:root {
  --ink: #1c1917;
  --ink-soft: #44403c;
  --muted: #78716c;
  --line: rgba(28, 25, 23, 0.12);
  --crane: #2c5aa0;
  --crane-deep: #1e4080;
  --crane-soft: #d4e4f7;
  --indigo: #2c3e6b;
  --indigo-soft: #d8e0f0;
  --gold: #c9a227;
  --paper: #f7f3eb;
  --paper-deep: #ebe4d6;
  --white: #fffcf7;
  --success: #2d6a4f;
  --error: #1e40af;
  --nav-bg: rgba(255, 252, 247, 0.88);
  --shell: min(1080px, calc(100% - 2.5rem));
  --display: "DM Serif Display", Georgia, serif;
  --sans: "Outfit", system-ui, sans-serif;
  --jp: "Zen Kaku Gothic New", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 18px 50px rgba(28, 25, 23, 0.08);
}

[data-theme="dark"] {
  --ink: #f5f0e8;
  --ink-soft: #c8c0b4;
  --muted: #9a9288;
  --line: rgba(245, 240, 232, 0.14);
  --crane: #7eb0e8;
  --crane-deep: #a8c8f0;
  --crane-soft: #1a2f4d;
  --indigo: #9aafd4;
  --indigo-soft: #1e2a3d;
  --gold: #e0b84a;
  --paper: #141210;
  --paper-deep: #1c1917;
  --white: #1f1c19;
  --success: #6ee7b7;
  --error: #93c5fd;
  --nav-bg: rgba(20, 18, 16, 0.92);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .atmosphere {
  background:
    radial-gradient(900px 500px at 0% 0%, rgba(44, 90, 160, 0.18), transparent 55%),
    radial-gradient(700px 420px at 100% 10%, rgba(44, 62, 107, 0.16), transparent 55%),
    linear-gradient(180deg, #1a1714 0%, var(--paper) 50%, #12100e 100%);
}

[data-theme="dark"] .atmosphere__folds {
  background-image:
    linear-gradient(135deg, transparent 48%, rgba(245, 240, 232, 0.04) 49%, transparent 51%),
    linear-gradient(45deg, transparent 48%, rgba(245, 240, 232, 0.03) 49%, transparent 51%);
}

[data-theme="dark"] .modal::backdrop {
  background: rgba(0, 0, 0, 0.65);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.55;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1 1 auto;
}

a {
  color: var(--crane);
  text-underline-offset: 0.18em;
}

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

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

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.shell--narrow {
  width: min(720px, calc(100% - 2.5rem));
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(900px 500px at 0% 0%, rgba(44, 90, 160, 0.1), transparent 55%),
    radial-gradient(700px 420px at 100% 10%, rgba(44, 62, 107, 0.1), transparent 55%),
    linear-gradient(180deg, #faf6ef 0%, var(--paper) 50%, #f0ebe1 100%);
}

.atmosphere__folds {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(135deg, transparent 48%, rgba(28, 25, 23, 0.04) 49%, transparent 51%),
    linear-gradient(45deg, transparent 48%, rgba(28, 25, 23, 0.03) 49%, transparent 51%);
  background-size: 120px 120px, 80px 80px;
}

.crane {
  position: absolute;
  width: 48px;
  height: 32px;
  background: var(--crane);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
  opacity: 0.12;
  animation: drift 18s ease-in-out infinite;
}

.crane--1 { top: 12%; left: 8%; animation-delay: 0s; }
.crane--2 { top: 28%; right: 12%; width: 36px; height: 24px; animation-delay: -6s; }
.crane--3 { bottom: 20%; left: 20%; width: 56px; height: 38px; animation-delay: -12s; }

@keyframes drift {
  0%, 100% { transform: translateY(0) rotate(-8deg); }
  50% { transform: translateY(-12px) rotate(4deg); }
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav__brand__text {
  text-decoration: none;
  color: inherit;
}

.nav__brand__text:hover {
  color: var(--crane-deep);
}

.nav__mark {
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 0.35rem;
  background: var(--crane);
  color: var(--white);
  font-family: var(--jp);
  font-size: 0.95rem;
  font-weight: 700;
}

.nav__mark--gear {
  font-family: inherit;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.15s ease;
}

a.nav__mark--gear:hover {
  background: var(--crane-deep);
  transform: translateY(-1px);
}

body[data-signed-in="true"] #nav-mark,
body[data-signed-in="true"] .nav__mark:not(.nav__mark--gear) {
  display: none !important;
}

.nav__mark-icon {
  display: block;
  width: 1rem;
  height: 1rem;
}

.nav__links {
  display: flex;
  gap: 0.35rem;
  margin-left: auto;
}

.nav__links a {
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.9rem;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.nav__links a:hover,
.nav__links a[aria-current="page"] {
  background: var(--crane-soft);
  color: var(--crane-deep);
}

.nav__tutor {
  flex-shrink: 0;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  border: none;
  background: var(--crane);
  color: var(--white);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.nav__tutor:hover,
.nav__tutor--active {
  background: var(--crane-deep);
  transform: translateY(-1px);
}

.login-divider {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.login-subtitle {
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  line-height: 1.1;
}

.auth-google {
  margin-bottom: 0.25rem;
}

.auth-social {
  display: grid;
  gap: 0.75rem;
}

.btn--google,
.btn--microsoft,
.btn--discord {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: #fff;
  color: #1f1f1f;
  border: 1px solid var(--line);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.06);
}

.btn--discord {
  background: #5865f2;
  color: #fff;
  border-color: #5865f2;
}

.btn--google:hover,
.btn--microsoft:hover {
  background: #f8f8f8;
  transform: translateY(-1px);
}

.btn--discord:hover {
  background: #4752c4;
  transform: translateY(-1px);
}

.btn--google__icon,
.btn--microsoft__icon,
.btn--discord__icon {
  display: inline-flex;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.25rem 0 1.5rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.auth-divider span {
  white-space: nowrap;
}

/* Hero */
.hero {
  padding: 3.5rem 0 4rem;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--crane);
}

.hero__title,
.page-form h1,
.section h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero__title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
}

.hero__lede,
.page-form__lede {
  margin: 1rem 0 0;
  max-width: 38ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.2rem;
  border: none;
  border-radius: 999px;
  background: var(--crane);
  color: var(--white);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn:hover {
  background: var(--crane-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: none;
}

.btn--ghost:hover {
  background: var(--white);
  border-color: rgba(28, 25, 23, 0.2);
}

.hero__stats {
  display: flex;
  gap: 2rem;
  margin: 2.25rem 0 0;
  padding: 0;
}

.hero__stats div {
  min-width: 0;
}

.hero__stats dt {
  font-family: var(--display);
  font-size: 1.6rem;
  color: var(--indigo);
}

.hero__stats dd {
  margin: 0.15rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.hero__visual {
  position: relative;
  min-height: 320px;
}

.fold-card {
  position: absolute;
  border-radius: 1rem;
  background: var(--white);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  overflow: hidden;
}

.fold-card--main {
  inset: 10% 8% 10% 18%;
  transform: rotate(-4deg);
}

.fold-card--star {
  top: 4%;
  right: 0;
  width: 38%;
  aspect-ratio: 1;
  transform: rotate(8deg);
}

.fold-card--heart {
  bottom: 0;
  left: 0;
  width: 34%;
  aspect-ratio: 1;
  transform: rotate(-10deg);
}

.fold-card__paper {
  height: 70%;
  background:
    linear-gradient(135deg, var(--crane) 0%, #4a7cc9 50%, var(--crane-deep) 100%);
  clip-path: polygon(50% 8%, 92% 88%, 8% 88%);
}

.fold-card--star .fold-card__paper {
  background: linear-gradient(135deg, var(--gold), #e8c56a);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

.fold-card--heart .fold-card__paper {
  background: linear-gradient(135deg, #7eb0e8, var(--crane-soft));
  clip-path: polygon(50% 18%, 88% 8%, 88% 48%, 50% 92%, 12% 48%, 12% 8%);
}

.fold-card__label {
  margin: 0;
  padding: 0.75rem 1rem;
  font-family: var(--jp);
  font-size: 0.85rem;
  color: var(--muted);
}

/* Sections */
.section {
  padding: 3rem 0 4rem;
}

.section--accent {
  background: rgba(255, 255, 255, 0.55);
  border-block: 1px solid var(--line);
}

.section__head {
  margin-bottom: 2rem;
}

.section h2,
.page-form h1 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.section__cta {
  margin-top: 2rem;
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  padding: 1.5rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.steps__num {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.75rem;
  border-radius: 50%;
  background: var(--indigo-soft);
  color: var(--indigo);
  font-weight: 600;
  font-size: 0.9rem;
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Course cards */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.course-card {
  display: flex;
  flex-direction: column;
  padding: 1.35rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(28, 25, 23, 0.04);
}

.course-card__badge {
  align-self: flex-start;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--indigo-soft);
  color: var(--indigo);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.course-card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 400;
}

.course-card__meta {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.course-card p {
  margin: 0 0 1rem;
  flex: 1;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.course-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: auto;
}

.course-card__free {
  font-weight: 600;
  color: var(--success);
}

.course-card__spots {
  font-size: 0.82rem;
  color: var(--muted);
}

.course-card .btn {
  width: 100%;
  margin-top: 0.75rem;
}

/* Forms */
.page-form {
  padding: 2.5rem 0 4rem;
}

.page-form__head {
  margin-bottom: 2rem;
}

.form {
  display: grid;
  gap: 1.5rem;
}

.form__section {
  margin: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--white);
}

.form__section legend {
  padding: 0 0.35rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  margin-top: 1rem;
}

.field span {
  font-size: 0.88rem;
  font-weight: 500;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--paper);
  color: var(--ink);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid rgba(44, 90, 160, 0.35);
  border-color: var(--crane);
}

.form__hint {
  font-weight: 400;
  color: var(--muted);
}

.checkbox {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.checkbox input {
  margin-top: 0.2rem;
}

.form__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.settings-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.settings-section {
  margin-top: 1.5rem;
}

.settings-section--danger {
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.btn--danger {
  background: #9b1c1c;
  color: #fff;
}

.btn--danger:hover {
  background: #7f1515;
}

.settings-section h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.settings-section__lede {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.theme-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.theme-option {
  position: relative;
  display: block;
  cursor: pointer;
}

.theme-option input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.theme-option span {
  display: block;
  padding: 0.75rem 0.85rem;
  border-radius: 0.75rem;
  border: 1px solid var(--line);
  background: var(--white);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.theme-option input:checked + span {
  border-color: var(--crane);
  background: var(--crane-soft);
  color: var(--crane-deep);
}

.theme-option input:focus-visible + span {
  outline: 2px solid rgba(44, 90, 160, 0.35);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.form__status {
  margin: 0;
  min-height: 1.25rem;
  font-size: 0.9rem;
}

.form__status--success { color: var(--success); }
.form__status--error { color: var(--error); }

.enroll-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding: 0.9rem 1.1rem;
  border-radius: 0.75rem;
  background: var(--indigo-soft);
  color: var(--indigo);
  font-size: 0.92rem;
}

.enroll-banner a {
  color: var(--indigo);
  font-weight: 500;
}

.lookup__row {
  display: flex;
  gap: 0.5rem;
}

.lookup__row input {
  flex: 1;
}

.profile-card {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.profile-card h2 {
  margin: 0 0 0.75rem;
  font-family: var(--display);
  font-weight: 400;
}

.profile-card__meta {
  display: grid;
  gap: 0.5rem;
  margin: 0;
}

.profile-card__meta div {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.5rem;
}

.profile-card__meta dt {
  color: var(--muted);
  font-size: 0.85rem;
}

.profile-card__meta dd {
  margin: 0;
  font-size: 0.92rem;
}

.enrollment-list h3 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.enrollment-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 0.75rem;
  background: var(--white);
  border: 1px solid var(--line);
  margin-bottom: 0.75rem;
}

.enrollment-item__body {
  flex: 1;
  min-width: 0;
}

.enrollment-item__cancel {
  flex-shrink: 0;
}

.btn--small {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
}

.enrollment-item h4 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.enrollment-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.empty {
  padding: 1.5rem;
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  text-align: center;
}

/* Modal */
.modal {
  width: min(480px, calc(100% - 2rem));
  padding: 0;
  border: none;
  border-radius: 1rem;
  background: transparent;
}

.modal::backdrop {
  background: rgba(28, 25, 23, 0.45);
  backdrop-filter: blur(4px);
}

.modal__inner {
  position: relative;
  padding: 1.5rem;
  border-radius: 1rem;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.modal__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 50%;
  background: var(--paper);
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.modal h2 {
  margin: 0 0 0.35rem;
  font-family: var(--display);
  font-weight: 400;
}

.modal__meta {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.modal__note {
  margin: 0 0 1.25rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background: rgba(44, 90, 160, 0.08);
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Footer */
.footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.footer__brand {
  margin: 0;
  font-family: var(--display);
  font-size: 1.05rem;
}

.footer__meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.footer__meta a {
  color: var(--ink-soft);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 900px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }

  .hero__visual {
    min-height: 240px;
  }

  .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav__links {
    display: none;
  }

  .nav__tutor {
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
  }

  .form__row {
    grid-template-columns: 1fr;
  }

  .hero__stats {
    gap: 1.25rem;
  }
}