/* =====================================================
 * KingSeedance Download Page v3
 * Layout: Hero + Verify Form + Versions Table + FAQ
 * ===================================================== */

:root {
  --ks-bg: #07050f;
  --ks-bg-2: #0d0820;
  --ks-surface: rgba(255, 255, 255, 0.04);
  --ks-surface-2: rgba(255, 255, 255, 0.07);
  --ks-border: rgba(255, 255, 255, 0.08);
  --ks-border-strong: rgba(139, 92, 246, 0.3);
  --ks-text: #f4f4f5;
  --ks-text-dim: #a1a1aa;
  --ks-text-mute: #71717a;
  --ks-accent: #a78bfa;
  --ks-accent-2: #f472b6;
  --ks-success: #34d399;
  --ks-error: #f87171;
  --ks-radius: 14px;
  --ks-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --ks-container: 1200px;
}

.ks-container { width: 100%; max-width: var(--ks-container); margin: 0 auto; padding: 0 24px; }
.ks-section { padding: 64px 0; }

/* === Hero === */
.ks-dl-hero {
  padding: 110px 0 60px;
  text-align: center;
  background:
    radial-gradient(900px 500px at 80% 0%, rgba(139, 92, 246, 0.22), transparent 70%),
    radial-gradient(700px 400px at 0% 100%, rgba(244, 114, 182, 0.15), transparent 70%),
    var(--ks-bg);
}
.ks-version-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--ks-surface-2);
  border: 1px solid var(--ks-border);
  font-size: 13px;
  font-weight: 600;
  color: var(--ks-accent);
  margin-bottom: 18px;
}
.ks-version-pill::before { content: '⚡'; }
.ks-dl-hero h1 {
  font-size: clamp(36px, 5.5vw, 60px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.ks-dl-hero h1 .ks-grad {
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ks-dl-hero p { font-size: 17px; color: var(--ks-text-dim); line-height: 1.6; max-width: 640px; margin: 0 auto; }

/* === Verify Form === */
.ks-verify {
  padding: 40px 0 60px;
}
.ks-verify-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--ks-surface);
  border: 1px solid var(--ks-border-strong);
  border-radius: 18px;
  padding: 36px;
  box-shadow: var(--ks-shadow);
  position: relative;
  overflow: hidden;
}
.ks-verify-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ks-accent), var(--ks-accent-2));
}
.ks-verify-card h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
}
.ks-verify-card p.ks-verify-help {
  color: var(--ks-text-dim);
  font-size: 14px;
  margin-bottom: 22px;
}
.ks-form-row { margin-bottom: 16px; }
.ks-form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ks-text);
  margin-bottom: 6px;
}
.ks-form-row label .req { color: var(--ks-error); }
.ks-form-row select,
.ks-form-row input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--ks-border);
  color: var(--ks-text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 200ms ease;
}
.ks-form-row input:focus,
.ks-form-row select:focus {
  outline: none;
  border-color: var(--ks-accent);
}
.ks-form-row .ks-key-input {
  font-family: ui-monospace, 'SF Mono', monospace;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ks-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 200ms ease;
  font-family: inherit;
}
.ks-btn--primary {
  background: linear-gradient(135deg, var(--ks-accent) 0%, var(--ks-accent-2) 100%);
  color: #fff;
  box-shadow: 0 8px 24px rgba(139, 92, 246, 0.35);
}
.ks-btn--primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.ks-btn--primary:disabled { opacity: 0.6; cursor: not-allowed; }
.ks-btn--ghost {
  background: var(--ks-surface);
  color: var(--ks-text);
  border-color: var(--ks-border);
}
.ks-btn--ghost:hover { background: var(--ks-surface-2); }

.ks-alert {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.5;
  display: none;
}
.ks-alert.show { display: block; }
.ks-alert.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}
.ks-alert.success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #86efac;
}

/* === Download Result === */
.ks-dl-result {
  margin-top: 28px;
  display: none;
}
.ks-dl-result.show { display: block; animation: ks-fade-in 300ms ease; }
@keyframes ks-fade-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.ks-dl-result-info {
  padding: 18px 20px;
  border-radius: 12px;
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.25);
  margin-bottom: 18px;
}
.ks-dl-result-info dl {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 6px 14px;
  margin: 0;
  font-size: 13px;
}
.ks-dl-result-info dt { color: var(--ks-text-mute); font-weight: 600; }
.ks-dl-result-info dd { margin: 0; color: var(--ks-text); font-weight: 500; }

.ks-download-list { display: flex; flex-direction: column; gap: 12px; }
.ks-download-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
  border-radius: 12px;
  transition: all 200ms ease;
}
.ks-download-row:hover {
  border-color: var(--ks-border-strong);
  background: var(--ks-surface-2);
}
.ks-download-row .ks-dl-icon {
  flex-shrink: 0;
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(244, 114, 182, 0.18));
  color: var(--ks-accent);
}
.ks-download-row .ks-dl-info { flex: 1; min-width: 0; }
.ks-download-row .ks-dl-name { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.ks-download-row .ks-dl-meta {
  display: flex; gap: 12px; flex-wrap: wrap;
  font-size: 12px; color: var(--ks-text-mute);
}
.ks-download-row .ks-dl-action {
  flex-shrink: 0;
  padding: 10px 18px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  color: white;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: filter 200ms ease;
}
.ks-download-row .ks-dl-action:hover { filter: brightness(1.1); }
.ks-download-row .ks-dl-action.disabled {
  background: var(--ks-surface-2);
  color: var(--ks-text-mute);
  pointer-events: none;
}

/* === Versions table === */
.ks-section-title {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 6px;
}
.ks-section-sub { color: var(--ks-text-dim); font-size: 14px; margin-bottom: 24px; }

.ks-versions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
  border-radius: 12px;
  overflow: hidden;
}
.ks-versions-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ks-text-mute);
  background: rgba(0,0,0,0.2);
  border-bottom: 1px solid var(--ks-border);
}
.ks-versions-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--ks-border);
  vertical-align: top;
}
.ks-versions-table tr:last-child td { border-bottom: none; }
.ks-versions-table .ks-version-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.18);
  color: var(--ks-accent);
  font-size: 12px;
  font-weight: 700;
}
.ks-versions-table .ks-filename {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  color: var(--ks-text-dim);
}
.ks-versions-table .ks-size { color: var(--ks-text-mute); font-size: 13px; }
.ks-versions-table .ks-sha {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: var(--ks-text-mute);
  word-break: break-all;
  max-width: 220px;
}
.ks-versions-table .ks-notes {
  color: var(--ks-text-dim);
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  max-width: 320px;
}
.ks-versions-table a.ks-dl-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(139, 92, 246, 0.2);
  color: var(--ks-accent);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  transition: background 200ms ease;
}
.ks-versions-table a.ks-dl-link:hover { background: rgba(139, 92, 246, 0.35); }

/* === Locked state cho versions table === */
.ks-versions-table tr.ks-locked td {
  color: var(--ks-text-mute);
}
.ks-versions-table tr.ks-locked .ks-sha-mask {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ks-text-mute);
  filter: blur(2px);
  user-select: none;
}
.ks-lock-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(244, 114, 182, 0.12);
  border: 1px solid rgba(244, 114, 182, 0.25);
  color: #f9a8d4;
  font-size: 11px;
  font-weight: 600;
}
.ks-lock-badge::before { content: '🔒'; }
.ks-unlock-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--ks-border);
  color: var(--ks-text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
  transition: all 200ms ease;
}
.ks-unlock-cta:hover {
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  color: white;
  border-color: transparent;
}

/* Locked notice trên đầu bảng */
.ks-lock-notice {
  padding: 14px 18px;
  margin-bottom: 16px;
  border-radius: 12px;
  background: rgba(244, 114, 182, 0.06);
  border: 1px solid rgba(244, 114, 182, 0.2);
  font-size: 13px;
  line-height: 1.5;
  color: #fbcfe8;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.ks-lock-notice .ks-lock-notice-icon {
  flex-shrink: 0;
  width: 20px; height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
}
.ks-lock-notice a {
  color: #f9a8d4;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.ks-versions-table tr.ks-unlocked {
  animation: ks-row-unlock 500ms ease;
}
@keyframes ks-row-unlock {
  0% { background: rgba(244, 114, 182, 0.08); }
  100% { background: transparent; }
}

/* === Requirements === */
.ks-req-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.ks-req-card {
  padding: 24px;
  border-radius: 14px;
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
}
.ks-req-card h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 700;
  margin: 0 0 14px;
}
.ks-req-card h3 .ks-tag {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(139, 92, 246, 0.2);
  color: var(--ks-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.ks-req-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ks-req-card li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: var(--ks-text-dim);
  align-items: flex-start;
}
.ks-req-card li strong { color: var(--ks-text); }
.ks-req-card li::before {
  content: '✓';
  flex-shrink: 0;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: rgba(52, 211, 153, 0.15);
  color: var(--ks-success);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

/* === Steps === */
.ks-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.ks-step {
  padding: 20px;
  background: var(--ks-surface);
  border: 1px solid var(--ks-border);
  border-radius: 12px;
  position: relative;
}
.ks-step-num {
  position: absolute;
  top: -14px; left: 20px;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2));
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 13px;
}
.ks-step h3 { font-size: 15px; font-weight: 700; margin: 12px 0 6px; }
.ks-step p { font-size: 13px; color: var(--ks-text-dim); line-height: 1.5; margin: 0; }

/* === FAQ === */
.ks-faq { max-width: 760px; margin: 0 auto; }
.ks-faq-item {
  border: 1px solid var(--ks-border);
  border-radius: 12px;
  margin-bottom: 10px;
  background: var(--ks-surface);
  overflow: hidden;
}
.ks-faq-item.open { border-color: var(--ks-border-strong); }
.ks-faq-q {
  width: 100%;
  padding: 16px 20px;
  background: transparent;
  border: none;
  color: var(--ks-text);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
}
.ks-faq-q .ks-faq-icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--ks-surface-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  transition: all 200ms ease;
}
.ks-faq-item.open .ks-faq-icon { background: linear-gradient(135deg, var(--ks-accent), var(--ks-accent-2)); transform: rotate(45deg); }
.ks-faq-a { max-height: 0; overflow: hidden; transition: max-height 300ms ease; }
.ks-faq-item.open .ks-faq-a { max-height: 320px; }
.ks-faq-a p { padding: 0 20px 16px; color: var(--ks-text-dim); font-size: 14px; line-height: 1.65; margin: 0; }

/* === Responsive === */
@media (max-width: 900px) {
  .ks-req-grid { grid-template-columns: 1fr; }
  .ks-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .ks-section { padding: 48px 0; }
  .ks-verify-card { padding: 24px; }
  .ks-steps { grid-template-columns: 1fr; }
  .ks-download-row { flex-wrap: wrap; }
  .ks-download-row .ks-dl-action { width: 100%; text-align: center; justify-content: center; }
  .ks-versions-table { font-size: 12px; }
  .ks-versions-table th, .ks-versions-table td { padding: 10px; }
}