/* ══════════════════════════════════════════════════════════════
   LANDING SCREEN — premium marketing page
   Sections below live in index.html's #landing-screen and are all
   prefixed `lp-` (page chrome) to stay clear of `landing-` (structural
   ids/classes wired up by src/app/landing.js — do not rename those
   without updating that file). See docs/architecture.md and this file's
   header comment in index.html for the section map.
══════════════════════════════════════════════════════════════ */
#landing-screen {
  position: fixed; inset: 0; z-index: 900;
  background: var(--bg-base);
  overflow-y: auto; overscroll-behavior-y: contain;
  scroll-behavior: smooth;
}
#landing-screen.hidden { display: none; }
@media (prefers-reduced-motion: reduce) {
  #landing-screen { scroll-behavior: auto; }
}
.landing-glow-bg {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 55% 32% at 18% 0%,  var(--landing-glow) 0%, transparent 65%),
    radial-gradient(ellipse 50% 34% at 100% 18%, var(--landing-glow) 0%, transparent 60%);
}
.lp-scroll { position: relative; }

/* ── Brand intro (Typora-inspired opener) ──────────────────────────
   Full-viewport section shown before the nav/hero — a brand moment, not
   product UI, so it stays a plain wordmark + typed tagline + scroll cue.
   100svh (not 100vh) so mobile browser chrome collapsing/expanding never
   leaves a sliver of the nav peeking in under it. */
.lp-intro {
  position: relative;
  min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.lp-intro-inner {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  /* fill-mode "both" is what makes the reduced-motion override below work
     with a single `animation: none` — without an explicit opacity/transform
     override, the element just falls back to its un-animated (fully
     visible) base state. */
  animation: lp-intro-in 550ms ease both;
}
@keyframes lp-intro-in {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: none; }
}
.lp-intro-wordmark {
  font-size: clamp(2.4rem, 9vw, 5rem);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1;
  color: var(--text-primary);
}
.lp-intro-wordmark span { color: var(--accent); }
/* Fixed ch-width (a hair over the longest of the cycling taglines' 44 chars
   — see INTRO_TAGLINES in src/app/landing.js) reserved up front so the
   typed text grows left-to-right from a stable edge instead of re-centering
   itself with every keystroke, while the block as a whole still sits
   centered under the wordmark like everything else in .lp-intro-inner. */
.lp-intro-tagline {
  display: flex; align-items: center; justify-content: flex-start;
  margin-top: clamp(14px, 3vw, 22px);
  width: 45ch; max-width: 100%; overflow: hidden; white-space: nowrap;
  font-family: var(--font-mono);
  font-size: clamp(0.82rem, 2vw, 1rem);
  color: var(--text-secondary);
}
.lp-intro-caret {
  display: inline-block; flex-shrink: 0;
  width: 0.5em; height: 1em; margin-left: 2px;
  background: var(--accent);
  animation: lp-caret-blink 1s step-end infinite;
}
@keyframes lp-caret-blink { 50% { opacity: 0; } }
.lp-intro-scroll-cue {
  position: absolute; left: 50%; bottom: clamp(20px, 5vh, 40px);
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-size: 11.5px; font-weight: 500; letter-spacing: 0.03em;
  color: var(--text-muted); transition: color var(--transition);
}
.lp-intro-scroll-cue:hover { color: var(--text-secondary); text-decoration: none; }
.lp-intro-scroll-cue svg { animation: lp-scroll-cue-bob 1.8s ease-in-out infinite; }
@keyframes lp-scroll-cue-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }
@media (prefers-reduced-motion: reduce) {
  .lp-intro-inner { animation: none; }
  .lp-intro-caret { animation: none; opacity: 0; }
  .lp-intro-scroll-cue svg { animation: none; }
}
@media (max-width: 480px) {
  /* The fixed 40ch reservation (plus nowrap + overflow:hidden) can exceed
     a narrow phone's available width even at the tagline's minimum
     font-size, clipping the tail of the string. Drop the fixed width and
     allow wrapping instead — a two-line tagline beats a silently
     truncated one. */
  .lp-intro-tagline {
    width: auto; max-width: 100%; white-space: normal; overflow: visible;
    text-align: left;
  }
}

.lp-eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.04em;
  color: var(--accent); background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  padding: 5px 12px; border-radius: 20px;
}
.lp-grad {
  background: linear-gradient(100deg, var(--accent) 10%, var(--text-primary) 110%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lp-btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 22px; border-radius: var(--radius-lg);
  background: transparent; border: 1px solid var(--border);
  color: var(--text-primary); font-size: 15px; font-weight: 600;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.lp-btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.lp-btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 24px; border-radius: var(--radius-lg);
  background: var(--accent); color: var(--text-inverse);
  font-size: 15px; font-weight: 600;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: opacity var(--transition), transform var(--transition);
}
.lp-btn-primary:hover  { opacity: 0.92; transform: translateY(-1px); }
.lp-btn-primary:active { transform: scale(0.98); }
.lp-btn-primary svg { width: 18px; height: 18px; }

/* ── Sticky nav ─────────────────────────────────────────────── */
.lp-nav {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg-base) 78%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.lp-nav-inner {
  max-width: 1220px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.lp-nav-logo {
  font-size: 20px; font-weight: 700; letter-spacing: -0.6px; color: var(--text-primary);
  flex-shrink: 0;
}
.lp-nav-logo span { color: var(--accent); }
.lp-nav-links { display: flex; align-items: center; gap: 28px; }
.lp-nav-links a {
  position: relative;
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  transition: color var(--transition);
}
.lp-nav-links a:hover { color: var(--text-primary); text-decoration: none; }
/* Active-section indicator (src/app/landing.js's IntersectionObserver-driven
   scroll spy) — an underline rather than a background pill, so it reads as
   "you are here" without competing with .lp-nav-cta for visual weight. */
.lp-nav-links a::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: -5px;
  height: 2px; border-radius: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.25s ease;
}
.lp-nav-links a.active { color: var(--text-primary); }
.lp-nav-links a.active::after { transform: scaleX(1); }
.lp-nav-actions { display: flex; align-items: center; gap: 10px; }
.lp-nav-cta {
  padding: 9px 18px; border-radius: var(--radius-md);
  background: var(--accent); color: var(--text-inverse);
  font-size: 14px; font-weight: 600; white-space: nowrap;
  transition: opacity var(--transition), transform var(--transition);
}
.lp-nav-cta:hover { opacity: 0.9; }
.lp-nav-cta:active { transform: scale(0.97); }
.lp-nav-toggle {
  display: none; width: 36px; height: 36px; border-radius: var(--radius-sm);
  align-items: center; justify-content: center; color: var(--text-primary);
}
@media (max-width: 860px) {
  .lp-nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 2px;
    background: var(--bg-surface); border-bottom: 1px solid var(--border);
    padding: 10px 24px 16px;
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height 0.25s ease, opacity 0.2s ease;
  }
  .lp-nav-links.open { max-height: 320px; opacity: 1; padding: 14px 24px 20px; }
  .lp-nav-links a { padding: 9px 0; width: 100%; }
  .lp-nav-cta { display: none; }
  .lp-nav-toggle { display: flex; }
}

/* ── Scroll-reveal (progressive enhancement — content is visible by
   default so it degrades gracefully with JS disabled or motion-reduced) */
.lp-reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.5s ease, transform 0.5s ease; }
.lp-reveal.lp-in-view { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .lp-reveal { opacity: 1; transform: none; transition: none; }
}

/* ── Hero ───────────────────────────────────────────────────── */
.lp-hero {
  max-width: 1220px; margin: 0 auto;
  padding: clamp(48px, 8vw, 96px) 24px clamp(56px, 8vw, 88px);
  display: grid; grid-template-columns: minmax(0,1.05fr) minmax(0,0.95fr);
  gap: clamp(32px, 5vw, 64px); align-items: center;
}
.lp-hero-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.lp-h1 {
  font-size: clamp(2.15rem, 4.4vw, 3.4rem); line-height: 1.08; font-weight: 700;
  letter-spacing: -0.02em; color: var(--text-primary); max-width: 15ch;
}
.lp-sub { font-size: clamp(1rem, 1.3vw, 1.14rem); line-height: 1.6; color: var(--text-secondary); max-width: 46ch; }
.lp-hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 4px; }
.lp-hero-join-link {
  font-size: 13.5px; color: var(--text-secondary); font-weight: 500;
  transition: color var(--transition);
}
.lp-hero-join-link:hover { color: var(--accent); text-decoration: none; }
.lp-hero .landing-chips { justify-content: flex-start; margin-top: 10px; }

.lp-hero-visual { position: relative; }
/* The coded demo itself (.lp-demo*) lives in styles/landing-demo.css,
   loaded right after this file — see index.html's <head>. Headline/CTA
   copy stays first in both DOM and visual order at this width (no `order`
   swap on .lp-hero-visual) — on tablet/mobile the headline and CTA must
   appear before the demo, not after it. */
@media (max-width: 980px) {
  .lp-hero { grid-template-columns: 1fr; }
  .lp-hero-visual { max-width: 560px; margin: 0 auto; }
  .lp-hero-copy { align-items: center; text-align: center; }
  .lp-h1, .lp-sub { max-width: 100%; }
  .lp-hero-ctas, .lp-hero .landing-chips { justify-content: center; }
}

/* ── Section scaffolding ───────────────────────────────────────── */
.lp-section-head { max-width: 640px; margin: 0 auto 40px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.lp-section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; letter-spacing: -0.015em; color: var(--text-primary); }
.lp-section-head p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; }
.lp-features, .lp-how, .lp-trust { max-width: 1220px; margin: 0 auto; padding: clamp(48px, 7vw, 88px) 24px; }
.lp-how { border-top: 1px solid var(--border-soft); }
.lp-trust { border-top: 1px solid var(--border-soft); }

/* ── Feature storytelling ──────────────────────────────────────── */
.lp-feature-shell { display: grid; grid-template-columns: 268px minmax(0,1fr); gap: 28px; align-items: start; }
.lp-feature-tabs { display: flex; flex-direction: column; gap: 4px; position: sticky; top: 84px; }
.lp-feature-tab {
  display: flex; align-items: center; gap: 12px; text-align: left;
  padding: 12px 14px; border-radius: var(--radius-md);
  color: var(--text-secondary); font-size: 14px; font-weight: 500;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.lp-feature-tab svg { width: 17px; height: 17px; flex-shrink: 0; }
.lp-feature-tab:hover { background: var(--bg-elevated); color: var(--text-primary); }
.lp-feature-tab.active {
  background: var(--accent-dim); border-color: var(--accent-glow); color: var(--accent);
}
.lp-feature-panels { position: relative; min-height: 360px; }
.lp-feature-panel {
  display: none; grid-template-columns: minmax(0,0.85fr) minmax(0,1.15fr); gap: 36px; align-items: center;
}
.lp-feature-panel.active { display: grid; animation: lp-fade 0.35s ease; }
@keyframes lp-fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.lp-feature-panel-copy h3 { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 12px; color: var(--text-primary); }
.lp-feature-panel-copy p { font-size: 15px; line-height: 1.65; color: var(--text-secondary); }
.lp-feature-panel img {
  width: 100%; height: auto; display: block; border-radius: var(--radius-lg);
  border: 1px solid var(--border); box-shadow: var(--shadow-md);
}
.lp-mini-mock {
  background: var(--bg-surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 18px; display: flex; flex-direction: column; gap: 10px; box-shadow: var(--shadow-md);
}
.lp-mini-mock-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; background: var(--bg-elevated); border-radius: var(--radius-md);
  font-size: 13.5px; color: var(--text-primary);
}
.lp-mini-pill {
  font-size: 11.5px; font-weight: 600; padding: 3px 10px; border-radius: 20px;
  color: var(--text-muted); background: var(--bg-input); border: 1px solid var(--border);
}
.lp-mini-pill.on { color: var(--accent); background: var(--accent-dim); border-color: var(--accent-glow); }
@media (max-width: 900px) {
  .lp-feature-shell { grid-template-columns: 1fr; }
  .lp-feature-tabs { position: static; flex-direction: row; overflow-x: auto; gap: 8px; padding-bottom: 4px; }
  .lp-feature-tab { flex-shrink: 0; }
  .lp-feature-tab span { white-space: nowrap; }
  .lp-feature-panel, .lp-feature-panel.active { grid-template-columns: 1fr; }
  .lp-feature-panel img { order: -1; }
}

/* ── How it works ──────────────────────────────────────────────── */
.lp-steps { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 20px; }
.lp-step {
  position: relative; padding: 26px 22px; border-radius: var(--radius-lg);
  background: var(--bg-surface); border: 1px solid var(--border); overflow: hidden;
}
.lp-step-num {
  display: block; font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  color: var(--accent); background: var(--accent-dim); border: 1px solid var(--accent-glow);
  width: 30px; height: 30px; border-radius: 9px; line-height: 28px; text-align: center;
  margin-bottom: 14px;
}
.lp-step h3 { font-size: 15.5px; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
.lp-step p { font-size: 13.5px; line-height: 1.55; color: var(--text-secondary); }
@media (max-width: 900px) { .lp-steps { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 520px) { .lp-steps { grid-template-columns: 1fr; } }

/* ── Trust / benefits ──────────────────────────────────────────── */
.lp-benefit-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.lp-benefit-card {
  padding: 24px 22px; border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--bg-surface) 92%, transparent);
  border: 1px solid var(--border);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.lp-benefit-card:hover { transform: translateY(-3px); border-color: var(--accent-glow); box-shadow: var(--shadow-md); }
.lp-benefit-card svg {
  width: 20px; height: 20px; color: var(--accent);
  background: var(--accent-dim); border: 1px solid var(--accent-glow);
  padding: 10px; border-radius: 12px; box-sizing: content-box; margin-bottom: 14px;
}
.lp-benefit-card h3 { font-size: 15.5px; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
.lp-benefit-card p { font-size: 13.5px; line-height: 1.55; color: var(--text-secondary); }
@media (max-width: 900px) { .lp-benefit-grid { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 560px) { .lp-benefit-grid { grid-template-columns: 1fr; } }

/* ── Final CTA band ──────────────────────────────────────────────── */
.lp-cta {
  margin: 0 24px clamp(48px, 7vw, 88px); padding: clamp(48px, 7vw, 76px) 24px;
  max-width: 1172px; margin-left: auto; margin-right: auto;
  border-radius: var(--radius-xl); text-align: center;
  background: linear-gradient(135deg, var(--accent-dim), transparent 65%), var(--bg-surface);
  border: 1px solid var(--border);
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.lp-cta h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 700; letter-spacing: -0.015em; color: var(--text-primary); }
.lp-cta p { font-size: 15px; color: var(--text-secondary); max-width: 42ch; }
.lp-cta-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 8px; }
.lp-cta .landing-create-btn { margin-bottom: 0; }

/* ── Footer ───────────────────────────────────────────────────────── */
.lp-footer { border-top: 1px solid var(--border-soft); padding: 48px 24px 28px; }
.lp-footer-top {
  max-width: 1220px; margin: 0 auto; padding-bottom: 32px;
  display: grid; grid-template-columns: 1.4fr repeat(3, minmax(0,1fr)); gap: 32px;
}
.lp-footer-brand p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.6; max-width: 30ch; margin-top: 8px; }
.lp-footer-brand .landing-logo.lp-footer-logo { font-size: 20px; margin-bottom: 0; }
.lp-footer-col { display: flex; flex-direction: column; gap: 10px; }
.lp-footer-col h4 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); margin-bottom: 2px; }
.lp-footer-col a { font-size: 13.5px; color: var(--text-secondary); transition: color var(--transition); }
.lp-footer-col a:hover { color: var(--accent); text-decoration: none; }
.lp-footer-bottom {
  max-width: 1220px; margin: 0 auto; padding-top: 22px; border-top: 1px solid var(--border-soft);
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between;
  font-size: 12.5px; color: var(--text-muted);
}
.lp-footer-bottom a { color: var(--text-muted); text-decoration: underline; }
.lp-footer-bottom a:hover { color: var(--accent); }
@media (max-width: 800px) {
  .lp-footer-top { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 520px) {
  .lp-footer-top { grid-template-columns: 1fr; }
}

/* ── Shared landing widgets (create/join, recent rooms, chips) ────────────
   Used on the bare /app screen below. `.landing-create-btn` is a full-width
   block button there (single button in a narrow card); the marketing page's
   own CTA buttons use `.lp-btn-primary`/`.lp-btn-secondary` instead — see
   the sticky-nav section above. */
.landing-create-btn {
  width: 100%; padding: 15px 24px;
  background: var(--accent); color: var(--text-inverse);
  border-radius: var(--radius-lg);
  font-size: 15px; font-weight: 600;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 4px 20px var(--accent-glow);
  margin-bottom: 18px;
}
.landing-create-btn:hover  { opacity: 0.92; transform: translateY(-1px); }
.landing-create-btn:active { transform: scale(0.98); }
.landing-create-btn svg    { width: 18px; height: 18px; }
.landing-or {
  font-size: 12px; color: var(--text-muted);
  text-align: center; margin-bottom: 12px;
  display: flex; align-items: center; gap: 10px; width: 100%;
}
.landing-or::before, .landing-or::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.landing-join { display: flex; gap: 8px; width: 100%; margin-bottom: 32px; }
.landing-join-input {
  flex: 1; padding: 11px 14px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-md); color: var(--text-primary);
  font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.landing-join-input:focus { border-color: var(--accent); }
.landing-join-input::placeholder { color: var(--text-muted); }
.landing-join-btn {
  padding: 11px 18px; border-radius: var(--radius-md);
  background: var(--bg-elevated); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; font-weight: 500; white-space: nowrap;
  transition: background var(--transition), border-color var(--transition);
}
.landing-join-btn:hover { background: var(--bg-surface); border-color: var(--accent); color: var(--accent); }
/* Recent rooms — a local (this-device-only) shortcut list, safe to persist
   plainly now that room_id alone grants access (see supabase/migrations/
   0009_revert_edit_token_write_gating.sql). Hidden entirely when empty. */
.landing-recent { width: 100%; margin-bottom: 24px; }
.landing-recent.hidden { display: none; }
.landing-recent-title {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted); margin-bottom: 8px;
}
.landing-recent-list { display: flex; flex-direction: column; gap: 4px; }
.landing-recent-item {
  display: flex; align-items: stretch; gap: 4px;
}
.landing-recent-item-btn {
  flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 8px;
  padding: 8px 10px; border-radius: var(--radius-md);
  background: var(--bg-elevated); border: 1px solid var(--border);
  text-align: left;
  transition: border-color var(--transition), background var(--transition);
}
.landing-recent-item-btn:hover { border-color: var(--accent); background: var(--bg-surface); }
.landing-recent-name {
  flex: 1; min-width: 0; font-size: 13px; color: var(--text-primary);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.landing-recent-time { font-size: 11px; color: var(--text-muted); white-space: nowrap; flex-shrink: 0; }
.landing-recent-remove {
  width: 34px; flex-shrink: 0; border-radius: var(--radius-md);
  background: var(--bg-elevated); border: 1px solid var(--border);
  color: var(--text-muted); font-size: 15px; line-height: 1;
  transition: border-color var(--transition), color var(--transition);
}
.landing-recent-remove:hover { border-color: var(--red); color: var(--red); }

.landing-chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.landing-chip {
  font-size: 12px; color: var(--text-secondary);
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: 20px; padding: 4px 12px;
}

/* ══════════════════════════════════════════════════════════════
   APP LANDING SCREEN (/app) — the original bare create/join screen.
   Reuses the shared widgets above (.landing-create-btn, .landing-join,
   .landing-recent*, .landing-chips) inside its own narrow centered card,
   same layout the marketing page's #landing-screen used before its redesign.
══════════════════════════════════════════════════════════════ */
#app-landing-screen {
  position: fixed; inset: 0; z-index: 900;
  background: var(--bg-base);
  display: flex; align-items: center; justify-content: center;
  padding: 24px; overflow-y: auto;
}
#app-landing-screen.hidden { display: none; }
.app-landing-inner {
  position: relative;
  width: 100%; max-width: 420px;
  display: flex; flex-direction: column;
  align-items: center; gap: 0;
  animation: app-landing-in 0.4s ease;
}
@keyframes app-landing-in {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.app-landing-back {
  align-self: flex-start;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500; color: var(--text-muted);
  margin-bottom: 28px;
  transition: color var(--transition);
}
.app-landing-back:hover { color: var(--accent); text-decoration: none; }
.landing-logo {
  font-size: 42px; font-weight: 600;
  color: var(--text-primary); letter-spacing: -1.5px;
  margin-bottom: 12px;
}
.landing-logo span { color: var(--accent); }
.landing-tagline {
  font-size: 15px; color: var(--text-secondary);
  text-align: center; line-height: 1.6;
  max-width: 300px; margin-bottom: 40px;
}

/* ── Auth Cards ────────────────────────────────────────────── */
.auth-screen {
  position: fixed; inset: 0; z-index: 900;
  background: var(--bg-base);
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.auth-screen.hidden { display: none; }
.auth-card {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 36px 32px;
  width: 100%; max-width: 380px; box-shadow: var(--shadow-lg);
}
.auth-card-icon { font-size: 36px; text-align: center; margin-bottom: 16px; }
.auth-card h2 { font-size: 20px; font-weight: 600; text-align: center; margin-bottom: 6px; }
.auth-card p  { font-size: 14px; color: var(--text-secondary); text-align: center; margin-bottom: 24px; line-height: 1.5; }
.auth-card--centered  { text-align: center; }
.loading-spinner--spaced { margin: 0 auto 12px; }
.auth-loading-text    { color: var(--text-secondary); font-size: 14px; margin: 0; }
.auth-card .room-badge {
  background: var(--accent-dim); color: var(--accent);
  font-size: 12px; font-family: var(--font-mono);
  padding: 3px 10px; border-radius: 20px;
  margin: 0 auto 20px; display: block; text-align: center;
}
.auth-input {
  width: 100%; padding: 12px 16px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-md); color: var(--text-primary);
  font-size: 15px; outline: none; transition: border-color var(--transition);
}
.auth-input:focus { border-color: var(--accent); }
.auth-input.error { border-color: var(--red); }
.auth-error { font-size: 12px; color: var(--red); margin-top: 6px; min-height: 16px; }
.auth-btn {
  width: 100%; margin-top: 14px; padding: 12px; border-radius: var(--radius-md);
  background: var(--accent); color: var(--text-inverse);
  font-size: 15px; font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
}
.auth-btn:hover  { opacity: 0.9; }
.auth-btn:active { transform: scale(0.98); }
.auth-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.reveal-countdown {
  text-align: center; font-family: var(--font-mono); font-size: 22px;
  font-weight: 600; color: var(--accent); margin-top: 4px;
}