* { box-sizing: border-box; }
body { margin: 0; background: #f3f0e8; color: #1f2b26; }
.practice-shell { width: min(960px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0; }
.button-demo { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 50px; }
/* DONE-01：按鈕已有一致基底尺寸、圓角與字重。 */
.button { display: inline-flex; padding: 12px 20px; border: 2px solid transparent; border-radius: 10px; color: inherit; font-weight: 800; text-decoration: none; }
/* DONE-02：主要與次要按鈕已有清楚用途變體。 */
.button--primary { background: #0c7656; color: white; }
.button--secondary { border-color: #0c7656; color: #0c7656; }
.component-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
/* DONE-03：不同內容卡片已共用邊框、留白與背景。 */
.component-card { padding: 24px; border: 1px solid #bdc9c2; border-radius: 16px; background: white; }
.component-card__label { color: #0c7656; font-weight: 900; }
.contact-panel { margin-top: 32px; }