/* ==================== CSS Variables ==================== */
:root {
  --color-primary: #0891B2;
  --color-primary-dark: #134E4A;
  --color-primary-darker: #0F2A2A;
  --color-accent: #22D3EE;
  --color-green: #16A34A;
  --color-bg: #F0FDFA;
  --color-bg-mint: #CCFBF1;
  --color-white: #FFFFFF;
  --color-text: #134E4A;
  --color-text-gray: #64748B;
  --color-text-light: #A7D8D4;
  --color-text-lighter: #7FB8B4;
  --color-border-light: rgba(255, 255, 255, 0.1);
  --color-tag-bg: #E8F1F6;

  --font-heading: 'Lora', 'Noto Serif SC', Georgia, serif;
  --font-body: 'Raleway', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 16px rgba(8, 145, 178, 0.08);
  --shadow-md: 0 8px 24px rgba(8, 145, 178, 0.10);

  --container-max: 1200px;
  --section-padding: 80px 0;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

/* ==================== Utilities ==================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-padding);
}

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

.center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ==================== Tags ==================== */
.tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-family: var(--font-body);
  margin-bottom: 16px;
}

.tag-light { background: var(--color-tag-bg); color: var(--color-primary); }
.tag-dark { background: rgba(14, 107, 107, 0.6); color: var(--color-accent); }
.tag-mint { background: var(--color-bg-mint); color: var(--color-primary); }

/* ==================== Section Header ==================== */
.section-header {
  margin-bottom: 56px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section-desc {
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--color-text-gray);
  line-height: 1.7;
}

/* Ensure section header children fill width for proper text wrapping when centered */
.section-header.center .section-desc,
.section-header.center .section-title {
  width: 100%;
}

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary { background: var(--color-primary); color: var(--color-white); }
.btn-primary:hover { box-shadow: 0 4px 20px rgba(8, 145, 178, 0.4); }

.btn-accent { background: var(--color-accent); color: var(--color-primary-dark); }
.btn-accent:hover { box-shadow: 0 4px 20px rgba(34, 211, 238, 0.4); }

.btn-outline-light {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
}
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.2); }

.btn-white { background: var(--color-white); color: var(--color-primary); }
.btn-white:hover { box-shadow: 0 4px 20px rgba(255, 255, 255, 0.4); }

.btn-sm { padding: 10px 24px; font-size: 14px; }
.btn-lg { padding: 16px 40px; font-size: 18px; font-weight: 700; }

/* ==================== Icon Boxes ==================== */
.icon-box {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.icon-primary { background: var(--color-primary); color: var(--color-white); }
.icon-accent { background: var(--color-accent); color: var(--color-primary-dark); }
.icon-green { background: var(--color-green); color: var(--color-white); }

.icon-box:not(.icon-sm):not(.icon-lg) { width: 48px; height: 48px; }
.icon-sm { width: 40px; height: 40px; border-radius: 10px; }
.icon-lg { width: 56px; height: 56px; border-radius: var(--radius-md); }

/* ==================== Header ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s ease;
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.logo-text { display: flex; flex-direction: column; }

.logo-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.logo-sub {
  font-size: 11px;
  color: var(--color-text-gray);
}

.nav {
  display: flex;
  gap: 40px;
  align-items: center;
}

.nav-link {
  font-size: 15px;
  color: var(--color-primary-dark);
  transition: color 0.2s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s;
}

.nav-link:hover { color: var(--color-primary); }
.nav-link:hover::after { width: 100%; }

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header-phone {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

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

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary-dark);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ==================== Hero ==================== */
.hero {
  position: relative;
  background: var(--color-primary-dark);
  padding: 120px 0 0;
  overflow: hidden;
}

.hero-bg-decoration {
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 60px;
  position: relative;
}

.hero-left {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 13px;
  align-self: flex-start;
}

.hero-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
}

.hero-sub {
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 520px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-trust {
  font-size: 13px;
  color: var(--color-text-lighter);
}

.hero-right {
  flex: 1;
  max-width: 580px;
}

.hero-right img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: var(--radius-xl);
}

.hero-stats {
  display: flex;
  padding: 32px 40px 48px;
  gap: 0;
  position: relative;
}

.stat-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-family: var(--font-heading);
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 700;
  color: var(--color-accent);
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ==================== Problem Section ==================== */
.problem-section { background: var(--color-white); }

.problem-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.problem-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.problem-card h3 {
  font-size: 18px;
  color: var(--color-text);
}

.problem-card p {
  font-size: 14px;
  color: var(--color-text-gray);
  line-height: 1.6;
}

/* ==================== How It Works ==================== */
.how-section { background: var(--color-primary-dark); }

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.how-step {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}

.how-step-highlight {
  background: rgba(14, 107, 107, 0.6);
  border-radius: var(--radius-md);
}

.step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
}

.step-num-primary { background: var(--color-primary); color: var(--color-white); }
.step-num-accent { background: var(--color-accent); color: var(--color-primary-dark); }
.step-num-green { background: var(--color-green); color: var(--color-white); }

.how-step h3 { font-size: 20px; }
.how-step p { font-size: 14px; color: var(--color-text-light); line-height: 1.6; }

/* ==================== Core Services ==================== */
.services-section { background: var(--color-white); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.service-card {
  padding: 40px 36px;
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: var(--shadow-md);
}

.service-card-light { background: var(--color-bg); }
.service-card-dark { background: var(--color-primary-dark); }

.service-card h3 { font-size: 22px; }
.service-card p { font-size: 14px; line-height: 1.7; }
.service-card-light p { color: var(--color-text-gray); }
.service-card-dark p { color: var(--color-text-light); }

/* ==================== Features Grid ==================== */
.features-section { background: var(--color-bg); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-card h4 { font-size: 16px; color: var(--color-text); }
.feature-card p { font-size: 13px; color: var(--color-text-gray); line-height: 1.6; }

/* ==================== Social Proof ==================== */
.social-section { background: var(--color-white); }

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 48px;
}

.stat-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
}

.stat-big {
  font-family: var(--font-heading);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  color: var(--color-primary);
}

.stat-text { font-size: 15px; color: var(--color-text-gray); }

.testimonials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial {
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.testimonial-light { background: var(--color-bg); }
.testimonial-dark { background: var(--color-primary-dark); }

.testimonial p {
  font-size: 14px;
  line-height: 1.7;
}

.testimonial-light p { color: var(--color-text); }
.testimonial-dark p { color: var(--color-text-light); }

.testimonial-author {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
}

.testimonial-author-accent { color: var(--color-accent); }

/* ==================== Courses ==================== */
.courses-section { background: var(--color-primary-dark); }

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.course-card {
  background: rgba(30, 107, 107, 1);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.course-img {
  width: 100%;
  height: 160px;
  overflow: hidden;
}

.course-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.course-body {
  padding: 20px 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.course-label {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  color: var(--color-white);
  align-self: flex-start;
}

.course-label-primary { background: var(--color-primary); }
.course-label-green { background: var(--color-green); }
.course-label-accent { background: var(--color-accent); color: var(--color-primary-dark); }

.course-body h3 { font-size: 18px; color: var(--color-white); }
.course-body p { font-size: 13px; color: var(--color-text-light); line-height: 1.6; }

/* ==================== FAQ ==================== */
.faq-section { background: var(--color-bg); }

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.3s;
}

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

.faq-question {
  width: 100%;
  padding: 24px 28px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  text-align: left;
}

.faq-icon {
  font-size: 24px;
  color: var(--color-primary);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.faq-item.active .faq-icon { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 28px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 28px 24px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-gray);
  line-height: 1.7;
}

/* ==================== Final CTA ==================== */
.cta-section {
  background: var(--color-primary);
  padding: 80px 0;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
}

.cta-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
}

.cta-sub {
  font-size: clamp(16px, 1.5vw, 18px);
  color: #CFFAFE;
  line-height: 1.6;
  max-width: 600px;
}

.cta-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.cta-trust {
  font-size: 14px;
  color: #A5F3FC;
}

/* ==================== Footer ==================== */
.footer {
  background: var(--color-primary-darker);
  padding: 64px 0 40px;
}

.footer-top {
  display: grid;
  grid-template-columns: 320px 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
}

.footer-tagline {
  font-size: 13px;
  color: var(--color-accent);
}

.footer-about {
  font-size: 13px;
  color: var(--color-text-lighter);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 4px;
}

.footer-links a, .footer-links p {
  font-size: 13px;
  color: var(--color-text-lighter);
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--color-accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
  font-size: 12px;
  color: #4A8A86;
}

.footer-bottom a { transition: color 0.2s; }
.footer-bottom a:hover { color: var(--color-accent); }

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
  .hero-inner { flex-direction: column; text-align: center; }
  .hero-left { align-items: center; }
  .hero-sub { max-width: 600px; }
  .hero-right { max-width: 100%; }
  .hero-right img { height: 360px; }

  .problem-cards { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .how-steps { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .services-grid { grid-template-columns: 1fr; max-width: 600px; margin: 0 auto; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .testimonials { grid-template-columns: 1fr; max-width: 600px; margin: 0 auto; }
  .courses-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }

  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .container { padding: 0 24px; }
  .section { padding: 60px 0; }

  .nav, .header-phone { display: none; }
  .menu-toggle { display: flex; }

  .nav.active {
    display: flex;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow-md);
  }

  .hero { padding-top: 100px; }
  .hero-stats { flex-direction: column; gap: 24px; }

  .features-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .cta-btns { flex-direction: column; width: 100%; }
  .cta-btns .btn { width: 100%; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 36px; }
  .section-title { font-size: 28px; }
  .stats-row { grid-template-columns: 1fr; }
  .header-right .btn { display: none; }
}

/* ==================== Color Override Fix ==================== */
/* Higher specificity to ensure text-white/text-light override section-title/section-desc */
.section-title.text-white { color: var(--color-white); }
.section-desc.text-light { color: var(--color-text-light); }
.tag.text-white { color: var(--color-white); }