/* ==========================================================================
   Page-specific styles
   ========================================================================== */

/* ---------- home: feed tabs + composer prompt ---------- */

.feed-tabs {
  position: sticky;
  top: calc(var(--topbar-h) + var(--safe-top));
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: top var(--dur-slow) var(--ease-out);
}

html[data-scroll="down"] .feed-tabs {
  top: 0;
}

.feed-tabs__tab {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  color: var(--text-2);
  font-weight: 600;
  transition: color var(--dur-fast), background-color var(--dur-fast);
}

.feed-tabs__tab:hover {
  background: var(--accent-softer);
}

.feed-tabs__tab.is-active {
  color: var(--text);
}

.feed-tabs__tab.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 56px;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--accent);
  transform: translateX(-50%);
  animation: tab-in var(--dur-slow) var(--ease-spring);
}

.feed-tabs__tab[aria-disabled="true"] {
  color: var(--text-3);
  cursor: default;
}

@keyframes tab-in {
  from {
    width: 0;
  }
}

@media (min-width: 768px) {
  .feed-tabs {
    top: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
  }
}

.composer-prompt {
  display: none;
}

@media (min-width: 768px) {
  .composer-prompt {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    margin-top: var(--space-3);
    padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
    text-align: left;
    transition: border-color var(--dur-fast);
  }

  .composer-prompt:hover {
    border-color: var(--border-strong);
  }

  .composer-prompt__text {
    flex: 1;
    color: var(--text-3);
    font-family: var(--font-text);
    font-size: var(--fs-lg);
  }
}

/* ---------- page header with back button (detail, about) ---------- */

.page-header {
  position: sticky;
  top: calc(var(--topbar-h) + var(--safe-top));
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 52px;
  padding: 0 var(--space-2);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  transition: top var(--dur-slow) var(--ease-out);
}

html[data-scroll="down"] .page-header {
  top: 0;
}

.page-header__title {
  font-size: var(--fs-xl);
}

@media (min-width: 768px) {
  .page-header {
    top: 0;
    padding: 0;
  }
}

.section-title {
  padding: var(--space-5) var(--space-4) 0;
  font-size: var(--fs-lg);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.section-title .muted {
  font-size: var(--fs-sm);
  font-weight: 500;
}

@media (min-width: 768px) {
  .section-title {
    padding-left: var(--space-1);
  }
}

/* ---------- post detail ---------- */

.detail {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2) 0;
}

@media (min-width: 768px) {
  .detail {
    padding: var(--space-2) 0 0;
  }
}

.comments {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.comment {
  padding: var(--space-3) var(--space-4) var(--space-1);
}

.comment .post__body {
  margin-top: var(--space-2);
  padding-left: calc(36px + var(--space-3));
}

.comment .post__actions {
  padding-left: calc(36px + var(--space-3) - var(--space-2));
}

.comment .prose {
  font-size: 0.97rem;
}

/* ---------- profile ---------- */

.profile {
  padding: var(--space-3) var(--space-2) 0;
}

.profile .feed {
  padding-left: 0;
  padding-right: 0;
}

@media (min-width: 768px) {
  .profile {
    padding: 0;
  }
}

.profile-card {
  position: relative;
  overflow: hidden;
  padding: 0 var(--space-5) var(--space-5);
  animation: post-in var(--dur-slow) var(--ease-out);
}

.profile-card__banner {
  height: 96px;
  margin: 0 calc(var(--space-5) * -1);
  background:
    radial-gradient(120% 140% at 0% 0%, var(--surface-3) 0%, transparent 55%),
    radial-gradient(120% 140% at 100% 100%, var(--surface-2) 0%, transparent 60%),
    var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.profile-card__top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: -48px;
}

.profile-card__avatar {
  border: 4px solid var(--surface);
  box-sizing: content-box;
}

.profile-card__name {
  margin-top: var(--space-3);
  font-size: var(--fs-2xl);
  overflow-wrap: anywhere;
}

.profile-card__bio {
  margin-top: var(--space-1);
  color: var(--text-2);
  font-family: var(--font-text);
  overflow-wrap: anywhere;
}

.profile-card__joined {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  color: var(--text-3);
  font-size: var(--fs-sm);
  --icon-size: 16px;
}

.profile-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-5);
  margin-top: var(--space-3);
  color: var(--text-2);
  font-size: var(--fs-sm);
}

.profile-card__stats strong {
  color: var(--text);
  font-size: var(--fs-md);
  font-variant-numeric: tabular-nums;
}

.profile-card__actions {
  display: flex;
  gap: var(--space-2);
  padding-bottom: var(--space-1);
}

.btn--following {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
}

.btn--following:hover .label-default {
  display: none;
}

.btn--following .label-hover {
  display: none;
}

.btn--following:hover .label-hover {
  display: inline;
  color: var(--danger);
}

.avatar-edit {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.avatar-edit__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ---------- auth (login) ---------- */

.auth {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding: calc(var(--space-6) + var(--safe-top)) var(--space-4) calc(var(--space-6) + var(--safe-bottom));
}

.auth__card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  width: 100%;
  max-width: 380px;
  animation: pop-in 480ms var(--ease-spring) both;
}

.auth__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
}

.auth__brand .brand-wordmark {
  height: 96px; /* same presence as the original login wordmark */
  animation: wordmark-in 640ms var(--ease-spring) both;
}

.auth__tagline {
  color: var(--text-2);
  text-align: center;
  animation: post-in 520ms 200ms var(--ease-out) both;
}

@keyframes wordmark-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.9);
  }
}

/* Login / signup switch: a pill slides under the active tab. */
.auth-tabs {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px;
  border-radius: var(--radius-full);
  background: var(--surface-2);
  border: 1px solid var(--border);
  animation: post-in 520ms 120ms var(--ease-out) both;
}

.auth-tabs::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 4px;
  width: calc(50% - 4px);
  border-radius: var(--radius-full);
  background: var(--accent);
  transform: translateX(calc(var(--tab, 0) * 100%));
  transition: transform var(--dur-slow) var(--ease-spring);
}

.auth-tabs__tab {
  position: relative; /* above the pill */
  display: grid;
  place-items: center;
  min-height: var(--tap);
  border-radius: var(--radius-full);
  color: var(--text-2);
  font-weight: 600;
  transition: color var(--dur-base);
}

.auth-tabs__tab[aria-selected="true"] {
  color: var(--on-accent);
}

.auth-panel {
  animation: auth-swap 280ms var(--ease-out) both;
}

@keyframes auth-swap {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

.auth__switch {
  margin-top: var(--space-4);
  color: var(--text-2);
  font-size: var(--fs-sm);
  text-align: center;
}

.auth__switch a {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* "Request access" card, under both forms */
.auth__request {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 64px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: var(--fs-sm);
  transition: border-color var(--dur-fast), transform var(--dur-base) var(--ease-out);
}

.auth__request strong {
  display: block;
  color: var(--text);
  font-size: var(--fs-md);
}

.auth__request:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.auth__request .icon {
  flex: none;
  color: var(--text);
}

/* @username field */
.input-prefix {
  position: relative;
}

.input-prefix > span {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  font-weight: 600;
  pointer-events: none;
}

.input-prefix .input {
  padding-left: calc(var(--space-4) + 18px);
}

.field__status {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 20px;
  color: var(--text-3);
  font-size: var(--fs-sm);
  font-weight: 500;
}

.field__status:empty,
.field__status:not(:has(span:not(:empty))) {
  min-height: 0;
}

.field__status.is-ok {
  color: var(--success);
}

.field__status.is-error {
  color: var(--danger);
}

.field__status .icon {
  flex: none;
}

.input--code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.input--code::placeholder {
  letter-spacing: 0.08em;
}

/* password strength: bars carry the level, the label says it in words */
.strength {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-1);
  animation: fade-in var(--dur-base) var(--ease-out);
  --level: var(--danger);
}

.strength[data-score="2"] {
  --level: var(--warning);
}

.strength[data-score="3"],
.strength[data-score="4"] {
  --level: var(--success);
}

.strength__bars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.strength__bars span {
  height: 4px;
  border-radius: 2px;
  background: var(--surface-3);
  transition: background-color var(--dur-base);
}

.strength[data-score="1"] .strength__bars span:nth-child(-n + 1),
.strength[data-score="2"] .strength__bars span:nth-child(-n + 2),
.strength[data-score="3"] .strength__bars span:nth-child(-n + 3),
.strength[data-score="4"] .strength__bars span {
  background: var(--level);
}

.strength__label {
  color: var(--text-2);
  font-size: var(--fs-sm);
}

.strength__label strong {
  color: var(--text);
}

.rules {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  color: var(--text-3);
  font-size: var(--fs-xs);
  --icon-size: 14px;
}

.rules li {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.rules li.is-ok {
  color: var(--text-2);
}

.rules li.is-ok .icon {
  color: var(--success);
}

.auth__footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--text-3);
}

.auth__footer a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
}

.auth__footer a:hover {
  color: var(--text);
}

.password-field {
  position: relative;
}

.password-field .input {
  padding-right: 52px;
}

.password-field .icon-btn {
  position: absolute;
  right: 2px;
  top: 2px;
}

/* ---------- about & support ---------- */

.link-list {
  display: flex;
  flex-direction: column;
  padding: var(--space-2);
}

.link-list__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 56px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: background-color var(--dur-fast);
}

.link-list__item:hover {
  background: var(--accent-soft);
}

.link-list__item .icon:last-child {
  margin-left: auto;
  color: var(--text-3);
  --icon-size: 18px;
}

.about-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4) var(--space-6);
  text-align: center;
}

.about-hero .brand-wordmark {
  height: 64px;
}

.standalone {
  max-width: 640px;
  margin: 0 auto;
  padding: calc(var(--space-4) + var(--safe-top)) var(--space-4) calc(var(--space-10) + var(--safe-bottom));
}

.standalone__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap);
  color: var(--text-2);
  font-weight: 500;
}

.standalone__back:hover {
  color: var(--text);
}

.support-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.support-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
}

.support-card__title {
  font-size: var(--fs-lg);
}

.support-card p {
  color: var(--text-2);
  font-size: var(--fs-sm);
}

.kofi-frame {
  width: 100%;
  height: 560px;
  margin-top: var(--space-6);
  border: 0;
  border-radius: var(--radius-lg);
  background: #fff;
}