/* =====================================================
   THẦY STEVEN NGUYEN – GIA SƯ | style.css – Project 2
   Design: Warm gradient hero, card-heavy, bold typography
   ===================================================== */

/* ── 1. RESET & VARIABLES ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --mint:       #34d399;
  --mint-d:     #059669;
  --mint-l:     #d1fae5;
  --blue:       #60a5fa;
  --blue-d:     #2563eb;
  --amber:      #f59e0b;
  --amber-d:    #d97706;
  --white:      #ffffff;
  --off-white:  #f9fafb;
  --g100:       #f3f4f6;
  --g200:       #e5e7eb;
  --g400:       #9ca3af;
  --g600:       #4b5563;
  --g700:       #374151;
  --g900:       #111827;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow-sm:  0 2px 8px rgba(0,0,0,.07);
  --shadow-md:  0 6px 20px rgba(0,0,0,.1);
  --shadow-lg:  0 16px 48px rgba(0,0,0,.14);
  --t:          .25s ease;
}

html { scroll-behavior: smooth; }
body { font-family: 'Inter', sans-serif; color: var(--g700); background: #fff; overflow-x: hidden; }
h1,h2,h3,h4 { font-family: 'Montserrat', sans-serif; color: var(--g900); line-height: 1.2; }
a { text-decoration: none; color: inherit; transition: color var(--t); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.section-pad { padding: 90px 0; }
.bg-light { background: var(--off-white); }

/* ── 2. SECTION LABELS ── */
.section-label {
  display: inline-block;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mint-d);
  background: rgba(52,211,153,.12);
  border: 1px solid rgba(52,211,153,.25);
  padding: 5px 14px;
  border-radius: 50px;
  margin-bottom: 14px;
}
.section-header-center { text-align: center; margin-bottom: 56px; }
.s-title {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 14px;
}
.s-desc { font-size: 1rem; color: var(--g600); max-width: 580px; margin: 0 auto; line-height: 1.75; }
.hi { color: var(--mint-d); }

/* ── 3. BUTTONS ── */
.btn-green {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: .95rem;
  padding: 13px 28px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(52,211,153,.35);
  transition: all var(--t);
}
.btn-green:hover { transform: translateY(-2px); box-shadow: 0 8px 26px rgba(52,211,153,.45); }
.btn-lg-custom { padding: 16px 36px; font-size: 1.05rem; }

/* ── 4. TOPBAR ── */
.topbar {
  background: var(--g900);
  padding: 9px 0;
  font-size: .8rem;
  color: rgba(255,255,255,.65);
}
.topbar-inner {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}
.topbar-inner span { display: flex; align-items: center; gap: 7px; }
.topbar-inner i { color: var(--mint); }
.topbar-inner a { color: rgba(255,255,255,.75); }
.topbar-inner a:hover { color: var(--mint); }

/* ── 5. NAVBAR ── */
.navbar {
  position: fixed;
  top: 36px; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: all var(--t);
}
.navbar.scrolled { top: 0; border-bottom-color: var(--g200); box-shadow: var(--shadow-sm); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.1rem;
}
.logo-text { display: flex; flex-direction: column; }
.logo-title { font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 1rem; color: var(--g900); line-height: 1.1; }
.logo-sub { font-size: .72rem; color: var(--g400); }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a { font-size: .88rem; font-weight: 500; color: var(--g600); padding: 8px 12px; border-radius: 8px; }
.nav-links a:not(.btn-cta):hover { color: var(--mint-d); background: rgba(52,211,153,.08); }

.btn-cta {
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff !important;
  padding: 10px 20px;
  border-radius: 50px;
  font-size: .85rem;
  font-weight: 600;
  display: flex; align-items: center; gap: 7px;
  box-shadow: 0 3px 12px rgba(52,211,153,.3);
}
.btn-cta:hover { box-shadow: 0 6px 20px rgba(52,211,153,.4); transform: translateY(-1px); }

.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--g700); border-radius: 2px; transition: all var(--t); }

/* ── 6. HERO ── */
.hero {
  background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  padding: 130px 0 0;
  overflow: hidden;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding-bottom: 60px;
}

.trust-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.trust-item { display: flex; align-items: center; gap: 6px; font-size: .8rem; color: rgba(255,255,255,.75); font-weight: 500; }
.trust-item i { color: var(--amber); }
.trust-sep { width: 1px; height: 16px; background: rgba(255,255,255,.2); }

h1 { color: #fff; }
.title-pre { display: block; font-size: clamp(.9rem, 1.8vw, 1.05rem); font-weight: 400; color: var(--mint); letter-spacing: .08em; text-transform: uppercase; margin-bottom: 10px; font-family: 'Montserrat', sans-serif; }
.title-big { display: block; font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 900; line-height: 1.05; }
.title-big em { font-style: normal; color: var(--mint); }

.hero-desc { color: rgba(255,255,255,.7); font-size: 1.05rem; line-height: 1.8; margin: 20px 0 26px; }

.hero-bullets { margin-bottom: 32px; }
.bullet { display: flex; align-items: center; gap: 12px; font-size: .95rem; color: rgba(255,255,255,.8); margin-bottom: 10px; }
.bullet-dot {
  width: 8px; height: 8px;
  background: var(--mint);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(52,211,153,.2);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 24px; }

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  padding: 15px 30px;
  border-radius: 50px;
  box-shadow: 0 6px 24px rgba(52,211,153,.4);
  transition: all var(--t);
}
.btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(52,211,153,.52); }

.btn-hero-zalo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: rgba(255,255,255,.1);
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: .95rem;
  padding: 15px 26px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,.2);
  transition: all var(--t);
}
.btn-hero-zalo:hover { background: rgba(255,255,255,.18); }

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .83rem;
  color: rgba(255,255,255,.55);
}
.hero-guarantee i { color: var(--mint); }

/* Hero photo */
.hero-right { display: flex; justify-content: center; }
.hero-photo-wrap { position: relative; width: 440px; max-width: 100%; }
.photo-ring {
  width: 380px; height: 380px;
  border-radius: 50%;
  border: 4px solid rgba(52,211,153,.35);
  padding: 8px;
  margin: 0 auto;
  background: rgba(255,255,255,.05);
  box-shadow: 0 0 60px rgba(52,211,153,.12);
}
.hero-avatar {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
}

.float-card {
  position: absolute;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.float-card i { font-size: 1.4rem; }
.float-card strong { display: block; font-size: 1.05rem; font-family: 'Montserrat', sans-serif; font-weight: 800; line-height: 1; }
.float-card small { font-size: .72rem; opacity: .75; }
.fc-top { top: 10px; right: -10px; }
.fc-right { bottom: 100px; right: -20px; }
.fc-bottom { bottom: 20px; left: 0; }

.hero-wave { line-height: 0; }
.hero-wave svg { width: 100%; height: 80px; }

/* ── 7. STATS ── */
.stats-section { background: var(--off-white); padding: 36px 0; }
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-box {
  display: flex;
  align-items: center;
  gap: 14px;
  background: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--g100);
}
.stat-icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.stat-body b {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--g900);
  line-height: 1;
}
.stat-body p { font-size: .78rem; color: var(--g400); margin-top: 4px; }

/* ── 8. ABOUT ── */
.about-wrap {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 70px;
  align-items: center;
}
.about-photo-frame { position: relative; }
.about-img { width: 100%; border-radius: var(--radius-lg); height: 500px; object-fit: cover; box-shadow: var(--shadow-lg); }
.about-overlay-card {
  position: absolute;
  bottom: -14px; right: -14px;
  background: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-md);
  min-width: 240px;
}
.oc-item { display: flex; align-items: center; gap: 10px; font-size: .84rem; color: var(--g700); padding: 5px 0; }
.oc-item i { color: var(--mint-d); width: 18px; }

.about-text p { font-size: .98rem; line-height: 1.82; color: var(--g600); margin-bottom: 16px; }
.about-text em { color: var(--mint-d); font-style: italic; font-weight: 500; }

.about-badges { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
.abadge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--mint-l);
  color: var(--mint-d);
  font-size: .82rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 50px;
}
.abadge i { font-size: .9rem; }

/* ── 9. RESULTS ── */
.results { background: var(--g900); }
.results .section-label { background: rgba(52,211,153,.15); color: var(--mint); }
.results .s-title { color: #fff; }
.results .s-desc { color: rgba(255,255,255,.55); }

.results-masonry {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: auto;
  gap: 20px;
  margin-bottom: 48px;
}

.rc {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--t);
  backdrop-filter: blur(4px);
}
.rc:hover { background: rgba(255,255,255,.1); transform: translateY(-4px); }
.large-card { grid-column: span 1; }
.rc-img { margin: -24px -24px 20px; border-radius: var(--radius-lg) var(--radius-lg) 0 0; overflow: hidden; }
.rc-img img { width: 100%; height: 180px; object-fit: cover; transition: transform .4s ease; }
.rc:hover .rc-img img { transform: scale(1.04); }

.rc-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  color: var(--mint);
  background: rgba(52,211,153,.15);
  border: 1px solid rgba(52,211,153,.3);
  padding: 3px 10px;
  border-radius: 50px;
  margin-bottom: 14px;
  letter-spacing: .04em;
}
.rc-score { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.sc-box {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.6rem;
  font-weight: 900;
  padding: 4px 12px;
  border-radius: 8px;
}
.sc-box.before { background: rgba(239,68,68,.15); color: #ef4444; }
.sc-box.after  { background: rgba(52,211,153,.15); color: var(--mint); }
.sc-arrow { display: flex; flex-direction: column; align-items: center; color: rgba(255,255,255,.4); font-size: .9rem; }
.sc-arrow small { font-size: .7rem; margin-top: 2px; }

.rc h4 { font-size: .95rem; color: #fff; margin-bottom: 8px; }
.rc p { font-size: .84rem; color: rgba(255,255,255,.55); line-height: 1.7; font-style: italic; }

.results-bottom { text-align: center; }
.results-bottom p { font-size: 1.1rem; color: rgba(255,255,255,.7); margin-bottom: 20px; }

/* ── 10. SUBJECTS ── */
.sub-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.sub-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
  transition: all var(--t);
  position: relative;
  overflow: hidden;
}
.sub-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-clr, var(--mint));
  border-radius: 3px 3px 0 0;
}
.sub-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--g100); }

.sub-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--card-clr, var(--mint));
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  margin: 0 auto 16px;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--card-clr,#34d399) 30%, transparent);
}
.sub-card h4 { font-size: .95rem; margin-bottom: 8px; }
.sub-card p { font-size: .81rem; color: var(--g600); line-height: 1.65; margin-bottom: 14px; }
.sub-level {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 50px;
  background: color-mix(in srgb, var(--card-clr,#34d399) 12%, transparent);
  color: var(--card-clr, var(--mint-d));
}

/* ── 11. METHOD ── */
.method { background: #fff; }
.method-wrap {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 70px;
  align-items: center;
}
.method-img img { width: 100%; border-radius: var(--radius-lg); height: 520px; object-fit: cover; box-shadow: var(--shadow-lg); }
.method-list { display: flex; flex-direction: column; gap: 0; }
.mitem {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--g100);
  transition: all var(--t);
}
.mitem:last-child { border-bottom: none; }
.mitem:hover { padding-left: 8px; }
.mi-num {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--g100);
  line-height: 1;
  min-width: 36px;
  margin-top: 6px;
}
.mi-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1rem;
  flex-shrink: 0;
}
.mi-body h4 { font-size: .95rem; margin-bottom: 6px; }
.mi-body p { font-size: .85rem; color: var(--g600); line-height: 1.7; }

/* ── 12. TESTIMONIALS ── */
.testi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.tc {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--g100);
  transition: all var(--t);
}
.tc:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.featured-tc {
  background: linear-gradient(135deg, var(--mint-d), #0d9488);
  border-color: transparent;
  color: #fff;
}
.featured-tc .tc-stars { color: var(--amber); }
.featured-tc p { color: rgba(255,255,255,.85); }
.featured-tc .tc-author strong { color: #fff; }
.featured-tc .tc-author span { color: rgba(255,255,255,.6); }

.tc-stars { color: var(--amber); font-size: .95rem; letter-spacing: 1px; margin-bottom: 14px; }
.tc p { font-size: .87rem; color: var(--g600); line-height: 1.75; font-style: italic; margin-bottom: 18px; }
.tc-author { display: flex; align-items: center; gap: 12px; }
.tc-author img { width: 46px; height: 46px; border-radius: 50%; object-fit: cover; border: 2px solid var(--mint); }
.tc-author strong { display: block; font-size: .88rem; color: var(--g900); }
.tc-author span { font-size: .75rem; color: var(--g400); }

/* ── 13. PRICING ── */
.pricing { background: var(--off-white); }
.price-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-bottom: 32px; }
.pc {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 2px solid var(--g100);
  box-shadow: var(--shadow-sm);
  transition: all var(--t);
  position: relative;
}
.pc:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.pc-hot {
  border-color: var(--mint);
  background: #fff;
  box-shadow: 0 8px 32px rgba(52,211,153,.12);
}
.pc-badge {
  position: absolute;
  top: -13px; left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--amber), var(--amber-d));
  color: #fff;
  font-size: .73rem;
  font-weight: 700;
  padding: 5px 16px;
  border-radius: 50px;
  white-space: nowrap;
  letter-spacing: .06em;
  box-shadow: 0 4px 14px rgba(245,158,11,.3);
}
.pc-top { text-align: center; margin-bottom: 20px; }
.pc-icon {
  width: 58px; height: 58px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.3rem;
  margin: 0 auto 14px;
}
.pc-top h3 { font-size: 1.2rem; margin-bottom: 6px; }
.pc-top p { font-size: .82rem; color: var(--g400); }
.pc-price { text-align: center; padding: 14px 0; border-top: 1px solid var(--g100); border-bottom: 1px solid var(--g100); margin-bottom: 20px; }
.pc-price span { font-family: 'Montserrat', sans-serif; font-size: 1.9rem; font-weight: 800; color: var(--mint-d); display: block; }
.pc-price small { font-size: .8rem; color: var(--g400); margin-top: 4px; display: block; }
.pc ul { margin-bottom: 24px; }
.pc ul li { display: flex; align-items: center; gap: 9px; font-size: .86rem; color: var(--g600); padding: 7px 0; border-bottom: 1px solid var(--g100); }
.pc ul li:last-child { border-bottom: none; }
.pc ul li i { color: var(--mint-d); }
.pc-btn {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: 50px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: .9rem;
  border: 2px solid var(--g200);
  color: var(--g700);
  transition: all var(--t);
}
.pc-btn:hover { border-color: var(--mint); color: var(--mint-d); background: rgba(52,211,153,.06); }
.pc-btn-hot {
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(52,211,153,.35);
}
.pc-btn-hot:hover { box-shadow: 0 8px 24px rgba(52,211,153,.48); border-color: transparent; color: #fff; background: linear-gradient(135deg, var(--mint), var(--mint-d)); }

.free-trial-banner {
  background: linear-gradient(135deg, var(--g900), #1e3a5f);
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  display: flex;
  align-items: center;
  gap: 20px;
  color: #fff;
}
.ftb-icon {
  width: 54px; height: 54px;
  background: rgba(245,158,11,.2);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: var(--amber);
  font-size: 1.4rem;
  flex-shrink: 0;
}
.free-trial-banner strong { font-size: 1.05rem; font-family: 'Montserrat', sans-serif; display: block; margin-bottom: 4px; }
.free-trial-banner p { font-size: .84rem; color: rgba(255,255,255,.6); }
.ftb-btn {
  margin-left: auto;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: .9rem;
  padding: 12px 24px;
  border-radius: 50px;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(52,211,153,.35);
  transition: all var(--t);
}
.ftb-btn:hover { box-shadow: 0 8px 24px rgba(52,211,153,.48); transform: translateY(-1px); }

/* ── 14. HOW IT WORKS ── */
.steps-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: start;
}
.step { text-align: center; }
.step-circle {
  position: relative;
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--mint,#34d399), var(--mint-d,#059669));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 6px 22px rgba(52,211,153,.3);
  overflow: hidden;
}
.step-circle span {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: rgba(255,255,255,.2);
  position: absolute;
}
.step-icon-wrap {
  font-size: 1.2rem;
  color: #fff;
  position: relative;
  z-index: 1;
}
.step-line {
  display: none; /* visible via pseudo-element logic */
}
.step h4 { font-size: 1rem; margin-bottom: 10px; }
.step p { font-size: .84rem; color: var(--g600); line-height: 1.7; }

/* ── 15. CONTACT ── */
.contact { background: linear-gradient(135deg, #ecfdf5 0%, #eff6ff 100%); }
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 60px;
  align-items: start;
}
.contact-left p { font-size: 1rem; color: var(--g600); line-height: 1.75; margin-bottom: 28px; }
.c-contacts { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.c-contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 18px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--g100);
  transition: all var(--t);
}
.c-contact-item:hover { border-color: var(--mint); transform: translateX(4px); }
.cci-icon {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1rem;
  flex-shrink: 0;
}
.cci-zalo { background: linear-gradient(135deg, #0068ff, #004dd1); }
.cci-fb { background: linear-gradient(135deg, #1877f2, #0d5bbf); }
.c-contact-item strong { display: block; font-size: .9rem; color: var(--g900); }
.c-contact-item span { font-size: .8rem; color: var(--g400); }
.c-side-img { width: 100%; border-radius: var(--radius-lg); height: 200px; object-fit: cover; box-shadow: var(--shadow-md); margin-top: 4px; }

/* Contact Form */
.contact-right {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--g100);
}
.cf-header { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.cf-header i { font-size: 1.4rem; color: var(--mint-d); }
.cf-header h3 { font-size: 1.15rem; }

.cf-group { margin-bottom: 18px; }
.cf-group label { display: block; font-size: .86rem; font-weight: 600; color: var(--g700); margin-bottom: 7px; }
.req { color: #ef4444; }
.cf-group input,
.cf-group select,
.cf-group textarea {
  width: 100%;
  padding: 11px 15px;
  border: 1.5px solid var(--g200);
  border-radius: 10px;
  font-family: 'Inter', sans-serif;
  font-size: .92rem;
  color: var(--g700);
  background: #fff;
  outline: none;
  transition: border-color var(--t), box-shadow var(--t);
  resize: vertical;
}
.cf-group input:focus,
.cf-group select:focus,
.cf-group textarea:focus { border-color: var(--mint); box-shadow: 0 0 0 3px rgba(52,211,153,.14); }
.cf-group input.error, .cf-group select.error { border-color: #ef4444; }
.cf-err { font-size: .76rem; color: #ef4444; display: block; margin-top: 5px; }

.cf-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--mint), var(--mint-d));
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: .98rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 9px;
  box-shadow: 0 4px 18px rgba(52,211,153,.35);
  transition: all var(--t);
}
.cf-submit:hover { box-shadow: 0 8px 26px rgba(52,211,153,.48); transform: translateY(-1px); }
.cf-submit:disabled { opacity: .65; cursor: not-allowed; transform: none; }

.cf-note {
  text-align: center;
  font-size: .76rem;
  color: var(--g400);
  margin-top: 12px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
}
.cf-success { text-align: center; padding: 24px 10px; }
.cfs-icon { font-size: 3.5rem; color: var(--mint-d); margin-bottom: 14px; }
.cf-success h3 { margin-bottom: 10px; }
.cf-success p { color: var(--g600); line-height: 1.7; margin-bottom: 22px; }

/* ── 16. FOOTER ── */
.footer { background: #0f172a; }
.footer-top { padding: 60px 0 50px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 50px;
}
.fg-brand p { font-size: .86rem; color: rgba(255,255,255,.5); line-height: 1.75; margin: 14px 0 22px; }
.f-social { display: flex; gap: 10px; }
.f-social a {
  width: 38px; height: 38px;
  background: rgba(255,255,255,.08);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.55);
  font-size: .9rem;
  transition: all var(--t);
}
.f-social a:hover { background: var(--mint-d); color: #fff; }
.fg-links h5, .fg-contact h5 { font-size: .82rem; color: #fff; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 16px; }
.fg-links a { display: block; font-size: .84rem; color: rgba(255,255,255,.5); padding: 5px 0; }
.fg-links a:hover { color: var(--mint); }
.fg-contact p { display: flex; align-items: center; gap: 10px; font-size: .84rem; color: rgba(255,255,255,.5); padding: 5px 0; }
.fg-contact p i { color: var(--mint); width: 16px; }
.fg-contact p a { color: rgba(255,255,255,.5); }
.fg-contact p a:hover { color: var(--mint); }
.footer-bottom { text-align: center; padding: 18px; font-size: .78rem; color: rgba(255,255,255,.25); }

/* ── 17. FLOATING BTNS ── */
.fbtns {
  position: fixed;
  right: 18px; bottom: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 900;
}
.fb-zalo, .fb-call {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 50px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: .82rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--t);
  white-space: nowrap;
  border: none;
}
.fb-zalo { background: #0068ff; color: #fff; }
.fb-call  { background: linear-gradient(135deg, var(--mint), var(--mint-d)); color: #fff; }
.fb-zalo:hover, .fb-call:hover { transform: translateY(-2px) scale(1.03); box-shadow: var(--shadow-lg); }
.fb-top {
  align-self: flex-end;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--g200);
  color: var(--g600);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  transition: all var(--t);
}
.fb-top:hover { border-color: var(--mint); color: var(--mint-d); }

/* ── 18. RESPONSIVE ── */
@media (max-width: 1024px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .sub-grid { grid-template-columns: repeat(3, 1fr); }
  .results-masonry { grid-template-columns: repeat(2, 1fr); }
  .price-cards { grid-template-columns: 1fr 1fr; }
  .steps-row { grid-template-columns: repeat(2, 1fr); gap: 28px; }
}

@media (max-width: 768px) {
  .section-pad { padding: 60px 0; }
  .topbar { display: none; }
  .navbar { top: 0; }

  /* Nav */
  .hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 70px; left: 0; right: 0;
    background: #fff;
    z-index: 999;
    flex-direction: column;
    padding: 18px;
    gap: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,.1);
    border-top: 1px solid var(--g100);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 12px; width: 100%; }

  /* Hero */
  .hero { padding-top: 90px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-right { order: -1; }
  .photo-ring { width: 260px; height: 260px; }
  .hero-photo-wrap { width: 300px; margin: 0 auto; }
  .fc-top { top: 0; right: 0; }
  .fc-right { bottom: 50px; right: -10px; }
  .fc-bottom { bottom: 0; left: 0; }
  .trust-bar { flex-wrap: wrap; justify-content: center; }
  .hero-actions { flex-direction: column; }
  .btn-hero-primary, .btn-hero-zalo { justify-content: center; }

  /* Sections */
  .about-wrap, .method-wrap, .contact-wrap { grid-template-columns: 1fr; gap: 40px; }
  .about-img { height: 300px; }
  .about-overlay-card { position: static; margin-top: 16px; }
  .method-img img { height: 280px; }
  .testi-grid { grid-template-columns: 1fr; }
  .sub-grid { grid-template-columns: repeat(2, 1fr); }
  .results-masonry { grid-template-columns: 1fr; }
  .price-cards { grid-template-columns: 1fr; }
  .steps-row { grid-template-columns: 1fr 1fr; }
  .free-trial-banner { flex-direction: column; text-align: center; }
  .ftb-btn { margin: 8px auto 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .contact-right { padding: 24px 18px; }
}

@media (max-width: 480px) {
  .sub-grid { grid-template-columns: 1fr 1fr; }
  .steps-row { grid-template-columns: 1fr; }
  .fb-zalo span, .fb-call span { display: none; }
  .fb-zalo, .fb-call { width: 52px; height: 52px; padding: 0; justify-content: center; border-radius: 50%; }
}