/* ==========================================================
   PYCLASS PÚBLICO
   Versión: 1.0.0
========================================================== */

:root {
  --public-bg: #f4f6f8;
  --public-bg-soft: #eef1f4;
  --public-surface: #ffffff;
  --public-surface-dark: #111827;
  --public-surface-darker: #0b1220;

  --public-text: #18202d;
  --public-text-soft: #4e5c6e;
  --public-text-muted: #718096;
  --public-text-light: #f8fafc;

  --public-primary: #1f3a5f;
  --public-primary-hover: #172f50;
  --public-primary-soft: #e8eef5;

  --public-accent: #4f6f8f;
  --public-accent-light: #dce6ef;

  --public-green: #2f6b55;
  --public-green-soft: #e7f2ed;

  --public-purple: #5e568c;
  --public-purple-soft: #eceaf6;

  --public-amber: #a06a2b;
  --public-amber-soft: #f6ede1;

  --public-border: #dce2e8;
  --public-border-dark: rgba(255, 255, 255, 0.12);

  --public-shadow-soft:
    0 12px 30px rgba(17, 24, 39, 0.06);

  --public-shadow:
    0 24px 60px rgba(17, 24, 39, 0.1);

  --public-shadow-strong:
    0 30px 80px rgba(17, 24, 39, 0.16);

  --public-radius-sm: 12px;
  --public-radius: 18px;
  --public-radius-lg: 26px;
  --public-radius-xl: 34px;

  --public-max-width: 1200px;

  --public-transition:
    180ms ease;
}

/* ==========================================================
   RESET
========================================================== */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  min-width: 320px;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: var(--public-bg);
  color: var(--public-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

.site-shell {
  min-height: 100vh;
  overflow: hidden;
}

.public-container {
  width: min(calc(100% - 40px), var(--public-max-width));
  margin-inline: auto;
}

.hidden {
  display: none !important;
}

/* ==========================================================
   HEADER
========================================================== */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: rgba(244, 246, 248, 0.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  transition:
    background var(--public-transition),
    border-color var(--public-transition),
    box-shadow var(--public-transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--public-border);
  box-shadow: 0 12px 28px rgba(17, 24, 39, 0.05);
}

.header-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-symbol {
  position: relative;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  overflow: hidden;
  color: var(--public-text-light);
  background:
    linear-gradient(
      145deg,
      #1c2f49,
      #33577d
    );
  box-shadow: 0 12px 24px rgba(31, 58, 95, 0.18);
}

.brand-symbol-primary {
  position: absolute;
  left: 10px;
  top: 8px;
  font-size: 1.15rem;
  font-weight: 850;
}

.brand-symbol-secondary {
  position: absolute;
  right: 9px;
  bottom: 6px;
  font-size: 1rem;
  font-weight: 650;
  opacity: 0.72;
}

.brand-copy {
  display: grid;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.brand-copy span {
  margin-top: 5px;
  color: var(--public-text-muted);
  font-size: 0.73rem;
  font-weight: 600;
}

.desktop-navigation {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.navigation-link {
  position: relative;
  padding: 30px 0 28px;
  color: var(--public-text-soft);
  font-size: 0.94rem;
  font-weight: 650;
  transition: color var(--public-transition);
}

.navigation-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 20px;
  height: 2px;
  border-radius: 999px;
  background: var(--public-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--public-transition);
}

.navigation-link:hover,
.navigation-link.active {
  color: var(--public-primary);
}

.navigation-link:hover::after,
.navigation-link.active::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.classroom-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 16px;
  border: 1px solid var(--public-border);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--public-primary);
  font-size: 0.88rem;
  font-weight: 750;
  box-shadow: var(--public-shadow-soft);
  transition:
    transform var(--public-transition),
    border-color var(--public-transition),
    background var(--public-transition);
}

.classroom-link:hover {
  transform: translateY(-1px);
  border-color: #becbd8;
  background: var(--public-surface);
}

.classroom-link-icon {
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
  font-size: 0.78rem;
}

.mobile-menu-button {
  width: 44px;
  height: 44px;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
  border-radius: 12px;
  background: var(--public-surface);
  border: 1px solid var(--public-border);
}

.mobile-menu-button span {
  width: 19px;
  height: 2px;
  border-radius: 999px;
  background: var(--public-text);
  transition:
    transform var(--public-transition),
    opacity var(--public-transition);
}

.mobile-menu-button.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-button.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-button.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-navigation {
  display: none;
  border-top: 1px solid var(--public-border);
  background: rgba(255, 255, 255, 0.98);
}

.mobile-navigation.open {
  display: block;
}

.mobile-navigation-inner {
  display: grid;
  padding-top: 18px;
  padding-bottom: 24px;
}

.mobile-navigation-inner > a {
  padding: 14px 4px;
  border-bottom: 1px solid #edf0f3;
  color: var(--public-text-soft);
  font-weight: 700;
}

.mobile-classroom-link {
  margin-top: 16px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0 !important;
  border-radius: 13px;
  background: var(--public-primary);
  color: white !important;
}

/* ==========================================================
   COMMON
========================================================== */

.eyebrow,
.section-kicker {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--public-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow {
  padding: 9px 13px;
  border: 1px solid #d3dde7;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  letter-spacing: 0.06em;
  box-shadow: var(--public-shadow-soft);
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--public-green);
  box-shadow: 0 0 0 5px rgba(47, 107, 85, 0.1);
}

.section-kicker-light {
  color: #b9cce0;
}

.section-heading {
  max-width: 700px;
}

.section-heading.centered {
  margin-inline: auto;
  text-align: center;
}

.section-heading.centered .section-kicker {
  margin-inline: auto;
}

.section-heading h2,
.how-copy h2,
.tutoring-copy h2,
.support-copy h2,
.classroom-panel-copy h2 {
  margin: 15px 0 14px;
  color: var(--public-text);
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.section-heading p,
.how-copy > p,
.tutoring-copy > p,
.support-copy p,
.classroom-panel-copy p {
  margin-bottom: 0;
  color: var(--public-text-soft);
  font-size: 1.04rem;
  line-height: 1.75;
}

.section-heading-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 34px;
}

.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0 21px;
  border-radius: 14px;
  font-size: 0.95rem;
  font-weight: 800;
  transition:
    transform var(--public-transition),
    background var(--public-transition),
    border-color var(--public-transition),
    box-shadow var(--public-transition);
}

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

.button-primary {
  background: var(--public-primary);
  color: white;
  box-shadow: 0 14px 26px rgba(31, 58, 95, 0.2);
}

.button-primary:hover {
  background: var(--public-primary-hover);
}

.button-secondary {
  border: 1px solid var(--public-border);
  background: rgba(255, 255, 255, 0.82);
  color: var(--public-text);
}

.button-secondary:hover {
  border-color: #becbd8;
  background: white;
}

.button-light {
  background: white;
  color: var(--public-primary);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.15);
}

.button-dark {
  background: var(--public-surface-dark);
  color: white;
}

.text-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0;
  background: transparent;
  color: var(--public-primary);
  font-weight: 800;
  white-space: nowrap;
}

/* ==========================================================
   HERO
========================================================== */

.hero-section {
  position: relative;
  padding: 162px 0 92px;
  background:
    radial-gradient(
      circle at 11% 22%,
      rgba(68, 103, 138, 0.12),
      transparent 28%
    ),
    radial-gradient(
      circle at 88% 16%,
      rgba(94, 86, 140, 0.09),
      transparent 24%
    ),
    linear-gradient(
      180deg,
      #f7f8fa 0%,
      var(--public-bg) 100%
    );
}

.hero-background-shape {
  position: absolute;
  border-radius: 999px;
  pointer-events: none;
  filter: blur(2px);
}

.hero-shape-one {
  width: 340px;
  height: 340px;
  top: 120px;
  right: -170px;
  background: rgba(79, 111, 143, 0.08);
}

.hero-shape-two {
  width: 220px;
  height: 220px;
  left: -120px;
  bottom: -60px;
  background: rgba(47, 107, 85, 0.07);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns:
    minmax(0, 1.04fr)
    minmax(440px, 0.96fr);
  gap: 74px;
  align-items: center;
}

.hero-copy h1 {
  max-width: 760px;
  margin: 24px 0 22px;
  color: var(--public-text);
  font-size: clamp(3rem, 6vw, 5.35rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.hero-copy h1 span {
  display: block;
  color: var(--public-primary);
}

.hero-description {
  max-width: 660px;
  margin-bottom: 0;
  color: var(--public-text-soft);
  font-size: 1.13rem;
  line-height: 1.76;
}

.hero-actions {
  display: flex;
  gap: 13px;
  flex-wrap: wrap;
  margin-top: 31px;
}

.hero-benefits {
  display: flex;
  gap: 20px 28px;
  flex-wrap: wrap;
  margin-top: 29px;
}

.hero-benefit {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--public-text-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.hero-benefit-icon {
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--public-green-soft);
  color: var(--public-green);
  font-size: 0.74rem;
  font-weight: 900;
}

.hero-visual {
  position: relative;
  min-height: 600px;
  display: grid;
  align-items: center;
}

.course-preview-card {
  position: relative;
  z-index: 2;
  overflow: hidden;
  border: 1px solid #d7dee6;
  border-radius: 26px;
  background: var(--public-surface);
  box-shadow: var(--public-shadow-strong);
  transform: rotate(1.1deg);
}

.course-preview-header {
  min-height: 54px;
  display: grid;
  grid-template-columns: 90px 1fr 90px;
  align-items: center;
  padding: 0 18px;
  border-bottom: 1px solid var(--public-border);
  background: #f6f7f9;
}

.preview-browser-actions {
  display: flex;
  gap: 6px;
}

.preview-browser-actions span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #c6ccd3;
}

.preview-browser-title {
  text-align: center;
  color: var(--public-text-muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.course-preview-content {
  padding: 29px;
}

.preview-course-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.preview-category,
.preview-access {
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 800;
}

.preview-category {
  background: var(--public-primary-soft);
  color: var(--public-primary);
}

.preview-access {
  background: var(--public-green-soft);
  color: var(--public-green);
}

.course-preview-content h2 {
  margin: 23px 0 11px;
  font-size: 1.72rem;
  letter-spacing: -0.035em;
}

.course-preview-content > p {
  margin-bottom: 24px;
  color: var(--public-text-soft);
  line-height: 1.65;
}

.preview-progress-block {
  padding: 16px;
  border-radius: 15px;
  background: #f5f7f9;
}

.preview-progress-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--public-text-soft);
  font-size: 0.79rem;
}

.preview-progress-head strong {
  color: var(--public-primary);
}

.preview-progress-track {
  height: 8px;
  margin-top: 11px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe5eb;
}

.preview-progress-track span {
  width: 35%;
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--public-primary);
}

.preview-modules {
  display: grid;
  gap: 11px;
  margin-top: 20px;
}

.preview-module {
  display: grid;
  grid-template-columns: 35px 1fr 25px;
  gap: 12px;
  align-items: center;
  padding: 13px;
  border: 1px solid var(--public-border);
  border-radius: 14px;
  background: white;
}

.preview-module.completed {
  background: #f7fbf9;
  border-color: #cfe1d8;
}

.preview-module.active {
  background: #f2f6fa;
  border-color: #becddd;
}

.preview-module-number {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--public-bg-soft);
  color: var(--public-text-soft);
  font-size: 0.77rem;
  font-weight: 850;
}

.preview-module.completed .preview-module-number {
  background: var(--public-green-soft);
  color: var(--public-green);
}

.preview-module.active .preview-module-number {
  background: var(--public-primary);
  color: white;
}

.preview-module div:nth-child(2) {
  display: grid;
  gap: 4px;
}

.preview-module strong {
  font-size: 0.83rem;
}

.preview-module div:nth-child(2) span {
  color: var(--public-text-muted);
  font-size: 0.7rem;
}

.preview-module-state {
  color: var(--public-text-muted);
  font-weight: 850;
}

.preview-module.completed .preview-module-state {
  color: var(--public-green);
}

.preview-module.active .preview-module-state {
  color: var(--public-primary);
}

.floating-card {
  position: absolute;
  z-index: 4;
  border: 1px solid var(--public-border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--public-shadow);
}

.floating-card-code {
  left: -52px;
  top: 54px;
  width: 215px;
  padding: 16px;
  transform: rotate(-3deg);
}

.floating-card-label {
  display: block;
  margin-bottom: 9px;
  color: var(--public-text-muted);
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.floating-card-code code {
  display: block;
  padding: 11px;
  border-radius: 9px;
  background: var(--public-surface-dark);
  color: #d5e6f5;
  font-size: 0.74rem;
}

.floating-card-progress {
  right: -44px;
  bottom: 52px;
  max-width: 245px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  transform: rotate(2deg);
}

.floating-progress-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--public-green-soft);
  color: var(--public-green);
  font-weight: 900;
}

.floating-card-progress div:last-child {
  display: grid;
  gap: 3px;
}

.floating-card-progress strong {
  font-size: 0.78rem;
}

.floating-card-progress span {
  color: var(--public-text-muted);
  font-size: 0.67rem;
  line-height: 1.4;
}

/* ==========================================================
   CATEGORIES
========================================================== */

.categories-section {
  padding: 100px 0;
  background: var(--public-surface);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 44px;
}

.category-card {
  position: relative;
  min-height: 340px;
  display: grid;
  align-content: space-between;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--public-border);
  border-radius: var(--public-radius-lg);
  box-shadow: var(--public-shadow-soft);
  transition:
    transform var(--public-transition),
    box-shadow var(--public-transition);
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--public-shadow);
}

.category-card::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -80px;
  bottom: -80px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
}

.category-mathematics {
  background:
    linear-gradient(
      145deg,
      #edf3f8,
      #dfe9f2
    );
}

.category-programming {
  background:
    linear-gradient(
      145deg,
      #e9eef4,
      #d9e3ed
    );
}

.category-university {
  background:
    linear-gradient(
      145deg,
      #eeedf5,
      #e1deee
    );
}

.category-icon {
  position: relative;
  z-index: 1;
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--public-primary);
  font-size: 1.55rem;
  font-weight: 800;
  box-shadow: var(--public-shadow-soft);
}

.category-content {
  position: relative;
  z-index: 1;
}

.category-label {
  color: var(--public-primary);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.category-content h3 {
  margin: 13px 0 11px;
  font-size: 1.43rem;
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.category-content p {
  margin-bottom: 19px;
  color: var(--public-text-soft);
  line-height: 1.65;
}

.category-content a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--public-primary);
  font-size: 0.86rem;
  font-weight: 850;
}

/* ==========================================================
   COURSES
========================================================== */

.courses-section {
  padding: 108px 0;
  background: var(--public-bg);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.course-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--public-border);
  border-radius: var(--public-radius-lg);
  background: var(--public-surface);
  box-shadow: var(--public-shadow-soft);
  transition:
    transform var(--public-transition),
    box-shadow var(--public-transition);
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--public-shadow);
}

.course-card-cover {
  min-height: 208px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 21px;
}

.course-cover-calculus {
  background:
    linear-gradient(
      145deg,
      #dfe8f1,
      #c7d6e5
    );
}

.course-cover-python {
  background:
    linear-gradient(
      145deg,
      #dce6ec,
      #c4d5df
    );
}

.course-cover-school {
  background:
    linear-gradient(
      145deg,
      #ebe7f3,
      #d9d2e7
    );
}

.course-card-cover-top {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.course-badge,
.course-level {
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 850;
}

.course-level {
  background: rgba(255, 255, 255, 0.66);
  color: var(--public-text-soft);
}

.course-badge-free {
  background: var(--public-green-soft);
  color: var(--public-green);
}

.course-badge-mixed {
  background: var(--public-amber-soft);
  color: var(--public-amber);
}

.course-cover-symbol {
  align-self: flex-end;
  color: rgba(31, 58, 95, 0.7);
  font-size: 4.4rem;
  font-weight: 650;
  line-height: 1;
}

.course-cover-code {
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
  font-size: 3.6rem;
  font-weight: 800;
}

.course-card-body {
  padding: 24px;
}

.course-card-category {
  color: var(--public-primary);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.course-card-body h3 {
  margin: 11px 0 10px;
  font-size: 1.45rem;
  letter-spacing: -0.035em;
}

.course-card-body > p {
  min-height: 78px;
  margin-bottom: 18px;
  color: var(--public-text-soft);
  line-height: 1.65;
}

.course-card-meta {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.course-card-meta span {
  padding: 7px 9px;
  border-radius: 9px;
  background: var(--public-bg-soft);
  color: var(--public-text-muted);
  font-size: 0.71rem;
  font-weight: 750;
}

.course-card-action {
  width: 100%;
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 12px;
  background: var(--public-primary);
  color: white;
  font-size: 0.86rem;
  font-weight: 850;
}

button.course-card-action {
  background: var(--public-bg-soft);
  color: var(--public-text-soft);
}

.course-status-message {
  margin-top: 22px;
  padding: 15px;
  border: 1px solid var(--public-border);
  border-radius: 13px;
  background: var(--public-surface);
  color: var(--public-text-soft);
  text-align: center;
}

/* ==========================================================
   HOW IT WORKS
========================================================== */

.how-section {
  padding: 110px 0;
  background: var(--public-surface);
}

.how-grid {
  display: grid;
  grid-template-columns:
    minmax(0, 0.84fr)
    minmax(520px, 1.16fr);
  gap: 76px;
  align-items: center;
}

.how-steps {
  display: grid;
  gap: 18px;
  margin-top: 35px;
}

.how-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  padding: 17px 0;
  border-bottom: 1px solid var(--public-border);
}

.how-step-number {
  color: var(--public-primary);
  font-size: 0.79rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.how-step h3 {
  margin-bottom: 6px;
  font-size: 1.03rem;
}

.how-step p {
  margin-bottom: 0;
  color: var(--public-text-soft);
  line-height: 1.6;
}

.lesson-preview {
  min-height: 510px;
  display: grid;
  grid-template-columns: 190px 1fr;
  overflow: hidden;
  border: 1px solid var(--public-border);
  border-radius: 27px;
  background: var(--public-surface);
  box-shadow: var(--public-shadow-strong);
}

.lesson-preview-sidebar {
  padding: 25px 18px;
  background: var(--public-surface-dark);
  color: white;
}

.lesson-sidebar-brand {
  margin-bottom: 32px;
  font-size: 1.02rem;
  font-weight: 850;
}

.lesson-sidebar-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
  padding: 11px;
  border-radius: 11px;
  color: #aab4c3;
  font-size: 0.74rem;
  font-weight: 650;
}

.lesson-sidebar-item span {
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.67rem;
}

.lesson-sidebar-item.completed {
  color: #b9d9ca;
}

.lesson-sidebar-item.active {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.lesson-preview-main {
  padding: 42px;
}

.lesson-preview-label {
  color: var(--public-primary);
  font-size: 0.71rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-preview-main h3 {
  margin: 15px 0 12px;
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.lesson-preview-main > p {
  color: var(--public-text-soft);
  line-height: 1.72;
}

.lesson-formula {
  width: fit-content;
  margin: 28px auto;
  padding: 20px 30px;
  border: 1px solid #cfd9e3;
  border-radius: 17px;
  background: #f4f7fa;
  color: var(--public-primary);
  font-family: Georgia, serif;
  font-size: 1.7rem;
}

.formula-sub {
  margin-left: 3px;
  margin-right: 10px;
  font-size: 0.72rem;
  vertical-align: bottom;
}

.lesson-example {
  display: grid;
  gap: 5px;
  padding: 15px 17px;
  border-left: 4px solid var(--public-primary);
  border-radius: 0 12px 12px 0;
  background: var(--public-primary-soft);
}

.lesson-example strong {
  font-size: 0.78rem;
  color: var(--public-primary);
}

.lesson-example span {
  color: var(--public-text-soft);
  font-size: 0.85rem;
}

.lesson-preview-button {
  width: 100%;
  min-height: 47px;
  margin-top: 24px;
  border-radius: 12px;
  background: var(--public-primary);
  color: white;
  font-weight: 850;
}

/* ==========================================================
   CLASSROOM
========================================================== */

.classroom-section {
  padding: 102px 0;
  background: var(--public-bg);
}

.classroom-panel {
  min-height: 510px;
  display: grid;
  grid-template-columns:
    minmax(0, 1fr)
    minmax(430px, 0.85fr);
  gap: 60px;
  align-items: center;
  padding: 58px;
  overflow: hidden;
  border-radius: var(--public-radius-xl);
  background:
    radial-gradient(
      circle at 85% 20%,
      rgba(79, 111, 143, 0.25),
      transparent 30%
    ),
    linear-gradient(
      145deg,
      var(--public-surface-dark),
      var(--public-surface-darker)
    );
  box-shadow: var(--public-shadow-strong);
}

.classroom-panel-copy h2 {
  color: white;
}

.classroom-panel-copy p {
  max-width: 620px;
  color: #b7c1cf;
}

.classroom-panel-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.classroom-panel-actions > span {
  color: #8d99aa;
  font-size: 0.76rem;
}

.classroom-code-card {
  overflow: hidden;
  border: 1px solid var(--public-border-dark);
  border-radius: 20px;
  background: #0d1624;
  box-shadow: 0 30px 65px rgba(0, 0, 0, 0.3);
  transform: rotate(1.5deg);
}

.classroom-code-header {
  min-height: 52px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 17px;
  border-bottom: 1px solid var(--public-border-dark);
  background: #121e2e;
}

.classroom-code-header span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4f5d6d;
}

.classroom-code-header strong {
  margin-left: auto;
  margin-right: auto;
  color: #8692a1;
  font-size: 0.7rem;
  font-weight: 700;
}

.classroom-code-card pre {
  min-height: 235px;
  margin: 0;
  padding: 28px;
  overflow: auto;
  color: #d9e2ed;
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
  font-size: 0.88rem;
  line-height: 1.75;
}

.code-purple {
  color: #c4a7e7;
}

.code-blue {
  color: #84b6e3;
}

.code-green {
  color: #9bcbb1;
}

.classroom-code-output {
  display: grid;
  gap: 6px;
  padding: 18px 26px;
  border-top: 1px solid var(--public-border-dark);
  background: #101b29;
}

.classroom-code-output span {
  color: #6f7f91;
  font-size: 0.67rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.classroom-code-output strong {
  color: #d5e1ec;
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
  font-size: 0.85rem;
}

/* ==========================================================
   TUTORING
========================================================== */

.tutoring-section {
  padding: 110px 0;
  background: var(--public-surface);
}

.tutoring-grid {
  display: grid;
  grid-template-columns:
    minmax(0, 1fr)
    minmax(380px, 0.75fr);
  gap: 72px;
  align-items: center;
}

.tutoring-list {
  display: grid;
  gap: 13px;
  margin: 28px 0 30px;
  padding: 0;
  list-style: none;
}

.tutoring-list li {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--public-text-soft);
  font-weight: 650;
}

.tutoring-list li span {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--public-green-soft);
  color: var(--public-green);
  font-size: 0.73rem;
  font-weight: 900;
}

.tutoring-card {
  padding: 30px;
  border: 1px solid var(--public-border);
  border-radius: var(--public-radius-lg);
  background:
    linear-gradient(
      145deg,
      #f5f7f9,
      #edf1f4
    );
  box-shadow: var(--public-shadow);
}

.tutoring-card-top {
  display: flex;
  justify-content: space-between;
  gap: 13px;
  align-items: center;
}

.tutoring-card-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  background: var(--public-primary);
  color: white;
  font-weight: 850;
}

.tutoring-card-status {
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--public-green-soft);
  color: var(--public-green);
  font-size: 0.69rem;
  font-weight: 850;
}

.tutoring-card h3 {
  margin: 28px 0 11px;
  font-size: 1.6rem;
  letter-spacing: -0.035em;
}

.tutoring-card > p {
  color: var(--public-text-soft);
  line-height: 1.7;
}

.tutoring-card-items {
  display: grid;
  gap: 11px;
  margin-top: 24px;
}

.tutoring-card-items > div {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  padding: 13px 0;
  border-bottom: 1px solid #d8dfe6;
}

.tutoring-card-items strong {
  font-size: 0.82rem;
}

.tutoring-card-items span {
  color: var(--public-text-soft);
  font-size: 0.81rem;
}

/* ==========================================================
   SUPPORT
========================================================== */

.support-section {
  padding: 92px 0;
  background: var(--public-bg);
}

.support-panel {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 38px;
  border: 1px solid var(--public-border);
  border-radius: var(--public-radius-lg);
  background: var(--public-surface);
  box-shadow: var(--public-shadow-soft);
}

.support-icon {
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  border-radius: 21px;
  background: var(--public-amber-soft);
  font-size: 1.9rem;
}

.support-copy h2 {
  margin-top: 10px;
  margin-bottom: 8px;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
}

.support-copy p {
  font-size: 0.96rem;
}

/* ==========================================================
   FOOTER
========================================================== */

.site-footer {
  padding-top: 65px;
  background: var(--public-surface-dark);
  color: white;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.55fr repeat(3, 0.65fr);
  gap: 45px;
  padding-bottom: 54px;
}

.brand-footer .brand-copy span {
  color: #8e9aab;
}

.footer-brand > p {
  max-width: 390px;
  margin: 21px 0 0;
  color: #9ca8b8;
  line-height: 1.7;
}

.footer-column {
  display: grid;
  align-content: start;
  gap: 12px;
}

.footer-column strong {
  margin-bottom: 7px;
  font-size: 0.9rem;
}

.footer-column a,
.footer-column span {
  color: #96a3b4;
  font-size: 0.82rem;
}

.footer-column a:hover {
  color: white;
}

.footer-bottom {
  min-height: 76px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  border-top: 1px solid var(--public-border-dark);
  color: #7f8b9b;
  font-size: 0.76rem;
}

/* ==========================================================
   TOAST
========================================================== */

.public-toast {
  position: fixed;
  left: 50%;
  bottom: 25px;
  z-index: 200;
  max-width: min(90vw, 480px);
  padding: 14px 18px;
  border: 1px solid var(--public-border-dark);
  border-radius: 13px;
  background: var(--public-surface-dark);
  color: white;
  box-shadow: var(--public-shadow-strong);
  font-size: 0.85rem;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 22px);
  transition:
    opacity 200ms ease,
    transform 200ms ease;
}

.public-toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ==========================================================
   RESPONSIVE
========================================================== */

@media (max-width: 1080px) {
  .desktop-navigation {
    display: none;
  }

  .mobile-menu-button {
    display: flex;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }

  .hero-copy {
    max-width: 850px;
  }

  .hero-visual {
    width: min(100%, 660px);
    min-height: auto;
    margin-inline: auto;
  }

  .how-grid,
  .classroom-panel,
  .tutoring-grid {
    grid-template-columns: 1fr;
  }

  .how-grid {
    gap: 52px;
  }

  .classroom-panel {
    gap: 45px;
  }

  .classroom-code-card {
    width: min(100%, 600px);
  }

  .footer-main {
    grid-template-columns: 1.4fr repeat(2, 0.7fr);
  }

  .footer-column:last-child {
    grid-column: 2 / 4;
  }
}

@media (max-width: 860px) {
  .category-grid,
  .course-grid {
    grid-template-columns: 1fr;
  }

  .category-card {
    min-height: 290px;
  }

  .course-card-body > p {
    min-height: auto;
  }

  .lesson-preview {
    grid-template-columns: 155px 1fr;
  }

  .support-panel {
    grid-template-columns: auto 1fr;
  }

  .support-panel .button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-column:last-child {
    grid-column: auto;
  }
}

@media (max-width: 680px) {
  .public-container {
    width: min(calc(100% - 28px), var(--public-max-width));
  }

  .header-inner {
    min-height: 72px;
  }

  .brand-symbol {
    width: 40px;
    height: 40px;
  }

  .brand-copy span {
    display: none;
  }

  .classroom-link {
    display: none;
  }

  .hero-section {
    padding: 128px 0 72px;
  }

  .hero-copy h1 {
    font-size: clamp(2.75rem, 15vw, 4rem);
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-actions {
    display: grid;
  }

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

  .hero-benefits {
    display: grid;
    gap: 12px;
  }

  .hero-visual {
    width: 100%;
  }

  .course-preview-card {
    transform: none;
  }

  .course-preview-content {
    padding: 21px;
  }

  .floating-card-code {
    display: none;
  }

  .floating-card-progress {
    position: relative;
    right: auto;
    bottom: auto;
    max-width: none;
    margin-top: 15px;
    transform: none;
  }

  .categories-section,
  .courses-section,
  .how-section,
  .tutoring-section {
    padding: 78px 0;
  }

  .section-heading-row {
    display: grid;
    align-items: start;
  }

  .text-button {
    justify-self: start;
  }

  .lesson-preview {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .lesson-preview-sidebar {
    display: none;
  }

  .lesson-preview-main {
    padding: 26px;
  }

  .lesson-formula {
    padding: 17px 20px;
    font-size: 1.35rem;
  }

  .classroom-section {
    padding: 74px 0;
  }

  .classroom-panel {
    min-height: auto;
    padding: 30px 22px;
  }

  .classroom-panel-actions {
    align-items: stretch;
  }

  .classroom-panel-actions .button {
    width: 100%;
  }

  .classroom-panel-actions > span {
    width: 100%;
    text-align: center;
  }

  .classroom-code-card {
    transform: none;
  }

  .classroom-code-card pre {
    padding: 21px;
    font-size: 0.74rem;
  }

  .support-section {
    padding: 70px 0;
  }

  .support-panel {
    grid-template-columns: 1fr;
    padding: 28px 22px;
    text-align: center;
  }

  .support-icon,
  .support-copy .section-kicker {
    margin-inline: auto;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .footer-brand,
  .footer-column:last-child {
    grid-column: auto;
  }

  .footer-bottom {
    min-height: 100px;
    display: grid;
    justify-content: start;
    align-content: center;
  }
}

@media (max-width: 420px) {
  .hero-copy h1 {
    font-size: 2.65rem;
  }

  .course-preview-header {
    grid-template-columns: 70px 1fr 70px;
  }

  .preview-course-top {
    display: grid;
    justify-content: start;
  }

  .preview-module {
    grid-template-columns: 32px 1fr;
  }

  .preview-module-state {
    display: none;
  }

  .category-card,
  .course-card-body,
  .tutoring-card {
    padding: 22px;
  }

  .classroom-code-card pre {
    font-size: 0.67rem;
  }

  .tutoring-card-top {
    align-items: flex-start;
  }
}