/* =================================================================
   LỚP HỌC CẦU LÔNG Q4 & Q7 - Mobile-First Clean & Sporty Style
   Website: https://lophoccaulong.com
   Tối ưu hóa chuyên sâu cho điện thoại màn hình dọc (Portrait Mobile)
   ================================================================= */

/* --- Mobile Safe Areas & Base Resets --- */
:root {
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

*, *::before, *::after {
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Be Vietnam Pro', 'Inter', -apple-system, sans-serif;
  color: #0f172a;
  background-color: #ffffff;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Plus Jakarta Sans', 'Montserrat', sans-serif;
  letter-spacing: -0.02em;
}

/* Ngăn iOS Safari tự động phóng to (auto-zoom) khi chạm vào input */
input, select, textarea {
  font-size: 16px !important;
  touch-action: manipulation;
}

/* --- Custom Clean Scrollbar --- */
::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}
::-webkit-scrollbar-track {
  background: #f8fafc;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: #10b981;
}

/* --- Hide Scrollbar for Horizontal Scroll on Mobile --- */
.no-scrollbar::-webkit-scrollbar {
  display: none;
}
.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* --- Sporty Slant & Badge Accents --- */
.sport-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.7rem;
  padding: 0.3rem 0.75rem;
  border-radius: 9999px;
  white-space: nowrap;
}

/* --- Clean Elevated Cards --- */
.clean-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 1.15rem;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.clean-card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 10px 28px -6px rgba(15, 23, 42, 0.07);
  transform: translateY(-3px);
}

.clean-card-interactive {
  position: relative;
  overflow: hidden;
}

.clean-card-interactive::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #10b981, #059669);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.clean-card-interactive:hover::after {
  opacity: 1;
}

/* --- Touch-Optimized Buttons (Min 44px height for mobile thumbs) --- */
.btn-primary-sport {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #0f172a;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  min-height: 48px;
  padding: 0.75rem 1.35rem;
  border-radius: 0.85rem;
  transition: all 0.2s ease;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.1);
  touch-action: manipulation;
}

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

.btn-primary-sport:hover {
  background: #10b981;
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.25);
}

.btn-accent-sport {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #10b981;
  color: #ffffff;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  min-height: 48px;
  padding: 0.75rem 1.35rem;
  border-radius: 0.85rem;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.2);
  touch-action: manipulation;
}

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

.btn-accent-sport:hover {
  background: #059669;
  box-shadow: 0 6px 22px rgba(16, 185, 129, 0.3);
}

.btn-secondary-clean {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #ffffff;
  color: #0f172a;
  border: 1px solid #e2e8f0;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  min-height: 48px;
  padding: 0.75rem 1.25rem;
  border-radius: 0.85rem;
  transition: all 0.2s ease;
  touch-action: manipulation;
}

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

.btn-secondary-clean:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #059669;
}

/* --- Clean Navigation Bar --- */
#header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #f1f5f9;
  transition: all 0.25s ease;
}

#header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 14px rgba(15, 23, 42, 0.05);
  border-bottom: 1px solid #e2e8f0;
}

/* --- Step & Number Accents (Sporty 01, 02, 03) --- */
.stat-number {
  font-variant-numeric: tabular-nums;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.step-number {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 900;
  font-size: 1.85rem;
  line-height: 1;
  color: #e2e8f0;
  transition: color 0.2s ease;
}

.clean-card:hover .step-number {
  color: #10b981;
}

/* --- Segmented Control Tabs (Mobile Horizontal Scroll Friendly) --- */
.tab-pill {
  transition: all 0.2s ease;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 0.8125rem;
  padding: 0.55rem 1.1rem;
  border-radius: 9999px;
  color: #64748b;
  background: transparent;
  white-space: nowrap;
  touch-action: manipulation;
}

.tab-pill.active {
  color: #ffffff;
  background: #0f172a;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.15);
}

.tab-content {
  display: none;
  animation: tabFadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes tabFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- TikTok Vertical Cards (Clean Minimalist 9:16) --- */
.video-card-clean {
  position: relative;
  aspect-ratio: 9 / 16;
  border-radius: 1.15rem;
  overflow: hidden;
  background: #0f172a;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid #e2e8f0;
  touch-action: manipulation;
}

.video-card-clean:active {
  transform: scale(0.98);
}

.video-card-clean .poster-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card-clean .overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.25) 0%, rgba(15, 23, 42, 0.05) 40%, rgba(15, 23, 42, 0.92) 100%);
}

.video-card-clean .play-btn {
  transition: all 0.2s ease;
}

.video-card-clean:hover .play-btn {
  transform: scale(1.1);
  background: #10b981;
}

/* --- Clean Pricing Card --- */
.pricing-card-clean {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 1.25rem;
  transition: all 0.25s ease;
}

.pricing-card-clean.featured {
  border: 2px solid #10b981;
  box-shadow: 0 10px 24px rgba(16, 185, 129, 0.1);
}

/* --- Clean FAQ Accordion --- */
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-item.active .faq-answer {
  max-height: 600px;
}

.faq-chevron {
  transition: transform 0.25s ease;
}

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

/* --- Clean Toast Notification (Optimized for Mobile Bottom Placement) --- */
.toast {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9999;
  transform: translateY(-120%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 420px;
  width: calc(100% - 32px);
}

.toast.show {
  transform: translateY(0);
}

.toast-progress {
  height: 3px;
  background: #10b981;
  border-radius: 0 0 1rem 1rem;
  animation: toast-progress-anim 8s linear forwards;
}

@keyframes toast-progress-anim {
  from { width: 100%; }
  to { width: 0%; }
}

/* --- Floating Actions Speed-Dial (Tối ưu màn hình dọc) --- */
.floating-actions {
  position: fixed;
  bottom: calc(18px + var(--safe-bottom));
  right: 16px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}

.float-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.85rem;
  height: 2.85rem;
  border-radius: 9999px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.18);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  touch-action: manipulation;
}

.float-action-btn:active {
  transform: scale(0.94);
}

@keyframes soft-pulse-ring {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.35); opacity: 0; }
}

.float-action-phone::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 9999px;
  border: 2px solid #10b981;
  animation: soft-pulse-ring 2.2s infinite ease-out;
}

/* --- Quick Mobile Bottom Contact Bar (Khi cuộn trang trên điện thoại) --- */
.mobile-bottom-bar {
  display: none;
}

@media (max-width: 640px) {
  .mobile-bottom-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 85;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid #e2e8f0;
    padding: 0.65rem 1rem calc(0.65rem + var(--safe-bottom));
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.06);
    transition: transform 0.25s ease;
  }

  .mobile-bottom-bar.hidden-bar {
    transform: translateY(100%);
  }

  /* Khi có bottom bar, dời nút floating actions lên trên 1 chút để không bị che */
  .floating-actions {
    bottom: calc(72px + var(--safe-bottom));
    right: 12px;
  }

  /* Di chuyển vị trí hiển thị Toast xuống gần đáy màn hình điện thoại */
  .toast {
    top: auto;
    bottom: calc(76px + var(--safe-bottom));
    right: 12px;
    left: 12px;
    width: auto;
    transform: translateY(120%);
  }

  .toast.show {
    transform: translateY(0);
  }

  /* Tối ưu scroll-padding-top trên màn hình dọc */
  html {
    scroll-padding-top: 64px;
  }

  /* Padding các section trên mobile gọn gàng hơn */
  section {
    padding-top: 3.25rem !important;
    padding-bottom: 3.25rem !important;
  }

  #hero {
    padding-top: 5rem !important;
    padding-bottom: 2.75rem !important;
  }
}

/* --- Form Highlight Animation --- */
@keyframes form-clean-highlight {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
  50% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0.25); }
}

.form-highlight-pulse {
  animation: form-clean-highlight 1.5s ease-in-out 2;
}

/* --- Clean Video Modal --- */
.video-modal {
  display: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.video-modal.active {
  display: flex;
  opacity: 1;
}

/* --- Scroll Reveal Animations --- */
.scroll-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1), transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.06s; }
.reveal-delay-2 { transition-delay: 0.12s; }
.reveal-delay-3 { transition-delay: 0.18s; }
.reveal-delay-4 { transition-delay: 0.24s; }

/* --- Mobile Drawer --- */
.mobile-drawer {
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  padding-bottom: calc(1.5rem + var(--safe-bottom));
}

.mobile-drawer.open {
  transform: translateX(0);
}

.drawer-overlay {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.drawer-overlay.open {
  opacity: 1;
  pointer-events: all;
}

/* --- Achievement & Blog Specific Enhancements --- */
.medal-badge-gold {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
}

.medal-badge-silver {
  background: linear-gradient(135deg, #94A3B8, #64748B);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(100, 116, 139, 0.25);
}

.medal-badge-bronze {
  background: linear-gradient(135deg, #D97706, #B45309);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(217, 119, 6, 0.25);
}

.scrollbar-none::-webkit-scrollbar {
  display: none;
}
.scrollbar-none {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* --- Print styles --- */
@media print {
  .floating-actions,
  .mobile-bottom-bar,
  #header,
  .mobile-drawer,
  .drawer-overlay,
  .toast,
  .video-modal {
    display: none !important;
  }
}