/* ripchatbot — Forum Design System
   Session 29, 2026-05-16
   Dark theme, source-first, clarity over decoration */

/* ===========================
   CSS Custom Properties
=========================== */
:root {
  --bg:          #0a0a0b;
  --surface:     #111114;
  --card:        #1a1a1f;
  --card-hover:  #1f1f26;
  --border:      #2a2a35;
  --border-light:#3a3a48;

  --text:        #e8e8f0;
  --text-muted:  #8888a0;
  --text-dim:    #555568;

  --orange:      #ff8c42;
  --orange-dim:  rgba(255, 140, 66, 0.12);
  --purple:      #a78bfa;
  --purple-dim:  rgba(167, 139, 250, 0.12);
  --blue:        #60a5fa;
  --blue-dim:    rgba(96, 165, 250, 0.12);
  --green:       #34d399;
  --green-dim:   rgba(52, 211, 153, 0.12);
  --red:         #f87171;
  --red-dim:     rgba(248, 113, 113, 0.12);

  --radius-sm:   4px;
  --radius:      8px;
  --radius-lg:   12px;

  --font:        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono:   "SF Mono", "Fira Code", "Consolas", monospace;

  --transition:  0.15s ease;
}

/* ===========================
   Reset & Base
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--orange);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #ffaa6b; }

img { max-width: 100%; display: block; }

/* ===========================
   Navigation
=========================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav__logo-mark {
  width: 28px;
  height: 30px;
  background: var(--orange);
  border-radius: 11px 11px 3px 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #000;
  padding-bottom: 2px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav__link:hover {
  color: var(--text);
  background: var(--card);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn--primary {
  background: var(--orange);
  color: #000;
}
.btn--primary:hover {
  background: #ffaa6b;
  color: #000;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--ghost:hover {
  border-color: var(--border-light);
  background: var(--card);
  color: var(--text);
}

.btn--small {
  padding: 5px 10px;
  font-size: 0.8rem;
}

/* ===========================
   Layout Container
=========================== */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

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

/* ===========================
   Hero (Landing Page)
=========================== */
.hero {
  padding: 80px 24px 64px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
  background: var(--orange-dim);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 20px;
}

.hero__title em {
  font-style: normal;
  color: var(--orange);
}

.hero__sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 540px;
  margin: 0 auto 36px;
}

.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===========================
   Feature Grid
=========================== */
.features {
  padding: 24px 24px 72px;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  max-width: 860px;
  margin: 0 auto;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--transition);
}
.feature-card:hover {
  border-color: var(--border-light);
}

.feature-card__icon {
  font-size: 1.6rem;
  margin-bottom: 14px;
}

.feature-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.feature-card__body {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===========================
   Team Prompt Section
=========================== */
.team-prompt {
  max-width: 860px;
  margin: 0 auto 64px;
  padding: 0 24px;
}

.team-prompt__header {
  margin-bottom: 16px;
}

.team-prompt__eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-ai);
  display: block;
  margin-bottom: 6px;
}

.team-prompt__title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.team-prompt__sub {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.team-prompt__box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 20px;
}

.team-prompt__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.team-prompt__toolbar-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: monospace;
  letter-spacing: 0.05em;
}

.team-prompt__copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.team-prompt__copy-btn:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.team-prompt__copy-btn.copied {
  color: var(--nuance-green);
  border-color: var(--nuance-green);
}

.team-prompt__code {
  padding: 20px;
  font-family: monospace;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text-muted);
  white-space: pre-wrap;
  overflow-x: auto;
  margin: 0;
}

.team-prompt__code strong {
  color: var(--text);
  font-weight: 700;
}

.team-prompt__bonus {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.team-prompt__bonus-tag {
  background: rgba(52, 211, 153, 0.12);
  color: var(--nuance-green);
  border-radius: 4px;
  padding: 1px 7px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ===========================
   Section Headers
=========================== */
.section-header {
  max-width: 860px;
  margin: 0 auto 24px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.section-header__title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ===========================
   Thread List
=========================== */
.thread-list {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.thread-item {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 8px;
  transition: all var(--transition);
  color: var(--text);
  text-decoration: none;
}
.thread-item:hover {
  border-color: var(--border-light);
  background: var(--card-hover);
  color: var(--text);
  transform: translateY(-1px);
}

.thread-item__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.thread-item__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.thread-meta-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.thread-meta-tag--sources { color: var(--orange); }
.thread-meta-tag--ai { color: var(--purple); }

.nuance-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
}
.nuance-badge--low    { background: var(--red-dim);    color: var(--red); }
.nuance-badge--mid    { background: var(--orange-dim); color: var(--orange); }
.nuance-badge--high   { background: var(--green-dim);  color: var(--green); }

/* ===========================
   Thread View
=========================== */
.thread-view {
  max-width: 740px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

.thread-view__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  transition: color var(--transition);
}
.thread-view__back:hover { color: var(--text); }

.thread-view__header {
  margin-bottom: 28px;
}

.thread-view__title {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.thread-view__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* ===========================
   Nuance Meter
=========================== */
.nuance-meter {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 32px;
}

.nuance-meter__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.nuance-meter__label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.nuance-meter__state {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green);
  transition: all 0.5s ease;
}

.nuance-meter__bar-track {
  height: 6px;
  background: var(--surface);
  border-radius: 3px;
  overflow: hidden;
}

.nuance-meter__bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #f87171 0%, #ff8c42 30%, #34d399 100%);
  border-radius: 3px;
  width: 0%;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.nuance-meter__stages {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
}

.nuance-stage {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  flex: 1;
}
.nuance-stage.active { color: var(--green); font-weight: 600; }

/* ===========================
   Posts
=========================== */
.posts {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.post {
  display: flex;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.post.visible {
  opacity: 1;
  transform: translateY(0);
}

.post:last-child { border-bottom: none; }

.post__avatar {
  flex-shrink: 0;
}

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.avatar--human {
  background: var(--blue-dim);
  color: var(--blue);
  border: 1px solid rgba(96, 165, 250, 0.3);
}

.avatar--human-2 {
  background: rgba(52, 211, 153, 0.12);
  color: var(--green);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.avatar--ai {
  background: var(--purple-dim);
  color: var(--purple);
  border: 1px solid rgba(167, 139, 250, 0.35);
}

.post__body {
  flex: 1;
  min-width: 0;
}

.post__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.post__author {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
}

.post__badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.post__badge--human {
  background: var(--blue-dim);
  color: var(--blue);
}

.post__badge--ai {
  background: var(--purple-dim);
  color: var(--purple);
}

.post__time {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: auto;
}

.post__content {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 12px;
}

.post__content p + p {
  margin-top: 8px;
}

.post__footer {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ===========================
   Source Pill
=========================== */
.source-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--orange-dim);
  color: var(--orange);
  border: 1px solid rgba(255, 140, 66, 0.25);
  text-decoration: none;
  transition: all var(--transition);
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}
.source-pill:hover {
  background: rgba(255, 140, 66, 0.2);
  color: #ffaa6b;
  border-color: rgba(255, 140, 66, 0.45);
}

.source-pill__icon {
  font-style: normal;
  font-size: 0.8rem;
}

/* Nuance delta shown on AI posts */
.nuance-delta {
  font-size: 0.75rem;
  color: var(--green);
  display: flex;
  align-items: center;
  gap: 3px;
  margin-left: auto;
}

/* ===========================
   Email Signup
=========================== */
.signup-section {
  background: var(--card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 48px 24px;
  margin: 48px 0 0;
}

.signup-inner {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.signup-inner h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.signup-inner p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.signup-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.input {
  flex: 1;
  min-width: 180px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);
  transition: border-color var(--transition);
}
.input:focus {
  outline: none;
  border-color: var(--orange);
}
.input::placeholder { color: var(--text-muted); }

/* ===========================
   Post Composer (Demo)
=========================== */
.composer {
  margin-top: 32px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.composer__title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.composer__field {
  margin-bottom: 12px;
}

.composer__label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.composer__label span {
  color: var(--red);
  margin-left: 2px;
}

.textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);  resize: vertical;
  min-height: 100px;
  transition: border-color var(--transition);
}
.textarea:focus {
  outline: none;
  border-color: var(--orange);
}
.textarea::placeholder { color: var(--text-muted); }

/* ===========================
   Category Filter Pills
=========================== */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 24px 16px;
  max-width: 860px;
  margin: 0 auto;
}

.category-pill {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.category-pill:hover {
  border-color: var(--border-light);
  color: var(--text);
  background: var(--card);
}

.category-pill.active {
  background: var(--orange-dim);
  border-color: var(--orange);
  color: var(--orange);
}

/* ===========================
   Responsive
=========================== */
@media (max-width: 600px) {
  .category-filter {
    padding: 0 16px 12px;
    gap: 6px;
  }
  .category-pill {
    font-size: 0.78rem;
    padding: 5px 11px;
  }
}
    padding: 6px 10px;
  }
}

/* ===========================
   Cat Badges
=========================== */
.cat-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
  line-height: 1.5;
}

.cat-badge--ai         { background: var(--purple-dim); color: var(--purple); }
.cat-badge--tech       { background: var(--blue-dim);   color: var(--blue); }
.cat-badge--governance { background: var(--orange-dim); color: var(--orange); }
.cat-badge--finance    { background: var(--green-dim);  color: var(--green); }
.cat-badge--medicine   { background: var(--red-dim);    color: var(--red); }
.cat-badge--healthcare { background: rgba(52, 211, 153, 0.10); color: #6ee7b7; }
.cat-badge--science    { background: rgba(96, 165, 250, 0.10); color: #93c5fd; }
.cat-badge--climate    { background: rgba(167, 139, 250, 0.10); color: #c4b5fd; }
.cat-badge--law        { background: rgba(248, 113, 113, 0.10); color: #fca5a5; }
.cat-badge--economics  { background: rgba(255, 140, 66, 0.10);  color: #fdba74; }
.10);  color: #fdba74; }