:root {
  --blue-950: #0b2447;
  --blue-800: #14539a;
  --blue-600: #1e88e5;
  --blue-500: #2f9cf4;
  --cyan-100: #e8f8ff;
  --cyan-50: #f4fcff;
  --line: #cde7f8;
  --ink: #14243d;
  --muted: #607086;
  --white: #ffffff;
  --shadow: 0 18px 44px rgba(20, 83, 154, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  background: var(--cyan-50);
  overflow-x: hidden;
}

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

img,
video,
iframe {
  max-width: 100%;
}

img,
video {
  height: auto;
}

iframe {
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(205, 231, 248, 0.82);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--white);
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue-600), #18c7d7);
  border-radius: 8px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--blue-950);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
}

.brand small {
  color: var(--muted);
  font-size: 0.74rem;
}

.nav {
  display: flex;
  gap: clamp(12px, 2.4vw, 30px);
  color: var(--blue-950);
  font-size: 0.95rem;
  font-weight: 700;
}

.nav a {
  padding: 8px 0;
}

.hero {
  min-height: 660px;
  display: grid;
  align-items: center;
  padding: 96px clamp(18px, 5vw, 72px);
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98) 0%, rgba(244, 252, 255, 0.92) 46%, rgba(244, 252, 255, 0.22) 76%),
    url("assets/hero-online-tutoring.png") center right / cover no-repeat;
}

.hero-content {
  width: min(640px, 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue-600);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  color: var(--blue-950);
  font-size: clamp(2.4rem, 6vw, 5.6rem);
  line-height: 1.08;
}

.hero-copy {
  max-width: 600px;
  margin: 26px 0 34px;
  color: #33445d;
  font-size: clamp(1.02rem, 1.6vw, 1.18rem);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  line-height: 1.2;
  cursor: pointer;
}

.primary {
  color: var(--white);
  background: var(--blue-600);
  box-shadow: 0 14px 28px rgba(30, 136, 229, 0.25);
}

.secondary,
.tertiary {
  color: var(--blue-800);
  background: var(--white);
  border-color: var(--line);
}

.pricing-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  color: var(--blue-800);
  font-weight: 800;
  border-bottom: 2px solid var(--line);
}

.trust-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.trust-band div {
  padding: 28px clamp(18px, 4vw, 48px);
  background: var(--white);
}

.trust-band strong,
.trust-band span {
  display: block;
}

.trust-band strong {
  color: var(--blue-950);
  font-size: 1.05rem;
}

.trust-band span {
  color: var(--muted);
  font-size: 0.92rem;
}

.section {
  padding: 96px clamp(18px, 5vw, 72px);
  background: var(--white);
  overflow-x: clip;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2,
.contact-copy h2 {
  margin: 0;
  color: var(--blue-950);
  font-size: clamp(1.8rem, 3.4vw, 3rem);
  line-height: 1.22;
}

.feature-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  min-width: 0;
}

.duration-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.price-card,
.leader-card,
.faq-list details,
.booking-complete,
.contact-form {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.feature-card {
  padding: 32px;
}

.icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  margin-bottom: 20px;
  color: var(--blue-800);
  font-weight: 900;
  background: var(--cyan-100);
  border-radius: 8px;
}

.feature-card h3,
.price-card h3 {
  margin: 0 0 10px;
  color: var(--blue-950);
  font-size: 1.22rem;
}

.feature-card p,
.leader-card p,
.contact-copy p,
.pricing-note {
  margin: 0;
  color: var(--muted);
}

.promise-section {
  background: var(--cyan-50);
}

.promise-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 24px;
  align-items: stretch;
}

.promise-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.promise-list p {
  position: relative;
  margin: 0;
  padding: 18px 18px 18px 44px;
  color: var(--blue-950);
  font-weight: 800;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.promise-list p::before {
  position: absolute;
  top: 18px;
  left: 18px;
  color: var(--blue-600);
  font-weight: 900;
  content: "✓";
}

.promise-list p:last-child {
  grid-column: 1 / -1;
}

.leader-card {
  padding: 30px;
}

.leader-card h3 {
  margin: 0 0 14px;
  color: var(--blue-950);
  font-size: clamp(1.35rem, 2vw, 1.8rem);
  line-height: 1.35;
}

.leader-card p + p {
  margin-top: 14px;
}

.leader-profile {
  padding: 24px;
}

.leader-profile-inner {
  display: grid;
  grid-template-columns: minmax(132px, 0.42fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.leader-photo {
  width: min(100%, 220px);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 34px rgba(20, 83, 154, 0.14);
  background: var(--cyan-50);
}

.leader-title {
  margin: -4px 0 14px;
  color: var(--blue-800);
  font-weight: 900;
}

.experience-section {
  background: var(--white);
}

.experience-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.experience-list p {
  margin: 0;
  padding: 18px;
  color: var(--blue-950);
  font-weight: 800;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--cyan-50);
}

.youtube-section {
  background: linear-gradient(180deg, var(--cyan-50), var(--white));
}

.section-copy {
  max-width: 640px;
  margin: 18px 0 24px;
  color: var(--muted);
}

.youtube-layout {
  display: grid;
  gap: 28px;
}

.youtube-intro {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

.youtube-photo {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: var(--white);
}

.youtube-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.youtube-card {
  display: grid;
  gap: 12px;
  align-content: start;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.youtube-card h3 {
  margin: 0;
  color: var(--blue-950);
  font-size: 1.02rem;
  line-height: 1.55;
}

.youtube-card p {
  margin: 0;
  color: var(--muted);
}

.video-embed {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid #bdddf1;
  border-radius: 8px;
  background: var(--cyan-50);
}

.video-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.youtube-video-link {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  min-height: 36px;
  color: var(--blue-800);
  font-size: 0.92rem;
  font-weight: 900;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.pricing-section {
  background: linear-gradient(180deg, var(--cyan-50), #ffffff);
}

.price-card {
  position: relative;
  padding: clamp(24px, 2.4vw, 30px);
}

.price-card.featured {
  border-color: rgba(30, 136, 229, 0.55);
  transform: translateY(-10px);
}

.badge {
  position: absolute;
  top: 18px;
  right: 18px;
  margin: 0;
  padding: 5px 10px;
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 800;
  background: #13a6c9;
  border-radius: 999px;
}

.plan-name {
  margin: 0 0 10px;
  color: var(--blue-800);
  font-weight: 900;
}

.price {
  margin: 0;
  color: var(--blue-950);
}

.price span {
  font-size: clamp(1.65rem, 3vw, 2.55rem);
  font-weight: 900;
  line-height: 1;
}

.per-lesson {
  margin: 8px 0 0;
  color: var(--blue-800);
  font-weight: 900;
}

.plan-note {
  margin: 6px 0 22px;
  color: var(--muted);
}

ul {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

li {
  position: relative;
  padding-left: 24px;
  color: #40516a;
}

li + li {
  margin-top: 10px;
}

li::before {
  position: absolute;
  left: 0;
  color: var(--blue-600);
  font-weight: 900;
  content: "✓";
}

.full {
  width: 100%;
}

.pricing-note {
  margin-top: 22px;
  font-size: 0.94rem;
}

.faq-section {
  background: var(--white);
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 920px;
}

.faq-list details {
  padding: 0;
  overflow: hidden;
}

.faq-list summary {
  padding: 20px 24px;
  color: var(--blue-950);
  font-weight: 900;
  cursor: pointer;
}

.faq-list summary::marker {
  color: var(--blue-600);
}

.faq-list p {
  margin: 0;
  padding: 0 24px 22px;
  color: var(--muted);
}

.booking-section {
  background: var(--white);
}

.booking-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.55fr);
  gap: 24px;
  align-items: start;
  min-width: 0;
}

.booking-form,
.booking-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.booking-form {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 4vw, 34px);
}

.booking-complete {
  display: grid;
  gap: 12px;
  padding: clamp(26px, 4vw, 36px);
  align-self: start;
}

.booking-complete[hidden] {
  display: none;
}

.booking-complete h3 {
  margin: 0;
  color: var(--blue-950);
  font-size: clamp(1.45rem, 2.4vw, 2rem);
  line-height: 1.35;
}

.booking-complete p {
  margin: 0;
  color: var(--muted);
  font-weight: 800;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.slot-fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

.slot-fieldset legend {
  margin-bottom: 10px;
  color: var(--blue-950);
  font-weight: 900;
}

.slot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.preference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.slot-option {
  position: relative;
}

.slot-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.slot-option span {
  display: grid;
  min-height: 64px;
  align-content: center;
  gap: 2px;
  padding: 10px 12px;
  color: var(--blue-950);
  font-weight: 900;
  line-height: 1.35;
  border: 1px solid #bdddf1;
  border-radius: 8px;
  background: var(--cyan-50);
  cursor: pointer;
}

.slot-option small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.slot-option input:checked + span {
  color: var(--white);
  border-color: var(--blue-600);
  background: var(--blue-600);
  box-shadow: 0 12px 26px rgba(30, 136, 229, 0.22);
}

.slot-option input:checked + span small {
  color: rgba(255, 255, 255, 0.86);
}

.slot-option input:disabled + span {
  color: #8a98aa;
  background: #f1f5f8;
  cursor: not-allowed;
  text-decoration: line-through;
}

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

.booking-note {
  margin: -4px 0 0;
  color: var(--muted);
  font-weight: 800;
}

.utility-button {
  min-height: 48px;
  padding: 12px 0;
  color: var(--blue-800);
  font: inherit;
  font-weight: 800;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.booking-panel {
  padding: 26px;
}

.booking-panel h3 {
  margin: 0 0 10px;
  color: var(--blue-950);
  font-size: 1.28rem;
}

.booking-panel p {
  margin: 0 0 18px;
  color: var(--muted);
}

.reservation-list {
  display: grid;
  gap: 12px;
}

.reservation-item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--cyan-50);
}

.reservation-item strong,
.reservation-item span {
  display: block;
}

.reservation-item strong {
  color: var(--blue-950);
}

.reservation-item span {
  color: var(--muted);
  font-size: 0.92rem;
}

.reservation-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.reservation-tools a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 8px 10px;
  color: var(--blue-800);
  font-size: 0.86rem;
  font-weight: 900;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.empty-reservation {
  padding: 18px;
  color: var(--muted);
  border: 1px dashed #bdddf1;
  border-radius: 8px;
  background: var(--cyan-50);
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  min-width: 0;
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: clamp(22px, 4vw, 34px);
}

label {
  display: grid;
  gap: 8px;
  color: var(--blue-950);
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  color: var(--ink);
  font: inherit;
  border: 1px solid #bdddf1;
  border-radius: 8px;
  outline: none;
  background: var(--white);
  min-width: 0;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue-600);
  box-shadow: 0 0 0 4px rgba(30, 136, 229, 0.13);
}

.form-message {
  min-height: 24px;
  margin: 0;
  color: var(--blue-800);
  font-weight: 800;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  padding: 28px clamp(18px, 5vw, 72px);
  color: #6d7b8f;
  border-top: 1px solid var(--line);
}

.footer p {
  margin: 0;
}

.footer-info {
  display: grid;
  gap: 4px;
  max-width: 680px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.footer a {
  color: var(--blue-800);
  font-weight: 800;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.legal-hero {
  padding: 92px clamp(18px, 5vw, 72px) 56px;
  background: linear-gradient(180deg, var(--cyan-50), var(--white));
}

.legal-hero-inner {
  max-width: 920px;
}

.legal-hero h1 {
  margin: 0;
  color: var(--blue-950);
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 1.14;
}

.legal-hero p {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
}

.legal-section {
  padding-top: 48px;
}

.legal-table {
  display: grid;
  max-width: 980px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow);
}

.legal-table > div {
  display: grid;
  grid-template-columns: minmax(180px, 0.32fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

.legal-table > div:last-child {
  border-bottom: 0;
}

.legal-table dt,
.legal-table dd {
  margin: 0;
  padding: 20px 22px;
}

.legal-table dt {
  color: var(--blue-950);
  font-weight: 900;
  background: var(--cyan-50);
}

.legal-table dd {
  color: #40516a;
}

.legal-table dd small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.legal-table a,
.legal-inline-link {
  color: var(--blue-800);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.legal-price-list {
  margin: 12px 0 0;
}

.privacy-table .legal-price-list {
  display: grid;
  gap: 6px;
}

.terms-list {
  display: grid;
  gap: 16px;
  max-width: 980px;
}

.terms-article {
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.terms-article h2 {
  margin: 0 0 12px;
  color: var(--blue-950);
  font-size: clamp(1.18rem, 2vw, 1.45rem);
  line-height: 1.35;
}

.terms-article p {
  margin: 0;
  color: #40516a;
}

.terms-article p + p,
.terms-article p + ol,
.terms-article p + ul {
  margin-top: 10px;
}

.terms-article ol,
.terms-article ul {
  margin: 0;
  padding-left: 1.4em;
}

.terms-article li {
  padding-left: 0;
}

.terms-article li::before {
  content: none;
}

.legal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 28px;
}

@media (max-width: 840px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .hero {
    min-height: 660px;
    align-items: end;
    padding-top: 250px;
    background:
      linear-gradient(180deg, rgba(244, 252, 255, 0.1) 0%, rgba(244, 252, 255, 0.94) 50%, rgba(244, 252, 255, 1) 100%),
      url("assets/hero-online-tutoring.png") center top / auto 360px no-repeat;
  }

  .trust-band,
  .feature-grid,
  .pricing-grid,
  .promise-layout,
  .promise-list,
  .experience-list,
  .youtube-intro,
  .youtube-card-grid,
  .booking-layout,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .slot-grid,
  .preference-grid,
  .field-grid {
    grid-template-columns: 1fr;
  }

  .price-card.featured {
    transform: none;
  }
}

@media (max-width: 520px) {
  .brand small {
    display: none;
  }

  .nav {
    flex-wrap: wrap;
    gap: 6px 12px;
    font-size: 0.82rem;
  }

  .nav a {
    padding: 6px 0;
  }

  .hero {
    min-height: 620px;
    padding-bottom: 48px;
  }

  .hero-actions .button,
  .youtube-section .button,
  .price-card .button,
  .booking-actions .button,
  .booking-complete .button,
  .contact-form .button {
    width: 100%;
    min-height: 52px;
  }

  .pricing-link {
    width: fit-content;
  }

  .section {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .section-heading {
    margin-bottom: 26px;
  }

  .feature-card,
  .leader-card,
  .booking-panel,
  .contact-form {
    padding: 24px;
  }

  .faq-list summary {
    padding: 18px 18px;
  }

  .faq-list p {
    padding: 0 18px 18px;
  }
}

@media (max-width: 390px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand strong {
    font-size: 1rem;
  }

  .nav {
    font-size: 0.78rem;
    gap: 4px 10px;
  }

  .hero {
    min-height: 590px;
    padding: 220px 18px 42px;
    background:
      linear-gradient(180deg, rgba(244, 252, 255, 0.08) 0%, rgba(244, 252, 255, 0.96) 48%, rgba(244, 252, 255, 1) 100%),
      url("assets/hero-online-tutoring.png") center top / auto 315px no-repeat;
  }

  h1 {
    font-size: 2.05rem;
    line-height: 1.16;
  }

  .hero-copy {
    margin: 20px 0 26px;
    font-size: 1rem;
  }

  .section {
    padding: 52px 18px;
  }

  .section-heading h2,
  .contact-copy h2 {
    font-size: 1.62rem;
  }

  .feature-card,
  .price-card,
  .leader-card,
  .booking-form,
  .booking-panel,
  .booking-complete,
  .contact-form {
    padding: 22px;
  }

  .leader-profile-inner {
    grid-template-columns: 1fr;
  }

  .leader-photo {
    width: min(72vw, 240px);
    justify-self: center;
  }

  .price span {
    font-size: 1.72rem;
  }

  .button {
    padding-right: 16px;
    padding-left: 16px;
  }

  .reservation-tools a {
    width: 100%;
    justify-content: center;
  }

  .footer {
    display: grid;
    gap: 8px;
  }

  .footer-links {
    display: grid;
    gap: 6px;
  }

  .legal-hero {
    padding: 64px 18px 36px;
  }

  .legal-table > div {
    grid-template-columns: 1fr;
  }

  .legal-table dt {
    padding-bottom: 8px;
  }

  .legal-table dd {
    padding-top: 10px;
  }

  .legal-actions .button {
    width: 100%;
  }
}