:root {
  --bg: #08111f;
  --surface: #0d1829;
  --surface-2: #111f34;
  --line: #22324a;
  --text: #f3f7ff;
  --muted: #93a4bc;
  --accent: #7c8cff;
  --accent-2: #5be0b3;
  --danger: #ff6f7d;
  --warn: #ffc65b;
  --good: #62df9d;
  --shadow: 0 24px 70px rgba(0,0,0,.28);
  --radius: 20px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% -5%, rgba(124,140,255,.16), transparent 28rem),
    radial-gradient(circle at 90% 5%, rgba(91,224,179,.09), transparent 24rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .7; }

.login-body { display: grid; place-items: center; padding: 24px; }
.login-shell { width: min(100%, 480px); }
.login-card {
  background: linear-gradient(180deg, rgba(17,31,52,.95), rgba(10,21,37,.96));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 40px;
  box-shadow: var(--shadow);
}
.brand-mark {
  width: 54px; height: 54px; display: grid; place-items: center;
  border-radius: 16px; font-weight: 900; letter-spacing: -.04em;
  background: linear-gradient(135deg, var(--accent), #a96cff);
  box-shadow: 0 14px 32px rgba(124,140,255,.24);
}
.brand-mark.mini { width: 38px; height: 38px; border-radius: 12px; font-size: 13px; }
.eyebrow { margin: 0 0 7px; font-size: 11px; letter-spacing: .15em; font-weight: 800; color: #9fb1cb; }
h1,h2,h3,p { margin-top: 0; }
h1 { font-size: clamp(30px, 4vw, 52px); line-height: 1.05; letter-spacing: -.045em; }
h2 { font-size: clamp(22px, 3vw, 30px); line-height: 1.15; letter-spacing: -.025em; }
h3 { line-height: 1.25; }
.login-card h1 { font-size: 34px; margin: 18px 0 10px; }
.muted { color: var(--muted); }
.tiny { font-size: 12px; }
.lead { max-width: 780px; font-size: 17px; color: #acbbcf; }

.stack-form { display: grid; gap: 12px; margin-top: 30px; }
.stack-form label, .field label { font-size: 13px; font-weight: 750; color: #c8d3e4; }
.password-row { display: flex; gap: 8px; }
.password-row input { flex: 1; }
input[type="text"], input[type="url"], input[type="password"] {
  width: 100%; min-height: 48px; padding: 0 14px;
  color: var(--text); background: #091321; border: 1px solid #2a3a52; border-radius: 12px;
  outline: none; transition: .2s border-color, .2s box-shadow;
}
input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(124,140,255,.12); }
.primary-btn, .secondary-btn, .ghost-btn {
  display: inline-flex; justify-content: center; align-items: center; gap: 8px;
  min-height: 44px; padding: 0 17px; border-radius: 12px; font-weight: 800; border: 1px solid transparent;
}
.primary-btn { background: linear-gradient(135deg, var(--accent), #9a70ff); color: white; box-shadow: 0 12px 28px rgba(124,140,255,.18); }
.secondary-btn { background: #111e31; color: #d9e3f2; border-color: #2b3a51; }
.secondary-btn.small { padding: 0 12px; min-height: 48px; }
.ghost-btn { color: #adbbcf; background: transparent; border-color: #25334a; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 14px max(20px, calc((100vw - 1180px) / 2));
  background: rgba(8,17,31,.85); backdrop-filter: blur(18px); border-bottom: 1px solid rgba(45,61,84,.6);
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 850; }
.top-actions { display: flex; gap: 8px; }
.page-shell { width: min(1180px, calc(100% - 36px)); margin: 0 auto; padding: 54px 0 70px; }
.hero { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; margin-bottom: 28px; }
.hero h1 { max-width: 820px; margin-bottom: 14px; }
.api-chip { white-space: nowrap; display: flex; align-items: center; gap: 8px; padding: 10px 13px; border: 1px solid var(--line); border-radius: 999px; color: #cbd6e6; background: #0e1a2b; font-size: 12px; font-weight: 750; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--warn); }
.api-chip.ok .dot { background: var(--good); box-shadow: 0 0 0 5px rgba(98,223,157,.08); }

.alert { margin: 14px 0; padding: 13px 16px; border-radius: 13px; border: 1px solid; font-size: 14px; }
.alert-error { color: #ffd7dc; background: rgba(255,111,125,.09); border-color: rgba(255,111,125,.28); }
.alert-success { color: #d5ffeb; background: rgba(98,223,157,.08); border-color: rgba(98,223,157,.25); }
.alert-info { color: #dce2ff; background: rgba(124,140,255,.09); border-color: rgba(124,140,255,.25); }

.search-card, .section-block, .result-head, .next-step {
  background: linear-gradient(180deg, rgba(16,29,49,.96), rgba(11,23,40,.96));
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 18px 48px rgba(0,0,0,.16);
}
.search-card { padding: 20px; margin-bottom: 28px; }
.analyze-form { display: flex; align-items: end; gap: 12px; flex-wrap: wrap; }
.field { display: grid; gap: 7px; }
.field.grow { flex: 1 1 650px; }
.field small { color: var(--muted); font-size: 11px; }
.analyze-btn { min-height: 48px; min-width: 170px; }
.advanced-row { flex-basis: 100%; border-top: 1px solid #213149; margin-top: 4px; padding-top: 12px; }
.advanced-row summary { color: #aebdd1; font-size: 13px; font-weight: 700; cursor: pointer; }
.advanced-grid { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: end; margin-top: 14px; }
.check-row { display: flex; align-items: center; gap: 8px; color: #b7c5d8; font-size: 13px; padding-bottom: 11px; }

.spinner { display: none; width: 15px; height: 15px; border: 2px solid rgba(255,255,255,.35); border-top-color: white; border-radius: 50%; animation: spin .8s linear infinite; }
.is-loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.result-head { display: grid; grid-template-columns: 1.1fr .9fr; overflow: hidden; margin: 28px 0 18px; }
.channel-card { display: flex; gap: 18px; align-items: center; padding: 24px; }
.channel-card h2 { margin-bottom: 4px; }
.channel-avatar { width: 76px; height: 76px; object-fit: cover; border-radius: 20px; border: 1px solid #31435e; }
.channel-avatar.placeholder { display: grid; place-items: center; background: #172640; font-weight: 900; }
.tag { display: inline-flex; padding: 5px 9px; border: 1px solid #33445e; border-radius: 999px; background: #0b1626; color: #b9c8db; font-size: 11px; font-weight: 750; }
.score-panel { display: flex; gap: 18px; align-items: center; padding: 24px; background: rgba(124,140,255,.06); border-left: 1px solid var(--line); }
.score-ring { flex: 0 0 auto; width: 96px; height: 96px; display: grid; place-content: center; text-align: center; border-radius: 50%; background: #0a1524; border: 8px solid #33435d; }
.score-ring strong { font-size: 36px; line-height: .9; }
.score-ring span { font-size: 11px; color: var(--muted); }
.score-panel.excellent .score-ring, .score-8, .score-9, .score-10 { border-color: #54d89c; }
.score-panel.good .score-ring, .score-6, .score-7 { border-color: #85d76b; }
.score-panel.medium .score-ring, .score-4, .score-5 { border-color: #f0bd55; }
.score-panel.bad .score-ring, .score-0, .score-1, .score-2, .score-3 { border-color: #ef6f7d; }

.stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-bottom: 18px; }
.stat-card { padding: 16px; background: #0d192a; border: 1px solid var(--line); border-radius: 14px; }
.stat-card span { display: block; min-height: 36px; color: var(--muted); font-size: 11px; font-weight: 700; }
.stat-card strong { font-size: 19px; }

.section-block { padding: 24px; margin: 18px 0; }
.section-block.compact { margin: 0; }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.section-title h2 { margin-bottom: 0; }
.criteria-list { display: grid; gap: 10px; }
.criterion { display: flex; gap: 13px; padding: 14px; border: 1px solid #24344c; background: #0b1626; border-radius: 14px; }
.criterion-icon { width: 32px; height: 32px; flex: 0 0 32px; display: grid; place-items: center; border-radius: 10px; font-weight: 900; }
.criterion.good .criterion-icon { background: rgba(98,223,157,.12); color: var(--good); }
.criterion.medium .criterion-icon { background: rgba(255,198,91,.11); color: var(--warn); }
.criterion.bad .criterion-icon { background: rgba(255,111,125,.11); color: var(--danger); }
.criterion-main { flex: 1; }
.criterion-main p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
.criterion-title { display: flex; justify-content: space-between; gap: 16px; }
.criterion-title span { font-weight: 900; }

.keyword-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.keyword-card, .empty-card { padding: 17px; background: #0b1626; border: 1px solid #24344c; border-radius: 15px; }
.keyword-card h3 { min-height: 48px; margin-bottom: 12px; }
.metric-row { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-top: 1px solid #203047; font-size: 12px; }
.metric-row span { color: var(--muted); }
.error-text { color: #ffabb4; margin-top: 8px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 18px 0; }
.clean-list { padding-left: 18px; color: #c9d5e5; }
.clean-list li { margin: 7px 0; }
.next-step { display: flex; gap: 18px; align-items: center; padding: 24px; margin: 18px 0 36px; border-color: rgba(124,140,255,.35); }
.next-step h2 { font-size: 20px; margin: 0; }
.next-icon { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 15px; background: rgba(124,140,255,.12); color: #b9c3ff; font-size: 24px; }

.guide { margin-top: 38px; }
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.guide-card { position: relative; overflow: hidden; padding: 22px; border: 1px solid #24344c; border-radius: 16px; background: #0b1626; }
.guide-card h3 { margin-bottom: 8px; }
.guide-card p { color: #aab9ce; font-size: 14px; }
.step-num { position: absolute; right: 16px; top: 10px; font-size: 34px; font-weight: 900; color: rgba(147,164,188,.09); }
.mini-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 12px; }
.mini-table td { padding: 7px 4px; border-top: 1px solid #203047; }
.mini-table td:first-child { color: #cdd8e8; font-weight: 800; }
.mini-table td:last-child { text-align: right; color: #9fb0c7; }
.formula { margin-top: 16px; padding: 14px; text-align: center; border: 1px dashed #3a4f70; border-radius: 12px; background: #0e1d31; font-weight: 900; }
.formula-panel { margin-top: 14px; padding: 22px; border: 1px solid rgba(124,140,255,.26); border-radius: 16px; background: rgba(124,140,255,.055); }
.formula-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 16px 0; }
.formula-grid span, .verdict-grid span { padding: 10px 12px; border: 1px solid #2b3b55; background: #0b1626; border-radius: 11px; font-size: 12px; }
.formula-grid b { float: right; color: #b9c3ff; }
.verdict-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.footer { padding: 24px; text-align: center; color: #71839c; font-size: 11px; border-top: 1px solid rgba(45,61,84,.45); }

@media (max-width: 980px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .formula-grid, .verdict-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .topbar { position: static; }
  .brand span:last-child { display: none; }
  .top-actions .secondary-btn { display: none; }
  .page-shell { width: min(100% - 24px, 1180px); padding-top: 34px; }
  .hero { display: block; }
  .api-chip { display: inline-flex; margin-top: 8px; }
  .result-head, .two-col, .keyword-grid, .guide-grid { grid-template-columns: 1fr; }
  .score-panel { border-left: 0; border-top: 1px solid var(--line); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .advanced-grid { grid-template-columns: 1fr; }
  .check-row { padding-bottom: 0; }
  .formula-grid, .verdict-grid { grid-template-columns: 1fr; }
  .login-card { padding: 28px 22px; }
}
@media (max-width: 470px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .channel-card, .score-panel { align-items: flex-start; }
  .channel-avatar { width: 58px; height: 58px; border-radius: 15px; }
  .score-ring { width: 78px; height: 78px; border-width: 6px; }
  .score-ring strong { font-size: 29px; }
  .primary-btn.analyze-btn { width: 100%; }
}

/* v2 — form filling guide */
.fill-guide { margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid #213149; }
.fill-guide-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; margin-bottom: 14px; }
.fill-guide-head h2 { margin: 2px 0 0; font-size: clamp(20px, 2vw, 27px); }
.fill-guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.fill-step { display: flex; gap: 13px; padding: 16px; border: 1px solid #263751; border-radius: 15px; background: #0b1626; }
.fill-step-number { flex: 0 0 32px; width: 32px; height: 32px; display: grid; place-items: center; border-radius: 10px; background: rgba(124,140,255,.13); color: #c9d0ff; font-weight: 900; }
.fill-step h3 { margin: 3px 0 7px; font-size: 15px; }
.fill-step p { margin: 0 0 10px; color: #aebdd1; font-size: 13px; line-height: 1.55; }
.required-badge, .optional-badge { display: inline-flex; margin-left: 5px; padding: 3px 7px; border-radius: 999px; font-size: 9px; vertical-align: 2px; }
.required-badge { color: #ffdce0; background: rgba(255,111,125,.11); border: 1px solid rgba(255,111,125,.22); }
.optional-badge { color: #dce5f3; background: rgba(147,164,188,.08); border: 1px solid #304158; }
.example-list { display: grid; gap: 6px; margin: 10px 0; }
.example-list code { display: block; overflow-wrap: anywhere; white-space: normal; padding: 8px 10px; border-radius: 9px; border: 1px solid #263751; background: #081321; font-size: 11px; }
.example-good { color: #bff5d9; }
.example-bad { color: #ffb7bf; }
.fill-guide-bottom { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.fill-guide-bottom span { padding: 10px 12px; border: 1px dashed #334861; border-radius: 11px; color: #b7c5d8; font-size: 11px; }

@media (max-width: 760px) {
  .fill-guide-grid, .fill-guide-bottom { grid-template-columns: 1fr; }
  .fill-guide-head { display: block; }
  .fill-guide-head .tag { margin-top: 8px; }
}


/* v3 — clearer two-field analyzer form */
.analyze-form-v3 { display: block; }
.form-input-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 14px; }
.input-step { display: inline-grid; place-items: center; width: 22px; height: 22px; margin-right: 5px; border-radius: 7px; background: rgba(124,140,255,.15); color: #d7dcff; font-size: 11px; font-weight: 900; }
.form-actions-v3 { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 14px; padding-top: 14px; border-top: 1px solid #213149; }
.form-actions-v3 .check-row { padding-bottom: 0; }
.form-actions-v3 .analyze-btn { min-width: 180px; }
.field-error { margin-top: 1px; padding: 9px 11px; border: 1px solid rgba(255,111,125,.35); border-radius: 9px; background: rgba(255,111,125,.08); color: #ffb7bf; font-size: 12px; line-height: 1.45; }
.field input.input-invalid { border-color: rgba(255,111,125,.75); box-shadow: 0 0 0 3px rgba(255,111,125,.08); }
.quick-example { margin-top: 12px; padding: 10px 12px; border: 1px dashed #334861; border-radius: 10px; color: #b7c5d8; font-size: 12px; line-height: 1.6; }
.quick-example code { color: #bff5d9; overflow-wrap: anywhere; }

@media (max-width: 840px) {
  .form-input-grid { grid-template-columns: 1fr; }
  .form-actions-v3 { align-items: stretch; flex-direction: column; }
  .form-actions-v3 .analyze-btn { width: 100%; }
}