/* ProofOfWant — design system dùng chung cho 4 trang (nguồn: claude.ai/design "ProofOfWant" 2026-07-18).
   Giấy kem + mực đen + xanh lá. MỘT theme sáng duy nhất (không dark mode). */

:root {
  --paper: #F7F3EC;          /* nền trang */
  --paper-alt: #F2EDE3;      /* dải nền phụ */
  --card: #FFFDF8;           /* nền thẻ */
  --card-soft: #F9F6EF;      /* footer thẻ/panel */
  --ink: #1C1913;            /* mực chính + nền section tối */
  --ink-70: #38332A;         /* body text đậm */
  --ink-60: #4A453B;         /* body text nhạt */
  --muted: #6E675A;          /* nhãn mono, phụ chú */
  --line: rgba(28, 25, 19, .12);
  --line-2: rgba(28, 25, 19, .16);
  --line-3: rgba(28, 25, 19, .25);
  --green: #2E7B50;
  --green-dark: #1F5C3A;
  --green-soft: rgba(46, 123, 80, .1);
  --green-line: rgba(46, 123, 80, .3);
  --mint: #7FB894;           /* accent trên nền tối */
  --mint-bright: #9BCBAC;
  --amber: #B47E10;          /* grade B / cảnh báo nhẹ */
  --amber-line: rgba(180, 126, 16, .4);
  --red: #A8422E;            /* từ chối / lỗi */
  --dark-text: #F3EFE7;      /* chữ trên nền tối */
  --dark-muted: rgba(243, 239, 231, .7);
  --dark-line: rgba(243, 239, 231, .15);
  --font-display: 'Bricolage Grotesque', 'Be Vietnam Pro', system-ui, sans-serif;
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --maxw: 1160px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { font-family: var(--font-display); letter-spacing: -.02em; line-height: 1.15; margin: 0; text-wrap: balance; }
p { margin: 0; }
a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-dark); }
::selection { background: var(--green); color: var(--paper); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* Nhãn mono nhỏ (kicker/eyebrow) */
.kicker {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--green); font-weight: 600;
}
.kicker.muted { color: var(--muted); letter-spacing: .12em; }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 243, 236, .92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-family: var(--font-display); font-weight: 700; font-size: 18px; letter-spacing: -.02em; }
.brand:hover { color: var(--ink); }
.brand .mark {
  width: 26px; height: 26px; background: var(--ink); color: var(--paper); flex: 0 0 auto;
  display: grid; place-items: center; font-family: var(--font-display);
  font-weight: 800; font-size: 15px; border-radius: 6px;
}
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 500; }
.nav-links a { color: var(--ink-60); }
.nav-links a:hover { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: 12px; }
.nav-auth { display: flex; align-items: center; gap: 12px; }
.who { display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 500; color: var(--ink-60); }
.avatar { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; border: 1px solid var(--line-3); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-sans); font-size: 14.5px; font-weight: 600;
  padding: 11px 20px; border-radius: 6px; border: 1.5px solid transparent;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background .15s ease, border-color .15s ease, color .15s ease, transform .12s ease;
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--green); color: var(--paper); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-3); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }
.btn-mint { background: var(--mint); color: var(--ink); font-weight: 700; }
.btn-mint:hover { background: var(--mint-bright); color: var(--ink); }
.btn-dark-ghost { background: transparent; color: var(--dark-text); border-color: rgba(243, 239, 231, .35); }
.btn-dark-ghost:hover { border-color: var(--mint); color: var(--mint); }
.btn[disabled] { opacity: .6; cursor: default; pointer-events: none; }

/* Badge mono (grade / market / trạng thái) */
.badge-m {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: .1em;
  padding: 4px 9px; border-radius: 4px; display: inline-flex; align-items: center; gap: 6px;
  text-transform: uppercase; white-space: nowrap;
}
.badge-market { color: var(--green); background: var(--green-soft); }
.badge-type { color: var(--muted); border: 1px solid rgba(28, 25, 19, .18); letter-spacing: .08em; font-weight: 500; }
.badge-grade-a { color: var(--green); background: var(--green-soft); border: 1px solid var(--green-line); }
.badge-grade-b { color: var(--amber); background: rgba(180, 126, 16, .08); border: 1px solid rgba(180, 126, 16, .35); }
.badge-grade-c { color: var(--muted); background: rgba(110, 103, 90, .08); border: 1px solid rgba(110, 103, 90, .35); }
.badge-free { color: var(--green); border: 1px solid var(--green-line); }
.badge-amber { color: var(--amber); border: 1px solid var(--amber-line); }

/* Con dấu "ĐÁNG BUILD" */
.stamp {
  display: inline-block; border: 2.5px solid var(--green); color: var(--green);
  font-family: var(--font-mono); font-weight: 600; font-size: 12.5px; letter-spacing: .22em;
  padding: 8px 16px; border-radius: 4px; text-transform: uppercase; white-space: nowrap;
}

/* Card */
.card {
  background: var(--card); border: 1px solid var(--line-2); border-radius: 10px;
}

/* Footer */
footer.site { border-top: 1px solid var(--line); }
footer.site .foot {
  max-width: var(--maxw); margin: 0 auto; padding: 26px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
footer.site .note { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }

/* Toast */
.toast-wrap { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 10px; align-items: center; width: max-content; max-width: calc(100vw - 32px); pointer-events: none; }
.toast {
  display: flex; align-items: center; gap: 10px; background: var(--card); color: var(--ink);
  border: 1px solid var(--line-3); border-radius: 8px;
  box-shadow: 0 16px 36px -18px rgba(28, 25, 19, .4); padding: 12px 16px;
  font-size: 14px; font-weight: 500; pointer-events: auto;
  animation: toastIn .28s cubic-bezier(.16, 1, .3, 1); max-width: 92vw;
}
.toast.out { animation: toastOut .25s ease forwards; }
.toast svg { color: var(--green); flex: 0 0 auto; }
.toast.info svg { color: var(--amber); }
.toast.warn svg { color: var(--red); }
@keyframes toastIn { from { opacity: 0; transform: translateY(12px); } }
@keyframes toastOut { to { opacity: 0; transform: translateY(12px); } }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 150; background: rgba(28, 25, 19, .5); backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center; padding: 20px;
  opacity: 0; pointer-events: none; transition: opacity .2s;
}
.modal-backdrop.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--card); border: 1px solid rgba(28, 25, 19, .2); border-radius: 12px;
  box-shadow: 0 32px 64px -24px rgba(28, 25, 19, .5); width: 100%; max-width: 460px; padding: 28px;
  transform: translateY(10px) scale(.98); transition: transform .22s cubic-bezier(.16, 1, .3, 1);
}
.modal-backdrop.open .modal { transform: none; }
.modal h3 { font-size: 21px; font-weight: 800; letter-spacing: -.015em; }
.modal .msub { color: var(--ink-60); font-size: 14px; margin-top: 8px; line-height: 1.6; }

@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
  .nav-links { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}