/* ==========================================================================
   KIM GIA BẢO GIFT – BẢO TÍN MẠNH HẢI
   DESIGN TOKENS & BRAND IDENTITY (VÀNG KIM • CHAMPAGNE • TRẮNG KEM • NÂU VÀNG)
   ========================================================================== */

:root {
  /* Bảng màu chủ đạo chuẩn thương hiệu */
  --color-gold-primary: #C89B3C;
  --color-gold-bright: #E4C373;
  --color-gold-deep: #9B701E;
  --color-champagne: #F1E0B2;
  --color-champagne-soft: #F7EDD2;
  --color-cream-bg: #FDFBF7;
  --color-cream-warm: #FAF4E8;
  --color-beige-surface: #F4ECE0;
  --color-beige-card: #EFE4D3;
  --color-brown-gold: #5A4016;
  --color-brown-dark: #3E2A0B;
  --color-brown-muted: #7D5B24;
  --color-white-pure: #FFFFFF;

  /* Gradient ánh kim sang trọng */
  --grad-gold-metallic: linear-gradient(135deg, #9E721E 0%, #DFBE6F 45%, #C89B3C 75%, #8F6516 100%);
  --grad-gold-button: linear-gradient(135deg, #B5862A 0%, #DFBD69 50%, #B8892D 100%);
  --grad-champagne-card: linear-gradient(165deg, rgba(255, 253, 249, 0.96) 0%, rgba(244, 236, 224, 0.92) 100%);
  --grad-cream-backdrop: radial-gradient(circle at 50% 25%, #FFFDF9 0%, #FAF3E6 55%, #F2E5CE 100%);

  /* Đổ bóng & Viền ánh vàng */
  --border-gold-thin: 1px solid rgba(200, 155, 60, 0.35);
  --border-gold-strong: 1.5px solid rgba(200, 155, 60, 0.72);
  --shadow-luxury-sm: 0 8px 24px rgba(90, 64, 22, 0.08);
  --shadow-luxury-md: 0 18px 45px rgba(90, 64, 22, 0.13);
  --shadow-gold-glow: 0 10px 32px rgba(200, 155, 60, 0.32);

  /* Typography hỗ trợ tiếng Việt sắc nét */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Bo góc & Khoảng cách */
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-pill: 999px;

  /* Tỉ lệ phóng chữ cho chế độ trình chiếu LED */
  --ui-scale: 1;
}

body.stage-mode {
  --ui-scale: 1.15;
}

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

html {
  font-size: calc(16px * var(--ui-scale));
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-brown-gold);
  background: var(--grad-cream-backdrop);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  display: block;
}

button,
input,
textarea,
select {
  font-family: inherit;
}

.is-hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

/* Chữ ánh kim sang trọng */
.text-gold-gradient {
  background: var(--grad-gold-metallic);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Nút bấm cao cấp chuẩn thương hiệu */
.btn-luxury {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.28s ease, background 0.28s ease;
  overflow: hidden;
  user-select: none;
}

.btn-luxury--primary {
  background: var(--grad-gold-button);
  color: var(--color-brown-dark);
  border: 1px solid rgba(255, 248, 225, 0.75);
  box-shadow: var(--shadow-gold-glow), inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.btn-luxury--primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -120%;
  width: 75%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: skewX(-22deg);
  transition: left 0.65s ease;
}

.btn-luxury--primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 14px 36px rgba(200, 155, 60, 0.45);
}

.btn-luxury--primary:hover::after {
  left: 140%;
}

.btn-luxury--primary:active {
  transform: translateY(0) scale(0.99);
}

.btn-luxury--ghost {
  background: rgba(255, 252, 245, 0.82);
  color: var(--color-brown-gold);
  border: var(--border-gold-strong);
  box-shadow: var(--shadow-luxury-sm);
}

.btn-luxury--ghost:hover {
  background: var(--color-champagne-soft);
  transform: translateY(-2px);
}

.btn-luxury--lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

.btn-luxury--xl {
  padding: 1.15rem 2.75rem;
  font-size: 1.12rem;
  letter-spacing: 0.08em;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.84rem;
}

.btn-full {
  width: 100%;
}

/* Modal dùng chung */
.luxury-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.luxury-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(62, 42, 11, 0.48);
  backdrop-filter: blur(6px);
}

.luxury-modal__dialog {
  position: relative;
  width: 100%;
  max-width: 640px;
  max-height: 88vh;
  overflow-y: auto;
  background: var(--grad-champagne-card);
  border: 1.5px solid var(--color-gold-primary);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 28px 65px rgba(62, 42, 11, 0.25);
  animation: modalFadeIn 0.3s ease;
}

.luxury-modal__dialog--wide {
  max-width: 960px;
}

.luxury-modal__close {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: var(--border-gold-strong);
  background: var(--color-cream-bg);
  color: var(--color-brown-gold);
  font-size: 1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease, transform 0.2s ease;
}

.luxury-modal__close:hover {
  background: var(--color-champagne);
  transform: rotate(90deg);
}

.luxury-modal__header {
  text-align: center;
  margin-bottom: 1.35rem;
}

.luxury-modal__title {
  font-family: var(--font-display);
  font-size: 1.65rem;
  color: var(--color-brown-dark);
  margin: 0.35rem 0 0;
}

.luxury-modal__footer {
  margin-top: 1.5rem;
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}