/* ============================================================
   Base — reset、排版基礎、全域可及性輔助
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

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

body {
  font-family: var(--font-family-base);
  background: var(--color-bg-canvas);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  line-height: var(--lh-base);
  -webkit-font-smoothing: antialiased;
  transition: background var(--motion-base) var(--motion-easing), color var(--motion-base) var(--motion-easing);
  min-height: 100vh;
}

img, svg { max-width: 100%; display: block; }

h1, h2, h3, h4 { margin: 0; font-weight: var(--font-weight-bold); }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }
table { border-collapse: collapse; }

a { color: var(--color-text-link); }

/* ---------- 無障礙輔助 ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--space-3); top: -48px;
  background: var(--color-primary-default); color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
  z-index: var(--z-modal); transition: top var(--motion-fast) var(--motion-easing);
  font-weight: var(--font-weight-semibold); font-size: var(--font-size-sm);
}
.skip-link:focus { top: var(--space-3); }

/* focus-visible 全域備援：任何互動元件都不可只用 outline:none 而無替代 */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  box-shadow: var(--shadow-focus-ring);
}

/* ---------- 版面容器 ---------- */
.liff-root { min-height: 100vh; display: flex; flex-direction: column; }
.admin-root { min-height: 100vh; display: flex; flex-direction: column; }

.container-narrow {
  max-width: 480px;
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--space-4);
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container-wide { padding: 0 var(--space-8); }
}

.visually-hidden-mobile { display: none; }
@media (min-width: 768px) { .visually-hidden-mobile { display: initial; } }

/* ---------- 動態減弱 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .btn:active, .chip:active, .coach-card:active { transform: none !important; }
}

/* ---------- 橫向捲動容器（表格、寬內容） ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }