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

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;
  --accent: #4f8cff;
  --accent-hover: #6ba0ff;
  --accent-glow: rgba(79, 140, 255, 0.25);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --nav-height: 64px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 10, 26, 0.8);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(10, 10, 26, 0.95);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
}

.nav-logo:hover {
  color: var(--text-primary);
}

.nav-logo img {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-dropdown {
  position: relative;
}

.lang-current {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
}

.lang-current:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.lang-chevron {
  transition: transform var(--transition);
}

.lang-dropdown.open .lang-chevron {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 120px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.2s ease;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.lang-dropdown.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: block;
  width: 100%;
  padding: 8px 14px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}

.lang-option:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--accent);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
  border-radius: var(--radius);
}

.btn-block {
  width: 100%;
}

.btn-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  /* 100vh 풀-스크린이 화면 높은 모니터에서 nav 아래 공백을 크게 만들어
     상단 절반이 비어 보이던 문제 해결 — 콘텐츠 기반 + 적정 상하 패딩 */
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + 24px);
  padding-bottom: 32px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79, 140, 255, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(100, 60, 255, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  align-items: center;
  padding-top: 8px;
  padding-bottom: 24px;
}

.hero-patent {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 18px;
  padding: 7px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.4px;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  border-radius: 999px;
  box-shadow: 0 0 20px var(--accent-glow);
  animation: heroPatentPulse 2.6s ease-in-out infinite;
}
.hero-patent svg { flex-shrink: 0; }

@keyframes heroPatentPulse {
  0%, 100% { box-shadow: 0 0 14px var(--accent-glow); }
  50%      { box-shadow: 0 0 26px var(--accent-glow); }
}

.hero-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.hero-logo {
  border-radius: 14px;
  flex-shrink: 0;
  box-shadow: 0 6px 24px rgba(79, 140, 255, 0.2);
}

.hero-brand h1 {
  margin-bottom: 0;
  line-height: 1;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.5;
}

.hero-subtitle strong {
  color: var(--accent);
}

.hero-desc {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

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

.hero-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 16px;
}

.hero-image {
  position: relative;
}

.hero-image-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 80px rgba(79, 140, 255, 0.08);
}

.hero-image-frame img {
  width: 100%;
  display: block;
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 17px;
  color: var(--text-secondary);
}

/* ===== Features ===== */
.features {
  background: var(--bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: all var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(79, 140, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.feature-tiers {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 4px;
}

.feature-tier {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 10px;
  line-height: 1.4;
  letter-spacing: 0.3px;
}

.feature-tier-free {
  background: rgba(160, 160, 184, 0.15);
  color: var(--text-muted);
}

.feature-tier-basic {
  background: rgba(79, 140, 255, 0.15);
  color: var(--accent);
}

.feature-tier-pro {
  background: rgba(155, 89, 255, 0.15);
  color: #9b59ff;
}

.feature-tier-beta {
  background: rgba(46, 204, 113, 0.18);
  color: #2ecc71;
}

.feature-tier-soon {
  background: rgba(255, 193, 7, 0.15);
  color: #ffc107;
}

.feature-card-soon {
  opacity: 0.6;
  filter: grayscale(0.25);
}

.feature-card-soon:hover {
  opacity: 0.85;
}

/* ===== Gallery ===== */
.gallery-showcase {
  max-width: 960px;
  margin: 0 auto;
}

.gallery-main {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.gallery-main img {
  width: 100%;
}

.gallery-caption {
  text-align: center;
  margin-top: 24px;
}

.gallery-caption h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.gallery-caption p {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ===== Pricing ===== */
.pricing {
  background: var(--bg-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  max-width: 1140px;
  margin: 0 auto;
}

.pricing-tbd {
  max-width: 520px;
  margin: 0 auto;
  padding: 56px 32px;
  text-align: center;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

.pricing-tbd-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 88px;
  height: 88px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: rgba(255, 193, 7, 0.12);
  color: #ffc107;
}

.pricing-tbd h3 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  margin-bottom: 10px;
  color: #ffc107;
}

.pricing-tbd p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  transition: all var(--transition);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.pricing-card-pro {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

.pricing-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.pricing-badge-pro {
  background: var(--accent);
  color: #fff;
}

.pricing-card h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-price {
  margin-bottom: 28px;
}

.price-amount {
  font-size: 36px;
  font-weight: 800;
}

.price-period {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  margin-right: 8px;
}

/* ===== Release Notice (베타 버전 업데이트 안내) ===== */
.release-notice {
  max-width: 1140px;
  margin: 0 auto 48px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.release-notice-tag {
  display: inline-block;
  padding: 6px 14px;
  margin-bottom: 22px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--accent);
  background: var(--accent-glow);
  border-radius: 999px;
}

.release-notice-grid {
  display: grid;
  /* 블록 개수 변동 대응 — 최소 280px 보장하며 자동 배치 (2~3열) */
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px 32px;
}

.release-block h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.release-block ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.release-block li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.release-block li:last-child {
  margin-bottom: 0;
}

.release-block li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.release-block li strong {
  color: var(--text-primary);
  font-weight: 600;
}

.release-block-warn li::before {
  background: #ffc107;
}

.release-block-warn li strong {
  color: #ffd24a;
}

@media (max-width: 768px) {
  .release-notice {
    padding: 24px 20px;
    margin-bottom: 36px;
  }
  .release-notice-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
}

/* ===== Download ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 1140px;
  margin: 0 auto;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  text-align: center;
  transition: all var(--transition);
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.download-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.download-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-card p {
  font-size: 14px;
  color: var(--text-secondary);
}

.download-info {
  font-size: 13px !important;
  color: var(--text-muted) !important;
  margin-bottom: 20px;
}

.download-card-coming {
  opacity: 0.6;
}

.download-card-soon {
  position: relative;
  opacity: 0.72;
  filter: grayscale(0.2);
}

.download-card-soon:hover {
  opacity: 0.92;
  transform: none;
  box-shadow: none;
}

.download-card-soon .btn[disabled] {
  cursor: not-allowed;
  background: rgba(255, 193, 7, 0.1);
  border-color: rgba(255, 193, 7, 0.35);
  color: #ffc107;
  opacity: 1;
}

.download-soon-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  background: rgba(255, 193, 7, 0.18);
  color: #ffc107;
  letter-spacing: 0.3px;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
}

.footer-brand img {
  border-radius: 6px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s ease;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Scroll Animation ===== */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Chat Widget ===== */
.chat-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9998;
}

.chat-fab {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 20px rgba(79, 140, 255, 0.4);
  transition: all var(--transition);
}

.chat-fab:hover {
  background: var(--accent-hover);
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(79, 140, 255, 0.5);
}

.chat-fab-close { display: none; }
.chat-widget.open .chat-fab-icon { display: none; }
.chat-widget.open .chat-fab-close { display: block; }

.chat-panel {
  position: absolute;
  bottom: 72px;
  right: 0;
  width: 380px;
  max-height: 520px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(0.95);
  transition: all 0.25s ease;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.5);
}

.chat-widget.open .chat-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chat-header-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.chat-header-status {
  font-size: 12px;
  color: var(--text-muted);
}

.chat-header-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all var(--transition);
}

.chat-header-close:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 300px;
  max-height: 360px;
}

.chat-msg {
  display: flex;
  max-width: 85%;
}

.chat-msg-bot { align-self: flex-start; }
.chat-msg-user { align-self: flex-end; }

.chat-msg-bubble {
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.6;
  word-break: break-word;
  /* [modify/075] AI 답변은 여러 문단으로 오는데 textContent 로 그려서 줄바꿈이 통째로 뭉개졌다.
     pre-wrap 이면 개행은 살리고 긴 줄은 계속 접힌다(textContent 유지 = XSS 안전). */
  white-space: pre-wrap;
}

.chat-msg-bot .chat-msg-bubble {
  background: var(--bg-card);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.chat-msg-user .chat-msg-bubble {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-msg-typing .chat-msg-bubble {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 14px 18px;
}

.chat-typing-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: chatTyping 1.2s ease-in-out infinite;
}

.chat-typing-dot:nth-child(2) { animation-delay: 0.2s; }
.chat-typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes chatTyping {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}

.chat-input-area {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.chat-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}

.chat-input:focus {
  border-color: var(--accent);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-send {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.chat-send:hover:not(:disabled) {
  background: var(--accent-hover);
}

.chat-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-brand {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

  .section-header h2 {
    font-size: 28px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 14px 24px;
    font-size: 16px;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 40px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-desc br {
    display: none;
  }

  .section {
    padding: 60px 0;
  }

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

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

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

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

@media (max-width: 480px) {
  /* 긴 릴리즈 태그가 알약 안에서 1~2줄로 들어오도록 축소 */
  .release-notice-tag {
    font-size: 0.72rem;
    letter-spacing: 0.2px;
    padding: 5px 12px;
    line-height: 1.5;
  }

  .hero h1 {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .btn-lg {
    padding: 14px 24px;
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .chat-widget { bottom: 16px; right: 16px; }
  .chat-panel {
    width: calc(100vw - 32px);
    max-height: 70vh;
    right: 0;
    bottom: 68px;
  }
  .chat-messages { min-height: 200px; max-height: 50vh; }
}