:root {
  --color-navy: #1E3A8A;
  --color-blue: #0F6CBD;
  --color-blue-light: #4FA3FF;
  --color-cyan: #00C2FF;
  --color-cyan-soft: #66D9FF;
  --color-cyan-pale: #AEEBFF;
  --color-orange: #FF6A00;
  --color-orange-light: #FFA64D;
  --color-bg: #F5FAFF;
  --color-white: #FFFFFF;
  --color-text: #102326;
  --color-muted: #4B5563;
  --color-border: #D7E8F7;

  --gradient-blue: linear-gradient(135deg, #1E3A8A 0%, #0F6CBD 100%);
  --gradient-cta: linear-gradient(135deg, #FF6A00 0%, #FFA64D 100%);
  --gradient-cta-hover: linear-gradient(135deg, #E85F00 0%, #FF8F2E 100%);

  --shadow-soft: 0 18px 45px rgba(30, 58, 138, 0.12);
  --shadow-card: 0 10px 30px rgba(15, 108, 189, 0.10);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;

  /* Trạng thái form — chức năng UX, không phải màu thương hiệu */
  --color-error: #c0392b;
  --color-success-bg: #e6f6ea;
  --color-success-text: #1f7a3d;

  --max-width: 1100px;
  --font-base: Inter, "Segoe UI", Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  margin: 0 0 0.5em;
}

h2 {
  font-size: 1.9rem;
  text-align: center;
  margin-bottom: 0.5em;
  color: var(--color-navy);
}

.section-intro {
  max-width: 640px;
  margin: 0 auto 32px;
  text-align: center;
  color: var(--color-muted);
}

p {
  margin: 0 0 1em;
}

a {
  color: inherit;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.85em 1.7em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease,
    box-shadow 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--gradient-cta);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--gradient-cta-hover);
  box-shadow: 0 10px 24px rgba(255, 106, 0, 0.3);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-navy);
  color: var(--color-navy);
}

.btn-outline:hover {
  background: var(--color-bg);
}

.btn-small {
  padding: 0.55em 1.1em;
  font-size: 0.9rem;
}

.btn-full {
  width: 100%;
  text-align: center;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-white);
  z-index: 10;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  line-height: 1.3;
}

.logo-title {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--color-navy);
}

.logo-tagline {
  font-weight: 500;
  font-size: 0.7rem;
  color: var(--color-muted);
}

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.main-nav a {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-navy);
}

.main-nav a:hover {
  color: var(--color-blue);
}

.main-nav a.nav-cta {
  color: var(--color-white);
}

.main-nav a.nav-cta:hover {
  color: var(--color-white);
}

/* Hero */
/* Banner chương trình Mùa vàng chỉnh nha */
.campaign-hero {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-white) 100%);
  padding: 24px 20px 12px;
}

.campaign-hero-inner {
  max-width: 1440px;
  margin: 0 auto;
}

.campaign-hero-inner a {
  display: block;
}

.campaign-hero-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 22px;
  box-shadow: var(--shadow-soft);
}

@media (max-width: 768px) {
  .campaign-hero {
    padding: 14px 12px 8px;
  }

  .campaign-hero-image {
    border-radius: 14px;
  }
}

.hero {
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-bg) 100%);
  padding: 32px 0 28px;
}

.hero-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 32px;
}

.hero-text {
  flex: 1 1 400px;
}

.hero-text h1 {
  font-size: 2.2rem;
  color: var(--color-navy);
}

.hero-sub {
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 48ch;
}

.hero-note {
  margin-top: 14px;
  margin-bottom: 0;
  font-size: 0.88rem;
  color: var(--color-muted);
}

.hero-visual {
  flex: 1 1 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #F5FAFF 0%, #EAF5FF 100%);
  border-radius: 28px;
  padding: 20px;
}

.hero-doctor-photo {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  height: auto;
  object-fit: contain;
  border-radius: 16px;
}

/* Trust chips */
.hero-trust {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.hero-trust li {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.hero-trust li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-blue-light);
}

.chip-icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg);
}

.chip-icon img {
  display: block;
}

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-blue-light);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-bg);
  margin-bottom: 12px;
}

.card-icon img {
  display: block;
}

.card h3 {
  color: var(--color-navy);
  font-size: 1.05rem;
}

.card p {
  color: var(--color-muted);
  margin-bottom: 0;
  font-size: 0.95rem;
}

.why-us, .conditions, .early-check, .pre-info, .process {
  padding: 56px 0;
}

.why-us {
  padding: 40px 0;
}

/* Section "Tình trạng" — dạng mô hình răng */
.condition-models {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.condition-model-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.condition-model-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-blue-light);
}

.condition-model-image {
  width: 100%;
  aspect-ratio: 3 / 2;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.condition-model-image img {
  width: 100%;
  max-width: 240px;
  min-width: 180px;
  height: 100%;
  object-fit: contain;
  display: block;
}

.condition-model-title {
  color: var(--color-navy);
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.condition-model-desc {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 14px;
}

.condition-model-cta {
  display: inline-flex;
  align-items: center;
  margin-top: auto;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-white);
  background: var(--gradient-cta);
  padding: 7px 16px;
  border-radius: 999px;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.condition-model-cta:hover {
  box-shadow: 0 8px 18px rgba(255, 106, 0, 0.32);
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  .condition-models {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .condition-models {
    grid-template-columns: 1fr;
  }
}

.why-us h2 {
  margin-bottom: 20px;
}

.why-us-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 22px;
  align-items: start;
}

.why-us-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 1fr;
  gap: 14px;
}

.why-us-grid .card {
  display: flex;
  flex-direction: column;
  padding: 16px 18px;
}

.why-us-grid .card-icon {
  width: 36px;
  height: 36px;
  margin-bottom: 8px;
}

.why-us-grid .card h3 {
  font-size: 0.98rem;
  margin-bottom: 3px;
}

.why-us-grid .card p {
  font-size: 0.86rem;
  line-height: 1.4;
  margin-bottom: 0;
}

.why-us-feedback {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 14px;
  box-shadow: var(--shadow-card);
  text-align: center;
}

.why-us-feedback-label {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.why-us-feedback-image {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 1;
  margin: 0 auto 8px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.why-us-feedback-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.why-us-feedback-caption {
  font-size: 0.76rem;
  line-height: 1.4;
  color: var(--color-muted);
  margin-bottom: 0;
}

@media (max-width: 860px) {
  .why-us-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .why-us-feedback {
    max-width: 320px;
    margin: 0 auto;
  }
}

.conditions {
  background: var(--color-bg);
}

.process {
  background: var(--color-bg);
}

.pre-info {
  background: var(--color-bg);
}

/* Steps — timeline trực quan */
.steps {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px;
}

.steps::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: var(--color-border);
  z-index: 0;
}

.steps li {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
}

.step-visual {
  position: relative;
  width: 64px;
  height: 64px;
  margin-bottom: 14px;
}

.step-icon-badge {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-number {
  position: absolute;
  bottom: -4px;
  right: -4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--gradient-cta);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-white);
}

.steps h3 {
  font-size: 1rem;
  margin-bottom: 0.2em;
  color: var(--color-navy);
}

.steps p {
  color: var(--color-muted);
  font-size: 0.92rem;
  margin-bottom: 0;
  max-width: 26ch;
}

/* Thông tin trước khi niềng răng — 1 khối card liền mạch */
.pre-info-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 40px 44px;
}

.pre-info-card h2 {
  margin-bottom: 28px;
}

.pre-info-inner {
  display: flex;
  align-items: center;
  gap: 40px;
}

.info-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 62%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.info-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.96rem;
  color: var(--color-text);
}

.info-list-icon {
  flex: 0 0 auto;
  margin-top: 1px;
}

.pre-info-visual {
  flex: 0 0 34%;
  background: linear-gradient(135deg, #F5FAFF 0%, #EAF5FF 100%);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.pre-info-visual img {
  display: block;
  max-width: 200px;
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  margin: 0 auto;
}

.pre-info-visual-caption {
  margin: 12px -20px 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-muted);
  white-space: nowrap;
  text-align: center;
}

/* Form */
.form-section {
  background: var(--color-bg);
  padding: 60px 0;
}

.form-section h2 {
  color: var(--color-navy);
}

.form-intro {
  text-align: center;
  color: var(--color-muted);
  margin-bottom: 6px;
}

.form-privacy-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-muted);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  max-width: 480px;
  margin: 0 auto 24px;
}

#lead-form {
  max-width: 540px;
  margin: 0 auto;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-soft);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
  color: var(--color-text);
}

.required {
  color: var(--color-error);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7em 0.8em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: var(--color-white);
  color: var(--color-text);
  resize: vertical;
}

.form-group textarea {
  min-height: 90px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(15, 108, 189, 0.15);
}

.form-group.has-error input,
.form-group.has-error select {
  border-color: var(--color-error);
}

.error-message {
  display: block;
  color: var(--color-error);
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-top: 4px;
}

.form-success {
  margin-top: 16px;
  padding: 14px;
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
}

/* Footer */
.site-footer {
  position: relative;
  background: var(--gradient-blue);
  color: var(--color-white);
  padding: 44px 0;
  background-image: url("assets/footer-pattern.svg"), var(--gradient-blue);
  background-repeat: repeat, no-repeat;
  background-size: 140px 140px, 100% 100%;
}

.footer-icon {
  vertical-align: -2px;
  margin-right: 6px;
  color: var(--color-cyan-pale);
  flex: 0 0 auto;
}

.footer-locations h4 {
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-locations a {
  display: inline-flex;
  align-items: center;
}

.footer-hours {
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  text-align: center;
}

.footer-brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.03em;
}

.footer-locations a {
  color: var(--color-cyan-pale);
  text-decoration: underline;
  font-weight: 600;
}

.footer-locations {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  width: 100%;
}

.footer-locations h4 {
  margin-bottom: 4px;
}

.footer-locations p {
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 0;
  font-size: 0.9rem;
}

.footer-hours,
.footer-website {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
}

.site-footer .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.site-footer .btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
}

.footer-note {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 0;
  max-width: 640px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column;
    gap: 20px;
  }

  /* Quan trọng: reset flex-basis vì ở chế độ column, flex-basis (400px/320px,
     vốn dùng làm chiều RỘNG ưu tiên khi xếp hàng ngang trên desktop) bị trình
     duyệt hiểu thành chiều CAO tối thiểu — gây khoảng trắng ảo rất lớn dưới
     mỗi khối trên mobile. */
  .hero-text,
  .hero-visual {
    flex-basis: auto;
  }

  .hero-visual {
    max-width: 340px;
    margin: 0 auto;
    padding: 14px;
  }

  .hero-doctor-photo {
    max-height: 260px;
  }
}

@media (max-width: 680px) {
  .main-nav a:not(.nav-cta) {
    display: none;
  }
}

@media (max-width: 700px) {
  .steps::before {
    display: none;
  }

  .steps {
    gap: 24px;
  }
}

@media (max-width: 600px) {
  h2 {
    font-size: 1.5rem;
  }

  .hero-text h1 {
    font-size: 1.7rem;
  }

  #lead-form {
    padding: 22px;
    border-radius: var(--radius-md);
  }

  .btn {
    font-size: 0.98rem;
  }

  .footer-locations h4,
  .footer-hours {
    flex-wrap: wrap;
  }
}

/* ==================================================
   MOBILE-FIRST SPACING OVERHAUL (v12)
   Gộp toàn bộ tinh chỉnh khoảng cách/kích thước cho mobile
   vào 2 breakpoint chính, tổ chức theo từng section để dễ
   bảo trì. Đặt cuối file để có độ ưu tiên cascade cao nhất,
   không cần xoá các breakpoint cột (900/860/700/680/560px)
   phía trên — những breakpoint đó chỉ đổi số cột, vẫn giữ
   nguyên logic hoạt động.
   ================================================== */

@media (max-width: 768px) {
  /* Nhịp độ section chung — giảm padding trên/dưới */
  .why-us,
  .conditions,
  .early-check,
  .pre-info,
  .process,
  .form-section {
    padding: 40px 0;
  }

  .why-us {
    padding: 32px 0;
  }

  .why-us h2 {
    margin-bottom: 16px;
  }

  h2 {
    font-size: 1.65rem;
    margin-bottom: 0.4em;
  }

  .section-intro {
    margin-bottom: 20px;
  }

  /* Campaign banner — không để cách header/hero quá xa */
  .campaign-hero {
    padding: 12px 12px 8px;
  }

  /* Hero */
  .hero {
    padding: 28px 0 24px;
  }

  .hero-text h1 {
    font-size: 1.9rem;
    line-height: 1.2;
  }

  .hero-sub {
    line-height: 1.55;
    margin-bottom: 14px;
  }

  .hero-note {
    margin-top: 8px;
  }

  .hero-trust {
    margin-top: 16px;
    gap: 10px;
  }

  .hero-trust li {
    padding: 12px 14px;
  }

  /* Card chung (card-grid dùng ở early-check, why-us, process...) */
  .card-grid {
    gap: 16px;
  }

  .card {
    padding: 18px;
  }

  /* Section Tình trạng */
  .condition-models {
    gap: 16px;
  }

  .condition-model-card {
    padding: 16px;
  }

  .condition-model-image {
    aspect-ratio: auto;
    height: 150px;
    padding: 8px;
    margin-bottom: 10px;
  }

  .condition-model-image img {
    min-width: 0;
    max-width: 100%;
    width: auto;
    height: 100%;
  }

  .condition-model-desc {
    margin-bottom: 10px;
  }

  .condition-model-cta {
    padding: 6px 14px;
    font-size: 0.8rem;
  }

  /* Vì sao khách hàng chọn Hân Đào */
  .why-us-inner {
    gap: 16px;
  }

  .why-us-grid {
    gap: 12px;
  }

  .why-us-grid .card {
    padding: 14px 16px;
  }

  .why-us-grid .card h3 {
    font-size: 1rem;
  }

  .why-us-grid .card p {
    font-size: 0.88rem;
    line-height: 1.48;
  }

  .why-us-feedback {
    padding: 12px;
  }

  /* Quy trình */
  .steps {
    gap: 20px;
  }

  .step-visual {
    margin-bottom: 10px;
  }

  /* Thông tin trước khi niềng răng — 1 cột, ảnh trước danh sách */
  .pre-info-card {
    padding: 26px 22px;
  }

  .pre-info-card h2 {
    margin-bottom: 20px;
  }

  .pre-info-inner {
    flex-direction: column;
    gap: 20px;
  }

  .info-list {
    order: 2;
    gap: 10px;
  }

  .info-list li {
    padding: 12px 14px;
  }

  .pre-info-visual {
    order: 1;
    max-width: 280px;
    margin: 0 auto;
    padding: 16px;
  }

  .pre-info-visual img {
    max-width: 180px;
  }

  .pre-info-visual-caption {
    margin: 10px -16px 0;
    font-size: 0.68rem;
  }

  /* Form */
  #lead-form {
    padding: 20px;
  }

  .form-group {
    margin-bottom: 14px;
  }

  .form-privacy-note {
    margin-bottom: 16px;
  }

  .form-group input,
  .form-group select,
  .form-group textarea {
    min-height: 44px;
  }

  .form-group textarea {
    min-height: 90px;
  }

  #lead-form button[type="submit"] {
    min-height: 48px;
  }

  /* Footer */
  .site-footer {
    padding: 32px 0;
  }

  .footer-inner {
    gap: 16px;
  }

  .footer-locations {
    gap: 14px;
  }
}

@media (max-width: 480px) {
  h2 {
    font-size: 1.5rem;
  }

  .hero-text h1 {
    font-size: 1.75rem;
    line-height: 1.18;
  }

  .hero-text .btn-primary {
    display: block;
    width: 100%;
    text-align: center;
  }

  .hero-inner {
    gap: 16px;
  }

  .hero-visual {
    max-width: 280px;
    padding: 12px;
  }

  .hero-trust {
    margin-top: 14px;
    gap: 8px;
  }

  .why-us {
    padding: 28px 0;
  }

  .campaign-hero {
    padding: 10px 12px 6px;
  }

  .campaign-hero-image {
    max-height: 240px;
    object-fit: contain;
  }

  .card {
    padding: 16px;
  }

  .condition-model-card {
    padding: 14px;
  }

  .condition-model-image {
    height: 130px;
  }

  .why-us-grid .card {
    padding: 14px;
  }

  .pre-info-card {
    padding: 20px 16px;
  }

  .info-list li {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .pre-info-visual {
    max-width: 280px;
    padding: 14px;
  }

  .pre-info-visual img {
    max-width: 160px;
  }

  .pre-info-visual-caption {
    margin: 10px -14px 0;
    font-size: 0.68rem;
  }

  .footer-locations {
    gap: 12px;
  }

  .site-footer {
    padding: 28px 0;
  }
}

/* ==================================================
   NÚT HỖ TRỢ CHUYỂN ĐỔI (v14)
   Back-to-top, floating contact buttons, popup đăng ký.
   Toàn bộ chỉ xử lý giao diện phía client — không gọi API.
   ================================================== */

/* Back to top */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 204px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--gradient-blue);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, box-shadow 0.15s ease;
  z-index: 60;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.back-to-top.is-near-form {
  opacity: 0.35;
}

/* Floating contact buttons */
.floating-contact {
  position: fixed;
  right: 20px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 55;
  transition: opacity 0.2s ease;
}

.floating-contact.is-near-form {
  opacity: 0.35;
}

.floating-contact__btn {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.floating-contact__btn:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: var(--shadow-soft);
}

.floating-contact__btn--fanpage,
.floating-contact__btn--messenger {
  background: var(--gradient-blue);
}

.floating-contact__btn--hotline {
  background: var(--gradient-cta);
}

.floating-contact__tooltip {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-navy);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

@media (hover: hover) {
  .floating-contact__btn:hover .floating-contact__tooltip {
    opacity: 1;
  }
}

@media (max-width: 640px) {
  .floating-contact {
    flex-direction: row;
    right: 12px;
    bottom: 12px;
    gap: 8px;
  }

  .floating-contact__btn {
    width: 44px;
    height: 44px;
  }

  .floating-contact__tooltip {
    display: none;
  }

  .back-to-top {
    right: 12px;
    bottom: 66px;
    width: 40px;
    height: 40px;
  }
}

/* Popup đăng ký tư vấn */
.lead-popup {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.lead-popup.is-open {
  display: flex;
}

.lead-popup__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(16, 35, 38, 0.45);
}

.lead-popup__card {
  position: relative;
  background: var(--color-white);
  border-radius: 24px;
  padding: 28px 24px 24px;
  max-width: 420px;
  width: calc(100% - 32px);
  box-shadow: var(--shadow-soft);
  text-align: center;
  animation: leadPopupIn 0.25s ease;
}

@keyframes leadPopupIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.lead-popup__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.lead-popup__card h3 {
  color: var(--color-navy);
  font-size: 1.25rem;
  margin-bottom: 10px;
  padding-right: 20px;
}

.lead-popup__card p {
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 20px;
}

.lead-popup__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lead-popup__cta {
  min-height: 48px;
}

.lead-popup__later {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 0.88rem;
  cursor: pointer;
  padding: 8px;
  min-height: 44px;
}

.lead-popup__later:hover {
  color: var(--color-navy);
}

@media (max-width: 480px) {
  .lead-popup__card {
    padding: 24px 20px 20px;
  }
}