:root {
  --bg: #05080a;
  --surface: rgba(13, 20, 24, 0.75);
  --surface-strong: #0d1418;
  --surface-soft: rgba(255, 255, 255, 0.04);
  --text: #e6f2f0;
  --muted: #8fa3a1;
  --border: rgba(130, 195, 187, 0.12);
  --accent: #1cc8b3;
  --accent-strong: #0a9f94;
  --accent-soft: rgba(28, 200, 179, 0.12);
  --shadow: 0 32px 100px rgba(0, 0, 0, 0.45);
  --header: rgba(5, 8, 10, 0.85);
  --danger: #ff7a78;
  --radius: 12px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="light"] {
  --bg: #f2f7f6;
  --surface: rgba(255, 255, 255, 0.85);
  --surface-strong: #ffffff;
  --surface-soft: rgba(17, 48, 52, 0.05);
  --text: #142a2e;
  --muted: #586f70;
  --border: rgba(30, 98, 96, 0.14);
  --accent: #09a99a;
  --accent-strong: #087e78;
  --accent-soft: rgba(9, 169, 154, 0.1);
  --shadow: 0 32px 90px rgba(25, 75, 74, 0.14);
  --header: rgba(242, 247, 246, 0.88);
  --danger: #c95559;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg, #fff);
  border-bottom: 1px solid var(--border, #eee);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  white-space: nowrap;
}

.logo-icon {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 10px;
}

.logo-text {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.8px;
}

.accent {
  color: #635bff;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.main-nav a {
  color: var(--text, #222);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color .2s ease;
}

.main-nav a:hover {
  color: #635bff;
}

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

.lang-toggle,
.theme-toggle,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border, #e5e7eb);
  border-radius: 10px;
  background: transparent;
  color: var(--text, #222);
  cursor: pointer;
  font-size: 14px;
  transition: background .2s ease, border-color .2s ease;
}

.lang-toggle:hover,
.theme-toggle:hover,
.nav-toggle:hover {
  background: var(--hover, #f3f4f6);
}

.theme-icon-dark {
  display: none;
}

.nav-toggle {
  display: none;
  width: 40px;
  padding: 0;
  font-size: 18px;
}

@media (max-width: 768px) {
  .header-inner {
    min-height: 64px;
  }

  .logo-text {
    font-size: 21px;
  }

  .logo-icon {
    width: 36px;
    height: 36px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px 20px;
    background: var(--bg, #fff);
    border-bottom: 1px solid var(--border, #eee);
  }

  .main-nav.active {
    display: flex;
  }

  .main-nav a {
    padding: 14px 0;
  }

  .lang-text {
    display: none;
  }

  .lang-toggle,
  .theme-toggle {
    width: 40px;
    padding: 0;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

html {
  scroll-behavior: smooth;
  font-size: 15px;
}

body {
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.65;
  transition: background 0.45s ease, color 0.45s ease;
  overflow-x: hidden;
}

body.loading,
body.menu-open {
  overflow: hidden;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

.container {
  width: min(1400px, calc(100% - 64px));
  margin: 0 auto;
}

/* Loader */
.page-loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  gap: 16px;
  background: var(--bg);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--accent-soft);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-text {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
}

/* Background */
.live-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background: var(--bg);
  pointer-events: none;
}

.live-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 35%, var(--bg) 85%);
  opacity: 0.75;
}

.bg-gradient {
  position: absolute;
  width: 45vw;
  height: 45vw;
  min-width: 260px;
  min-height: 260px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.14;
  animation: float 20s ease-in-out infinite alternate;
  will-change: transform;
}

.bg-gradient-1 {
  top: -8%;
  left: -4%;
  background: #00b7aa;
}

.bg-gradient-2 {
  top: 25%;
  right: -8%;
  background: #2868de;
  animation-delay: -6s;
}

.bg-gradient-3 {
  bottom: -12%;
  left: 18%;
  background: #9839c5;
  animation-delay: -11s;
}

.bg-particles span {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.22;
  animation: particle linear infinite;
  will-change: transform, opacity;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: var(--header);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 18px;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  transition: opacity var(--transition);
}

.logo:hover {
  opacity: 0.85;
}

.logo-icon {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--accent-soft);
  font-size: 1rem;
}

.accent {
  color: var(--accent);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.main-nav a {
  position: relative;
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
  padding: 6px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 10px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

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

.main-nav a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.theme-toggle,
.lang-toggle,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  background: var(--surface-soft);
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.theme-toggle:hover,
.lang-toggle:hover,
.nav-toggle:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.lang-text {
  font-size: 0.68rem;
  font-weight: 800;
}

html[data-theme='dark'] .theme-icon-light,
html[data-theme='light'] .theme-icon-dark {
  display: none;
}

.nav-toggle {
  display: none;
  padding: 7px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  border-radius: 10px;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle.active span:first-child {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle.active span:last-child {
  transform: translateY(-5px) rotate(-45deg);
}

/* Hero */
.hero {
  padding: 88px 0 72px;
}

.hero-inner {
  text-align: center;
}

.hero h1 {
  max-width: 820px;
  margin: 0 auto 16px;
  font-size: clamp(2rem, 6vw, 3.8rem);
  line-height: 1.08;
  letter-spacing: -0.06em;
  background: linear-gradient(110deg, var(--text), var(--accent), #93e8e0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: hero-in 0.75s ease both;
}

.subtitle {
  max-width: 540px;
  margin: 0 auto 36px;
  color: var(--muted);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  animation: hero-in 0.75s 0.08s ease both;
}

/* Upload Card */
.upload-card {
  margin: 0 auto;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  animation: hero-in 0.75s 0.16s ease both;
}

.upload-dropzone {
  padding: 42px 24px 32px;
  border: 1.5px dashed rgba(28, 200, 179, 0.38);
  border-radius: 12px;
  background: linear-gradient(145deg, var(--accent-soft), transparent 55%);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--accent);
  background: linear-gradient(145deg, rgba(28, 200, 179, 0.18), transparent 65%);
  transform: scale(1.006);
}

.dz-icon {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  margin: 0 auto 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
  font-size: 1.75rem;
}

.upload-dropzone h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
  font-weight: 700;
}

.upload-dropzone p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.btn {
  border-radius: 9px;
  font-weight: 700;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

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

.btn-primary {
  margin: 20px 0 8px;
  padding: 12px 22px;
  color: #031a18;
  background: linear-gradient(135deg, #2de1c7, #0aa99c);
  box-shadow: 0 10px 24px rgba(15, 205, 182, 0.24);
  font-size: 0.9rem;
}

.btn-primary:hover {
  box-shadow: 0 14px 32px rgba(15, 205, 182, 0.34);
}

.dz-hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 8px;
}

.dz-formats {
  max-width: 460px;
  margin: 14px auto 0 !important;
  font-size: 0.72rem;
  opacity: 0.9;
  color: var(--muted);
}

.dz-samples {
  margin: 14px 0 4px;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}

.sample-btn {
  color: var(--accent);
  text-decoration: underline;
  font-size: 0.8rem;
  margin: 0 5px;
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--transition);
}

.sample-btn:hover {
  opacity: 0.8;
}

/* Progress & Result */
.upload-progress {
  padding: 32px 24px;
}

.progress-bar {
  height: 8px;
  overflow: hidden;
  border-radius: 30px;
  background: var(--surface-soft);
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-strong), #7cf4e7);
  transition: width 0.2s ease;
}

.upload-progress p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  text-align: center;
}

.upload-result {
  padding: 20px;
}

.upload-result img {
  display: block;
  width: min(260px, 100%);
  max-height: 200px;
  margin: 0 auto 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  object-fit: contain;
  background: var(--surface-soft);
}

.result-link-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.result-link-row input {
  min-width: 0;
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  background: var(--surface-soft);
  outline: none;
  transition: border-color var(--transition);
  font-size: 0.86rem;
}

.result-link-row input:focus {
  border-color: var(--accent);
}

.btn-small {
  padding: 9px 12px;
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  white-space: nowrap;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.82rem;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.btn-small:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.btn-ghost {
  margin-top: 16px;
  padding: 10px 16px;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-weight: 600;
  background: var(--surface-soft);
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
  font-size: 0.84rem;
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.upload-error {
  margin: 12px 8px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 122, 120, 0.28);
  border-radius: 8px;
  color: var(--danger);
  background: rgba(255, 122, 120, 0.06);
  font-size: 0.82rem;
  text-align: center;
}

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

section h2 {
  margin: 0 0 10px;
  text-align: center;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  letter-spacing: -0.05em;
  font-weight: 800;
}

.section-sub {
  margin: 0 auto 32px;
  color: var(--muted);
  text-align: center;
  max-width: 580px;
  font-size: 0.92rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 32px;
}

.step {
  padding: 24px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.step:hover {
  transform: translateY(-5px);
  border-color: rgba(28, 200, 179, 0.38);
}

.step-num {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin: 0 auto 14px;
  border-radius: 50%;
  color: #021a17;
  background: var(--accent);
  font-weight: 800;
  font-size: 0.95rem;
}

.step h3,
.card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
}

.step p,
.card p,
.usecase span {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.how-note {
  max-width: 640px;
  margin: 28px auto 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.84rem;
}

.cards-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

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

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

.card {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(12px);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.card:hover {
  border-color: rgba(28, 200, 179, 0.42);
  background: var(--surface-strong);
  transform: translateY(-6px);
}

.card-icon {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--accent-soft);
  font-size: 1.1rem;
}

.feature-highlights {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface-soft);
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.usecase {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--surface);
  transition: transform var(--transition), background var(--transition);
}

.usecase:hover {
  transform: translateX(4px);
  background: var(--surface-strong);
}

.usecase strong {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

/* FAQ */
.faq-list {
  max-width: 740px;
  margin: 32px auto 0;
}

.faq-item {
  margin-bottom: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(28, 200, 179, 0.28);
}

.faq-q {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  color: var(--text);
  text-align: left;
  font-weight: 700;
  font-size: 0.92rem;
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition);
}

.faq-q:hover {
  background: var(--surface-soft);
}

.faq-toggle {
  color: var(--accent);
  font-size: 1.25rem;
  transition: transform 0.3s ease;
  line-height: 1;
}

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
}

.faq-a p {
  overflow: hidden;
  margin: 0;
  padding: 0 18px;
  color: var(--muted);
  font-size: 0.86rem;
}

.faq-item.open .faq-a {
  grid-template-rows: 1fr;
}

.faq-item.open .faq-a p {
  padding-bottom: 16px;
}

.faq-item.open .faq-toggle {
  transform: rotate(45deg);
}

/* Footer */
.site-footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
  background: var(--surface-soft);
}

.footer-inner {
  color: var(--muted);
  text-align: center;
  font-size: 0.76rem;
}

/* Language Menu */
.language-menu {
  position: fixed;
  top: 72px;
  right: max(16px, calc((100vw - 1400px) / 2));
  z-index: 100;
  width: min(840px, calc(100vw - 24px));
  max-height: min(640px, calc(100vh - 100px));
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
}

.language-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.language-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.language-menu-head button {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  background: var(--surface-soft);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.language-menu-head button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 7px;
}

.language-option {
  display: flex;
  min-height: 82px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 4px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--text);
  font-size: 0.7rem;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.language-option:hover,
.language-option.active {
  border-color: var(--border);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.language-flag {
  font-size: 1.6rem;
  line-height: 1;
}

/* Popup / Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  width: min(440px, calc(100% - 48px));
  max-width: 440px;
  padding: 24px 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  transform: translateY(14px) scale(0.98);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.35s ease;
}

.modal-overlay.show .modal {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.modal-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.modal-close {
  width: 30px;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-soft);
  color: var(--text);
  font-size: 1.15rem;
  line-height: 1;
  display: grid;
  place-items: center;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.modal-close:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.modal-body {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.modal-body .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(8px);
  animation: word-pop 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes word-pop {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-footer {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.modal-btn {
  padding: 9px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.82rem;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.modal-btn-primary {
  color: #031a18;
  background: linear-gradient(135deg, #2de1c7, #0aa99c);
  box-shadow: 0 10px 22px rgba(15, 205, 182, 0.24);
}

.modal-btn-primary:hover {
  box-shadow: 0 14px 30px rgba(15, 205, 182, 0.34);
  transform: translateY(-2px);
}

.modal-btn-ghost {
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.modal-btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

[hidden] {
  display: none !important;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes float {
  from {
    transform: translate3d(-3%, -2%, 0) scale(1);
  }
  to {
    transform: translate3d(6%, 4%, 0) scale(1.1);
  }
}

@keyframes particle {
  0% {
    opacity: 0;
    transform: translateY(18px) scale(0.7);
  }
  20%,
  80% {
    opacity: 0.32;
  }
  100% {
    opacity: 0;
    transform: translateY(-100px) scale(1.3);
  }
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 900px) {
  .language-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .cards-grid.six {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .container {
    width: min(100% - 40px, 560px);
  }

  .header-inner {
    min-height: 58px;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 12px;
    left: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 11px;
    background: var(--surface-strong);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
  }

  .main-nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .main-nav a {
    padding: 11px 14px;
    border-radius: 8px;
  }

  .main-nav a:hover {
    background: var(--accent-soft);
  }

  .main-nav a::after {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 64px 0 52px;
  }

  .upload-dropzone {
    padding: 36px 18px 26px;
  }

  .result-link-row input {
    flex-basis: 100%;
  }

  .steps,
  .cards-grid.three,
  .usecase-grid {
    grid-template-columns: 1fr;
  }

  .cards-grid.six {
    grid-template-columns: repeat(2, 1fr);
  }

  section {
    padding: 56px 0;
  }

  .language-menu {
    top: 66px;
    right: 12px;
    left: 12px;
    width: auto;
  }

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

@media (max-width: 420px) {
  .logo-text {
    display: none;
  }

  .language-grid,
  .cards-grid.six {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn-primary {
    width: 100%;
  }

  .hero h1 {
    font-size: clamp(1.7rem, 7vw, 2.6rem);
  }

  .upload-card {
    border-radius: 12px;
  }

  .step,
  .card,
  .usecase {
    padding: 18px 14px;
  }

  .dz-icon {
    width: 54px;
    height: 54px;
    font-size: 1.6rem;
  }

  .upload-dropzone h3 {
    font-size: 1.05rem;
  }

  .step-num {
    width: 34px;
    height: 34px;
    font-size: 0.9rem;
  }

  .modal {
    padding: 20px 18px;
  }

  .modal-title {
    font-size: 0.95rem;
  }

  .modal-body {
    font-size: 0.84rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}