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

html {
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

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

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

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: background-color 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
  background-color: rgba(13, 13, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--glass-border);
}

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

.navbar-logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
}

.navbar-menu a:hover {
  color: var(--text-primary);
}

.navbar-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.navbar-menu a:hover::after {
  width: 100%;
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary {
  background: linear-gradient(135deg, #8B5CF6 0%, #3B82F6 50%, #8B5CF6 100%);
  background-size: 200% 200%;
  color: var(--color-on-accent);
  box-shadow: 0 4px 24px rgba(139, 92, 246, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-position 0.4s ease;
}

.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(139, 92, 246, 0.45);
  background-position: 100% 100%;
}

.btn-secondary {
  background: var(--glass-low);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  background: var(--glass-mid);
  box-shadow: 0 4px 16px rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
  border-radius: 10px;
}

/* ===== Section Common ===== */
section {
  padding: 100px 0;
}

section h2 {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Section divider */
section + section::before {
  content: '';
  display: block;
  width: 200px;
  height: 2px;
  margin: 0 auto 0;
  background: linear-gradient(90deg, transparent, var(--accent-purple), var(--accent-blue), transparent);
  position: relative;
  top: -50px;
}

section .section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 60px;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 100px;
  overflow: hidden;
}

/* Floating glow orbs */
@keyframes float-orb-1 {
  0%, 100% { transform: translate(-50%, -20%) scale(1); }
  33% { transform: translate(-40%, -10%) scale(1.1); }
  66% { transform: translate(-60%, -25%) scale(0.95); }
}

@keyframes float-orb-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -40px) scale(1.15); }
  66% { transform: translate(-20px, 20px) scale(0.9); }
}

@keyframes float-orb-3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-40px, -30px) scale(1.1); }
}

#hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.18) 0%, transparent 70%);
  pointer-events: none;
  animation: float-orb-1 12s ease-in-out infinite;
}

#hero::after {
  content: '';
  position: absolute;
  top: 10%;
  left: 60%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
  animation: float-orb-2 15s ease-in-out infinite;
}

.hero-content::before {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
  animation: float-orb-3 18s ease-in-out infinite;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

@keyframes glow-pulse {
  0%, 100% { text-shadow: 0 0 20px rgba(139, 92, 246, 0.3), 0 0 40px rgba(59, 130, 246, 0.1); }
  50% { text-shadow: 0 0 30px rgba(139, 92, 246, 0.5), 0 0 60px rgba(59, 130, 246, 0.2); }
}

#hero h1 {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  animation: glow-pulse 4s ease-in-out infinite;
}

#hero h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Glass Card ===== */
.glass-card {
  background: var(--glass-low);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 36px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 30px rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.4);
}

/* ===== Features ===== */
#features {
  background: var(--bg-surface);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card .icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card .icon-wrap svg {
  width: 28px;
  height: 28px;
  color: var(--color-on-accent);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ===== Screenshots Gallery ===== */
#screenshots {
  background: var(--bg-base);
}

.gallery-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Main Image Area */
.gallery-main-wrap {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: var(--bg-card);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(139, 92, 246, 0.1);
  aspect-ratio: 16 / 9;
  cursor: zoom-in;
}

.gallery-main-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: var(--bg-card);
  transition: transform 0.35s ease, opacity 0.25s ease;
}

.gallery-main-img.switching {
  opacity: 0;
  transform: scale(0.97);
}

.gallery-main-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  cursor: zoom-in;
}

.gallery-main-overlay:focus-visible {
  outline: 2px solid var(--accent-purple);
  outline-offset: -2px;
}

/* Zoom icon hint on hover */
.gallery-main-wrap::after {
  content: '';
  position: absolute;
  bottom: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.55) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FAFAFA' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3Cline x1='11' y1='8' x2='11' y2='14'/%3E%3Cline x1='8' y1='11' x2='14' y2='11'/%3E%3C/svg%3E") center / 20px no-repeat;
  backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
  z-index: 3;
}

.gallery-main-wrap:hover::after {
  opacity: 1;
}

/* Caption bar */
.gallery-main-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 10px 20px;
  background: linear-gradient(to top, rgba(13, 13, 20, 0.92), transparent);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  pointer-events: none;
  z-index: 3;
  letter-spacing: 0.01em;
}

/* Thumbnails Row */
.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
}

.gallery-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0;
  background: var(--glass-low);
  border: 2px solid var(--glass-border);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
  outline: none;
}

.gallery-thumb img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  transition: opacity 0.2s ease;
}

.gallery-thumb span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0 8px 8px;
  text-align: center;
  transition: color 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.gallery-thumb:hover {
  border-color: rgba(139, 92, 246, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.2);
}

.gallery-thumb:hover span {
  color: var(--text-primary);
}

.gallery-thumb:focus-visible {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
}

.gallery-thumb.active {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.35), 0 6px 20px rgba(139, 92, 246, 0.25);
}

.gallery-thumb.active span {
  color: var(--accent-purple);
}

/* ===== Lightbox ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: zoom-out;
}

.lightbox-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: min(1200px, calc(100vw - 48px));
  max-height: calc(100vh - 80px);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.lightbox.open .lightbox-content {
  transform: scale(1);
}

.lightbox-content img {
  max-width: 100%;
  max-height: calc(100vh - 120px);
  width: auto;
  height: auto;
  display: block;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.7), 0 0 40px rgba(139, 92, 246, 0.15);
  object-fit: contain;
}

.lightbox-caption {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 0.02em;
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  color: var(--text-primary);
}

.lightbox-close svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.lightbox-close:hover {
  background: rgba(139, 92, 246, 0.3);
  border-color: rgba(139, 92, 246, 0.5);
  transform: scale(1.08);
}

.lightbox-close:focus-visible {
  outline: 2px solid var(--accent-purple);
  outline-offset: 2px;
}

/* ===== How It Works ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-on-accent);
}

.step h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 280px;
  margin: 0 auto;
}

/* Step connector line */
.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(16.66% + 28px);
  right: calc(16.66% + 28px);
  height: 2px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue));
  opacity: 0.3;
}

/* ===== Web Access ===== */
#web-access {
  background: var(--bg-surface);
}

.web-access-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 860px;
  margin: 0 auto;
}

.web-access-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.web-access-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  flex-shrink: 0;
}

.web-access-icon--blue {
  background: linear-gradient(135deg, #3B82F6 0%, #06B6D4 100%);
}

.web-access-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-on-accent);
}

.web-access-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.web-access-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 28px;
  flex: 1;
}

/* ===== Download ===== */
#download {
  background: var(--bg-surface);
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: 480px;
  margin: 0 auto;
}

.download-card {
  text-align: center;
}

.download-card .card-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.download-card .card-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-on-accent);
}

.download-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.download-card .card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.download-card .btn {
  margin-bottom: 16px;
}

.download-card .card-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

.download-chrome-hint {
  font-size: 0.78rem;
  color: var(--text-secondary);
  opacity: 0.55;
  line-height: 1.65;
  margin-top: 14px;
}

.download-chrome-hint-en {
  color: rgba(180, 180, 210, 0.75);
}

/* Hero 섹션의 다운로드 안내는 버튼 아래 중앙 정렬 */
.hero-content .download-chrome-hint {
  margin-top: 16px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Feedback ===== */
#feedback {
  background: var(--bg-base);
}

.feedback-card {
  max-width: 640px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.radio-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.radio-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass-low);
  transition: border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.radio-btn:hover {
  border-color: rgba(139, 92, 246, 0.4);
}

.radio-btn input[type="radio"] {
  display: none;
}

.radio-custom {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--glass-border);
  position: relative;
  transition: border-color 0.3s ease;
}

.radio-btn input[type="radio"]:checked ~ .radio-custom {
  border-color: var(--accent-purple);
}

.radio-btn input[type="radio"]:checked ~ .radio-custom::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient);
}

.radio-btn input[type="radio"]:checked ~ .radio-label {
  color: var(--text-primary);
}

.radio-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.3s ease;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.btn-submit {
  align-self: flex-start;
  padding: 14px 40px;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

.form-hint a {
  color: var(--accent-purple);
  transition: opacity 0.2s;
}

.form-hint a:hover {
  opacity: 0.8;
}

/* Feedback Result */
.feedback-result {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  text-align: center;
}

.feedback-result.success {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.feedback-result.error {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* ===== Sponsor ===== */
#sponsor {
  padding: 48px 0;
  background: var(--bg-base);
}

.sponsor-label {
  text-align: center;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
  opacity: 0.5;
  margin-bottom: 14px;
}

.sponsor-card {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 32px;
  border-radius: 18px;
  opacity: 0.82;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: opacity 0.25s ease, transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.sponsor-card:hover {
  opacity: 1;
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35), 0 0 24px rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.3);
}

.sponsor-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.18), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(139, 92, 246, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sponsor-icon svg {
  width: 26px;
  height: 26px;
  color: var(--accent-purple);
}

.sponsor-body {
  flex: 1;
  min-width: 0;
}

.sponsor-brand {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-purple);
  opacity: 0.8;
  margin-bottom: 2px;
}

.sponsor-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.sponsor-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sponsor-cta {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-purple);
  opacity: 0.8;
  transition: opacity 0.2s ease, gap 0.2s ease;
}

.sponsor-card:hover .sponsor-cta {
  opacity: 1;
  gap: 9px;
}

/* 인라인 텍스트 광고 (다운로드 섹션) */
.sponsor-inline-ad {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-secondary);
  opacity: 0.6;
  transition: opacity 0.2s ease;
}

.sponsor-inline-ad a {
  color: var(--accent-purple);
  text-decoration: underline;
  text-underline-offset: 2px;
  opacity: 0.85;
  transition: opacity 0.2s ease;
}

.sponsor-inline-ad a:hover {
  opacity: 1;
}

/* 반응형 */
@media (max-width: 600px) {
  .sponsor-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
  }

  .sponsor-desc {
    white-space: normal;
  }

  .sponsor-cta {
    align-self: flex-end;
  }
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--glass-border);
  padding: 40px 0;
}

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

footer .copyright {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

footer .contact {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

footer .contact a {
  color: var(--accent-purple);
  transition: opacity 0.2s;
}

footer .contact a:hover {
  opacity: 0.8;
}

/* ===== Animations ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger delay */
.fade-in-up:nth-child(2) { transition-delay: 0.1s; }
.fade-in-up:nth-child(3) { transition-delay: 0.2s; }
.fade-in-left:nth-child(1) { transition-delay: 0s; }
.fade-in-right:nth-child(3) { transition-delay: 0.2s; }

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 1200px) {
  #hero h1 {
    font-size: 3.25rem;
  }
}

@media (max-width: 960px) {
  .gallery-thumbs {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  /* Navigation */
  .hamburger {
    display: flex;
  }

  .navbar-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-surface);
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    transition: right 0.35s ease;
    border-left: 1px solid var(--glass-border);
  }

  .navbar-menu.open {
    right: 0;
  }

  .navbar-menu a {
    font-size: 1.1rem;
  }

  /* Hero */
  #hero h1 {
    font-size: 2.25rem;
  }

  #hero p {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 280px;
  }

  /* Grids */
  .feature-grid,
  .steps,
  .download-grid,
  .web-access-grid {
    grid-template-columns: 1fr;
  }

  /* Gallery */
  .gallery-thumbs {
    grid-template-columns: repeat(3, 1fr);
  }

  .radio-group {
    flex-direction: column;
  }

  .btn-submit {
    align-self: stretch;
  }

  .steps::before {
    display: none;
  }

  /* Section */
  section {
    padding: 72px 0;
  }

  section h2 {
    font-size: 1.75rem;
  }

  /* Footer */
  footer .container {
    flex-direction: column;
    text-align: center;
  }
}

/* Mobile overlay */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.menu-overlay.active {
  opacity: 1;
  pointer-events: auto;
}