/* ============================================================
   GUIDE PAGE STYLES — shared across Core Series guide pages.
   Used by /guides/cs-major/ and /guides/system-design/.
   Uses design tokens from /assets/tdd.css.
   ============================================================ */

.guide {
  padding: 0 clamp(20px, 4vw, 32px);
  max-width: 1120px;
  margin: 0 auto;
}

.guide-hero {
  padding: clamp(48px, 7vw, 96px) 0 clamp(32px, 4vw, 48px);
}

.guide-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
}

@media (max-width: 820px) {
  .guide-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pdf-mock {
    order: -1;
  }
}

.guide-kicker {
  font-family: var(--tdd-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--tdd-ink-3);
  margin-bottom: 16px;
}

.guide-title {
  font-family: var(--tdd-sans);
  font-weight: 800;
  font-size: clamp(40px, 5.5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--tdd-ink);
  margin: 0 0 20px;
}

.guide-title .hl {
  color: var(--tdd-blue);
  background: none;
  padding: 0;
}

.guide-lede {
  font-size: clamp(17px, 1.3vw, 19px);
  color: var(--tdd-ink-2);
  line-height: 1.55;
  max-width: 56ch;
  margin: 0 0 24px;
}

.guide-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---------- PDF mock visual ---------- */

.pdf-mock {
  position: relative;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 4 / 5;
  margin: 0 auto;
}

.pdf-mock-paper {
  position: absolute;
  inset: 0;
  border: 1px solid var(--tdd-border);
  border-radius: var(--tdd-r-lg);
  background: var(--tdd-surface);
  box-shadow: var(--tdd-shadow-2);
}

.pdf-mock-back-2 {
  transform: rotate(-4deg) translate(-14px, 12px);
  background: #f3f5f7;
  opacity: 0.8;
}

.pdf-mock-back-1 {
  transform: rotate(2deg) translate(8px, 5px);
  background: #fafbfc;
}

.pdf-mock-front {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 28px;
  background: var(--tdd-surface);
  transform: rotate(-1deg);
  box-shadow: var(--tdd-shadow-3);
  transition: transform 0.35s ease;
  overflow: hidden;
}

.pdf-mock:hover .pdf-mock-front {
  transform: rotate(0deg) translate(-2px, -4px);
}

/* colored stripe on top */
.pdf-mock-front::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--tdd-red);
}

.pdf-mock-front--blue::before {
  background: var(--tdd-blue);
}

.pdf-mock-front--green::before {
  background: var(--tdd-green);
}

.pdf-mock-front--orange::before {
  background: var(--tdd-orange);
}

.pdf-mock-front--violet::before {
  background: var(--tdd-violet);
}

/* subtle dot grid inside */
.pdf-mock-front::after {
  content: "";
  position: absolute;
  inset: 20px 0 20px 0;
  background-image: radial-gradient(var(--tdd-dot) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: 0.4;
  pointer-events: none;
}

.pdf-mock-label,
.pdf-mock-title,
.pdf-mock-footer {
  position: relative;
  z-index: 1;
}

.pdf-mock-label {
  font-family: var(--tdd-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--tdd-ink-3);
}

.pdf-mock-title {
  font-family: var(--tdd-sans);
  font-weight: 800;
  font-size: 44px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--tdd-ink);
}

.pdf-mock-footer {
  font-family: var(--tdd-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--tdd-ink-4);
}

/* ---------- Section heading ---------- */

.section-heading {
  font-family: var(--tdd-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--tdd-ink-3);
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.section-heading::before {
  content: "";
  width: 22px;
  height: 1.5px;
  background: var(--tdd-ink-4);
  flex: 0 0 auto;
}

/* ---------- What's inside ---------- */

.guide-inside {
  padding: clamp(32px, 4vw, 56px) 0;
}

.guide-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
  max-width: 720px;
}

.guide-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 16px;
  line-height: 1.55;
  color: var(--tdd-ink);
}

.guide-checklist li::before {
  content: "";
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 999px;
  background: var(--tdd-green-100);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2316a34a' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><path d='M3 12 L9 18 L21 6' /></svg>");
  background-repeat: no-repeat;
  background-position: center;
}

.guide-outro {
  font-family: var(--tdd-sans);
  font-size: clamp(17px, 1.3vw, 19px);
  color: var(--tdd-ink-2);
  max-width: 620px;
  margin: 28px 0 0;
  line-height: 1.5;
}

/* ---------- Gate ---------- */

.guide-gate-wrap {
  padding: clamp(16px, 3vw, 32px) 0 clamp(48px, 6vw, 72px);
}

.guide-gate {
  max-width: 720px;
  margin: 0 auto;
}

.guide-gate .nl--inline {
  padding: clamp(28px, 4vw, 40px);
  background: var(--tdd-surface);
  border: 1px solid var(--tdd-border);
  border-radius: var(--tdd-r-lg);
  box-shadow: var(--tdd-shadow-2);
  position: relative;
}

.guide-gate .nl--inline::after {
  display: none;
}

.guide-gate .nl__eyebrow,
.guide-gate .nl__headline,
.guide-gate .nl__sub {
  display: block;
}

.guide-gate .nl__headline {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 10px;
}

.guide-gate .nl__sub {
  font-size: 15px;
  color: var(--tdd-ink-3);
  margin-bottom: 20px;
}

/* ---------- Unlocked / success ---------- */

.guide-unlocked {
  padding: clamp(32px, 5vw, 56px) 0 clamp(48px, 6vw, 72px);
}

.guide-unlocked[hidden] {
  display: none;
}

.guide-unlocked-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(32px, 4vw, 48px);
  background: var(--tdd-surface);
  border: 1px solid var(--tdd-green-100);
  border-radius: var(--tdd-r-lg);
  box-shadow: var(--tdd-shadow-2);
  text-align: center;
}

.guide-unlocked-mark {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  background: var(--tdd-green-100);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--tdd-green);
}

.guide-unlocked-mark svg {
  width: 30px;
  height: 30px;
}

.guide-unlocked-title {
  font-family: var(--tdd-sans);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 10px;
  color: var(--tdd-ink);
}

.guide-unlocked-sub {
  color: var(--tdd-ink-3);
  font-size: 15px;
  margin: 0 0 22px;
  line-height: 1.55;
}

/* Download button (uses .tdd-btn classes directly in markup) */