:root {
  --bg: #060816;
  --bg-soft: rgba(11, 16, 40, 0.78);
  --panel: rgba(9, 14, 35, 0.72);
  --panel-strong: rgba(8, 12, 28, 0.88);
  --panel-border: rgba(255, 255, 255, 0.14);
  --text: #f9fbff;
  --muted: rgba(239, 244, 255, 0.72);
  --accent: #ffd166;
  --accent-strong: #ff9f1c;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --hero-gradient: radial-gradient(circle at top, rgba(255, 209, 102, 0.34), transparent 46%);
  --particle-glow: rgba(255, 209, 102, 0.42);
  --surface-glow: rgba(255, 209, 102, 0.3);
  --button-text: #08111f;
  --button-secondary: rgba(255, 255, 255, 0.08);
  --button-secondary-text: #f9fbff;
  --font-display: "Avenir Next", "Pretendard", "Segoe UI", sans-serif;
  --font-body: "Space Grotesk", "Pretendard", "Apple SD Gothic Neo", sans-serif;
  --transition-fast: 180ms ease;
  --transition-slow: 720ms ease;
}

body[data-theme="heart"] {
  --bg: #180312;
  --bg-soft: rgba(48, 10, 30, 0.78);
  --panel: rgba(56, 10, 35, 0.72);
  --panel-strong: rgba(52, 12, 34, 0.88);
  --panel-border: rgba(255, 196, 220, 0.16);
  --accent: #ff7aa2;
  --accent-strong: #ffc4d8;
  --hero-gradient: radial-gradient(circle at top, rgba(255, 122, 162, 0.36), transparent 48%);
  --particle-glow: rgba(255, 122, 162, 0.48);
  --surface-glow: rgba(255, 122, 162, 0.28);
  --button-text: #2f0717;
}

body[data-theme="neon"] {
  --bg: #020710;
  --bg-soft: rgba(6, 17, 24, 0.8);
  --panel: rgba(5, 20, 31, 0.76);
  --panel-strong: rgba(6, 18, 29, 0.9);
  --panel-border: rgba(94, 244, 255, 0.2);
  --accent: #5ef4ff;
  --accent-strong: #ad6fff;
  --hero-gradient: radial-gradient(circle at top, rgba(94, 244, 255, 0.3), transparent 52%);
  --particle-glow: rgba(94, 244, 255, 0.56);
  --surface-glow: rgba(173, 111, 255, 0.3);
  --button-text: #04131b;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent),
    var(--hero-gradient),
    var(--bg);
  font-family: var(--font-body);
  font-size: 26px;
}

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

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

button,
input,
select {
  font: inherit;
}

strong,
code {
  color: var(--accent);
}

.site-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.hero {
  display: grid;
  gap: 18px;
  padding: 38px;
  border: 1px solid var(--panel-border);
  border-radius: 34px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.06), transparent 60%),
    var(--panel-strong);
  box-shadow: var(--shadow);
}

.eyebrow,
.section-label,
.phase-kicker,
.theme-badge {
  margin: 0;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.hero h1,
.phase-input h1,
.celebration-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 6vw, 88px);
  line-height: 0.95;
}

.hero-copy,
.panel-description,
.phase-subcopy,
.counter-copy {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(18px, 2.1vw, 24px);
  line-height: 1.6;
}

.theme-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--button-text);
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.22);
}

.button-secondary {
  color: var(--button-secondary-text);
  background: var(--button-secondary);
  border-color: var(--panel-border);
}

.content-grid {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.panel {
  padding: 30px;
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.04), transparent 60%),
    var(--panel);
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 50px);
  line-height: 1.02;
}

.panel-preview {
  display: grid;
  gap: 28px;
}

.preview-frame {
  overflow: hidden;
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.03);
}

.feature-list,
.steps-list {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.6;
}

.generator-form {
  margin: 18px 0 24px;
}

.field,
.select-field {
  display: grid;
  gap: 10px;
}

.select-field.is-hidden {
  display: none;
}

.flow-fields {
  display: grid;
  grid-column: 1 / -1;
  grid-row: 1;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.flow-fields.is-hidden {
  display: none;
}

.flow-field {
  display: grid;
  gap: 10px;
}

.field span,
.select-field span,
.flow-field span {
  font-size: 16px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.field input,
.select-field select {
  width: 100%;
  min-height: 117px;
  padding: 0 18px;
  border: 0;
  border-radius: 18px;
  color: var(--text);
  background: transparent;
  outline: none;
}

.flow-value {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 117px;
  padding: 0 18px;
  border: 0;
  border-radius: 18px;
  color: var(--text);
  background: transparent;
  font-size: 24px;
  font-weight: 700;
}

.field input:focus,
.select-field select:focus {
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.06);
}

.theme-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.theme-card {
  display: grid;
  gap: 16px;
  padding: 22px;
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.04);
  align-content: space-between;
}

.theme-name {
  margin: 0 0 8px;
  font-size: 26px;
  font-weight: 700;
}

.theme-description,
.parameter-grid span,
.counter-meta,
.status-copy {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.theme-actions {
  margin-top: auto;
}

.theme-actions .button {
  width: 100%;
}

.steps-list {
  display: grid;
  gap: 10px;
}

.overlay-root {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background: transparent;
}

.overlay-background,
.particle-field {
  position: absolute;
  inset: 0;
}

.aurora,
.grid-glow {
  position: absolute;
  border-radius: 999px;
  filter: blur(30px);
}

.aurora-a {
  top: 7%;
  left: 12%;
  width: 36vw;
  height: 36vw;
  background: var(--surface-glow);
  animation: drift 12s ease-in-out infinite alternate;
}

.aurora-b {
  right: 10%;
  bottom: 16%;
  width: 30vw;
  height: 30vw;
  background: rgba(255, 255, 255, 0.08);
  animation: drift 15s ease-in-out infinite alternate-reverse;
}

.grid-glow {
  inset: 8% 10%;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    linear-gradient(transparent 95%, rgba(255, 255, 255, 0.08) 96%),
    linear-gradient(90deg, transparent 95%, rgba(255, 255, 255, 0.08) 96%);
  background-size: 56px 56px;
  opacity: 0.18;
}

.overlay-stage {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 36px;
}

.overlay-status,
.phase-panel {
  width: min(1320px, 100%);
}

.overlay-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}

.theme-badge {
  padding: 10px 16px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
}

.phase-panel {
  padding: clamp(42px, 5vw, 76px);
  min-height: 760px;
  border: 1px solid var(--panel-border);
  border-radius: 34px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.05), transparent 64%),
    var(--panel-strong);
  box-shadow: var(--shadow);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow),
    filter var(--transition-slow);
  transform: none;
}

.phase-input {
  display: grid;
  align-content: center;
}

.phase-input h1 {
  font-size: clamp(56px, 6.5vw, 96px);
}

.phase-kicker {
  font-size: 16px;
  letter-spacing: 0.32em;
}

.phase-panel.is-hidden {
  display: none;
}

.flow-meta {
  grid-column: 1 / -1;
  margin-top: 14px;
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow),
    filter var(--transition-slow);
}

.flow-meta.is-hidden {
  display: none;
}

.overlay-root[data-phase="fadeout"] .flow-fields,
.overlay-root[data-phase="fadeout"] .flow-meta {
  opacity: 0;
  transform: scale(0.96);
  filter: blur(8px);
}

.date-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.launch-button {
  grid-column: 1 / -1;
  min-height: 102px;
  margin-top: 26px;
  font-size: 36px;
  font-weight: 700;
}

.config-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.config-summary span {
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 16px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.06);
}

.error-message {
  min-height: 34px;
  margin: 28px 0 0;
  color: #ff94aa;
  font-size: 22px;
}

.phase-celebration {
  display: grid;
  place-items: center;
  text-align: center;
}

.counter-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 0;
}

.counter-copy:empty {
  display: none;
}

.celebration-copy {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 24px;
  align-content: center;
  max-width: 1120px;
  margin: 0 auto;
}

.status-copy:empty {
  display: none;
}

.celebration-copy h2 {
  display: grid;
  margin-top: 0;
  font-size: clamp(64px, 7vw, 112px);
}

#celebration-title span {
  display: block;
}

.celebration-copy p:last-child {
  max-width: 920px;
  margin: 0 auto;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.5;
}

.particle {
  position: absolute;
  left: var(--left);
  top: var(--top);
  width: var(--size);
  height: var(--size);
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.96), var(--particle-glow));
  opacity: 0;
  transform: translate3d(0, 0, 0) scale(0.3);
  animation: burst var(--duration) ease-out var(--delay) infinite;
}

.particle-heart {
  clip-path: path("M12 21s-6.7-4.7-9.4-8C-1.9 9.9-.5 5.1 3.3 3.1 6.3 1.5 9.4 2.4 12 5.1c2.6-2.7 5.7-3.6 8.7-2 3.8 2 5.2 6.8.7 9.9C18.7 16.3 12 21 12 21Z");
  background: linear-gradient(135deg, var(--accent), #fff5f8);
}

.particle-neon {
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 0 18px var(--accent);
}

@keyframes drift {
  from {
    transform: translate3d(-18px, 8px, 0) scale(0.98);
  }
  to {
    transform: translate3d(22px, -16px, 0) scale(1.04);
  }
}

@keyframes burst {
  0% {
    opacity: 0;
    transform: translate3d(0, 10px, 0) scale(0.2);
  }
  18% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate3d(var(--travel-x), var(--travel-y), 0) scale(1.28);
  }
}

@media (min-width: 920px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 919px) {
  body {
    font-size: 20px;
  }

  .site-shell {
    padding: 28px 16px 48px;
  }

  .hero,
  .panel,
  .phase-panel {
    padding: 24px;
  }

  .overlay-status {
    flex-direction: column;
    align-items: flex-start;
  }

  .date-form {
    grid-template-columns: 1fr;
  }

  .theme-links,
  .flow-fields {
    grid-template-columns: 1fr;
  }

  .phase-panel {
    transform: none;
  }

  .counter-meta {
    flex-direction: column;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}