/* ==========================================================================
   home-1.css - homepage part 1: hero, hero-media, logo-marquee, problems,
   platform-features, quizzes, content-studio, ai-course-studio, always-current.
   One block per section ID; classes are prefixed with the section ID.
   Design values come from tokens.css; fixed px sizes from specs/SECTIONS.md.
   ========================================================================== */

/* ---- hero ---------------------------------------------------------------- */
.hero {
  padding: clamp(100px, 14vw, 180px) var(--gutter) 0;
  display: flex; flex-direction: column; align-items: center; text-align: center;
}
.hero__eyebrow { margin: 0 0 28px; }
.hero__title { font-size: var(--fs-display); line-height: 1.05; letter-spacing: -.035em; max-width: 980px; }
.hero__body { font-size: var(--fs-lead); line-height: 1.45; color: var(--text-secondary); max-width: 600px; margin-top: 32px; }
.hero__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 48px; }

/* ---- hero-media ---------------------------------------------------------- */
.hero-media { padding-top: clamp(80px, 10vw, 120px); }
.hero-media__panel {
  border-radius: var(--radius-panel); background: var(--color-surface); overflow: hidden;
  padding: clamp(32px, 6vw, 80px) clamp(32px, 6vw, 80px) 0;
}
.hero-media__frame {
  aspect-ratio: 16 / 9; border-radius: var(--radius-m) var(--radius-m) 0 0;
  box-shadow: var(--shadow-hero-media);
}

/* ---- logo-marquee -------------------------------------------------------- */
.logo-marquee { padding-top: 96px; }
.logo-marquee__mask {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, var(--color-ink) 12%, var(--color-ink) 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, var(--color-ink) 12%, var(--color-ink) 88%, transparent);
}
.logo-marquee__track {
  display: flex; width: max-content;
  animation: logoscroll 40s linear infinite;
}
.logo-marquee__track:hover { animation-play-state: paused; }
.logo-marquee__list {
  display: flex; margin: 0; padding: 0; list-style: none;
  font-size: 20px; font-weight: var(--fw-semibold); letter-spacing: -.02em;
  color: var(--text-logo); white-space: nowrap;
}
.logo-marquee__list li { flex: none; padding-right: clamp(48px, 6vw, 88px); }
@media (prefers-reduced-motion: reduce) {
  .logo-marquee__track { animation: none; }
}

/* ---- problems ------------------------------------------------------------ */
.problems {
  padding-block: var(--section-y-lg);
  display: flex; flex-direction: column; gap: 96px;
}
.problems__title { max-width: 920px; }
.problems__title-muted { color: var(--text-muted); }
.problems__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 64px; }
.problems__item {
  display: flex; flex-direction: column; gap: 14px;
  border-top: 1px solid var(--border-rule); padding-top: 28px;
}
.problems__item h3 { font-size: 21px; letter-spacing: -.01em; }
.problems__item p { font-size: 17px; line-height: 1.55; color: var(--text-secondary); }

/* ---- platform-features --------------------------------------------------- */
.platform-features { background: var(--color-surface); }
.platform-features__inner {
  padding-block: var(--section-y);
  display: flex; flex-direction: column; gap: var(--section-y);
}
.platform-features__item { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 24px; }
.platform-features__title { max-width: 820px; }
.platform-features__body { font-size: var(--fs-body-l); line-height: 1.5; color: var(--text-secondary); max-width: 560px; }
.platform-features__media {
  width: 100%; margin-top: 56px; aspect-ratio: 16 / 9;
  border-radius: var(--radius-card-m); box-shadow: var(--shadow-feature-media);
}

/* ---- quizzes ------------------------------------------------------------- */
.quizzes {
  padding-top: var(--section-y);
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr));
  gap: clamp(48px, 7vw, 96px); align-items: center;
}
.quizzes__intro { display: flex; flex-direction: column; gap: 24px; }
.quizzes__body { font-size: var(--fs-body-m); line-height: 1.55; color: var(--text-secondary); max-width: 460px; }
.quizzes__steps { display: flex; flex-direction: column; gap: 14px; margin: 8px 0 0; padding: 0; list-style: none; }
.quizzes__steps li { display: flex; gap: 14px; align-items: baseline; font-size: 17px; }
.quizzes__step-n { flex: none; width: 24px; font-size: 14px; color: var(--text-tertiary); }

.quizzes__panel {
  border-radius: var(--radius-panel); background: var(--color-surface);
  padding: clamp(28px, 4vw, 48px); display: flex; flex-direction: column; gap: 16px;
}
.quizzes__file {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px;
  border-radius: var(--radius-m); background: var(--color-white); box-shadow: var(--shadow-hairline);
}
.quizzes__badge {
  flex: none; width: 40px; height: 48px; border-radius: var(--radius-tiny); background: var(--color-surface);
  display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: var(--fw-semibold);
}
.quizzes__file-text { flex: 1; min-width: 0; }
.quizzes__file-name { font-size: 15px; font-weight: var(--fw-medium); }
.quizzes__file-meta { font-size: 13px; color: var(--text-secondary); }

.quizzes__card {
  border-radius: var(--radius-inner); background: var(--color-white); box-shadow: var(--shadow-card);
  padding: 28px; display: flex; flex-direction: column; gap: 18px;
}
.quizzes__card-top { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-secondary); }
.quizzes__progress { height: 4px; border-radius: var(--radius-pill); background: var(--color-surface); }
.quizzes__progress-fill { width: 33%; height: 100%; border-radius: var(--radius-pill); background: var(--color-ink); }
.quizzes__question { font-size: 21px; line-height: 1.3; letter-spacing: -.01em; }
.quizzes__options { display: flex; flex-direction: column; gap: 10px; }
.quizzes__option {
  display: flex; justify-content: space-between; align-items: center; gap: 12px; text-align: left;
  font-size: 16px; padding: 14px 18px; border-radius: var(--radius-s);
  border: 1px solid var(--border-strong); background: var(--color-white); color: var(--text-primary); cursor: pointer;
}
.quizzes__option[aria-disabled="true"] { cursor: default; }
.quizzes__option.is-correct { background: var(--color-ink); color: var(--color-white); border-color: var(--border-rule); }
.quizzes__option.is-wrong { border-color: var(--border-rule); }
.quizzes__mark { flex: none; font-size: 14px; }
/* An unrevealed mark keeps its empty flex slot (as in the reference), so the option text wraps the same. */
.quizzes__option:not(.is-correct):not(.is-wrong) .quizzes__mark { width: 0; height: 0; overflow: hidden; visibility: hidden; }
.quizzes__source { font-size: 13px; color: var(--text-secondary); }

/* ---- content-studio ------------------------------------------------------ */
.content-studio { padding-top: var(--section-y); display: flex; flex-direction: column; gap: 64px; }
.content-studio__header { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 22px; }
.content-studio__title { max-width: 760px; }
.content-studio__body { font-size: var(--fs-body-m); line-height: 1.55; color: var(--text-secondary); max-width: 580px; }

.content-studio__panel { border-radius: var(--radius-panel); background: var(--color-surface); padding: clamp(20px, 4vw, 48px); }
.content-studio__window {
  border-radius: var(--radius-inner); background: var(--color-white); overflow: hidden;
  box-shadow: var(--shadow-feature-media);
}
.content-studio__bar {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 16px 22px; border-bottom: 1px solid var(--border-subtle);
}
.content-studio__doc { display: flex; align-items: center; gap: 12px; }
.content-studio__doc-title { font-size: 15px; font-weight: var(--fw-medium); }
.content-studio__status {
  font-size: 12px; padding: 4px 10px; border-radius: var(--radius-pill);
  background: var(--color-surface); color: var(--text-secondary);
}
.content-studio__actions { display: flex; gap: 8px; }
.content-studio__pill { font-size: 14px; padding: 9px 16px; border-radius: var(--radius-pill); border: 1px solid var(--border-medium); }
.content-studio__pill--primary { background: var(--color-ink); color: var(--color-white); border-color: var(--border-rule); }

.content-studio__body-row { display: flex; flex-wrap: wrap; }
.content-studio__label { font-size: 12px; color: var(--text-tertiary); }
.content-studio__formats {
  flex: 0 0 180px; padding: 22px 16px; border-right: 1px solid var(--border-subtle);
  display: flex; flex-direction: column; gap: 4px; font-size: 14px;
}
.content-studio__formats-label { padding: 0 10px 8px; }
.content-studio__format { padding: 9px 10px; color: var(--text-secondary); }
.content-studio__format--active {
  border-radius: var(--radius-thumb); background: var(--color-surface);
  color: var(--text-primary); font-weight: var(--fw-medium);
}

.content-studio__canvas {
  flex: 1 1 360px; min-width: 0; padding: clamp(22px, 3vw, 36px);
  display: flex; flex-direction: column; gap: 18px;
}
.content-studio__cover { aspect-ratio: 21 / 8; border-radius: var(--radius-s); }
.content-studio__heading { font-size: 26px; letter-spacing: -.02em; }
.content-studio__text { font-size: 15px; line-height: 1.6; color: var(--text-strong); max-width: 520px; }
.content-studio__video {
  display: flex; align-items: center; gap: 14px; padding: 12px 14px;
  border-radius: var(--radius-s); border: 1px solid var(--border-subtle);
}
.content-studio__video-thumb {
  flex: none; width: 56px; height: 40px; border-radius: var(--radius-tiny);
  background: var(--color-ink); color: var(--color-white);
  display: flex; align-items: center; justify-content: center; font-size: 12px;
}
.content-studio__video-text { min-width: 0; }
.content-studio__video-title { font-size: 14px; font-weight: var(--fw-medium); }
.content-studio__video-meta { font-size: 13px; color: var(--text-secondary); }
.content-studio__add {
  align-self: flex-start; font-size: 14px; color: var(--text-secondary); padding: 9px 14px;
  border-radius: var(--radius-thumb); border: 1px dashed var(--border-dashed);
}

.content-studio__settings {
  flex: 0 1 260px; padding: 22px; border-left: 1px solid var(--border-subtle);
  display: flex; flex-direction: column; gap: 20px; font-size: 14px;
}
.content-studio__setting { display: flex; flex-direction: column; gap: 6px; }
.content-studio__setting--chips { gap: 8px; }
.content-studio__chips { display: flex; flex-wrap: wrap; gap: 6px; }
.content-studio__chips span { padding: 5px 10px; border-radius: var(--radius-pill); background: var(--color-surface); }

.content-studio__features { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 40px; }
.content-studio__feature {
  display: flex; flex-direction: column; gap: 10px;
  border-top: 1px solid var(--border-rule); padding-top: 24px;
}
.content-studio__feature h3 { font-size: 19px; letter-spacing: -.01em; }
.content-studio__feature p { font-size: 16px; line-height: 1.55; color: var(--text-secondary); }

/* content-studio compact (< 1000px): formats become one scrolling row, settings hidden. */
@media (max-width: 999.98px) {
  .content-studio__formats {
    flex: 1 1 100%; flex-direction: row; gap: 6px; overflow-x: auto; scrollbar-width: none;
    padding: 14px 16px; border-right: 0; border-bottom: 1px solid var(--border-subtle); white-space: nowrap;
  }
  .content-studio__formats::-webkit-scrollbar { display: none; }
  .content-studio__formats-label { display: none; }
  .content-studio__format { flex: none; padding: 8px 14px; }
  .content-studio__format--active { border-radius: var(--radius-pill); }
  .content-studio__settings { display: none; }
}

/* ---- ai-course-studio ---------------------------------------------------- */
.ai-course-studio { padding-top: var(--section-y); }
.ai-course-studio__panel {
  border-radius: var(--radius-panel); background: var(--dark-bg); color: var(--color-white);
  padding: clamp(56px, 8vw, 104px) clamp(28px, 6vw, 80px);
  display: flex; flex-direction: column; gap: 64px;
}
.ai-course-studio__header { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 22px; }
.ai-course-studio__eyebrow { color: var(--dark-text-secondary); }
.ai-course-studio__title { font-size: var(--fs-studio-title); line-height: 1.06; letter-spacing: -.03em; max-width: 760px; }
.ai-course-studio__body { font-size: var(--fs-body-m); line-height: 1.55; color: var(--dark-text-secondary); max-width: 560px; }

.ai-course-studio__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 20px; }
.ai-course-studio__card {
  border-radius: var(--radius-card-m); background: var(--dark-panel); padding: 28px;
  display: flex; flex-direction: column; gap: 20px;
}
.ai-course-studio__label { font-size: 14px; color: var(--dark-text-secondary); }
.ai-course-studio__tag {
  align-self: flex-start; font-size: 13px; padding: 6px 12px; border-radius: var(--radius-pill);
  background: var(--dark-raised); color: var(--dark-text-soft);
}
.ai-course-studio__desc { flex: 1; display: flex; flex-direction: column; gap: 10px; }
.ai-course-studio__desc-title { font-size: 18px; font-weight: var(--fw-medium); }
.ai-course-studio__desc-text { font-size: 15px; line-height: 1.55; color: var(--dark-text-body); }

.ai-course-studio__images { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.ai-course-studio__image { aspect-ratio: 1; border-radius: var(--radius-xs); background: var(--dark-raised); }
.ai-course-studio__image--pending {
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; color: var(--dark-text-secondary);
}

.ai-course-studio__thumb {
  flex: 1; min-height: 180px; border-radius: var(--radius-m); background: var(--dark-raised);
}
.ai-course-studio__thumb::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, color-mix(in srgb, var(--color-ink) 75%, transparent), transparent 60%);
}
.ai-course-studio__thumb-text {
  position: absolute; z-index: 1; left: 16px; right: 16px; bottom: 14px;
  display: flex; flex-direction: column; gap: 4px;
}
.ai-course-studio__thumb-meta { font-size: 12px; color: var(--dark-text-soft); }
.ai-course-studio__thumb-title { font-size: 17px; font-weight: var(--fw-medium); }
.ai-course-studio__cta { display: flex; justify-content: center; }

/* ---- always-current ------------------------------------------------------ */
.always-current { padding-top: var(--section-y); display: flex; flex-direction: column; gap: 72px; }
.always-current__top {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr));
  gap: 40px; align-items: end;
}
.always-current__heading { display: flex; flex-direction: column; gap: 22px; }
.always-current__body { font-size: var(--fs-body-m); line-height: 1.55; color: var(--text-secondary); }

.always-current__steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 20px; }
.always-current__step {
  border-radius: var(--radius-card); background: var(--color-surface); padding: 32px;
  display: flex; flex-direction: column; gap: 28px;
}
.always-current__step-text { display: flex; flex-direction: column; gap: 8px; }
.always-current__n { font-size: 14px; color: var(--text-tertiary); }
.always-current__step-text h3 { font-size: 21px; letter-spacing: -.01em; }
.always-current__step-text p { font-size: 15px; line-height: 1.55; color: var(--text-secondary); }

.always-current__card {
  border-radius: var(--radius-m); background: var(--color-white); padding: 16px;
  box-shadow: var(--shadow-hairline); display: flex; flex-direction: column;
}
.always-current__card--alert { gap: 6px; }
.always-current__card--approval { gap: 10px; }
.always-current__card--notification { flex-direction: row; align-items: center; gap: 12px; padding: 14px 16px; }
.always-current__meta { font-size: 12px; color: var(--text-secondary); }
.always-current__card-title { font-size: 15px; font-weight: var(--fw-medium); }
.always-current__sub { font-size: 13px; color: var(--text-secondary); }

.always-current__approval-row { display: flex; justify-content: space-between; font-size: 13px; }
.always-current__approval-row .always-current__card-title { font-size: 13px; }
.always-current__draft { color: var(--text-secondary); }
.always-current__approval-actions { display: flex; gap: 6px; }
.always-current__approve, .always-current__edit {
  flex: 1; font-size: 12px; text-align: center; padding: 7px; border-radius: var(--radius-pill);
}
.always-current__approve { background: var(--color-ink); color: var(--color-white); }
.always-current__edit { border: 1px solid var(--border-strong); }

.always-current__icon {
  flex: none; width: 36px; height: 36px; border-radius: var(--radius-thumb);
  background: var(--color-ink); color: var(--color-white);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: var(--fw-semibold);
}
.always-current__notification-text { flex: 1; min-width: 0; }
.always-current__card--notification .always-current__card-title { font-size: 14px; }

.always-current__proof {
  margin: 0; padding: 32px 0 0; list-style: none; border-top: 1px solid var(--border-default);
  display: flex; flex-wrap: wrap; gap: 20px 56px; font-size: 16px;
}