/* =========================
   BASE / TOKENS / COMPONENTS
========================= */
:root{
  --primary:#0b2a4a;
  --primary-2:#163a5f;
  --accent:#2ecc71;

  --bg:#f6f8fb;
  --card:#ffffff;

  --text:#0f172a;
  --muted:#64748b;
  --border:#e5e7eb;

  --radius:14px;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.06);

  --danger:#d93025;
  --focus: rgba(46, 204, 113, .35);
}

*{ margin:0; padding:0; box-sizing:border-box; }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }

body{
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

small{ font-size: 12px; }

/* ===== Containers ===== */
.container-xl{
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
.container-sm{
  max-width: 520px;
  margin: 0 auto;
  padding: 0 12px;
}

/* ===== Card ===== */
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* ===== Buttons (unified) ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn:disabled{ opacity:.6; cursor:not-allowed; }

.btn-primary{ background: var(--primary); color:#fff; }
.btn-primary:hover{ background: var(--primary-2); }

.btn-outline{
  background:#fff;
  border-color: var(--border);
  color: #111827;
}
.btn-outline:hover{
  border-color: #cbd5e1;
  background: #f8fafc;
}

.btn-ghost{
  background: transparent;
  border-color: rgba(11,42,74,.2);
  color: var(--primary);
}
.btn-ghost:hover{ background: rgba(11,42,74,.06); }

.btn-outline-light{
  background: transparent;
  border-color: rgba(255,255,255,.5);
  color:#fff;
}
.btn-outline-light:hover{ background: rgba(255,255,255,.12); }

/* ===== Forms ===== */
.c-field{ width:100%; }
.c-label{ font-weight: 700; margin-bottom: 6px; }
.c-required{ color: var(--danger); margin-left: 6px; }

.c-input, .c-select{
  width:100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  transition: box-shadow .15s ease, border-color .15s ease;
}
.c-input:focus, .c-select:focus{
  outline:none;
  border-color: rgba(46,204,113,.6);
  box-shadow: 0 0 0 4px var(--focus);
}

.c-help{
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.c-msg{
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
}
.c-msg--ok{
  background: #e9f7ef;
  border: 1px solid #bfe7d0;
  color: #146c43;
}
.c-msg--err{
  background: #fdecec;
  border: 1px solid #f5c2c7;
  color: #b02a37;
}

/* ===== Compatibility ALIASES (để anh không phải sửa HTML ngay) ===== */
/* Old auth look -> map sang system mới từ từ */
.container{ max-width: 490px; margin: 0 auto; }          /* alias */
.page-title{ max-width: 520px; margin: 0 auto 16px; padding: 0 12px; font-size: 22px; font-weight: 700; }

.input{ /* alias for old class */
  width:100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
}
.input:focus{
  outline:none;
  border-color: rgba(46,204,113,.6);
  box-shadow: 0 0 0 4px var(--focus);
}

.confirm-btn{ /* alias */
  composes: btn btn-primary; /* (CSS chuẩn không có composes; để tránh lỗi, anh dùng 2 class dần) */
}
.back-btn{ /* alias: để tạm giữ, sau sẽ chuyển thành btn-outline */
}