/* ============================================
   UNTIL NOVEMBER — The Q4 Launchpad
   Design System: "Luxury Tech × Autumn"
   ============================================ */

/* --- Custom Properties --- */
:root {
  --clr-base: #0b0f1a;
  --clr-surface: #111827;
  --clr-surface-raised: #1a2235;
  --clr-glass: rgba(255, 255, 255, 0.04);
  --clr-glass-border: rgba(255, 255, 255, 0.08);
  --clr-glass-hover: rgba(255, 255, 255, 0.07);
  --clr-amber: #e8913a;
  --clr-amber-light: #f4a853;
  --clr-ember: #c44d2b;
  --clr-gold: #d4a254;
  --clr-sage: #7c9a6e;
  --clr-text: #e8e0d6;
  --clr-text-muted: #9a9084;
  --clr-text-dim: #5c5549;
  --clr-white: #faf5ef;
  --ff-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --ff-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ff-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
  --fs-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --fs-lg: clamp(1.15rem, 1rem + 0.75vw, 1.4rem);
  --fs-xl: clamp(1.6rem, 1.2rem + 2vw, 2.6rem);
  --fs-2xl: clamp(2.2rem, 1.5rem + 3.5vw, 4rem);
  --fs-hero: clamp(3rem, 2rem + 5vw, 6.5rem);
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 6rem;
  --space-section: clamp(5rem, 4rem + 5vw, 10rem);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 100px;
  --transition-fast: 180ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--clr-surface-raised) var(--clr-base);
}

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }

/* --- Utilities --- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 1rem + 2vw, 3rem);
}

.container--narrow { max-width: 860px; }

/* --- Background Atmosphere --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(232, 145, 58, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(196, 77, 43, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 50% 50%, rgba(124, 154, 110, 0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* --- Glass Card --- */
.glass {
  background: var(--clr-glass);
  border: 1px solid var(--clr-glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.glass:hover {
  background: var(--clr-glass-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--ff-display);
  font-weight: 400;
  line-height: 1.1;
  color: var(--clr-white);
}

.label {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-amber);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}

.nav.scrolled {
  background: rgba(11, 15, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--clr-glass-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  color: var(--clr-white);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav__logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-amber);
  display: inline-block;
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--clr-amber);
  transition: width var(--transition-smooth);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--clr-white);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
  width: 100%;
}

.nav__cta {
  font-size: var(--fs-sm);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-pill);
  background: var(--clr-amber);
  color: var(--clr-base);
  font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav__cta:hover {
  background: var(--clr-amber-light);
  transform: translateY(-1px);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav__toggle span {
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--clr-glass-border);
  background: var(--clr-glass);
  margin-bottom: var(--space-lg);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--clr-amber);
  animation: fade-in-up 0.6s ease-out both;
}

.hero__badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--clr-sage);
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero__title {
  font-size: var(--fs-hero);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
  animation: fade-in-up 0.6s ease-out 0.1s both;
}

.hero__title em {
  font-style: italic;
  color: var(--clr-amber);
  position: relative;
}

.hero__sub {
  font-size: var(--fs-lg);
  color: var(--clr-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  animation: fade-in-up 0.6s ease-out 0.2s both;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  animation: fade-in-up 0.6s ease-out 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn--primary {
  background: var(--clr-amber);
  color: var(--clr-base);
}

.btn--primary:hover {
  background: var(--clr-amber-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 145, 58, 0.25);
}

.btn--ghost {
  border: 1px solid var(--clr-glass-border);
  color: var(--clr-text);
}

.btn--ghost:hover {
  background: var(--clr-glass);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn__arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* --- Countdown Section --- */
.countdown-section {
  padding: var(--space-section) 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-header h2 {
  font-size: var(--fs-2xl);
  letter-spacing: -0.02em;
  margin-top: var(--space-xs);
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.countdown-card {
  padding: var(--space-lg);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.countdown-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(232, 145, 58, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  color: var(--clr-amber);
}

.countdown-card__title {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: 4px;
}

.countdown-card__date {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-text-dim);
  margin-bottom: var(--space-md);
}

.countdown-card__timer {
  display: flex;
  gap: var(--space-sm);
}

.countdown-card__unit {
  text-align: center;
}

.countdown-card__value {
  font-family: var(--ff-mono);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--clr-white);
  line-height: 1;
  min-width: 2ch;
  display: block;
}

.countdown-card__label {
  font-size: var(--fs-xs);
  color: var(--clr-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.countdown-card__progress {
  margin-top: var(--space-md);
  height: 3px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  overflow: hidden;
}

.countdown-card__progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-amber), var(--clr-ember));
  border-radius: 3px;
  transition: width 1s ease-out;
}

/* --- Checklists Section --- */
.checklists-section {
  padding: var(--space-section) 0;
  position: relative;
  z-index: 1;
}

.checklist-tabs {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.checklist-tab {
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.checklist-tab:hover {
  color: var(--clr-text);
  background: var(--clr-glass);
}

.checklist-tab.active {
  color: var(--clr-white);
  background: var(--clr-glass);
  border-color: var(--clr-glass-border);
}

.checklist-panel {
  display: none;
}

.checklist-panel.active {
  display: block;
  animation: fade-in 0.3s ease-out;
}

.checklist {
  max-width: 680px;
  margin: 0 auto;
}

.checklist__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--clr-glass-border);
}

.checklist__progress-text {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-text-dim);
}

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}

.checklist__item:hover {
  background: var(--clr-glass);
}

.checklist__checkbox {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--clr-text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  margin-top: 1px;
}

.checklist__item.checked .checklist__checkbox {
  border-color: var(--clr-sage);
  background: var(--clr-sage);
}

.checklist__check-svg {
  width: 12px;
  height: 12px;
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--transition-spring);
}

.checklist__item.checked .checklist__check-svg {
  opacity: 1;
  transform: scale(1);
}

.checklist__text {
  flex: 1;
}

.checklist__item-title {
  font-weight: 500;
  color: var(--clr-white);
  transition: color var(--transition-fast);
}

.checklist__item.checked .checklist__item-title {
  color: var(--clr-text-dim);
  text-decoration: line-through;
  text-decoration-color: var(--clr-text-dim);
}

.checklist__item-desc {
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
  margin-top: 2px;
}

/* --- Leaf Success Animation --- */
.leaf-burst {
  position: fixed;
  pointer-events: none;
  z-index: 200;
}

.leaf-particle {
  position: absolute;
  font-size: 16px;
  animation: leaf-fall 1.2s ease-out forwards;
}

@keyframes leaf-fall {
  0% { opacity: 1; transform: translate(0, 0) rotate(0deg) scale(1); }
  100% { opacity: 0; transform: translate(var(--tx), var(--ty)) rotate(var(--rot)) scale(0.3); }
}

/* --- Palettes Section --- */
.palettes-section {
  padding: var(--space-section) 0;
  position: relative;
  z-index: 1;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}

.palette-card {
  padding: var(--space-lg);
  transition: all var(--transition-smooth);
}

.palette-card__swatches {
  display: flex;
  gap: 4px;
  margin-bottom: var(--space-md);
  height: 56px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.palette-card__swatch {
  flex: 1;
  transition: flex var(--transition-smooth);
  cursor: pointer;
  position: relative;
}

.palette-card__swatch:hover {
  flex: 2;
}

.palette-card__swatch-tooltip {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--ff-mono);
  font-size: 10px;
  color: var(--clr-text-muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
}

.palette-card__swatch:hover .palette-card__swatch-tooltip {
  opacity: 1;
}

.palette-card__name {
  font-family: var(--ff-body);
  font-weight: 600;
  color: var(--clr-white);
  font-size: var(--fs-base);
}

.palette-card__css {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-text-dim);
  margin-top: 4px;
}

/* --- Share / Custom Countdown Section --- */
.share-section {
  padding: var(--space-section) 0;
  position: relative;
  z-index: 1;
}

.share-card {
  padding: var(--space-xl);
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.share-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(232, 145, 58, 0.05), rgba(196, 77, 43, 0.03));
  pointer-events: none;
}

.share-card h2 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-sm);
  position: relative;
}

.share-card p {
  color: var(--clr-text-muted);
  margin-bottom: var(--space-lg);
  position: relative;
}

.share-form {
  display: flex;
  gap: var(--space-xs);
  max-width: 460px;
  margin: 0 auto;
  position: relative;
}

.share-form__input {
  flex: 1;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--clr-glass-border);
  background: var(--clr-glass);
  color: var(--clr-white);
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}

.share-form__input::placeholder {
  color: var(--clr-text-dim);
}

.share-form__input:focus {
  border-color: var(--clr-amber);
}

.share-link-output {
  margin-top: var(--space-md);
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-sage);
  min-height: 1.5em;
  position: relative;
}

/* --- Pages Path Section --- */
.path-section {
  padding: var(--space-section) 0;
  position: relative;
  z-index: 1;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
}

.path-card {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: all var(--transition-smooth);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.path-card::after {
  content: '→';
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: var(--fs-lg);
  color: var(--clr-text-dim);
  transition: all var(--transition-fast);
}

.path-card:hover::after {
  color: var(--clr-amber);
  transform: translateX(4px);
}

.path-card__number {
  font-family: var(--ff-mono);
  font-size: var(--fs-xs);
  color: var(--clr-amber);
  letter-spacing: 0.1em;
}

.path-card h3 {
  font-size: var(--fs-lg);
}

.path-card p {
  color: var(--clr-text-muted);
  font-size: var(--fs-sm);
}

/* --- Footer --- */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--clr-glass-border);
  position: relative;
  z-index: 1;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__brand {
  font-family: var(--ff-display);
  font-size: var(--fs-base);
  color: var(--clr-text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-md);
}

.footer__link {
  font-size: var(--fs-sm);
  color: var(--clr-text-dim);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--clr-amber);
}

.footer__copy {
  width: 100%;
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--clr-text-dim);
  margin-top: var(--space-md);
}

/* --- Animations --- */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Noscript Fallback --- */
noscript .countdown-card__value {
  font-size: var(--fs-lg);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(11, 15, 26, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-md);
    border-bottom: 1px solid var(--clr-glass-border);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .countdown-grid {
    grid-template-columns: 1fr;
  }

  .path-grid {
    grid-template-columns: 1fr;
  }

  .share-form {
    flex-direction: column;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .checklist-tabs {
    gap: 4px;
  }
  .checklist-tab {
    padding: 8px 14px;
    font-size: var(--fs-xs);
  }
}

/* --- Print --- */
@media print {
  body::before, .nav, .hero__actions, .share-section { display: none; }
  body { background: #fff; color: #111; }
  h1, h2, h3 { color: #111; }
  .glass { background: #f5f5f5; border: 1px solid #ddd; }
}

/* --- Focus Styles --- */
:focus-visible {
  outline: 2px solid var(--clr-amber);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Palette Apply Button --- */
.palette-apply-btn {
  margin-top: var(--space-sm);
  width: 100%;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--clr-glass);
  border: 1px solid var(--clr-glass-border);
  color: var(--clr-text);
  font-size: var(--fs-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--ff-body);
}

.palette-apply-btn:hover {
  background: var(--clr-glass-hover);
  border-color: var(--clr-amber);
  color: var(--clr-amber);
  transform: translateY(-1px);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}