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

:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-border: #ebe8e3;
  --color-accent: #c9a98a;
  --color-accent-light: #f5ede4;
  --color-text: #1a1a1a;
  --color-text-muted: #7a7370;
  --color-error: #c0392b;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
}

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

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header__logo {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.header__right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header__email {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.header__logout {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 500;
  transition: opacity 0.2s;
}

.header__logout:hover { opacity: 0.7; }

/* ===== Main ===== */
.main {
  flex: 1;
  padding: 40px 0 60px;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== Login page ===== */
.login-page {
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-wrap {
  width: 100%;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 36px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.login-logo {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.login-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 28px;
}

.login-error {
  background: #fdf2f2;
  border: 1px solid #f5c6c6;
  color: var(--color-error);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.875rem;
  margin-bottom: 20px;
}

.login-form { display: flex; flex-direction: column; gap: 18px; }

/* ===== Form ===== */
.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 11px 14px;
  font-size: 0.95rem;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus { border-color: var(--color-accent); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: opacity 0.2s, transform 0.1s;
  text-decoration: none;
}

.btn:active { transform: scale(0.98); }
.btn:hover { opacity: 0.88; }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--full { width: 100%; margin-top: 4px; }

.btn--download {
  background: var(--color-accent-light);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  margin-top: 12px;
  font-size: 0.875rem;
}

/* ===== Cabinet ===== */
.cabinet__welcome {
  margin-bottom: 36px;
}

.cabinet__welcome h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.cabinet__subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.blocks-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 540px) {
  .blocks-grid { grid-template-columns: 1fr 1fr; }
}

.block-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: box-shadow 0.2s, border-color 0.2s;
  position: relative;
}

.block-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-accent);
}

.block-card__num {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.block-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
}

.block-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.block-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: auto;
  padding-top: 12px;
}

.block-card__arrow {
  position: absolute;
  top: 24px;
  right: 24px;
  color: var(--color-accent);
  font-size: 1.1rem;
}

/* ===== Block page ===== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  transition: color 0.2s;
}

.back-link:hover { color: var(--color-accent); }

.block-page__title {
  font-size: 1.6rem;
  font-weight: 600;
  margin-bottom: 32px;
  line-height: 1.3;
}

/* ===== Video ===== */
.video-wrap {
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  margin-bottom: 28px;
}

.video-wrap video {
  width: 100%;
  display: block;
  max-height: 480px;
}

/* ===== Audio ===== */
.audio-wrap {
  margin: 24px 0;
}

.audio-wrap audio {
  width: 100%;
  border-radius: 8px;
}

/* ===== Block 0 caption ===== */
.block-caption {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.block-caption p { margin-bottom: 8px; }
.block-caption br { display: block; content: ''; margin-bottom: 8px; }
.block-caption .bullet { padding-left: 8px; }
.block-caption .block-ref { margin-top: 16px; }

/* ===== Lessons ===== */
.lessons { display: flex; flex-direction: column; gap: 52px; }

.lesson { }

.lesson__title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

/* ===== Lesson text ===== */
.lesson__text { }

.lesson__text--spaced { margin-top: 28px; }

.lesson__subheading {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 2px;
}

.lesson__text p {
  margin-bottom: 10px;
  font-size: 0.95rem;
  line-height: 1.75;
}

.lesson__text p:last-child { margin-bottom: 0; }

.lesson__text .bullet {
  padding-left: 8px;
  color: var(--color-text);
}

.lesson__text hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 24px 0;
}

/* ===== Lesson image ===== */
.lesson__image-wrap {
  margin-top: 28px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.lesson__image {
  width: 100%;
  object-fit: cover;
}

/* ===== Lesson cards (block page) ===== */
.lessons-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lesson-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: box-shadow 0.2s, border-color 0.2s;
  position: relative;
}

.lesson-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-accent);
}

.lesson-card__num {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  min-width: 56px;
}

.lesson-card__title {
  font-size: 1rem;
  font-weight: 500;
  flex: 1;
}

.lesson-card__arrow {
  color: var(--color-accent);
  font-size: 1.1rem;
}

/* ===== Lesson nav header ===== */
.lesson-nav-header {
  margin-bottom: 32px;
}

.lesson-nav-header__num {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  display: block;
  margin-bottom: 6px;
}

.lesson-nav-header .block-page__title { margin-bottom: 0; }

/* ===== Next block link ===== */
.next-block-link {
  display: block;
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--color-accent-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  text-align: center;
  transition: opacity 0.2s;
}
.next-block-link:hover { opacity: 0.8; }

/* ===== Lesson navigation (prev/next) ===== */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  gap: 16px;
}

.lesson-nav__btn {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  transition: opacity 0.2s;
  max-width: 48%;
}

.lesson-nav__btn:hover { opacity: 0.7; }
.lesson-nav__btn--next { text-align: right; }

/* ===== Mobile ===== */
@media (max-width: 480px) {
  .login-box { padding: 28px 20px; }
  .block-page__title { font-size: 1.3rem; }
  .cabinet__welcome h1 { font-size: 1.4rem; }
  .block-caption { padding: 20px; }
  .header__email { display: none; }
}