/* =====================================================================
   common.css
   ---------------------------------------------------------------------
   Reset, design tokens (màu/font/spacing), và các thành phần dùng
   chung cho mọi trang: card, button, form input, thông báo lỗi.
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&display=swap');

/* ---- Design tokens ---- */
:root {
  /* Màu nền & chữ */
  --color-bg: #FAFAF7;
  --color-surface: #FFFFFF;
  --color-text: #1C1917;
  --color-text-muted: #6B6560;
  --color-border: #E7E3DC;

  /* Màu điểm nhấn */
  --color-primary: #4C3A6E;       /* tím than — điểm nhấn chính, nút, tiêu đề */
  --color-primary-hover: #3A2C56;
  --color-accent: #E8A0A0;        /* hồng đào — điểm nhấn phụ, hover nhẹ */
  --color-accent-soft: #FBEEEE;

  /* Trạng thái */
  --color-success: #2D6A4F;
  --color-success-soft: #E7F3ED;
  --color-danger: #B5424D;
  --color-danger-soft: #FCEBEC;
  --color-warning: #B5842D;

  /* Typography */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 0.875rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;

  /* Bo góc & bóng — dùng nhẹ, không phô trương */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 1px 2px rgba(28, 25, 23, 0.04), 0 8px 24px rgba(28, 25, 23, 0.06);
}

/* ---- Reset ---- */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3, legend {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

p {
  margin: 0 0 var(--space-sm) 0;
}

button {
  font-family: inherit;
}

/* Focus rõ ràng cho điều hướng bàn phím — không bỏ qua accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---- Layout chung ---- */
.page-container {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-container--wide {
  max-width: 960px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-lg);
}

@media (max-width: 480px) {
  .card {
    padding: var(--space-md);
    border-radius: var(--radius-md);
  }
  .page-container {
    padding: var(--space-md) var(--space-sm);
  }
}

/* ---- Site header nhỏ, dùng lặp lại vài trang ---- */
.site-eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

/* ---- Form ---- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.form-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
  outline: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* ---- Button ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-body);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease, opacity 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--color-primary);
}

.btn-small {
  padding: 0.4rem 0.875rem;
  font-size: 0.8125rem;
  border-radius: 6px;
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  cursor: pointer;
}

.btn-small:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-danger {
  background: var(--color-danger-soft);
  color: var(--color-danger);
  border-color: transparent;
}

.btn-danger:hover {
  background: var(--color-danger);
  color: #FFFFFF;
}

/* ---- Thông báo lỗi / trạng thái ---- */
.error-message {
  background: var(--color-danger-soft);
  color: var(--color-danger);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  margin-top: var(--space-sm);
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  padding: var(--space-lg) 0;
  font-size: 0.9375rem;
}

.hidden {
  display: none !important;
}

/* ---- Footer nhỏ ---- */
.site-footer {
  margin-top: auto;
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.site-footer a {
  color: var(--color-text-muted);
}