/* ==========================================================================
   C++ Mastery · Landing page
   ========================================================================== */

/* ------------------------------------------------------------------- HERO */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--nav-h) + 4vh) 0 5vh;
  overflow: hidden;
  background: #000;
  color: var(--on-void);
  isolation: isolate;
}
.aurora { position: absolute; inset: -30% -10%; z-index: -2; filter: blur(70px); opacity: 0.85; }
.aurora span {
  position: absolute; border-radius: 50%; mix-blend-mode: screen;
  animation: drift 26s var(--ease-io) infinite alternate;
}
.aurora .a1 { width: 46vw; height: 46vw; left: -6vw; top: 4vh; background: radial-gradient(circle at 30% 30%, rgba(41,151,255,.85), transparent 62%); }
.aurora .a2 { width: 42vw; height: 42vw; right: -4vw; top: -6vh; background: radial-gradient(circle at 60% 40%, rgba(191,90,242,.7), transparent 64%); animation-duration: 32s; animation-delay: -6s; }
.aurora .a3 { width: 52vw; height: 40vw; left: 22vw; bottom: -18vh; background: radial-gradient(circle at 50% 50%, rgba(94,92,230,.6), transparent 66%); animation-duration: 38s; animation-delay: -12s; }
.aurora .a4 { width: 30vw; height: 30vw; right: 16vw; bottom: -6vh; background: radial-gradient(circle at 50% 50%, rgba(90,200,250,.55), transparent 66%); animation-duration: 30s; animation-delay: -18s; }
@keyframes drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(4vw, -5vh, 0) scale(1.16); }
}
.hero-grid {
  position: absolute; inset: 0; z-index: -1; opacity: 0.28;
  background-image: linear-gradient(rgba(255,255,255,.09) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.09) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 40%, #000 20%, transparent 78%);
}
.hero-noise {
  position: absolute; inset: 0; z-index: -1; opacity: 0.5; pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
  mix-blend-mode: overlay; color: #fff;
}
.hero-inner { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center; }
@media (max-width: 940px) { .hero-inner { grid-template-columns: minmax(0, 1fr); text-align: center; } }

.hero-kicker {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.4rem 0.9rem 0.4rem 0.5rem; border-radius: var(--r-pill);
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  font-size: 0.78rem; letter-spacing: 0.02em; color: #e5e5ea;
  backdrop-filter: blur(12px);
}
.hero-kicker b { font-weight: 600; color: #fff; }
.pulse-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(48,209,88,.7); animation: pulse 2.4s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 9px rgba(48,209,88,0); } 100% { box-shadow: 0 0 0 0 rgba(48,209,88,0); } }

.hero h1 {
  font-size: var(--f-display); font-weight: 700; letter-spacing: -0.035em; line-height: 0.94;
  margin: 1.1rem 0 0;
}
.hero h1 .line { display: block; }
.hero h1 .shine {
  background: linear-gradient(100deg, #5ac8fa 0%, #2997ff 26%, #bf5af2 58%, #ff9f0a 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  background-size: 220% 100%;
  animation: shine 9s var(--ease-io) infinite alternate;
}
@keyframes shine { from { background-position: 0% 50%; } to { background-position: 100% 50%; } }
.hero-sub { margin-top: 1.4rem; font-size: var(--f-lead); color: #c7c7cc; max-width: 34em; line-height: 1.45; }
@media (max-width: 940px) { .hero-sub { margin-left: auto; margin-right: auto; } }
.hero-cta { display: flex; gap: 0.8rem; margin-top: 2rem; flex-wrap: wrap; }
@media (max-width: 940px) { .hero-cta { justify-content: center; } }
.hero-stats { display: flex; gap: clamp(1.2rem, 3vw, 2.6rem); margin-top: 3rem; flex-wrap: wrap; }
@media (max-width: 940px) { .hero-stats { justify-content: center; } }
.hero-stats div { min-width: 84px; }
.hero-stats b { display: block; font-size: clamp(1.5rem, 2.6vw, 2.1rem); font-weight: 600; letter-spacing: -0.03em; }
.hero-stats span { font-size: var(--f-xs); color: #86868b; }

/* Code window (floating, typing) */
.codewin {
  position: relative;
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(28,28,30,.92), rgba(14,14,16,.96));
  border: 1px solid rgba(255,255,255,.13);
  box-shadow: 0 40px 120px -30px rgba(41,151,255,.5), 0 8px 40px rgba(0,0,0,.6);
  overflow: hidden;
  transform: perspective(1400px) rotateY(-9deg) rotateX(4deg) translateZ(0);
  animation: floaty 9s var(--ease-io) infinite alternate;
}
@keyframes floaty {
  from { transform: perspective(1400px) rotateY(-9deg) rotateX(4deg) translateY(-6px); }
  to   { transform: perspective(1400px) rotateY(-6deg) rotateX(2deg) translateY(10px); }
}
@media (max-width: 940px) { .codewin { transform: none; animation: none; margin-top: 2.5rem; } }
.codewin-bar { display: flex; align-items: center; gap: 0.5rem; padding: 0.7rem 0.95rem; border-bottom: 1px solid rgba(255,255,255,.09); }
.codewin-bar i { width: 11px; height: 11px; border-radius: 50%; background: #3a3a3c; }
.codewin-bar i:nth-child(1) { background: #ff5f57; } .codewin-bar i:nth-child(2) { background: #febc2e; } .codewin-bar i:nth-child(3) { background: #28c840; }
.codewin-bar span { margin-left: 0.6rem; font-family: var(--font-mono); font-size: 0.72rem; color: #8e8e93; }
.codewin-body { padding: 1rem 1.1rem 1.2rem; font-family: var(--font-mono); font-size: clamp(0.7rem, 1.05vw, 0.86rem); line-height: 1.65; min-height: 15.5rem; }
.codewin-body .ln { color: #48484a; user-select: none; display: inline-block; width: 1.7em; text-align: right; margin-right: 1em; }
.codewin-body .row { white-space: pre; }
.typing::after { content: "▍"; color: var(--blue-bright); animation: caret 1s steps(2) infinite; }
@keyframes caret { 50% { opacity: 0; } }
.queue { margin-top: 0.55rem; padding-top: 0.55rem; border-top: 1px dashed rgba(255,255,255,.1); font-size: 0.8em; color: #8e8e93; }
.queue b { color: var(--green); font-weight: 500; }
.float-badge {
  position: absolute; padding: 0.5rem 0.85rem; border-radius: 14px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.16);
  backdrop-filter: blur(14px); font-size: 0.76rem; color: #fff; font-weight: 500;
  box-shadow: 0 14px 40px rgba(0,0,0,.4);
}
.fb-1 { top: -14px; left: -18px; animation: floaty 7s var(--ease-io) infinite alternate; }
.fb-2 { bottom: 26px; right: -22px; animation: floaty 8.5s var(--ease-io) -2s infinite alternate; }
@media (max-width: 640px) { .fb-1, .fb-2 { display: none; } }
.scroll-hint { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); color: #6e6e73; font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; display: grid; gap: 0.4rem; justify-items: center; }
.scroll-hint i { width: 1px; height: 34px; background: linear-gradient(#6e6e73, transparent); animation: drop 2.2s var(--ease-io) infinite; }
@keyframes drop { 0% { transform: scaleY(0); transform-origin: top; } 60% { transform: scaleY(1); transform-origin: top; } 100% { opacity: 0; } }

/* marquee ticker */
.ticker { background: var(--paper-2); border-bottom: 1px solid var(--line); overflow: hidden; padding: 0.85rem 0; }
.ticker-track { display: flex; gap: 3rem; width: max-content; animation: slide 42s linear infinite; }
.ticker-track span { font-size: var(--f-xs); color: var(--ink-3); white-space: nowrap; display: inline-flex; align-items: center; gap: 0.5rem; }
.ticker-track span::before { content: "◆"; color: var(--blue); font-size: 0.55rem; }
@keyframes slide { to { transform: translateX(-50%); } }

/* ------------------------------------------------------------ feature rows */
.feat { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(1.6rem, 4.5vw, 4rem); align-items: center; }
.feat.rev > .feat-copy { order: 2; }
@media (max-width: 860px) {
  .feat { grid-template-columns: minmax(0, 1fr); }
  .feat.rev > .feat-copy { order: 0; }
}
.feat h2 { font-size: var(--f-h2); letter-spacing: -0.03em; }
.feat p { font-size: var(--f-lead); color: var(--ink-2); margin-top: 1rem; line-height: 1.5; }

/* sticky scroll showcase */
.showcase { background: var(--void); color: var(--on-void); }
.showcase .pin { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.15fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: start; }
@media (max-width: 900px) { .showcase .pin { grid-template-columns: minmax(0, 1fr); } }
.showcase .pin-copy { position: sticky; top: calc(var(--nav-h) + 12vh); }
.scene-list { display: grid; gap: 1.1rem; }
.scene {
  border: 1px solid var(--void-line); border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.015));
  padding: clamp(1.2rem, 2.4vw, 1.8rem);
  opacity: 0.42; transform: scale(0.985); transition: opacity .6s var(--ease-out), transform .7s var(--ease-out), border-color .6s;
}
.scene.on { opacity: 1; transform: none; border-color: rgba(41,151,255,.45); box-shadow: 0 24px 70px -30px rgba(41,151,255,.6); }
.scene h3 { font-size: var(--f-h3); letter-spacing: -0.02em; }
.scene p { color: var(--on-void-2); margin-top: 0.6rem; font-size: var(--f-sm); line-height: 1.55; }
.scene-visual {
  margin-top: 1.1rem; border-radius: var(--r-md); background: #0d0d0f; border: 1px solid var(--void-line);
  padding: 0.9rem 1rem; font-family: var(--font-mono); font-size: 0.78rem; line-height: 1.7; overflow: hidden;
}
.scene-visual .ok { color: var(--green); } .scene-visual .bad { color: var(--red); } .scene-visual .dim { color: #6e6e73; } .scene-visual .hi { color: var(--blue-bright); }
.scene-progress { display: flex; gap: 0.3rem; margin-top: 0.9rem; }
.scene-progress i { height: 4px; flex: 1; border-radius: 99px; background: rgba(255,255,255,.1); }
.scene-progress i.on { background: var(--grad-signature); }

/* ------------------------------------------------------------- chapter map */
.stage-title { display: flex; align-items: center; gap: 0.9rem; margin-bottom: 1.4rem; }
.stage-title .num {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.1em;
  color: var(--blue); background: rgba(0,113,227,.1); padding: 0.3rem 0.7rem; border-radius: var(--r-pill);
}
.stage-title h3 { font-size: var(--f-h3); }
.stage-title .rule { flex: 1; height: 1px; background: var(--line); }

.chapter-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
@media (max-width: 980px) { .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 620px) { .chapter-grid { grid-template-columns: minmax(0, 1fr); } }
.chapter-card {
  position: relative; display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--line); border-radius: var(--r-md); padding: 1.15rem 1.2rem 1.3rem;
  background: var(--paper); overflow: hidden;
  transition: transform .5s var(--ease-out), box-shadow .5s var(--ease-out), border-color .4s;
}
.chapter-card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; opacity: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(41,151,255,.16), transparent 62%);
  transition: opacity .5s;
}
.chapter-card:hover { transform: translateY(-5px); box-shadow: var(--sh-2); border-color: rgba(41,151,255,.4); text-decoration: none; }
.chapter-card:hover::after { opacity: 1; }
.chapter-card .idx { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); }
.chapter-card h4 { margin-top: 0.5rem; font-size: 1.06rem; letter-spacing: -0.02em; }
.chapter-card p { margin-top: 0.45rem; font-size: var(--f-xs); color: var(--ink-2); line-height: 1.55; }
.chapter-card .meta { display: flex; gap: 0.4rem; margin-top: 0.9rem; flex-wrap: wrap; }

/* ------------------------------------------------------------------- stats */
.stat-big { text-align: center; }
.stat-big b { display: block; font-size: clamp(2.4rem, 6vw, 4.4rem); font-weight: 600; letter-spacing: -0.045em; line-height: 1; }
.stat-big span { font-size: var(--f-sm); color: var(--ink-2); display: block; margin-top: 0.5rem; }

/* ------------------------------------------------------------- resource row */
.res-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
@media (max-width: 900px) { .res-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .res-grid { grid-template-columns: minmax(0, 1fr); } }
.res {
  display: flex; flex-direction: column; gap: 0.5rem; text-decoration: none; color: inherit;
  border: 1px solid var(--void-line); border-radius: var(--r-md); padding: 1.2rem;
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.015));
  transition: transform .45s var(--ease-out), border-color .4s, background .4s;
}
.res:hover { transform: translateY(-4px); border-color: rgba(41,151,255,.5); text-decoration: none; }
.res b { font-size: 0.98rem; color: #fff; }
.res span { font-size: var(--f-xs); color: var(--on-void-2); line-height: 1.55; }
.res .url { font-family: var(--font-mono); font-size: 0.7rem; color: var(--blue-bright); opacity: .9; word-break: break-all; }

/* path timeline on landing */
.path { display: grid; gap: 0; }
.path-row { display: grid; grid-template-columns: 76px minmax(0,1fr); gap: 1.2rem; padding: 1.1rem 0; border-top: 1px solid var(--line); align-items: start; }
.path-row:last-child { border-bottom: 1px solid var(--line); }
.path-row .wk { font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-3); padding-top: 0.2rem; }
.path-row h4 { font-size: 1.05rem; }
.path-row p { font-size: var(--f-sm); color: var(--ink-2); margin-top: 0.35rem; }

/* quote */
.quote {
  border-left: 3px solid transparent;
  border-image: var(--grad-signature) 1;
  padding-left: 1.2rem; font-size: var(--f-lead); color: var(--ink-2); letter-spacing: -0.01em;
}