/* Winny Math Prep — course pages + slide-deck viewer. Builds on the site vars
   (styles.css) and learn.css; dark branded theme throughout. */

/* map prep vars onto the site's light palette (styles.css defines --ink/--line/--muted) */
.prep-main { --text: var(--ink, #1d2733); --border: var(--line, #e4e7ea); --card: #ffffff; }
.prep-main .container { max-width: 1080px; }

/* ---------- course cards / landing ---------- */
.prep-hero { text-align: center; padding: 34px 0 10px; }
.prep-hero h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); margin: 0 0 10px; }
.prep-hero .lede { color: var(--muted); max-width: 760px; margin: 0 auto 6px; font-size: 1.02rem; }
.prep-badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 14px 0 4px; }
.prep-badges span { border: 1px solid var(--border, #2a3140); border-radius: 999px; padding: 6px 14px; font-size: .84rem; color: var(--muted); }

.prep-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin: 26px 0; }
.prep-card { border: 1px solid var(--border, #2a3140); border-radius: 16px; padding: 22px; background: var(--card, #fff); display: flex; flex-direction: column; }
.prep-card h2 { margin: 0 0 6px; font-size: 1.18rem; }
.prep-card .tagline { color: var(--muted); font-size: .92rem; margin: 0 0 12px; }
.prep-card ul { margin: 0 0 16px; padding-left: 18px; font-size: .9rem; color: var(--muted); }
.prep-card ul li { margin: 4px 0; }
.prep-card .btn { margin-top: auto; text-align: center; }
.prep-meta { font-size: .8rem; color: var(--muted); margin: 0 0 12px; }

.prep-how { border: 1px solid var(--border, #2a3140); border-radius: 16px; padding: 22px; margin: 8px 0 30px; }
.prep-how ol { margin: 8px 0 0; padding-left: 20px; }
.prep-how li { margin: 8px 0; color: var(--muted); }
.prep-how b { color: var(--text, #1d2733); }

/* ---------- course page ---------- */
.lesson-list { display: grid; gap: 12px; margin: 20px 0 30px; }
.lesson-row { border: 1px solid var(--border, #2a3140); border-radius: 14px; padding: 16px 18px; display: grid; grid-template-columns: 46px 1fr auto; gap: 14px; align-items: center; }
.lesson-num { width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, #22a722, #0f8a3c); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1.05rem; color: #fff; }
.lesson-row h3 { margin: 0 0 3px; font-size: 1rem; }
.lesson-row p { margin: 0; font-size: .84rem; color: var(--muted); }
.lesson-links { display: flex; gap: 8px; flex-wrap: wrap; }
.lesson-links a { font-size: .82rem; border: 1px solid var(--border, #2a3140); border-radius: 999px; padding: 7px 13px; text-decoration: none; color: var(--text, #1d2733); white-space: nowrap; }
.lesson-links a:hover { border-color: #22a722; }
@media (max-width: 640px) { .lesson-row { grid-template-columns: 40px 1fr; } .lesson-links { grid-column: 1 / -1; } }

/* ---------- deck viewer ---------- */
.pd-wrap { max-width: 900px; margin: 0 auto; }
.pd-progress { height: 5px; border-radius: 999px; background: var(--line-soft, #eef1f3); overflow: hidden; margin: 10px 0 16px; }
.pd-progress span { display: block; height: 100%; background: linear-gradient(90deg, #22a722, #34c759); transition: width .25s; }

.pd-slide { border: 1px solid var(--border, #2a3140); border-radius: 18px; background: var(--card, #fff); padding: clamp(22px, 4vw, 44px); min-height: 420px; }
.pd-slide h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 0 0 12px; }
.pd-slide h2 { font-size: clamp(1.2rem, 3vw, 1.6rem); margin: 0 0 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.pd-title-slide { text-align: center; padding: 60px 0; }
.pd-sub { color: var(--muted); font-size: 1.05rem; }
.pd-brand { margin-top: 34px; font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; color: #22a722; font-weight: 700; }

.pd-points { font-size: 1.05rem; line-height: 1.7; padding-left: 22px; }
.pd-points li { margin: 10px 0; }
.pd-body p { font-size: 1.02rem; line-height: 1.65; margin: 10px 0; }
.pd-math { margin-top: 18px; display: grid; gap: 8px; }
.pd-math-line { font-family: "Space Mono", monospace; font-size: 1.15rem; background: rgba(34,167,34,.08); border: 1px solid rgba(34,167,34,.25); border-radius: 10px; padding: 10px 16px; overflow-x: auto; -webkit-overflow-scrolling: touch; }

.pd-tag { font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; border-radius: 999px; padding: 4px 10px; font-weight: 700; }
.pd-tag-ex { background: rgba(59,130,246,.15); color: #7fb3ff; border: 1px solid rgba(59,130,246,.35); }
.pd-tag-try { background: rgba(251,191,36,.13); color: #fbbf24; border: 1px solid rgba(251,191,36,.35); }
.pd-prompt { font-size: 1.05rem; line-height: 1.6; }
.pd-figure { margin: 14px 0; border: 1px solid var(--border, #2a3140); border-radius: 12px; padding: 10px; background: var(--bg-soft, #f6f7f7); }
.pd-figure svg { display: block; width: 100%; height: auto; max-width: 420px; margin: 0 auto; }

.pd-steps { padding-left: 0; list-style: none; counter-reset: pdstep; margin: 14px 0; display: grid; gap: 8px; }
.pd-steps li { counter-increment: pdstep; display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: baseline; padding: 8px 10px; border-radius: 10px; background: var(--bg-soft, #f6f7f7); }
.pd-steps li::before { content: counter(pdstep); width: 24px; height: 24px; border-radius: 8px; background: rgba(34,167,34,.15); color: #34c759; font-weight: 700; font-size: .8rem; display: flex; align-items: center; justify-content: center; }
.pd-step-math { font-family: "Space Mono", monospace; font-size: 1.02rem; display: block; overflow-x: auto; }
.pd-step-why { display: block; grid-column: 2; color: var(--muted); font-size: .86rem; margin-top: 3px; }
.pd-answer { margin-top: 14px; font-size: 1.05rem; border-top: 1px dashed var(--border, #2a3140); padding-top: 12px; }
.pd-answer b { color: #34c759; }

.pd-reveal-row { display: flex; gap: 10px; margin: 16px 0; }
.pd-hint { border: 1px solid rgba(251,191,36,.35); background: rgba(251,191,36,.08); border-radius: 10px; padding: 12px 14px; margin: 10px 0; font-size: .95rem; }
.pd-solution { margin-top: 10px; }

.pd-nav { display: flex; align-items: center; justify-content: space-between; margin: 16px 0 30px; }
.pd-count { color: var(--muted); font-size: .86rem; font-family: "Space Mono", monospace; }
.pd-btn { border: 1px solid var(--border, #2a3140); background: transparent; color: var(--text, #1d2733); border-radius: 12px; padding: 12px 20px; min-height: 44px; font-size: .95rem; cursor: pointer; font-family: inherit; touch-action: manipulation; }
.pd-btn:hover:not(:disabled) { border-color: #22a722; }
.pd-btn:disabled { opacity: .4; cursor: default; }
.pd-btn-primary { background: linear-gradient(135deg, #22a722, #0f8a3c); border: none; font-weight: 700; }

.pd-kbd-note { text-align: center; color: var(--muted); font-size: .78rem; margin-bottom: 30px; }
.pd-kbd-note kbd { border: 1px solid var(--border, #2a3140); border-radius: 6px; padding: 1px 7px; font-family: "Space Mono", monospace; font-size: .75rem; }
/* touch devices swipe; keyboards navigate — show whichever hint applies */
.pd-swipe-hint { display: none; }
@media (hover: none) { .pd-kbd-keys { display: none; } .pd-swipe-hint { display: inline; } }

/* ---------- module intro page ---------- */
.module-card { border: 1px solid var(--border, #2a3140); border-radius: 18px; padding: clamp(22px, 4vw, 40px); max-width: 760px; margin: 20px auto 30px; }
.module-card h1 { margin: 0 0 8px; font-size: 1.5rem; }
.module-card .focus { color: var(--muted); margin: 0 0 18px; }
.module-facts { display: flex; gap: 18px; flex-wrap: wrap; margin: 0 0 22px; }
.module-facts span { font-size: .84rem; color: var(--muted); border: 1px solid var(--border, #2a3140); border-radius: 999px; padding: 6px 13px; }