/* ==========================================================
   HONOR Nahj Warranty Verification Portal - Light Theme (Default & Only)
   Design System: Clean Pearl White, Modern Tech Sapphire & Soft Shadows
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;500;600;700;800;900&family=Readex+Pro:wght@400;500;600;700;800&display=swap');

:root {
  --primary: #0066FF;
  --primary-hover: #0052CC;
  --primary-light: #EFF6FF;
  --primary-glow: rgba(0, 102, 255, 0.2);
  
  --accent: #00B4D8;
  --accent-light: #E0F7FA;
  
  --bg-page: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-input: #FFFFFF;
  
  --border-subtle: #E2E8F0;
  --border-medium: #CBD5E1;
  --border-bright: #93C5FD;
  --border-active: #0066FF;
  
  --text-main: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-dim: #94A3B8;
  
  --success: #059669;
  --success-bg: #ECFDF5;
  --success-border: #A7F3D0;
  --success-glow: rgba(16, 185, 129, 0.15);
  
  --warning: #D97706;
  --warning-bg: #FFFBEB;
  --warning-border: #FDE68A;
  --warning-glow: rgba(245, 158, 11, 0.15);
  
  --danger: #DC2626;
  --danger-bg: #FEF2F2;
  --danger-border: #FECACA;
  --danger-glow: rgba(239, 68, 68, 0.15);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --font-heading: 'Readex Pro', 'Cairo', sans-serif;
  --font-body: 'Cairo', 'Readex Pro', sans-serif;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 0 0 1px var(--border-subtle);
  --shadow-hover: 0 15px 35px -5px rgba(0, 102, 255, 0.1), 0 0 0 1px var(--border-bright);
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  height: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-page);
  color: var(--text-body);
  direction: rtl;
  text-align: right;
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 100% 0%, rgba(0, 102, 255, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 0% 50%, rgba(0, 180, 216, 0.04) 0%, transparent 35%),
    radial-gradient(circle at 50% 100%, rgba(0, 102, 255, 0.03) 0%, transparent 40%);
  background-attachment: fixed;
}

.main-content {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--primary-hover);
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Logos Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 84px;
}

.brand-logo-img {
  height: 40px;
  max-width: 180px;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  background: var(--primary-light);
}

/* Hero Section */
.hero-section {
  padding: 50px 0 35px;
  text-align: center;
}

.hero-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #0066FF 0%, #00B4D8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 32px;
  font-weight: 500;
}

/* Search Card */
.checker-card {
  max-width: 660px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: 0 12px 35px -5px rgba(0, 0, 0, 0.06), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
  transition: all 0.3s ease;
}

.checker-card:focus-within {
  border-color: var(--border-bright);
  box-shadow: 0 15px 40px -5px rgba(0, 102, 255, 0.12);
}

.input-box-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 6px 10px 6px 14px;
  transition: all 0.25s ease;
}

.input-box-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.imei-input-icon {
  color: var(--text-dim);
  display: flex;
  align-items: center;
  margin-left: 12px;
}

.imei-field {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  direction: rtl;
  text-align: right;
  letter-spacing: 0;
  padding: 0 4px;
}

.imei-field:not(:placeholder-shown) {
  direction: ltr;
  text-align: right;
  letter-spacing: 2px;
}

.imei-field::placeholder {
  color: var(--text-dim);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0;
  direction: rtl;
  text-align: right;
  unicode-bidi: embed;
}

.input-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.camera-scan-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-body);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.camera-scan-btn:hover {
  background: var(--primary-light);
  border-color: var(--border-bright);
  color: var(--primary);
}

.check-submit-btn {
  width: 100%;
  margin-top: 18px;
  background: linear-gradient(135deg, #0066FF 0%, #0088FF 100%);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-heading);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.25s ease;
  box-shadow: 0 8px 20px rgba(0, 102, 255, 0.25);
}

.check-submit-btn:hover {
  background: linear-gradient(135deg, #0052CC 0%, #0077EE 100%);
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(0, 102, 255, 0.35);
}

.check-submit-btn:active {
  transform: translateY(0);
}

.check-submit-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
}

.input-meta-info {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-top: 8px;
  padding: 0 4px;
  font-size: 12px;
  color: var(--text-dim);
}

.char-counter {
  font-family: monospace;
  font-weight: 700;
  direction: ltr;
}

.char-counter.valid {
  color: var(--success);
}

/* Result Box */
.result-section {
  max-width: 660px;
  margin: 24px auto 0;
  display: none;
  animation: slideUpFade 0.35s ease-out forwards;
}

@keyframes slideUpFade {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-box {
  border-radius: var(--radius-xl);
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.result-box.success {
  background: var(--success-bg);
  border: 2px solid var(--success-border);
}

.result-box.expired {
  background: var(--warning-bg);
  border: 2px solid var(--warning-border);
}

.result-box.danger {
  background: var(--danger-bg);
  border: 2px solid var(--danger-border);
}

.result-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.result-icon-badge {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.result-box.success .result-icon-badge {
  background: #FFFFFF;
  color: var(--success);
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.15);
}

.result-box.expired .result-icon-badge {
  background: #FFFFFF;
  color: var(--warning);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.15);
}

.result-box.danger .result-icon-badge {
  background: #FFFFFF;
  color: var(--danger);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.15);
}

.result-title-group h3 {
  font-size: 19px;
  margin-bottom: 4px;
}

.result-title-group p {
  font-size: 14px;
  color: var(--text-body);
}

.device-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  background: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 22px;
}

.spec-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.spec-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.spec-value {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-main);
}

.spec-value.highlight-green {
  color: var(--success);
}

.spec-value.highlight-amber {
  color: var(--warning);
}

.result-actions {
  display: flex;
  gap: 12px;
}

.btn-primary-action {
  flex: 1;
  background: var(--primary);
  border: none;
  color: #FFFFFF;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-secondary {
  flex: 1;
  background: #FFFFFF;
  border: 1px solid var(--border-medium);
  color: var(--text-main);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--text-muted);
}

/* Sections */
.section-title-wrap {
  text-align: center;
  margin-bottom: 36px;
}

.section-title {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 14.5px;
}

/* Guide Section */
.guide-section {
  padding: 60px 0 35px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

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

.guide-icon-circle {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.guide-step-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.guide-step-code {
  display: inline-block;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--primary);
  font-family: monospace;
  font-size: 15px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin: 8px 0;
  direction: ltr;
}

.guide-step-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* Maintenance Centers */
.centers-section {
  padding: 55px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.centers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 20px;
}

.center-card {
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.center-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.center-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.center-city {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-main);
}

.center-badge {
  font-size: 11px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.center-details-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.center-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-body);
}

.center-detail-item svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.center-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.center-actions-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.btn-center-call {
  background: var(--primary-light);
  border: 1px solid var(--border-bright);
  color: var(--primary);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-center-call:hover {
  background: var(--primary);
  color: #FFFFFF;
}

.btn-center-whatsapp {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-center-whatsapp:hover {
  background: var(--success);
  color: #FFFFFF;
}

.btn-center-map {
  background: #F8FAFC;
  border: 1px solid #CBD5E1;
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 12.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-center-map:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
}

/* Warranty Void Conditions (شروط الضمان) */
.terms-section {
  padding: 60px 0 40px;
}

.terms-card {
  max-width: 800px;
  margin: 0 auto;
  background: #FFFFFF;
  border: 2px solid #FEE2E2;
  border-radius: var(--radius-xl);
  padding: 32px 30px;
  box-shadow: 0 10px 30px -5px rgba(220, 38, 38, 0.06);
}

.terms-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.terms-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  background: var(--danger-bg);
  color: var(--danger);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.terms-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--danger);
}

.terms-subtitle {
  font-size: 14px;
  color: var(--text-body);
  font-weight: 600;
  margin-bottom: 16px;
}

.terms-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.terms-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #FFF5F5;
  border: 1px solid #FED7D7;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #7F1D1D;
}

.terms-item-num {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  background: var(--danger);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

/* FAQ Section */
.faq-section {
  padding: 50px 0 70px;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.faq-question {
  width: 100%;
  padding: 16px 20px;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-size: 15.5px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  text-align: right;
}

.faq-question:hover {
  background: var(--bg-subtle);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.75;
  display: none;
}

.faq-answer p {
  margin-bottom: 8px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer ul.faq-bullet-list {
  list-style: none;
  padding: 0;
  margin: 10px 0 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-answer ul.faq-bullet-list li {
  position: relative;
  padding-right: 20px;
  font-size: 13.5px;
  color: var(--text-body);
  line-height: 1.6;
}

.faq-answer ul.faq-bullet-list li::before {
  content: "•";
  position: absolute;
  right: 4px;
  top: -1px;
  color: var(--primary);
  font-size: 18px;
  font-weight: bold;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Reorder Buttons in Admin */
.btn-reorder {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: var(--radius-sm);
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  color: var(--text-body);
  font-weight: 800;
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  margin: 0 1px;
}

.btn-reorder:hover {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-chevron {
  transition: transform 0.25s ease;
  color: var(--primary);
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: #0F172A;
  color: #94A3B8;
  padding: 24px 0;
  font-size: 13px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  color: #94A3B8;
  font-size: 13px;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  text-align: center;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.scanner-modal {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 460px;
  padding: 24px;
  position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.scanner-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.close-modal-btn {
  background: var(--bg-subtle);
  border: none;
  color: var(--text-main);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

#scanner-reader {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
}

/* ==========================================================
   Comprehensive Mobile & Tablet Responsive Design
   ========================================================== */

/* Mobile Navigation Tabs (Hidden by default on Desktop) */
.mobile-tabs-wrapper {
  display: none;
}

/* Tablets & Laptops (max-width: 992px) */
@media (max-width: 992px) {
  .nav-links {
    gap: 10px;
  }
  .nav-links a {
    font-size: 13px;
    padding: 6px 10px;
  }
  .guide-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

/* Mobile & Medium Tablets (max-width: 860px) */
@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .nav-wrap {
    height: 68px;
    padding: 0 4px;
  }
  .brand-logo-img {
    height: 32px;
    max-width: 130px;
  }
  
  /* Mobile Segmented Control System (Modern Tech Style) */
  .mobile-tabs-wrapper {
    display: block;
    margin: 6px 0 12px;
    position: sticky;
    top: 60px;
    z-index: 30;
    background: rgba(248, 250, 252, 0.96);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 8px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }

  .mobile-tabs-track {
    display: flex;
    background: #E8EEF5;
    padding: 3.5px;
    border-radius: 12px;
    border: 1px solid #DCE4EE;
    gap: 3px;
  }

  .mobile-tab-btn {
    flex: 1 1 0;
    min-width: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 9px 4px;
    border-radius: 9px;
    font-size: 12.5px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    background: transparent;
    color: #64748B;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-tab-btn svg {
    flex-shrink: 0;
    opacity: 0.65;
    transition: all 0.2s ease;
  }

  .mobile-tab-btn.active {
    background: #FFFFFF;
    color: var(--primary);
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(11, 87, 208, 0.12), 0 1px 2px rgba(0, 0, 0, 0.04);
  }

  .mobile-tab-btn.active svg {
    opacity: 1;
    stroke: var(--primary);
  }

  .secondary-sections-wrapper > section {
    display: none;
    animation: mobileSectionFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .secondary-sections-wrapper > section.tab-active {
    display: block;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .device-specs-grid {
    grid-template-columns: 1fr;
  }
  .hero-section {
    padding: 36px 0 24px;
  }
  .hero-title {
    font-size: 26px;
    line-height: 1.3;
  }
  .hero-desc {
    font-size: 14.5px;
    margin-bottom: 24px;
    padding: 0 10px;
  }
  .checker-card {
    padding: 22px 16px;
    border-radius: var(--radius-lg);
  }
  .section-title {
    font-size: 22px;
  }
  .section-subtitle {
    font-size: 13.5px;
  }
  .centers-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .result-actions {
    flex-direction: column;
    gap: 10px;
  }
  .btn-primary-action, .btn-secondary {
    width: 100%;
  }
}

/* Mobile Smartphones (max-width: 540px) */
@media (max-width: 540px) {
  .container {
    padding: 0 14px;
  }
  .site-header {
    background: rgba(255, 255, 255, 0.96);
  }
  .nav-wrap {
    height: 60px;
  }
  .brand-logo-img {
    height: 27px;
    max-width: 110px;
  }
  
  .hero-section {
    padding: 28px 0 18px;
  }
  .hero-title {
    font-size: 23px;
    margin-bottom: 8px;
  }
  .hero-desc {
    font-size: 13.5px;
    margin-bottom: 20px;
    line-height: 1.6;
  }
  
  .checker-card {
    padding: 16px 12px;
    border-radius: var(--radius-lg);
    box-shadow: 0 6px 20px -2px rgba(0, 0, 0, 0.05);
  }
  
  .input-box-wrapper {
    padding: 5px 6px 5px 10px;
    border-radius: var(--radius-md);
  }
  
  .imei-field {
    font-size: 16px; /* Prevents auto-zoom in iOS Safari */
    padding: 0 2px;
  }
  
  .imei-field:not(:placeholder-shown) {
    letter-spacing: 1.5px;
    font-size: 18px;
  }
  
  .imei-field::placeholder {
    font-size: 13.5px;
  }
  
  .camera-scan-btn {
    padding: 8px 9px;
    font-size: 11.5px;
    gap: 4px;
    border-radius: var(--radius-sm);
  }
  
  .camera-scan-btn svg {
    width: 15px;
    height: 15px;
  }
  
  .check-submit-btn {
    margin-top: 14px;
    padding: 13px 18px;
    font-size: 15px;
    border-radius: var(--radius-md);
    min-height: 48px;
  }
  
  .result-section {
    margin-top: 18px;
  }
  
  .result-box {
    padding: 18px 14px;
    border-radius: var(--radius-lg);
  }
  
  .result-header {
    gap: 12px;
    margin-bottom: 14px;
    align-items: flex-start;
  }
  
  .result-icon-badge {
    width: 42px;
    height: 42px;
  }
  
  .result-icon-badge svg {
    width: 22px;
    height: 22px;
  }
  
  .result-title-group h3 {
    font-size: 15.5px;
    line-height: 1.4;
  }
  
  .result-title-group p {
    font-size: 12.5px;
    line-height: 1.5;
  }
  
  .device-specs-grid {
    padding: 12px 10px;
    margin-bottom: 14px;
  }
  
  .btn-primary-action, .btn-secondary {
    padding: 11px 14px;
    font-size: 13px;
    border-radius: var(--radius-sm);
    min-height: 44px;
  }
  
  .guide-section {
    padding: 35px 0 20px;
  }
  
  .guide-card {
    padding: 18px 14px;
  }
  
  .guide-icon-circle {
    width: 42px;
    height: 42px;
    margin-bottom: 10px;
  }
  
  .guide-step-title {
    font-size: 15px;
  }
  
  .guide-step-desc {
    font-size: 12.5px;
  }
  
  .centers-section {
    padding: 35px 0;
  }
  
  .center-card {
    padding: 16px 14px;
  }
  
  .center-city {
    font-size: 15.5px;
  }
  
  .center-details-list {
    gap: 8px;
    margin-bottom: 14px;
  }
  
  .center-detail-item {
    font-size: 12.5px;
  }
  
  .btn-center-call, .btn-center-whatsapp {
    padding: 9px 8px;
    font-size: 11.5px;
    min-height: 42px;
  }
  
  .btn-center-map {
    padding: 9px 10px;
    font-size: 12px;
    min-height: 42px;
  }
  
  .faq-section {
    padding: 35px 0 45px;
  }
  
  .faq-question {
    padding: 13px 14px;
    font-size: 14px;
  }
  
  .faq-answer {
    padding: 0 14px 14px;
    font-size: 12.5px;
    line-height: 1.65;
  }
  
  .site-footer {
    padding: 16px 12px;
    margin-top: auto;
  }
  
  .site-footer p {
    font-size: 12.5px !important;
    line-height: 1.6;
  }
  
  .scanner-modal {
    padding: 18px 14px;
    max-width: 94vw;
  }
}