/* =====================================================
   Burning Mate Landing — design tokens
   ===================================================== */
:root {
  /* Brand (from app ColorDeck + launcher icon) */
  --color-flame-a: #f0544c;      /* coral red (launcher flame) */
  --color-flame-b: #ff8533;      /* accent500 */
  --color-flame-c: #ffb347;      /* warm glow */
  --color-primary: #2f80ed;      /* primary500 */
  --color-primary-deep: #1a4d8f; /* primary900 */

  --color-surface: #fffdfa;      /* warm white */
  --color-surface-blue: #f2f7fd; /* cool tint */
  --color-ink: #1a1a1a;          /* neutral900 */
  --color-ink-sub: #616161;      /* neutral600 */
  --color-line: #ece9e4;

  /* Flame gradient: reserved for flame moments (hero em, flame report) */
  --grad-flame: linear-gradient(120deg, var(--color-flame-a) 10%, var(--color-flame-b) 55%, var(--color-flame-c) 100%);
  /* Primary gradient: default accent across the page (matches app primary) */
  --grad-primary: linear-gradient(120deg, var(--color-primary-deep) 0%, var(--color-primary) 55%, #6ba4f3 100%);

  /* Type scale */
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-hero: clamp(2.5rem, 1.4rem + 5.5vw, 4.75rem);
  --text-h2: clamp(1.75rem, 1.2rem + 2.6vw, 3rem);
  --text-h3: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);

  /* Rhythm */
  --space-section: clamp(4.5rem, 3rem + 6vw, 9rem);
  --space-gutter: clamp(1.25rem, 4vw, 3rem);
  --width-content: 72rem;

  /* Motion */
  --duration-fast: 180ms;
  --duration-normal: 400ms;
  --duration-slow: 700ms;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  --radius-card: 1.5rem;
  --shadow-card: 0 20px 60px -20px rgba(26, 26, 26, 0.18);
  --shadow-chip: 0 12px 32px -8px rgba(47, 128, 237, 0.4);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", sans-serif;
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-ink);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  word-break: keep-all; /* Korean: never break inside a word */
  overflow-wrap: break-word;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 800;
  text-wrap: balance;
}

em {
  font-style: normal;
}

.flame-text {
  background: var(--grad-flame);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.accent-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.br-desktop {
  display: none;
}

/* =====================================================
   Header
   ===================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  transition: background-color var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}

.site-header.is-scrolled {
  background: rgba(255, 253, 250, 0.85);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--color-line);
}

.header-inner {
  max-width: var(--width-content);
  margin-inline: auto;
  padding: 0.9rem var(--space-gutter);
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  border-radius: 0.6rem;
}

.site-nav {
  display: none;
  gap: 1.75rem;
  margin-inline: auto;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-ink-sub);
}

.site-nav a {
  position: relative;
  padding-block: 0.25rem;
  transition: color var(--duration-fast) ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.site-nav a:hover {
  color: var(--color-ink);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-cta {
  margin-left: auto;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  border-radius: 999px;
  transition: transform var(--duration-fast) var(--ease-out-expo), box-shadow var(--duration-fast) ease;
}

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: var(--shadow-chip);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -8px rgba(47, 128, 237, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-sm {
  padding: 0.55rem 1.2rem;
  font-size: 0.9rem;
}

/* Store buttons */
.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.store-buttons-center {
  justify-content: center;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 1.4rem;
  border-radius: 0.9rem;
  background: var(--color-ink);
  color: #fff;
  min-width: 11rem;
  transition: transform var(--duration-fast) var(--ease-out-expo), box-shadow var(--duration-fast) ease;
}

.store-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 36px -14px rgba(26, 26, 26, 0.5);
}

.store-btn:active {
  transform: translateY(-1px);
}

.store-btn-label {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  font-weight: 700;
  font-size: 1.05rem;
}

.store-btn-label small {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.75;
  letter-spacing: 0.02em;
}

.store-btn-light {
  background: #fff;
  color: var(--color-ink);
}

.store-btn-light:hover {
  box-shadow: 0 18px 36px -14px rgba(26, 26, 26, 0.35);
}

/* =====================================================
   Hero
   ===================================================== */
.hero {
  position: relative;
  padding: clamp(7rem, 5rem + 6vw, 11rem) var(--space-gutter) var(--space-section);
  overflow: clip;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}

.hero-glow-a {
  width: 46rem;
  height: 46rem;
  top: -18rem;
  right: -14rem;
  background: radial-gradient(circle, rgba(47, 128, 237, 0.32), transparent 65%);
}

.hero-glow-b {
  width: 34rem;
  height: 34rem;
  bottom: -16rem;
  left: -12rem;
  background: radial-gradient(circle, rgba(255, 133, 51, 0.22), transparent 65%);
}

.hero-grain {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image: radial-gradient(rgba(26, 26, 26, 0.05) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
}

.hero-inner {
  max-width: var(--width-content);
  margin-inline: auto;
  display: grid;
  gap: 3.5rem;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-primary);
  background: rgba(47, 128, 237, 0.08);
  border: 1px solid rgba(47, 128, 237, 0.22);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.eyebrow-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--grad-primary);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.55; }
}

.hero-title {
  font-size: var(--text-hero);
  font-weight: 900;
  margin-bottom: 2.5rem;
}

.hero-title span {
  display: block;
}

.hero-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-ink-sub);
}

/* Phone visual */
.hero-visual {
  display: flex;
  justify-content: center;
}

.phone-wrap {
  position: relative;
  width: min(21rem, 78vw);
}

.phone-img {
  filter: drop-shadow(0 40px 80px rgba(26, 26, 26, 0.28));
  animation: floaty 7s ease-in-out infinite;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.float-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 1rem;
  padding: 0.65rem 1rem;
  box-shadow: 0 16px 44px -12px rgba(26, 26, 26, 0.25);
  font-size: 0.85rem;
  line-height: 1.25;
  white-space: nowrap;
}

.float-chip strong {
  display: block;
  font-weight: 800;
}

.float-chip small {
  color: var(--color-ink-sub);
  font-size: 0.72rem;
}

.chip-emoji {
  font-size: 1.5rem;
}

.chip-flame {
  top: 12%;
  right: -14%;
  animation: floaty 6s ease-in-out 0.6s infinite;
}

.chip-point {
  bottom: 16%;
  left: -16%;
  animation: floaty 6.5s ease-in-out 1.2s infinite;
}

/* =====================================================
   Feature rows
   ===================================================== */
.feature {
  padding: var(--space-section) var(--space-gutter) 0;
}

.feature-inner {
  max-width: var(--width-content);
  margin-inline: auto;
  display: grid;
  gap: 3rem;
  align-items: center;
}

.tag {
  display: inline-block;
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.tag-blue { color: var(--color-primary); background: rgba(47, 128, 237, 0.1); }
.tag-orange { color: var(--color-flame-a); background: rgba(240, 84, 76, 0.1); }
.tag-gold { color: #b8860b; background: rgba(255, 179, 71, 0.18); }

.feature h2 {
  font-size: var(--text-h2);
  margin-bottom: 1.25rem;
}

.feature-desc {
  color: var(--color-ink-sub);
  margin-bottom: 1.75rem;
  max-width: 30rem;
}

.feature-points {
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.feature-points li {
  position: relative;
  padding-left: 1.6rem;
  font-size: 0.95rem;
  color: var(--color-ink-sub);
}

.feature-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--grad-primary);
  opacity: 0.85;
}

.feature-points strong {
  color: var(--color-ink);
  font-weight: 700;
}

/* Phone in a tinted card */
.feature-visual {
  display: flex;
  justify-content: center;
}

.phone-card {
  width: min(26rem, 100%);
  border-radius: var(--radius-card);
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.5rem, 4vw, 2.5rem) 0;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.phone-card img {
  transform: translateY(6px);
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.phone-card:hover img {
  transform: translateY(-6px) scale(1.02);
}

.tint-blue { background: linear-gradient(160deg, #e8f2fd, #c4dcf9); }
.tint-navy { background: linear-gradient(160deg, #dce9fb, #a9c7f0); }
.tint-gold { background: linear-gradient(160deg, #fff0e5, #ffd6b8); }

/* =====================================================
   Flame report (signature section)
   ===================================================== */
.flame-section {
  margin-top: var(--space-section);
  padding: var(--space-section) var(--space-gutter);
  background:
    radial-gradient(70% 90% at 50% 110%, rgba(240, 84, 76, 0.32), transparent 70%),
    radial-gradient(50% 60% at 80% -10%, rgba(255, 133, 51, 0.16), transparent 70%),
    #191410;
  color: #fff;
  text-align: center;
}

.flame-inner {
  max-width: 52rem;
  margin-inline: auto;
}

.flame-section .tag-orange {
  background: rgba(255, 133, 51, 0.16);
  color: var(--color-flame-c);
}

.flame-section h2 {
  font-size: var(--text-h2);
  margin-bottom: 1.25rem;
}

.flame-desc {
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 3rem;
}

.flame-gauge {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: clamp(0.4rem, 2vw, 1.4rem);
}

.flame-step {
  --intensity: 0.35;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.55);
  font-family: inherit;
  padding: 0.5rem clamp(0.2rem, 1.5vw, 0.9rem);
  border-radius: 1rem;
  transition: transform var(--duration-normal) var(--ease-out-expo), background-color var(--duration-normal) ease;
}

.flame-step:hover,
.flame-step:focus-visible {
  background: rgba(255, 255, 255, 0.06);
}

.flame-icon {
  font-size: calc(1.4rem + var(--level, 1) * 0.55rem);
  filter: grayscale(0.9) opacity(0.45);
  transition: filter var(--duration-normal) ease, transform var(--duration-normal) var(--ease-out-expo);
}

.flame-step[data-level="1"] { --level: 1; }
.flame-step[data-level="2"] { --level: 2; }
.flame-step[data-level="3"] { --level: 3; }
.flame-step[data-level="4"] { --level: 4; }
.flame-step[data-level="5"] { --level: 5; }

.flame-step.is-lit {
  color: #fff;
  transform: translateY(-6px);
}

.flame-step.is-lit .flame-icon {
  filter: grayscale(0) opacity(1) drop-shadow(0 0 18px rgba(255, 133, 51, 0.8));
  animation: flicker 1.4s ease-in-out infinite;
}

@keyframes flicker {
  0%, 100% { transform: scale(1) rotate(0deg); }
  30% { transform: scale(1.08) rotate(-2deg); }
  60% { transform: scale(0.97) rotate(2deg); }
}

.flame-lv {
  font-weight: 800;
  font-size: 0.85rem;
}

.flame-cap {
  font-size: 0.72rem;
  opacity: 0.7;
}

.flame-hint {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.55);
  min-height: 1.5em;
  transition: color var(--duration-normal) ease;
}

.flame-hint.is-active {
  color: var(--color-flame-c);
  font-weight: 700;
}

/* =====================================================
   Bento sub features
   ===================================================== */
.bento {
  padding: var(--space-section) var(--space-gutter) 0;
  max-width: var(--width-content);
  margin-inline: auto;
}

.bento-heading {
  font-size: var(--text-h2);
  text-align: center;
  margin-bottom: 3rem;
}

.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.bento-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: #fff;
  padding: 1.75rem;
  transition: transform var(--duration-normal) var(--ease-out-expo), box-shadow var(--duration-normal) ease, border-color var(--duration-normal) ease;
}

.bento-card:hover {
  transform: translateY(-6px);
  border-color: rgba(47, 128, 237, 0.35);
  box-shadow: 0 24px 48px -24px rgba(47, 128, 237, 0.35);
}

.bento-emoji {
  font-size: 1.9rem;
  display: block;
  margin-bottom: 0.9rem;
}

.bento-card h3 {
  font-size: var(--text-h3);
  margin-bottom: 0.4rem;
}

.bento-card p {
  font-size: 0.92rem;
  color: var(--color-ink-sub);
}

/* =====================================================
   How it works
   ===================================================== */
.how {
  padding: var(--space-section) var(--space-gutter) 0;
}

.how-inner {
  max-width: var(--width-content);
  margin-inline: auto;
  text-align: center;
}

.how h2 {
  font-size: var(--text-h2);
  margin-bottom: 3rem;
}

.how-steps {
  list-style: none;
  display: grid;
  gap: 2.5rem;
  counter-reset: step;
  text-align: left;
}

.how-step {
  position: relative;
  padding: 2rem 1.75rem;
  border-radius: var(--radius-card);
  background: var(--color-surface-blue);
  border: 1px solid #e3edf9;
}

.how-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  font-weight: 900;
  font-size: 1.1rem;
  margin-bottom: 1.1rem;
  box-shadow: var(--shadow-chip);
}

.how-step h3 {
  font-size: var(--text-h3);
  margin-bottom: 0.5rem;
}

.how-step p {
  font-size: 0.95rem;
  color: var(--color-ink-sub);
}

/* =====================================================
   CTA
   ===================================================== */
.cta {
  padding: var(--space-section) var(--space-gutter);
}

.cta-card {
  position: relative;
  max-width: var(--width-content);
  margin-inline: auto;
  border-radius: 2rem;
  padding: clamp(3rem, 2rem + 5vw, 5.5rem) var(--space-gutter);
  text-align: center;
  color: #fff;
  overflow: hidden;
  background:
    radial-gradient(80% 120% at 50% 130%, rgba(255, 133, 51, 0.4), transparent 60%),
    linear-gradient(135deg, #2f80ed, #2369c1 45%, #1a4d8f);
  box-shadow: 0 40px 90px -30px rgba(47, 128, 237, 0.55);
}

.cta-glow {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 20px 20px;
  mask-image: linear-gradient(180deg, transparent, #000);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000);
  pointer-events: none;
}

.cta-icon {
  margin: 0 auto 1.5rem;
  border-radius: 1.2rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.cta h2 {
  font-size: var(--text-h2);
  margin-bottom: 1rem;
}

.cta p {
  opacity: 0.9;
  margin-bottom: 2.25rem;
}

/* =====================================================
   Footer
   ===================================================== */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 2.5rem var(--space-gutter);
}

.footer-inner {
  max-width: var(--width-content);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.75rem;
  text-align: left;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
}

.footer-brand img {
  border-radius: 0.5rem;
}

.footer-biz {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  font-size: 0.85rem;
}

.footer-biz-row {
  display: flex;
  gap: 0.75rem;
}

.footer-biz-row dt {
  color: var(--color-ink-sub);
  flex-shrink: 0;
}

.footer-biz-row dd {
  margin: 0;
  color: var(--color-ink);
}

.footer-biz a {
  color: var(--color-primary);
}

.footer-legal {
  display: flex;
  gap: 1.75rem;
  font-size: 0.85rem;
  color: var(--color-ink-sub);
}

.footer-legal a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-legal-strong {
  font-weight: 700;
  color: var(--color-ink);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-ink-sub);
}

/* =====================================================
   Scroll reveal
   Hidden states are scoped to html.js so content stays
   visible for crawlers and users without JavaScript.
   ===================================================== */
.reveal,
.reveal-scale {
  transition: opacity var(--duration-slow) var(--ease-out-expo), transform var(--duration-slow) var(--ease-out-expo);
}

html.js .reveal,
html.js .reveal-scale {
  opacity: 0;
  will-change: opacity, transform;
}

html.js .reveal {
  transform: translateY(28px);
}

html.js .reveal-scale {
  transform: translateY(28px) scale(0.96);
}

html.js .reveal.is-visible,
html.js .reveal-scale.is-visible {
  opacity: 1;
  transform: none;
  will-change: auto;
}

.d1 { transition-delay: 90ms; }
.d2 { transition-delay: 180ms; }
.d3 { transition-delay: 270ms; }
.d4 { transition-delay: 360ms; }
.d5 { transition-delay: 450ms; }

/* =====================================================
   Responsive
   ===================================================== */
@media (min-width: 640px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .how-steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .br-desktop {
    display: inline;
  }

  .site-nav {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .feature-inner {
    grid-template-columns: 1fr 1fr;
  }

  .feature-reverse .feature-copy {
    order: 2;
  }

  .feature-reverse .feature-visual {
    order: 1;
  }

  .bento-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .bento-card {
    grid-column: span 2;
  }

  /* 5 cards on a 6-col grid: first row 3, second row 2 centered */
  .bento-card:nth-child(4) {
    grid-column: 2 / span 2;
  }
}

/* =====================================================
   Reduced motion
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .reveal-scale {
    opacity: 1;
    transform: none;
  }
}