, 2.9vw, 40px);
  --fs-h2: clamp(21px, 2.1vw, 30px);
  --fs-h3: 17px;
  --fs-body: 14px;
  --fs-small: 12px;
  --hero-kb-w: 520px;
}

/* ---------- 全局偏好：减少动效 / 紧凑密度 ---------- */
html[data-reduce-motion="true"] *,
html[data-reduce-motion="true"] *::before,
html[data-reduce-motion="true"] *::after {
  animation-duration: 0.001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.001ms !important;
  scroll-behavior: auto !important;
}

html[data-density="compact"] .section {
  padding: 56px 0;
}

html[data-density="compact"] .page-hero {
  padding: 40px 0 32px;
}

html[data-density="compact"] .hero {
  padding: 46px 0 42px;
}

/* ---------- 全局标题：整体缩小一档 ---------- */
.hero h1 {
  max-width: 12em;
  margin: 22px 0 20px;
  font-size: var(--fs-display);
  letter-spacing: -0.045em;
  line-height: 1.06;
}

.page-hero h1 {
  margin-top: 20px;
  font-size: var(--fs-h1);
  letter-spacing: -0.04em;
  line-height: 1.14;
}

.section-title {
  font-size: var(--fs-h2);
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.cta-band h2 {
  font-size: clamp(24px, 2.6vw, 34px);
  letter-spacing: -0.035em;
}

.keyboard-feature-copy h2,
.hand-guide-copy h2 {
  font-size: clamp(24px, 2.5vw, 34px);
  letter-spacing: -0.03em;
}

.course-title-row h1 {
  font-size: clamp(30px, 3.4vw, 42px);
  letter-spacing: -0.04em;
}

.lesson-head h1 {
  font-size: clamp(28px, 3.2vw, 38px);
  letter-spacing: -0.04em;
}

.course-card h3 {
  font-size: 20px;
}

.course-card p {
  font-size: 12px;
}

.section-sub,
.page-hero .lead {
  font-size: 14px;
  line-height: 1.8;
}

.hero-desc {
  font-size: 15px;
  line-height: 1.8;
}

.page-hero {
  padding: 54px 0 42px;
}

.section {
  padding: 78px 0;
}

.section-head {
  margin-bottom: 36px;
}

/* ---------- 首页 Hero：标题在左，固定尺寸键盘在右，不换行 ---------- */
.hero {
  padding: 64px 0 58px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1fr) var(--hero-kb-w);
  align-items: center;
  gap: clamp(28px, 4vw, 56px);
}

.hero-copy {
  min-width: 0;
  padding-top: 0;
}

.hero h1 .line {
  display: block;
  white-space: nowrap;
}

.hero h1 .accent-line {
  display: block;
  width: fit-content;
}

.hero-visual {
  width: var(--hero-kb-w);
  max-width: var(--hero-kb-w);
  justify-self: end;
}

.hero-card {
  padding: 14px;
  border-radius: 12px;
}

.hero-card-bar {
  margin-bottom: 12px;
}

.hero-typing-line {
  min-height: 46px;
  margin: 0 2px 12px;
  font-size: 15px;
}

.hero-card .kb,
.hero-card .kb-row {
  flex-wrap: nowrap;
  white-space: nowrap;
}

.hero-card .kb {
  width: 100%;
  min-width: 0;
  --kb-gap: 2px;
  --kb-pad: 7px;
  --kb-font: 8.5px;
}

.hero-card .kb .kb-key {
  flex-shrink: 1;
  height: 30px;
}

.hero-card .kb .kb-key .sub {
  font-size: 0.72em;
}

.hero-card-foot {
  margin-top: 12px;
  padding-top: 11px;
  font-size: 8px;
}

.hero-meta {
  margin-top: 34px;
  padding-top: 18px;
}

/* 1024–1120：仍然并排，键盘等比缩小 */
@media (min-width: 961px) and (max-width: 1120px) {
  :root {
    --hero-kb-w: 410px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 410px;
    gap: 28px;
  }

  .hero-card .kb {
    --kb-pad: 5px;
    --kb-gap: 1.5px;
    --kb-font: 7.2px;
  }

  .hero-card .kb .kb-key {
    height: 26px;
  }

  .hero h1 {
    font-size: clamp(32px, 4.1vw, 44px);
  }
}

/* 手机端首页标题：允许换行，不再被裁切 */
@media (max-width: 960px) {
  .hero {
    padding: 44px 0 42px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-visual {
    width: 100%;
    max-width: 560px;
    justify-self: start;
  }

  .hero h1 {
    max-width: none;
  }

  .hero h1 .line {
    white-space: normal;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 34px 0 34px;
  }

  .hero-kicker .no-grad {
    display: none;
  }

  .hero h1 {
    margin: 18px 0 16px;
    font-size: clamp(29px, 8.6vw, 38px);
    letter-spacing: -0.035em;
    line-height: 1.1;
  }

  .hero-desc {
    font-size: 13.5px;
    line-height: 1.75;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .hero-meta {
    margin-top: 26px;
    padding-top: 16px;
  }

  .hero-meta div {
    min-width: 50%;
    padding-right: 12px;
  }

  .hero-meta div + div {
    padding-left: 0;
    border-left: 0;
  }

  .hero-meta div:nth-child(even) {
    padding-left: 12px;
    border-left: 1px solid var(--line);
  }

  .hero-meta dt {
    font-size: 8px;
  }

  .hero-meta dd {
    font-size: 17px;
  }

  .hero-visual {
    max-width: 100%;
  }

  .hero-card {
    padding: 10px;
  }

  .hero-card .kb {
    --kb-font: 6.4px;
    --kb-pad: 5px;
    --kb-gap: 1.5px;
  }

  .hero-card .kb .kb-key {
    height: 24px;
    border-radius: 3px;
  }

  .hero-card .kb .kb-key--home::after {
    bottom: 3px;
    width: 6px;
  }

  .hero-typing-line {
    min-height: 34px;
    font-size: 12px;
    letter-spacing: 0;
  }

  .hero-card-foot {
    display: none;
  }

  .hero-card-code {
    display: none;
  }

  .hero-card-bar {
    margin-bottom: 8px;
  }
}

/* ---------- 首页滚动吸附：一个区块 = 一屏（仅桌面端） ---------- */
@media (min-width: 1200px) {
  html.home-snap {
    scroll-snap-type: y mandatory;
  }

  html.home-snap .hero,
  html.home-snap .section,
  html.home-snap .section-tight {
    display: flex;
    min-height: calc(100vh - var(--header-h, 66px));
    flex-direction: column;
    justify-content: center;
    padding-top: 30px;
    padding-bottom: 30px;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    scroll-margin-top: var(--header-h, 66px);
  }

  html.home-snap .section-head {
    margin-bottom: 26px;
  }

  html.home-snap .course-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  html.home-snap .course-card {
    min-height: 280px;
    padding: 22px;
  }

  html.home-snap .course-card h3 {
    margin-top: 18px;
    font-size: 20px;
  }

  html.home-snap .course-card p {
    margin-top: 10px;
    font-size: 12.5px;
    line-height: 1.65;
  }

  html.home-snap .course-card-bottom {
    padding-top: 16px;
  }

  html.home-snap .hero {
    padding-top: 34px;
    padding-bottom: 34px;
  }

  html.home-snap .site-footer {
    scroll-snap-align: start;
    scroll-margin-top: var(--header-h, 66px);
  }
}

/* ---------- 键盘样式 / 大小 / 整体缩放 ---------- */
html[data-keyboard-style="soft"] .kb-key {
  border-radius: 9px;
}

html[data-keyboard-style="raised"] .kb-key {
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

html[data-keyboard-style="outline"] .kb {
  border: 1px solid var(--line);
  background: transparent;
}

html[data-keyboard-style="outline"] .kb-key {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

html[data-keyboard-style="outline"] .kb-key.is-next,
html[data-keyboard-style="outline"] .kb-key.is-down {
  box-shadow: inset 0 0 0 1px var(--line-strong), 0 0 0 2px var(--accent);
}

html[data-keyboard-size="s"] .kb {
  --kb-font: clamp(8px, 0.72vw, 11px);
}

html[data-keyboard-size="l"] .kb {
  --kb-font: clamp(11px, 1.06vw, 15px);
}

html[data-ui-scale="compact"] #app {
  zoom: 0.94;
}

html[data-ui-scale="large"] #app {
  zoom: 1.08;
}

/* ---------- 指法页：手图加上手指颜色提示 ---------- */
.hand-guide-figure {
  position: relative;
}

.hand-visual {
  position: relative;
  display: block;
  width: 100%;
}

.hand-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  aspect-ratio: 2732 / 1535;
  object-fit: contain;
}

.hand-spots {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hand-spot {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transform: translate(-50%, -6px);
}

.hand-spot i {
  display: block;
  width: 13px;
  height: 13px;
  border: 2px solid var(--panel);
  border-radius: 50%;
  background: var(--fc);
  box-shadow: 0 0 0 1px var(--fc);
}

.hand-spot b {
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--panel);
  color: var(--fc);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  white-space: nowrap;
}

.hand-color-legend {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin-top: 12px;
  border: 1px solid var(--line);
  background: var(--line);
}

.hand-color-legend > span {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 7px;
  padding: 8px 9px;
  background: var(--panel-2);
  font-size: 10px;
  white-space: nowrap;
}

.hand-color-legend i {
  display: block;
  width: 9px;
  height: 9px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--fc);
}

.hand-color-legend em {
  margin-left: auto;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 8px;
  font-style: normal;
}

.hand-color-legend small {
  flex-basis: 100%;
  margin-left: 16px;
  overflow: hidden;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 8px;
  text-overflow: ellipsis;
}

@media (max-width: 900px) {
  .hand-color-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .hand-color-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hand-spot b {
    padding: 0 2px;
    font-size: 7.5px;
  }

  .hand-spot i {
    width: 10px;
    height: 10px;
  }
}