:root {
  --bg: #f8fafc;
  --ink: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --panel: #ffffff;
  --accent: #374151;
  --accent-dark: #202124;
  --rose: #d93025;
  --gold: #fbbc04;
  --blue: #174ea6;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, #ffffff 0, #f8fafc 340px),
    var(--bg);
  color: var(--ink);
}

.app-header {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 18px;
  padding: 22px clamp(18px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .88);
  position: sticky;
  top: 0;
  z-index: 5;
}

h1 {
  font-size: clamp(1.45rem, 2.4vw, 2.3rem);
  margin: 0;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--accent-dark);
  font-weight: 700;
  text-transform: uppercase;
  font-size: .75rem;
}

main {
  padding: 24px clamp(18px, 4vw, 48px) 42px;
}

.tabs {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: #f1f5f9;
  padding: 3px;
}

.tab, button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  padding: 10px 14px;
  font-weight: 700;
  border-radius: 999px;
  cursor: pointer;
}

.tab {
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  border: 0;
}

.tab.active {
  background: var(--accent);
  color: #fff;
}

.secondary { background: #ffffff; color: var(--ink); border-color: var(--line); }
.danger { background: var(--rose); }

.icon-button {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
}

.view { display: none; }
.view.active { display: block; }

.search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: end;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 700;
}

input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 11px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

textarea {
  min-height: 106px;
  resize: vertical;
}

.suggestions {
  min-height: 26px;
  color: var(--accent-dark);
  font-weight: 700;
}

.source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.source-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  min-height: 180px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.source-card h2 {
  font-size: 1.05rem;
  margin: 0;
}

.meta {
  color: var(--muted);
  font-size: .9rem;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  border: 1px solid #b7d8d3;
  color: var(--accent-dark);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: .78rem;
  font-weight: 700;
}

.source-form {
  display: grid;
  gap: 18px;
  max-width: 1160px;
}

fieldset {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background: var(--panel);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

legend {
  padding: 0 8px;
  color: var(--blue);
  font-weight: 800;
}

.wide { grid-column: 1 / -1; }

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.graph-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

#graphCanvas {
  width: 100%;
  height: min(72vh, 760px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #f8fafc;
  display: block;
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    linear-gradient(180deg, #ffffff 0, #f8fafc 420px),
    var(--bg);
  padding: 28px;
}

.login-panel {
  width: min(92vw, 560px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 34px 44px 38px;
  box-shadow: 0 18px 48px rgba(16, 24, 40, .08);
  display: grid;
  justify-items: center;
}

.login-panel h1 {
  margin: 18px auto 0;
  color: #182230;
  font-size: clamp(1.45rem, 2.7vw, 1.95rem);
  line-height: 1.08;
  letter-spacing: 0;
  white-space: nowrap;
  text-align: center;
  width: min(100%, 460px);
}

.login-logo {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: #202124;
  color: #fff;
  font: 850 .86rem Inter, "Segoe UI", sans-serif;
  letter-spacing: 0;
  margin: 0 auto;
  text-align: center;
}

.login-form {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  width: min(100%, 460px);
  justify-self: center;
}

.login-form label {
  color: #5f6b7a;
}

.login-form input {
  min-height: 48px;
  border-radius: 12px;
  border-color: #dfe3ea;
  background: #fff;
}

.login-form input:focus {
  border-color: #aeb7c3;
  box-shadow: 0 1px 6px rgba(32,33,36,.14);
}

.login-form button {
  margin-top: 4px;
  min-height: 48px;
  background: #202124;
  border-color: #202124;
  border-radius: 999px;
  box-shadow: none;
}

.login-form button:hover {
  background: #374151;
  border-color: #374151;
}

.error {
  color: var(--rose);
  min-height: 20px;
  margin: 0;
}

@media (max-width: 760px) {
  .app-header { grid-template-columns: 1fr auto; }
  .tabs {
    grid-column: 1 / -1;
    order: 3;
  }
  .search-row, fieldset { grid-template-columns: 1fr; }
}