:root {
  --bg: #0b0d12;
  --bg-soft: #12151d;
  --surface: #161a24;
  --surface-2: #1d2230;
  --border: #262c3a;
  --text: #e8ebf2;
  --muted: #8b93a7;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --danger: #ff5470;
  --radius: 14px;
  --shadow: 0 10px 40px -12px rgba(0, 0, 0, 0.6);
  --grad: linear-gradient(135deg, var(--accent), var(--accent-2));
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.2s ease, background 0.2s ease;
}
.btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}
.btn-primary {
  background: var(--grad);
  border: none;
  color: #fff;
  box-shadow: 0 8px 24px -8px rgba(124, 92, 255, 0.6);
}
.btn-ghost {
  background: transparent;
}
.btn-danger {
  color: var(--danger);
  border-color: transparent;
  background: transparent;
  padding: 6px 10px;
}
.btn-danger:hover {
  border-color: var(--danger);
}
.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11, 13, 18, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}
.logo .spark {
  font-size: 1.4rem;
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Landing ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 120px 0 100px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(
    circle,
    rgba(124, 92, 255, 0.25),
    transparent 60%
  );
  filter: blur(40px);
  z-index: -1;
}
.badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 28px;
  background: var(--surface);
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 22px;
}
.hero p.sub {
  font-size: 1.2rem;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 38px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  padding: 40px 0 120px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.18s ease, border-color 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}
.feature-card .icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
  display: block;
}
.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}
.feature-card p {
  color: var(--muted);
  font-size: 0.95rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* ---------- App ---------- */
.app-main {
  padding: 40px 0 80px;
}
.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.app-header h1 {
  font-size: 2rem;
  letter-spacing: -0.02em;
}
.app-header p {
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.panel h2 {
  font-size: 1.05rem;
  margin-bottom: 16px;
}

/* Forms */
.field {
  margin-bottom: 14px;
}
.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}
input[type="text"],
textarea {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 11px 13px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s ease;
}
input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

/* Idea list */
.ideas-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 70vh;
  overflow-y: auto;
}
.idea-item {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.18s ease, transform 0.12s ease;
}
.idea-item:hover {
  border-color: var(--accent);
  transform: translateX(2px);
}
.idea-item.active {
  border-color: var(--accent);
  background: var(--surface-2);
}
.idea-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}
.idea-item .meta {
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  gap: 10px;
}
.pill {
  background: rgba(124, 92, 255, 0.15);
  color: #b9a8ff;
  padding: 1px 8px;
  border-radius: 999px;
  font-weight: 600;
}

/* Detail */
.detail-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}
.detail-head h2 {
  font-size: 1.5rem;
  margin: 0;
}
.detail-desc {
  color: var(--muted);
  margin-bottom: 4px;
  white-space: pre-wrap;
}
.detail-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 24px;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 18px 0;
}

/* Notes / comments */
.note {
  display: flex;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.note:last-child {
  border-bottom: none;
}
.note .avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--grad);
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
}
.note-body {
  flex: 1;
  min-width: 0;
}
.note-body .text {
  white-space: pre-wrap;
  word-wrap: break-word;
}
.note-time {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.note-time .del {
  color: var(--danger);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.note:hover .note-time .del {
  opacity: 1;
}

.note-composer {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.note-composer .row {
  display: flex;
  justify-content: flex-end;
}

/* Empty / states */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 60px 20px;
}
.empty .big {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 12px;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 12px 20px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease;
  z-index: 100;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}
.toast.error {
  border-color: var(--danger);
}