/* Thanh phan dung chung: nut, o nhap, the. FE1 mo rong trong task FE-01. */

a.content-source-link { color: #0b6bcb; font-weight: 700; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; border-radius: 3px; }
a.content-source-link:hover { color: #0759a8; background: #e9f2fc; }
a.content-source-link:focus-visible { outline: 2px solid #0b6bcb; outline-offset: 3px; }

/* ---- Nut ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 24px;
  font: inherit; font-size: 0.9375rem; font-weight: 700; text-decoration: none;
  border: 0; border-radius: var(--radius-sm); cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.btn--sm { min-height: 40px; padding: 0 16px; font-size: var(--fs-small); }
.btn--lg { min-height: 52px; padding: 0 26px; }
.btn--primary { background: var(--c-brand); color: #fff; }             /* fbtn */
.btn--primary:hover { background: var(--c-brand-600); color: #fff; }
.btn--danger { background: var(--c-danger); color: #fff; }             /* rbtn */
.btn--danger:hover { background: var(--c-danger-600); color: #fff; }
.btn--outline { background: #fff; color: var(--c-brand); border: 1px solid var(--c-border); } /* obtn */
.btn--outline:hover { border-color: var(--c-brand); background: var(--c-tint); color: var(--c-brand); }
.btn--white { background: #fff; color: var(--c-brand); }               /* wbtn */
.btn--white:hover { background: var(--c-tint); color: var(--c-brand); }
.btn:disabled { background: #E7DCDB; color: var(--c-text-4); cursor: not-allowed; }

/* ---- O nhap ---- */
.field {
  width: 100%; min-width: 0; height: 48px; padding: 0 14px;
  font: inherit; color: var(--c-text); background: #fff;
  border: 1px solid var(--c-border-input); border-radius: var(--radius-sm);
  transition: border-color .2s ease, box-shadow .2s ease;
}
textarea.field { height: auto; padding: 12px 14px; }
.field:focus { outline: none; border-color: var(--c-brand); box-shadow: 0 0 0 3px rgba(229, 57, 53, .22); }

/* ---- The ---- */
.card { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow-card); }
.lift { transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease); }
.lift:hover, .lift:focus-visible, .lift:focus-within { transform: translateY(-6px); border-color: var(--c-accent); box-shadow: var(--shadow-hover); }

/* ---- Khung trang tạm; Header/Footer có stylesheet riêng ---- */
.page-hero { background: var(--c-brand); color: #fff; padding: 88px 0; }
.page-hero h1 { font-size: var(--fs-hero); line-height: 1.15; letter-spacing: -.03em; margin-top: 16px; }
.page-hero p { margin-top: 16px; font-size: var(--fs-lead); color: var(--c-on-brand-muted); max-width: 560px; }
.stub { margin: 48px 0; padding: 24px 28px; border: 1px dashed var(--c-border-input); border-radius: var(--radius); color: var(--c-text-3); }
.stub code { background: var(--c-bg-soft-2); padding: 2px 6px; border-radius: 3px; }