.hero {
  position: relative;
  overflow: hidden;
  padding-top: 64px;
  padding-bottom: 90px;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0,1.02fr) minmax(0,0.98fr);
  gap: 40px;
  align-items: center;
}
.hero-copy { padding-top: 12px; }
.hero-copy .tu-eyebrow { margin-bottom: 22px; }
.hero-copy .tu-h1 { margin-bottom: 22px; }
.hero-copy .tu-lede { max-width: 480px; margin-bottom: 32px; }

.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }

.hero-proof { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.hero-proof-stack { display: flex; }
.hero-proof-stack span {
  width: 36px; height: 36px; border-radius: 50%;
  border: 2px solid var(--bg-void);
  margin-left: -6px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 600; font-size: 0.58rem; color: #fff;
  position: relative;
}
.hero-proof-stack span:nth-child(1) { z-index: 3; }
.hero-proof-stack span:nth-child(2) { z-index: 2; }
.hero-proof-stack span:nth-child(3) { z-index: 1; }
.hero-proof-stack span:first-child { margin-left: 0; }
.hero-proof-text { font-size: 0.82rem; color: var(--text-tertiary); }
.hero-proof-text strong { color: var(--text-primary); }

.hero-stage {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed var(--border-default);
}
.hero-orbit-ring.r1 { width: 68%; height: 68%; }
.hero-orbit-ring.r2 { width: 96%; height: 96%; border-color: var(--border-subtle); }

.hero-orbit-spin {
  position: absolute;
  inset: 0;
  animation: tu-spin 90s linear infinite;
}
.orbit-item {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform: rotate(var(--angle)) translateX(var(--radius));
}
.orbit-chip {
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 52px;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.62rem;
  color: #fff;
  box-shadow: var(--shadow-md);
  animation: tu-orbit-counter 90s linear infinite;
}
@keyframes tu-orbit-counter {
  from { transform: translate(-50%,-50%) rotate(calc(-1 * var(--angle))); }
  to { transform: translate(-50%,-50%) rotate(calc(-1 * var(--angle) - 360deg)); }
}
@media (max-width: 640px) { .orbit-chip { width: 42px; height: 42px; border-radius: 12px; font-size: 0.52rem; } }

.hero-dropzone {
  position: relative;
  z-index: 2;
  width: 78%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-default);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 14px;
  padding: 30px;
  cursor: pointer;
  transition: border-color var(--dur-base), transform var(--dur-base), box-shadow var(--dur-base);
}
.hero-dropzone::before {
  content: '';
  position: absolute;
  inset: -1.5px;
  border-radius: 50%;
  padding: 1.5px;
  background: var(--gradient-brand);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base);
}
.hero-dropzone:hover, .hero-dropzone.is-dragover { transform: scale(1.02); }
.hero-dropzone:hover::before, .hero-dropzone.is-dragover::before { opacity: 1; }
.hero-dropzone-icon {
  width: 60px; height: 60px; border-radius: 50%;
  background: var(--gradient-brand-vivid);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-glow-brand);
  animation: tu-float 4s ease-in-out infinite;
}
.hero-dropzone-icon svg { width: 26px; height: 26px; color: #fff; }
.hero-dropzone-title { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--text-primary); }
.hero-dropzone-sub { font-size: 0.78rem; color: var(--text-tertiary); max-width: 220px; line-height: 1.5; }
.hero-dropzone.has-file { display: none; }

.hero-file-result {
  position: relative;
  z-index: 2;
  width: 92%;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-xl);
  padding: 20px;
  animation: tu-modal-in var(--dur-base) var(--ease-spring);
}
.hero-file-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; padding-bottom: 14px; border-bottom: 1px solid var(--border-subtle); }
.hero-file-head > div { display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.hero-file-head strong { font-family: var(--font-display); font-size: 0.9rem; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hero-file-head span { font-size: 0.74rem; color: var(--text-tertiary); }
.hero-file-head .btn-icon { margin-left: auto; }
.hero-file-suggestions { display: flex; flex-direction: column; gap: 6px; max-height: 260px; overflow-y: auto; }
.hero-file-suggestion {
  display: flex; align-items: center; gap: 12px;
  padding: 10px; border-radius: var(--r-md);
  font-family: var(--font-display); font-weight: 600; font-size: 0.86rem; color: var(--text-primary);
}
.hero-file-suggestion:hover { background: var(--bg-surface-2); }

@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { text-align: center; }
  .hero-copy .tu-lede { margin-inline: auto; }
  .hero-chips, .hero-proof { justify-content: center; }
  .hero-stage { max-width: 380px; }
}
@media (max-width: 640px) {
  .hero { padding-top: 36px; padding-bottom: 56px; }
  .hero-stage { max-width: 300px; }
  .hero-dropzone { padding: 20px; gap: 10px; }
  .hero-dropzone-title { font-size: 0.92rem; }
}

.stats-strip {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}
.stats-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-block: 40px;
}
.stat-block { text-align: center; padding-inline: 12px; position: relative; }
.stat-block + .stat-block::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 1px; height: 34px; background: var(--border-subtle);
}
.stat-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.5rem, 2.4vw, 2rem); color: var(--text-primary); }
.stat-num span { background: var(--gradient-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { font-size: 0.78rem; color: var(--text-tertiary); margin-top: 4px; }
@media (max-width: 640px) { .stats-strip-inner { grid-template-columns: 1fr 1fr; row-gap: 24px; } .stat-block:nth-child(3)::before { display: none; } }

.task-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.task-card {
  padding: 26px;
  display: flex; flex-direction: column; gap: 14px;
}
.task-card-icon {
  width: 46px; height: 46px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-surface-2); border: 1px solid var(--border-default);
  color: var(--blue-300);
}
.task-card-icon svg { width: 22px; height: 22px; }
.task-card h3 { font-family: var(--font-display); font-size: 1.02rem; font-weight: 600; }
.task-card p { font-size: 0.84rem; line-height: 1.6; }
.task-card-link { margin-top: auto; display: flex; align-items: center; gap: 6px; font-family: var(--font-display); font-weight: 600; font-size: 0.82rem; color: var(--blue-300); }
.task-card-link svg { width: 15px; height: 15px; transition: transform var(--dur-fast); }
.task-card:hover .task-card-link svg { transform: translateX(3px); }
@media (max-width: 900px) { .task-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .task-grid { grid-template-columns: 1fr; } }

.cat-rail { display: grid; grid-template-columns: repeat(7, 1fr); gap: 14px; }
.cat-tile {
  padding: 22px 18px;
  display: flex; flex-direction: column; gap: 14px;
  text-align: left;
}
.cat-tile-icon { width: 42px; height: 42px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-weight: 600; font-size: 0.62rem; color: #fff; }
.cat-tile-name { font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; }
.cat-tile-desc { font-size: 0.75rem; color: var(--text-tertiary); line-height: 1.5; }
.cat-tile-count { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-tertiary); margin-top: auto; }
@media (max-width: 1100px) { .cat-rail { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 640px) { .cat-rail { grid-template-columns: repeat(2, 1fr); } }

.tools-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; flex-wrap: wrap; }
.tools-filters { display: flex; gap: 8px; flex-wrap: wrap; }
.tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 1024px) { .tool-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px) { .tool-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }
@media (max-width: 420px) { .tool-grid { grid-template-columns: 1fr 1fr; } .tool-tile { padding: 14px; } .tool-tile-icon { width: 36px; height: 36px; border-radius: 10px; } }

.split-band { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.split-card {
  position: relative;
  padding: 40px;
  overflow: hidden;
  min-height: 320px;
  display: flex; flex-direction: column;
}
.split-card.mode-student { background: linear-gradient(150deg, rgba(62,107,255,0.16), var(--bg-surface) 60%); }
.split-card.mode-work { background: linear-gradient(150deg, rgba(139,77,255,0.16), var(--bg-surface) 60%); }
.split-card .badge { align-self: flex-start; margin-bottom: 18px; }
.split-card h3 { font-family: var(--font-display); font-size: 1.5rem; margin-bottom: 12px; }
.split-card p { font-size: 0.88rem; max-width: 380px; margin-bottom: 22px; }
.split-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 26px; }
.split-list li { display: flex; align-items: center; gap: 10px; font-size: 0.86rem; color: var(--text-secondary); }
.split-list svg { width: 17px; height: 17px; color: var(--success); flex-shrink: 0; }
.split-card .btn { align-self: flex-start; margin-top: auto; }
@media (max-width: 860px) { .split-band { grid-template-columns: 1fr; } .split-card { padding: 30px; min-height: auto; } }

.feature-band { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.feature-band.reverse .feature-visual { order: 2; }
.feature-visual {
  aspect-ratio: 4/3;
  border-radius: var(--r-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  position: relative;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.feature-visual-glow { position: absolute; width: 60%; height: 60%; border-radius: 50%; filter: blur(70px); opacity: 0.4; }
.feature-list { display: flex; flex-direction: column; gap: 16px; margin: 26px 0 28px; }
.feature-list li { display: flex; gap: 14px; align-items: flex-start; }
.feature-list .num {
  width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0;
  background: var(--bg-surface-2); border: 1px solid var(--border-default);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--blue-300); font-weight: 600;
}
.feature-list div strong { display: block; font-family: var(--font-display); font-size: 0.9rem; margin-bottom: 2px; }
.feature-list div span { font-size: 0.82rem; color: var(--text-tertiary); }
@media (max-width: 900px) { .feature-band, .feature-band.reverse .feature-visual { grid-template-columns: 1fr; order: initial; } .feature-band { grid-template-columns: 1fr; } }

.chat-mock { width: 82%; display: flex; flex-direction: column; gap: 10px; }
.chat-bubble { padding: 12px 16px; border-radius: 14px; font-size: 0.82rem; max-width: 85%; }
.chat-bubble.user { align-self: flex-end; background: var(--gradient-brand); color: #fff; border-bottom-right-radius: 4px; }
.chat-bubble.ai { align-self: flex-start; background: var(--bg-surface-2); border: 1px solid var(--border-default); border-bottom-left-radius: 4px; color: var(--text-secondary); }

.scan-mock { width: 70%; aspect-ratio: 3/4; background: var(--bg-surface-2); border: 1px solid var(--border-default); border-radius: var(--r-md); position: relative; overflow: hidden; }
.scan-mock::before { content: ''; position: absolute; inset: 10%; border: 2px dashed rgba(110,147,255,0.5); border-radius: 8px; }
.scan-line { position: absolute; left: 8%; right: 8%; height: 2px; background: var(--gradient-brand-vivid); box-shadow: 0 0 14px rgba(110,147,255,0.8); animation: tu-scan 2.6s ease-in-out infinite; }
@keyframes tu-scan { 0%,100% { top: 12%; } 50% { top: 84%; } }

.flow-strip { display: flex; align-items: center; gap: 0; overflow-x: auto; padding: 8px 4px 20px; }
.flow-step { display: flex; flex-direction: column; align-items: center; gap: 10px; flex-shrink: 0; width: 140px; text-align: center; }
.flow-step-icon { width: 52px; height: 52px; border-radius: 15px; background: var(--bg-surface); border: 1px solid var(--border-default); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-weight: 700; color: var(--blue-300); }
.flow-step span { font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); font-family: var(--font-display); }
.flow-arrow { flex-shrink: 0; width: 46px; color: var(--border-strong); margin-bottom: 30px; }

.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.trust-card { padding: 28px; }
.trust-card-icon { width: 42px; height: 42px; border-radius: 12px; background: var(--success-bg); color: var(--success); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.trust-card-icon svg { width: 20px; height: 20px; }
.trust-card h4 { font-family: var(--font-display); font-size: 0.96rem; margin-bottom: 8px; }
.trust-card p { font-size: 0.84rem; line-height: 1.6; }
@media (max-width: 860px) { .trust-grid { grid-template-columns: 1fr; } }

.pwa-banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-2xl);
  background: var(--gradient-brand-deep);
  padding: 52px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 30px;
}
.pwa-banner-glow { position: absolute; width: 340px; height: 340px; border-radius: 50%; background: rgba(255,255,255,0.14); filter: blur(70px); top: -100px; right: -60px; }
.pwa-banner h2 { color: #fff; font-family: var(--font-display); font-size: clamp(1.5rem,2vw,2.1rem); margin-bottom: 10px; }
.pwa-banner p { color: rgba(255,255,255,0.82); max-width: 460px; font-size: 0.92rem; }
.pwa-banner-actions { display: flex; gap: 12px; position: relative; z-index: 1; }
.pwa-banner .btn-white { color: var(--blue-600); }
@media (max-width: 760px) { .pwa-banner { grid-template-columns: 1fr; text-align: center; padding: 36px 26px; } .pwa-banner p { margin-inline: auto; } .pwa-banner-actions { justify-content: center; flex-wrap: wrap; } }

.final-cta { text-align: center; }
.final-cta .tu-h2 { max-width: 620px; margin-inline: auto 18px; }
.final-cta-actions { display: flex; gap: 14px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }

@media (max-width: 640px) {
  .tu-section-head { margin-bottom: 32px; }
}