/* ============================================
   1. RESET & VARIABLES
   These custom properties (--variable-name) let us
   reuse colors everywhere instead of retyping hex codes.
============================================ */
:root {
  --color-bg: #EFEAE1;        /* parchment page background */
  --color-surface: #FBF8F3;   /* card background, slightly lighter */
  --color-ink: #1E2A3A;       /* main text color, deep navy */
  --color-ink-soft: #5B6B7C;  /* secondary/muted text */
  --color-accent: #E8A33D;    /* amber - buttons, highlights */
  --color-accent-dark: #C9822A;
  --color-teal: #2F6F6B;      /* teal - links, topic tags */
  --color-border: #DCD3C4;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box; /* padding/border no longer add to element width */
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.5;
  transition: background-color 0.15s ease, color 0.15s ease;
}

/* ============================================
   1b. DARK THEME
   Same variable names as :root above, just different values.
   Everything in this file uses var(--color-...) instead of hardcoded
   hex codes, so switching this one attribute re-themes the whole site.
============================================ */
[data-theme="dark"] {
  --color-bg: #1B2430;
  --color-surface: #232D3B;
  --color-ink: #EDEBE3;
  --color-ink-soft: #9FB0C0;
  --color-accent: #E8A33D;
  --color-accent-dark: #F0B65A;
  --color-teal: #4FA39D;
  --color-border: #333F4F;
}

/* A few surfaces that change often enough to feel abrupt without a transition */
.navbar,
.sidebar,
.post-card,
.auth-card,
.search-dropdown,
.comment-item,
.profile-header,
.comment-form-wrapper textarea,
.form-group input,
.form-group select,
.form-group textarea {
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

/* ============================================
   2. NAVBAR
============================================ */
.navbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 32px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.navbar-left a {
  color: inherit; /* stops the browser's default blue/purple link color from
                     overriding the theme - now it pulls from the navbar
                     (which follows --color-ink) instead */
  text-decoration: none;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  color: inherit;
}

.logo-accent {
  color: #F4C430; /* bright yellow, for the "C" in Clook */
}

.navbar-search {
  flex: 1; /* takes up remaining space between logo and buttons */
  max-width: 480px;
  position: relative; /* so the dropdown below can position itself against THIS box */
}

.navbar-search input {
  width: 100%;
  padding: 9px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  background-color: var(--color-bg);
  color: var(--color-ink);
}

.navbar-search input:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 1px;
}

/* Dropdown of matching topics/users that appears under the search box */
.search-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(30, 42, 58, 0.12);
  z-index: 20;
  max-height: 320px;
  overflow-y: auto;
  padding: 8px;
}

.search-dropdown.visible {
  display: block;
}

.search-dropdown-section {
  margin-bottom: 6px;
}

.search-dropdown-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
  padding: 4px 8px;
}

.search-result-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px;
  border: none;
  background: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-ink);
}

.search-result-item:hover {
  background-color: rgba(47, 111, 107, 0.08);
}

.search-result-topic-btn {
  font-family: var(--font-mono);
  color: var(--color-teal);
}

.navbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-right {
  display: flex;
  gap: 10px;
}

.theme-toggle-btn {
  font-size: 0.85rem;
  white-space: nowrap;
}

/* ============================================
   3. BUTTONS
   One .btn base class + modifier classes
   (btn-primary, btn-ghost, etc.) that change color.
============================================ */
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 9px 18px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  display: inline-block;
  text-decoration: none; /* in case .btn is used on an <a> tag */
  text-align: center;
  transition: transform 0.08s ease, background-color 0.15s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-ink);
}
.btn-primary:hover {
  background-color: var(--color-accent-dark);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-ink);
}
.btn-ghost:hover {
  background-color: var(--color-border);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-ink-soft);
}
.btn-outline:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.btn-full {
  width: 100%;
  margin-top: 16px;
}

/* ============================================
   4. LAYOUT (sidebar + feed side by side)
============================================ */
.layout {
  display: flex;
  max-width: 1000px;
  margin: 0 auto;
  gap: 28px;
  padding: 28px 20px;
  align-items: flex-start;
}

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 18px;
  position: sticky;
  top: 80px;
}

.sidebar-heading {
  font-family: var(--font-display);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  margin-bottom: 12px;
}

.topic-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.feed {
  flex: 1;
  min-width: 0; /* prevents flex children from overflowing */
}

.feed-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.feed-header h1 {
  font-family: var(--font-display);
  font-size: 1.5rem;
}

/* ============================================
   5. TOPIC TAGS  (the signature element)
   Styled like little code/hashtag chips.
============================================ */
.topic-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-teal);
  text-decoration: none;
  background-color: rgba(47, 111, 107, 0.08);
  padding: 4px 9px;
  border-radius: 5px;
  display: inline-block;
  transition: background-color 0.15s ease;
}

.topic-tag:hover {
  background-color: rgba(47, 111, 107, 0.16);
}

.topic-tag--active {
  background-color: var(--color-teal);
  color: white;
}

/* ============================================
   6. POST CARDS
============================================ */
.post-card {
  display: flex;
  gap: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
}

.post-votes {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding-top: 2px;
}

.vote-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: var(--color-ink-soft);
  line-height: 1;
  padding: 4px;
}
.vote-btn:hover {
  color: var(--color-accent-dark);
}

.vote-count {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.85rem;
}

.post-body {
  flex: 1;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.meta-text {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-soft);
}

.username {
  color: var(--color-ink);
  text-decoration: none;
}
.username:hover {
  color: var(--color-teal);
}

/* ============================================
   11. PROFILE PAGE
============================================ */
.profile-header {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 24px;
  margin-bottom: 24px;
}

.profile-username {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.profile-joined {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  margin-bottom: 16px;
}

.profile-stats {
  display: flex;
  gap: 28px;
}

.profile-stat-value {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--color-teal);
}

.profile-stat-label {
  font-size: 0.75rem;
  color: var(--color-ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Own-profile "Posts" / "Archived" tab switcher, sitting where a plain
   heading normally would (see profile.js renderTabs()) */
.save-btn--active {
  color: var(--color-accent-dark);
  font-weight: 600;
}

.profile-tabs {
  display: flex;
  gap: 8px;
}

.profile-tab-btn {
  font-family: var(--font-display);
  font-size: 1.1rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-ink-soft);
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}

.profile-tab-btn:hover {
  color: var(--color-ink);
}

.profile-tab-btn--active {
  color: var(--color-ink);
  border-bottom-color: var(--color-teal);
}

/* Shown at the top of an archived post - only its author ever sees this */
.archived-banner {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-dark);
  background-color: rgba(232, 163, 61, 0.12);
  padding: 6px 10px;
  border-radius: 5px;
  display: inline-block;
  margin-bottom: 10px;
}

.archive-toggle-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 5px;
  padding: 4px 10px;
}

.post-title-link {
  text-decoration: none;
  color: inherit;
}
.post-title-link:hover .post-title {
  color: var(--color-teal);
}

.post-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.post-excerpt {
  color: var(--color-ink-soft);
  font-size: 0.92rem;
  margin-bottom: 12px;
}

.post-actions {
  display: flex;
  gap: 18px;
}

.post-action {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  cursor: pointer;
}
.post-action:hover {
  color: var(--color-teal);
}

/* .save-btn is a real <button>, so it inherits the browser's default button
   chrome (grey background, border, padding, system font) unless we strip it
   out ourselves - .post-action alone only sets font-size/color, not those. */
.save-btn {
  background: none;
  border: none;
  font-family: inherit;
  padding: 0;
}

/* ============================================
   7. AUTH PAGES (signup.html / login.html)
============================================ */
.auth-wrapper {
  min-height: calc(100vh - 65px); /* accounts for the navbar now sitting above this on login/signup */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
}

.auth-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 6px;
  display: block;
  text-align: center;
}

.auth-subtitle {
  text-align: center;
  color: var(--color-ink-soft);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  background-color: var(--color-bg);
  color: var(--color-ink);
}

.form-group textarea {
  resize: vertical;
  font-family: var(--font-body);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 1px;
}

.auth-error {
  background-color: rgba(200, 60, 60, 0.1);
  color: #a83a3a;
  font-size: 0.85rem;
  padding: 10px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
  display: none; /* JS shows this only when there's an error */
}

.auth-footer {
  text-align: center;
  margin-top: 18px;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

.auth-footer a {
  color: var(--color-teal);
  font-weight: 600;
  text-decoration: none;
}

/* navbar user display, shown once logged in */
.navbar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.feed-loading,
.feed-empty {
  color: var(--color-ink-soft);
  font-size: 0.92rem;
  padding: 24px;
  text-align: center;
}

/* ============================================
   9. POST DETAIL PAGE + COMMENTS
============================================ */
.post-detail {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 22px 56px 22px 22px;
  margin-bottom: 24px;
  position: relative; /* anchors .post-detail-share-btn to this card's corner */
}

.post-detail-share-btn {
  position: absolute;
  top: 16px;
  right: 16px;
}

.post-detail .post-title {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.post-detail .post-excerpt {
  font-size: 1rem;
  white-space: pre-wrap; /* keeps line breaks the user typed */
}

.comment-form {
  margin-bottom: 24px;
}

.comment-form-wrapper {
  margin-bottom: 28px;
}

.comment-section-heading {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 10px;
}

#comment-form textarea,
.comment-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  background-color: var(--color-surface);
  color: var(--color-ink);
  resize: vertical;
  margin-bottom: 8px;
}

.post-full-body {
  white-space: pre-wrap; /* keeps line breaks the user typed */
  font-size: 1rem;
}

.comment-login-notice {
  background-color: rgba(47, 111, 107, 0.08);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  margin-bottom: 24px;
}

.comment-login-notice a {
  color: var(--color-teal);
  font-weight: 600;
}

.comments-heading {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.comment-thread {
  list-style: none;
}

.comment-item {
  display: flex;
  gap: 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 10px;
}

.comment-main {
  flex: 1;
  min-width: 0;
}

.comment-votes-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.comment-vote-btn {
  font-size: 0.75rem;
  padding: 2px;
}

/* Replies get indented under their parent comment, with a visual guide line */
.comment-replies {
  list-style: none;
  margin-top: 10px;
  padding-left: 18px;
  border-left: 2px solid var(--color-border);
}

.comment-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-soft);
}

.comment-meta .username {
  color: var(--color-ink);
  font-weight: 500;
}

.comment-text,
.comment-body {
  font-size: 0.9rem;
  margin-bottom: 6px;
  white-space: pre-wrap;
}

.comment-actions {
  margin-top: 2px;
}

.comment-reply-btn,
.reply-toggle {
  background: none;
  border: none;
  color: var(--color-teal);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.btn-small {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.reply-form {
  margin-top: 10px;
  display: none; /* shown via JS when "Reply" is clicked */
}

.reply-form.open {
  display: block;
}

.reply-form textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  background-color: var(--color-bg);
  color: var(--color-ink);
  resize: vertical;
  margin-bottom: 6px;
}

.back-link {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--color-ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
}
.back-link:hover {
  color: var(--color-teal);
}

/* Post owner's Delete button - deliberately reddish so it reads as
   destructive, distinct from the neutral Save/Archive actions beside it */
.delete-post-btn {
  color: #C0392B;
}
.delete-post-btn:hover {
  color: #a83022;
}

/* Vote buttons: highlight whichever direction the current user picked */
.vote-btn {
  transition: color 0.1s ease;
}
.vote-btn--active-up {
  color: var(--color-accent-dark);
}
.vote-btn--active-down {
  color: var(--color-teal);
}

/* Inline "+ New topic" form that appears under the sidebar button */
.new-topic-form {
  display: none;
  margin-top: 10px;
  gap: 6px;
  flex-direction: column;
}
.new-topic-form.open {
  display: flex;
}
.new-topic-form input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  background-color: var(--color-bg);
  color: var(--color-ink);
}
.new-topic-error {
  font-size: 0.78rem;
  color: #C0392B;
  display: none;
}

/* Pagination controls under the feed */
.pagination-controls {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.pagination-btn {
  min-width: 34px;
  padding: 7px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
}
.pagination-btn:hover:not(:disabled) {
  border-color: var(--color-teal);
  color: var(--color-teal);
}
.pagination-btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.pagination-btn--active {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: white;
}

/* "View more" link at the bottom of the sidebar topic list */
.view-more-topics-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  text-decoration: none;
  padding: 4px 2px;
}
.view-more-topics-link:hover {
  color: var(--color-teal);
}

/* Small local preview shown on create-post.html after picking a file, before
   it's ever uploaded anywhere - kept modest in size so it doesn't blow out
   the form layout the way the raw image would at full resolution. */
.media-preview-img {
  display: block;
  width: 100%;
  max-height: 260px;
  object-fit: contain;
  border-radius: 8px;
  margin-top: 10px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
}

/* ============================================
   12. ICON BUTTONS (save / share / archive / delete)
   Icons only, no labels - replaces the old emoji+text action buttons.
============================================ */
.post-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* Icon buttons always sit at the far right of their .post-actions row,
   whether there's a comments link to their left (feed/profile cards) or
   they're the only thing in the row (post detail page). */
.post-actions-icons {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  color: var(--color-ink-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, background-color 0.15s ease;
}
.icon-btn:hover {
  color: var(--color-teal);
  background-color: rgba(47, 111, 107, 0.08);
}
.icon-btn svg {
  display: block;
}

/* Bookmark fills solid (via the SVG's fill attribute) and tints amber once saved */
.save-icon-btn--active,
.save-icon-btn--active:hover {
  color: var(--color-accent-dark);
}

/* Archive icon tints amber while the post is archived, as a quick "this is
   in its archived state" signal - same color language as the archived banner */
.archive-icon-btn--active,
.archive-icon-btn--active:hover {
  color: var(--color-accent-dark);
}

.delete-icon-btn:hover {
  color: #C0392B;
  background-color: rgba(192, 57, 43, 0.08);
}

/* ============================================
   13. SHARE MODAL
   Centered popup (link + copy button + post info), same idea as YouTube's
   share dialog - built and torn down purely in JS, not sitting in the HTML.
============================================ */
.share-modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 20, 28, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.share-modal {
  width: 100%;
  max-width: 420px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 26px;
  position: relative;
}

.share-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-ink-soft);
  font-size: 1.1rem;
  line-height: 1;
  padding: 4px;
}
.share-modal-close:hover {
  color: var(--color-ink);
}

.share-modal-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 18px;
  padding-right: 24px;
}

.share-modal-link-row {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.share-modal-link-input {
  flex: 1;
  min-width: 0;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.share-modal-copy-btn {
  white-space: nowrap;
}

.share-modal-meta {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.share-modal-meta strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* Floating "Support" button - own-profile only (see profile.js) - pinned to
   the page's top-right corner, just under the sticky navbar. */
.support-fab-btn {
  position: fixed;
  top: 74px;
  right: 24px;
  z-index: 5;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(30, 42, 58, 0.18);
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.08s ease;
}
.support-fab-btn:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}
.support-fab-btn:active {
  transform: scale(0.97);
}

/* topics.html - full topic list, grouped by starting letter into a 3-column
   grid (A/D/G... left, B/E/H... center, C/F/I... right). Using grid (not 3
   separate flex columns) means each ROW auto-sizes to its tallest cell, so
   e.g. row 2 (D/E/F) always starts at the same height across all 3 columns
   no matter how many topics are in A, B, or C above it. */
.topics-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}
.topics-letter-heading {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-teal);
  padding-bottom: 6px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}
.topics-letter-topics {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.topics-letter-topics .topic-tag {
  width: fit-content;
}

/* ============================================
   10. RESPONSIVE: stack sidebar above feed on mobile
============================================ */
@media (max-width: 720px) {
  .layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    position: static;
  }
  .navbar-search {
    display: none; /* hide search bar on very small screens for now */
  }
  .topics-columns {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}