/* ===========================
   ROOT VARIABLES
   =========================== */

:root {
  /* Colors — bảng màu "nhãn phuy hóa chất / chứng từ kỹ thuật" */
  --ink: #12221D;
  --steel-900: #14313A;
  --steel-700: #1D4A54;
  --teal-600: #0F8B80;
  --teal-500: #13A398;
  --teal-100: #E2F2EF;
  --amber-600: #C67E1E;
  --amber-500: #E3A038;
  --amber-100: #FBEAD0;
  --paper: #ECEFE6;
  --paper-white: #FAFAF6;
  --white: #FFFFFF;
  --line: #D5D9C9;
  --gray-600: #58665C;
  --gray-900: #16211B;
  --color-navy-900: #0f1c24;

  /* Typography */
  --font-display: 'Be Vietnam Pro', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Spacing / radius — bo góc nhỏ, cứng cáp hơn thay vì bo tròn mềm */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 10px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(18, 34, 29, 0.10);
  --shadow-md: 0 8px 24px rgba(18, 34, 29, 0.16);

  /* Transitions */
  --transition: 0.2s ease;

  /* Layout */
  --header-h: 68px;
}

/* ===========================
   GLOBAL STYLES
   =========================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--paper);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.5rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

h2 {
  font-size: 2rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 1.75rem;
  position: relative;
  padding-bottom: 1.1rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--teal-600);
}

h2::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 70px;
  width: 14px;
  height: 4px;
  background: var(--amber-500);
}

h3 {
  font-size: 1.4rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

p {
  color: var(--gray-600);
}

a {
  color: var(--teal-600);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--steel-700);
}

:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

/* ===========================
   LAYOUT & CONTAINER
   =========================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 0 2rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
  }
}

/* ===========================
   HEADER
   =========================== */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--steel-900);
  box-shadow: var(--shadow-md);
}

/* Dấu hiệu nhận diện: dải sọc cảnh báo — dùng đúng 1 lần ở đầu trang */
header::before {
  content: '';
  display: block;
  height: 5px;
  background: repeating-linear-gradient(
    135deg,
    var(--ink) 0 10px,
    var(--amber-500) 10px 20px
  );
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1rem;
}

@media (min-width: 640px) {
  .header-content {
    padding: 0.9rem 2rem;
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--white);
  font-size: 1.25rem;
  text-decoration: none;
}

.logo img {
  height: 42px;
  width: 42px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--white);
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  display: block;
}

@media (max-width: 399px) {
  .logo-text {
    display: none;
  }

  .logo {
    gap: 0;
  }
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--white);
  display: block;
  transition: background-color var(--transition);
}

.nav-toggle:hover span {
  background-color: var(--amber-500);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--steel-700);
  flex-direction: column;
  padding: 1rem;
  gap: 0;
}

nav.active {
  display: flex;
}

nav a {
  color: var(--white);
  padding: 0.85rem 0.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  transition: color var(--transition);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

nav a:last-child {
  border-bottom: none;
}

nav a:hover {
  color: var(--amber-500);
}

@media (min-width: 1024px) {
  nav {
    display: flex;
    position: static;
    background-color: transparent;
    flex-direction: row;
    gap: 2rem;
    padding: 0;
  }

  nav a {
    color: var(--white);
    border-bottom: none;
    padding: 0.25rem 0;
    position: relative;
  }

  nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background-color: var(--amber-500);
    transition: width var(--transition);
  }

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

  nav a:hover::after {
    width: 100%;
  }
}

/* ===========================
   HERO SECTION
   =========================== */

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(160deg, var(--steel-900) 0%, var(--steel-700) 100%);
}

.hero-banner {
  width: calc(100% - 2rem);
  max-width: 60%;
  height: auto;
  display: block;
  margin: 2.25rem auto 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 3px solid var(--paper-white);
  outline: 1px solid rgba(0, 0, 0, 0.15);
}

.hero-cta-strip {
  padding: 1.75rem 0 2.25rem;
  background-color: var(--steel-900);
  margin-top: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

@media (min-width: 1024px) {
  .hero-actions {
    gap: 1.5rem;
  }
}

/* ===========================
   BUTTONS
   =========================== */

.btn {
  display: inline-block;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--teal-600);
  color: var(--white);
  border-color: var(--teal-600);
}

.btn-primary:hover {
  background-color: var(--steel-700);
  border-color: var(--steel-700);
}

.btn-secondary {
  background-color: transparent;
  color: var(--white);
  border-color: var(--white);
}

.btn-secondary:hover {
  background-color: var(--white);
  color: var(--steel-900);
}

/* Buttons trên nền sáng (vd. banner xử lý nước thải) dùng viền teal */
.wastewater-highlight .btn-primary {
  background-color: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink);
}

.wastewater-highlight .btn-primary:hover {
  background-color: var(--amber-600);
  border-color: var(--amber-600);
}

/* ===========================
   SECTION STYLES
   =========================== */

.about {
  padding: 3.5rem 0;
  background-color: var(--paper-white);
}

.about-text {
  font-size: 1.0625rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 74ch;
  padding-left: 1.1rem;
  border-left: 3px solid var(--line);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal-600);
  padding: 1.75rem 1.25rem;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  font-family: var(--font-mono);
}

.products {
  padding: 3.5rem 0;
  background-color: var(--paper);
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--gray-600);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.wastewater-banner {
  padding: 2.5rem 0;
  background-color: var(--paper);
}

.contact-section {
  padding: 3.5rem 0;
  background-color: var(--paper-white);
}

/* ===========================
   SCROLL ANIMATIONS
   =========================== */

.fade-in-section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   PRODUCT SEARCH
   =========================== */

.product-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: 1.25rem;
  max-width: 100%;
}

@media (min-width: 640px) {
  .product-search-wrapper {
    max-width: 650px;
  }
}

#product-search {
  width: 100%;
  padding: 0.75rem 2.5rem 0.75rem 2.5rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  transition: border-color var(--transition), box-shadow var(--transition);
}

#product-search:focus {
  outline: none;
  border-color: var(--teal-600);
  box-shadow: 0 0 0 3px rgba(15, 139, 128, 0.14);
}

#product-search::placeholder {
  color: var(--gray-600);
  opacity: 0.7;
}

.product-search-wrapper::before {
  content: '🔍';
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9rem;
  z-index: 1;
  pointer-events: none;
  line-height: 1;
}

.search-clear-btn {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--gray-600);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
  display: none;
  line-height: 1;
  z-index: 1;
}

.search-clear-btn:hover {
  color: var(--ink);
  background-color: var(--teal-100);
}

.search-clear-btn.visible {
  display: inline-block;
}

/* ===========================
   PRODUCT RESULT COUNT
   =========================== */

.product-result-count {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--gray-600);
  margin-bottom: 0.75rem;
  padding: 0.4rem 0.75rem;
  background-color: var(--teal-100);
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* ===========================
   CATEGORY TABS / FILTERS
   =========================== */

#category-tabs {
  counter-reset: category-count;
}

.category-filter {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding: 0.5rem 0 2rem;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.category-filter::-webkit-scrollbar {
  height: 4px;
}

.category-filter::-webkit-scrollbar-track {
  background: var(--line);
}

.category-filter::-webkit-scrollbar-thumb {
  background: var(--teal-600);
  border-radius: 2px;
}

.category-filter::-webkit-scrollbar-thumb:hover {
  background: var(--steel-700);
}

@media (min-width: 1024px) {
  .category-filter {
    display: flex;
    flex-wrap: wrap;
    overflow-x: visible;
    gap: 0.75rem;
  }

  .category-pill {
    flex-shrink: 1;
  }
}

.category-pill {
  padding: 0.6rem 1.1rem 0.6rem 3.1rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--teal-600);
  background-color: var(--paper-white);
  color: var(--steel-900);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
  position: relative;
  counter-increment: category-count;
}

.category-pill::before {
  content: "SP." counter(category-count, decimal-leading-zero);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--teal-600);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

.category-pill:hover {
  background-color: var(--teal-100);
  border-color: var(--teal-600);
}

.category-pill.active {
  background-color: var(--steel-900);
  color: var(--white);
  border-color: var(--steel-900);
}

.category-pill.active::before {
  color: var(--amber-500);
}

.tab-highlight {
  border-color: var(--amber-500);
}

.tab-highlight::before {
  color: var(--amber-600);
}

.tab-highlight.active {
  background-color: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink);
}

.tab-highlight.active::before {
  color: var(--ink);
}

/* ===========================
   PRODUCT TABLE
   =========================== */

.table-wrapper {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 70vh;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  box-shadow: var(--shadow-sm);
  background-color: var(--paper-white);
  margin: 1.5rem 0;
}

.table-wrapper.table-highlight {
  border-top-color: var(--amber-500);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background-color: var(--steel-900);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

th {
  padding: 0.9rem 1rem;
  text-align: left;
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: none;
  border-bottom: 2px solid var(--amber-500);
}

td {
  padding: 0.9rem 1rem;
  border: none;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.chem-name-hoverable {
  text-decoration: underline dotted var(--teal-600);
  cursor: help;
  outline: none;
  display: inline-block;
}

.chem-name-hoverable:focus {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

#global-chem-tooltip {
  position: fixed;
  width: 240px;
  background-color: var(--color-navy-900);
  color: var(--white);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 0.85rem;
  z-index: 9999;
  white-space: normal;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.1s ease, visibility 0.1s ease;
  text-align: left;
  left: -9999px;
  top: -9999px;
}

#global-chem-tooltip img {
  width: calc(100% + 1.5rem);
  height: 120px;
  object-fit: cover;
  display: block;
  margin: -0.75rem -0.75rem 0.6rem -0.75rem;
  border-top-left-radius: var(--radius-md);
  border-top-right-radius: var(--radius-md);
}

#global-chem-tooltip .tooltip-usage {
  margin: 0 0 0.4rem 0;
  color: var(--white);
  line-height: 1.4;
}

#global-chem-tooltip .tooltip-safety {
  margin: 0 0 0.4rem 0;
  color: var(--amber-500);
  font-weight: 500;
  line-height: 1.4;
}

#global-chem-tooltip .tooltip-note {
  margin: 0;
  font-size: 0.72rem;
  color: var(--line);
  font-style: italic;
  line-height: 1.3;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 0.4rem;
  margin-top: 0.4rem;
}

#global-chem-tooltip.tooltip-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  left: auto;
  top: auto;
}

/* Override: force-hide all tooltips while page/table is scrolling. */
.scrolling #global-chem-tooltip {
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

td:nth-child(3) {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--teal-600);
  font-weight: 500;
}

tbody tr {
  transition: background-color var(--transition);
}

tbody tr:nth-child(even) {
  background-color: var(--paper);
}

tbody tr:hover {
  background-color: var(--teal-100);
}

tbody td {
  font-size: 0.92rem;
  color: var(--gray-900);
}

@media (max-width: 640px) {

  th,
  td {
    padding: 0.7rem 0.75rem;
    font-size: 0.85rem;
  }
}

/* ===========================
   WASTEWATER HIGHLIGHT SECTION
   =========================== */

.wastewater-highlight {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, var(--steel-900) 0%, var(--steel-700) 65%, var(--teal-600) 140%);
  border-left: 5px solid var(--amber-500);
  padding: 2.5rem;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.wastewater-highlight::after {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 130px;
  height: 130px;
  background: rgba(227, 160, 56, 0.14);
  transform: rotate(45deg);
}

.wastewater-highlight h3 {
  color: var(--white);
  margin-bottom: 0.75rem;
  position: relative;
}

.wastewater-highlight p {
  color: var(--paper);
  margin-bottom: 1.5rem;
  max-width: 62ch;
  position: relative;
}

.wastewater-badge {
  display: inline-block;
  background-color: var(--amber-500);
  color: var(--ink);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
}

/* ===========================
   CONTACT SECTION
   =========================== */

.contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin: 2.5rem 0;
  background-color: var(--paper-white);
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

@media (min-width: 1024px) {
  .contact {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info h3 {
  color: var(--ink);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--line);
}

.contact-info-item {
  margin-bottom: 1.4rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.contact-info-item .contact-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--teal-100);
  border-radius: var(--radius-sm);
  color: var(--teal-600);
  margin-top: 2px;
}

.contact-info-item .contact-icon svg {
  width: 18px;
  height: 18px;
}

.contact-info-item .contact-icon-wrap {
  flex-shrink: 0;
}

.contact-info-item .contact-text-wrap {
  flex: 1;
  min-width: 0;
}

.contact-info-item strong {
  color: var(--steel-900);
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
}

.contact-info-item p {
  color: var(--gray-600);
  margin: 0;
}

.contact-form h3 {
  color: var(--ink);
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--line);
}

.form-group {
  margin-bottom: 1.4rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--steel-900);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  background-color: var(--paper-white);
  color: var(--ink);
  cursor: pointer;
  transition: border-color var(--transition);
}

.form-group select:hover {
  border-color: var(--teal-600);
}

.form-group select:focus {
  outline: none;
  border-color: var(--teal-600);
  box-shadow: 0 0 0 3px rgba(15, 139, 128, 0.14);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--teal-600);
  box-shadow: 0 0 0 3px rgba(15, 139, 128, 0.14);
}

/* ===========================
   CONSENT CHECKBOX STYLES
   =========================== */

.consent-group {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.consent-checkbox-wrapper {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.consent-checkbox-wrapper input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  min-width: 1.25rem;
  margin-top: 0.15rem;
  cursor: pointer;
  accent-color: var(--teal-600);
}

.consent-checkbox-wrapper label {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--gray-900);
  cursor: pointer;
  font-family: var(--font-body);
  text-transform: none;
  letter-spacing: normal;
}

.consent-checkbox-wrapper label a {
  color: var(--teal-600);
  text-decoration: underline;
  font-weight: 500;
}

.consent-checkbox-wrapper label a:hover {
  color: var(--steel-700);
}

.consent-error {
  display: block;
  color: #dc2626;
  font-size: 0.9rem;
  margin-top: 0.5rem;
  margin-left: 2rem;
  font-family: var(--font-body);
}

.consent-error:empty {
  display: none;
}

/* ===========================
   FORM SUBMIT SPINNER & FEEDBACK
   =========================== */

#form-submit-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-width: 160px;
}

#form-submit-btn.loading .btn-text {
  visibility: hidden;
}

#form-submit-btn.loading .btn-spinner {
  display: flex !important;
  position: absolute;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner-icon {
  animation: spin 0.7s linear infinite;
}

.form-feedback {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

.form-feedback.success {
  background-color: var(--teal-100);
  color: var(--teal-600);
  border: 1px solid var(--teal-600);
}

.form-feedback.error {
  background-color: #fde8e8;
  color: #b91c1c;
  border: 1px solid #fca5a5;
}

/* ===========================
   BACK TO TOP BUTTON
   =========================== */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--teal-600);
  color: var(--white);
  border: 2px solid var(--teal-600);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background-color var(--transition);
  box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
  background-color: var(--steel-700);
  border-color: var(--steel-700);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

/* ===========================
   FOOTER
   =========================== */

footer {
  background-color: var(--steel-900);
  color: var(--line);
  padding: 2.25rem 1rem 0;
  margin-top: 4rem;
  position: relative;
}

/* Cùng mô-típ sọc cảnh báo với header — chỉ dùng lặp lại ở đây để đóng khung trang */
footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: repeating-linear-gradient(
    135deg,
    var(--amber-500) 0 10px,
    var(--ink) 10px 20px
  );
}

@media (min-width: 640px) {
  footer {
    padding: 2.25rem 2rem 0;
  }
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 1.5rem;
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr;
  }
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.75rem;
}

.footer-section a {
  color: var(--line);
  transition: color var(--transition);
}

.footer-section a:hover {
  color: var(--amber-500);
}

.footer-logo img {
  height: 56px;
  width: 56px;
  object-fit: contain;
  margin-bottom: 1rem;
  border-radius: var(--radius-sm);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem 0;
  margin-top: 2rem;
  text-align: center;
  color: var(--gray-600);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ===========================
   REDUCED MOTION SUPPORT
   =========================== */

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===========================
   UTILITIES
   =========================== */

.text-center {
  text-align: center;
}

.text-white {
  color: var(--white);
}

.text-gray-600 {
  color: var(--gray-600);
}

.bg-navy {
  background-color: var(--steel-900);
}

.bg-teal-light {
  background-color: var(--teal-100);
}

.rounded-md {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.shadow-sm {
  box-shadow: var(--shadow-sm);
}

.shadow-md {
  box-shadow: var(--shadow-md);
}

.mt-1 {
  margin-top: 0.5rem;
}

.mt-2 {
  margin-top: 1rem;
}

.mt-3 {
  margin-top: 1.5rem;
}

.mt-4 {
  margin-top: 2rem;
}

.mb-1 {
  margin-bottom: 0.5rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.mb-3 {
  margin-bottom: 1.5rem;
}

.mb-4 {
  margin-bottom: 2rem;
}

.py-2 {
  padding: 1rem 0;
}

.py-4 {
  padding: 2rem 0;
}

.gap-2 {
  gap: 1rem;
}

.gap-4 {
  gap: 2rem;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}