/*
 * Openbook - foglio di stile principale.
 * Scritto a mano, senza framework CSS esterni e senza dipendenze da CDN,
 * per rispettare i vincoli di installazione su shared hosting e la
 * politica privacy-first del progetto (nessuna risorsa remota obbligatoria).
 */

:root {
  color-scheme: light;

  --ob-color-bg: #f0f2f5;
  --ob-color-surface: #ffffff;
  --ob-color-border: #dde1e6;
  --ob-color-text: #1c1e21;
  --ob-color-text-muted: #5b6270;
  --ob-color-primary: #1877f2;
  --ob-color-primary-dark: #145dbf;
  --ob-color-primary-soft: #e7f0fe;
  --ob-color-primary-contrast: #ffffff;
  --ob-color-danger: #b3261e;
  --ob-color-success: #1e6b3e;
  --ob-radius: 10px;
  --ob-shadow: 0 1px 2px rgba(20, 24, 34, 0.06), 0 1px 8px rgba(20, 24, 34, 0.05);
  --ob-max-width: 680px;
  --ob-max-width-wide: 1200px;
  --ob-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--ob-font);
  background: var(--ob-color-bg);
  color: var(--ob-color-text);
  line-height: 1.5;
  font-size: 16px;
}

a {
  color: var(--ob-color-primary);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--ob-color-primary);
  outline-offset: 2px;
}

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

h1, h2, h3, h4 {
  line-height: 1.25;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

.ob-skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ob-color-primary);
  color: #fff;
  padding: 0.75em 1em;
  z-index: 1000;
  border-radius: 0 0 var(--ob-radius) 0;
}

.ob-skip-link:focus {
  left: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */

.ob-header {
  background: var(--ob-color-surface);
  border-bottom: 1px solid var(--ob-color-border);
  position: sticky;
  top: 0;
  z-index: 30;
}

.ob-header__inner {
  max-width: var(--ob-max-width-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 1.25rem;
}

.ob-header__start {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ob-brand {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ob-color-primary);
  letter-spacing: -0.02em;
}

.ob-brand:hover,
.ob-brand:focus {
  text-decoration: none;
}

.ob-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.ob-nav--icons {
  gap: 0.4rem;
}

.ob-nav--icons form {
  display: inline-flex;
}

.ob-header__end {
  position: relative;
  display: flex;
  align-items: center;
}

.ob-nav__label {
  display: none;
}

.ob-nav__link {
  padding: 0.5rem 0.9rem;
  border-radius: var(--ob-radius);
  color: var(--ob-color-text);
  font-weight: 500;
}

.ob-nav__link:hover,
.ob-nav__link:focus {
  background: var(--ob-color-bg);
  text-decoration: none;
}

.ob-icon-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: var(--ob-color-bg);
  color: var(--ob-color-text);
  cursor: pointer;
  flex-shrink: 0;
}

.ob-icon-btn:hover,
.ob-icon-btn:focus-visible {
  background: var(--ob-color-primary-soft);
  color: var(--ob-color-primary);
  text-decoration: none;
}

.ob-icon-btn .ob-icon {
  width: 20px;
  height: 20px;
}

.ob-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.ob-sidebar-toggle,
.ob-nav-toggle {
  display: none;
}

.ob-header__avatar-link {
  display: inline-flex;
  border-radius: 50%;
}

.ob-badge-dot {
  position: absolute;
  top: -2px;
  right: -2px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 999px;
  background: var(--ob-color-danger);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ob-color-surface);
}

/* Buttons */

.ob-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  padding: 0.6rem 1.1rem;
  border-radius: var(--ob-radius);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--ob-color-bg);
  color: var(--ob-color-text);
}

.ob-btn:hover {
  text-decoration: none;
  filter: brightness(0.97);
}

.ob-btn--primary {
  background: var(--ob-color-primary);
  color: var(--ob-color-primary-contrast);
}

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

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

.ob-btn--block {
  width: 100%;
}

.ob-btn--small {
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
}

.ob-btn .ob-icon {
  width: 17px;
  height: 17px;
}

/* Layout */

.ob-shell {
  max-width: var(--ob-max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.ob-shell--with-sidebars {
  max-width: var(--ob-max-width-wide);
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 300px;
  align-items: start;
  gap: 1.5rem;
}

.ob-main {
  min-width: 0;
}

.ob-sidebar {
  position: sticky;
  top: calc(1.5rem + 60px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.ob-card {
  background: var(--ob-color-surface);
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius);
  box-shadow: var(--ob-shadow);
  padding: 1.5rem;
}

.ob-card + .ob-card {
  margin-top: 1rem;
}

.ob-sidebar .ob-card + .ob-card {
  margin-top: 0;
}

.ob-narrow {
  max-width: 420px;
  margin: 2rem auto;
}

/* Sidebar sinistra */

.ob-mini-profile {
  padding: 1rem;
}

.ob-mini-profile__link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ob-color-text);
}

.ob-mini-profile__link:hover {
  text-decoration: none;
}

.ob-mini-profile__name {
  font-weight: 700;
}

.ob-mini-profile__handle {
  color: var(--ob-color-text-muted);
  font-size: 0.85rem;
}

.ob-side-nav {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.ob-side-nav form {
  display: contents;
}

.ob-side-nav__link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--ob-radius);
  color: var(--ob-color-text);
  font-weight: 600;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
}

.ob-side-nav__link:hover,
.ob-side-nav__link:focus-visible {
  background: var(--ob-color-bg);
  text-decoration: none;
}

.ob-side-nav__link.is-active {
  background: var(--ob-color-primary-soft);
  color: var(--ob-color-primary);
}

.ob-side-nav__link .ob-icon {
  width: 20px;
  height: 20px;
  color: var(--ob-color-primary);
  flex-shrink: 0;
}

.ob-badge-count {
  margin-left: auto;
  background: var(--ob-color-danger);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
}

/* Sidebar destra */

.ob-side-widget__title {
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
}

.ob-side-widget__instance {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-bottom: 0.35rem;
}

.ob-suggestion {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--ob-color-border);
}

.ob-suggestion:first-of-type {
  border-top: none;
  padding-top: 0;
}

/* Menu mobile */

.ob-sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 34, 0.4);
  z-index: 29;
}

.ob-sidebar-overlay[hidden] {
  display: none;
}

/* Forms */

.ob-field {
  margin-bottom: 1.1rem;
}

.ob-field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.ob-field input[type='text'],
.ob-field input[type='email'],
.ob-field input[type='password'],
.ob-field input[type='url'],
.ob-field textarea,
.ob-field select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius);
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  color: var(--ob-color-text);
}

.ob-field textarea {
  resize: vertical;
  min-height: 5rem;
}

.ob-field input:focus,
.ob-field textarea:focus,
.ob-field select:focus {
  border-color: var(--ob-color-primary);
}

.ob-field__help {
  font-size: 0.85rem;
  color: var(--ob-color-text-muted);
  margin-top: 0.3rem;
}

.ob-field__error {
  font-size: 0.85rem;
  color: var(--ob-color-danger);
  margin-top: 0.3rem;
}

.ob-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 400;
}

/* Impostazioni */

.ob-settings-link-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.ob-settings-link-row input[type='text'] {
  flex: 0 0 35%;
}

.ob-settings-link-row input[type='url'] {
  flex: 1;
}

.ob-settings-avatar-picker {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.ob-settings-cover-preview {
  width: 100%;
  max-height: 160px;
  object-fit: cover;
  border-radius: var(--ob-radius);
  margin-bottom: 0.5rem;
  display: block;
}

/* Alerts */

.ob-alert {
  padding: 0.85rem 1rem;
  border-radius: var(--ob-radius);
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.ob-alert--success {
  background: #e9f6ee;
  border-color: #bfe3cb;
  color: var(--ob-color-success);
}

.ob-alert--error {
  background: #fbebe9;
  border-color: #f0c4bf;
  color: var(--ob-color-danger);
}

.ob-alert--info {
  background: var(--ob-color-primary-soft);
  border-color: #cfe0fb;
  color: var(--ob-color-text-muted);
}

.ob-alert ul {
  margin: 0.3em 0 0 1.2em;
  padding: 0;
}

/* Profile */

.ob-profile-cover {
  height: 180px;
  border-radius: var(--ob-radius) var(--ob-radius) 0 0;
  background: linear-gradient(135deg, var(--ob-color-primary), var(--ob-color-primary-dark));
}

.ob-profile-header {
  padding: 0 1.5rem 1.5rem;
  position: relative;
}

.ob-profile-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 4px solid var(--ob-color-surface);
  background: var(--ob-color-bg);
  margin-top: -48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: var(--ob-color-primary);
  overflow: hidden;
}

.ob-profile-name {
  margin-top: 0.75rem;
}

.ob-profile-handle {
  color: var(--ob-color-text-muted);
  font-size: 0.95rem;
}

.ob-profile-stats {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.ob-profile-stats strong {
  display: block;
  font-size: 1.1rem;
}

.ob-profile-stats span {
  color: var(--ob-color-text-muted);
  font-size: 0.85rem;
}

.ob-profile-stats a {
  color: var(--ob-color-text);
}

.ob-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: var(--ob-color-bg);
  border: 1px solid var(--ob-color-border);
  font-size: 0.8rem;
  color: var(--ob-color-text-muted);
}

.ob-empty-state {
  text-align: center;
  color: var(--ob-color-text-muted);
  padding: 2rem 1rem;
}

/* Home hero */

.ob-hero {
  text-align: center;
  padding: 3rem 1rem;
}

.ob-hero h1 {
  font-size: 2rem;
}

.ob-hero p {
  color: var(--ob-color-text-muted);
  max-width: 46ch;
  margin: 0 auto 1.5rem;
}

.ob-hero-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.ob-footer {
  text-align: center;
  color: var(--ob-color-text-muted);
  font-size: 0.85rem;
  padding: 2rem 1rem;
}

/* Composer */

.ob-composer__main {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.ob-composer__body-field {
  flex: 1 1 auto;
  margin-bottom: 0;
}

.ob-composer__main textarea {
  border-radius: 1.25rem;
  background: var(--ob-color-bg);
  border-color: transparent;
  resize: none;
}

.ob-composer__main textarea:focus {
  background: var(--ob-color-surface);
  border-color: var(--ob-color-primary);
}

.ob-composer__panel {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--ob-color-border);
}

.ob-composer__panel .ob-field {
  margin-bottom: 0.75rem;
}

.ob-composer__panel .ob-field:last-child {
  margin-bottom: 0;
}

.ob-composer__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.85rem;
  padding-top: 0.6rem;
}

.ob-composer__toggles {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.ob-composer__toggle.is-active {
  background: var(--ob-color-primary-soft);
  color: var(--ob-color-primary);
}

/* Post */

.ob-post {
  padding: 1.25rem 1.5rem;
}

.ob-post__header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.ob-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ob-color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--ob-color-primary);
  overflow: hidden;
  flex-shrink: 0;
}

.ob-avatar img,
.ob-profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ob-post__meta {
  min-width: 0;
}

.ob-post__author {
  font-weight: 600;
  color: var(--ob-color-text);
}

.ob-post__author:hover {
  text-decoration: none;
}

.ob-post__handle,
.ob-post__time {
  color: var(--ob-color-text-muted);
  font-size: 0.85rem;
}

.ob-post__title {
  margin-bottom: 0.4rem;
}

.ob-post__body {
  white-space: normal;
  overflow-wrap: anywhere;
}

.ob-post__body .hashtag,
.ob-post__body .mention {
  font-weight: 600;
}

.ob-post__cw {
  border: 1px solid var(--ob-color-border);
  border-radius: var(--ob-radius);
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.75rem;
}

.ob-post__cw summary {
  cursor: pointer;
  font-weight: 600;
}

.ob-post__cw[open] summary {
  margin-bottom: 0.6rem;
}

.ob-post__media {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.ob-post__media img {
  border-radius: var(--ob-radius);
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-height: 360px;
}

.ob-post__hashtags {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.ob-post__deleted {
  color: var(--ob-color-text-muted);
  font-style: italic;
}

.ob-post__actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--ob-color-border);
  flex-wrap: wrap;
}

.ob-post__actions form {
  display: inline-flex;
}

.ob-post__actions .ob-btn {
  flex: 1 1 auto;
  justify-content: center;
}

.ob-post__actions .ob-btn--active {
  background: var(--ob-color-primary-soft);
  color: var(--ob-color-primary);
}

/* Comments */

.ob-comment {
  border-top: 1px solid var(--ob-color-border);
  padding-top: 0.9rem;
  margin-top: 0.9rem;
}

.ob-comment__body {
  overflow-wrap: anywhere;
}

.ob-comment .ob-post__actions {
  border-top: none;
  padding-top: 0.4rem;
  margin-top: 0.4rem;
  gap: 0.25rem;
}

.ob-comment .ob-post__actions .ob-btn {
  flex: 0 0 auto;
  justify-content: flex-start;
}

.ob-comment__replies {
  margin-left: 1.5rem;
  border-left: 2px solid var(--ob-color-border);
  padding-left: 1rem;
}

.ob-comment__more {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

/* Notifications */

.ob-notification {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--ob-color-border);
}

.ob-notification:last-child {
  border-bottom: none;
}

.ob-notification--unread {
  background: #eef3fd;
  margin: 0 -1.5rem;
  padding: 0.85rem 1.5rem;
}

.ob-notification__time {
  color: var(--ob-color-text-muted);
  font-size: 0.8rem;
}

.ob-pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

@media (max-width: 1023px) {
  .ob-shell--with-sidebars {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .ob-sidebar--right {
    display: none;
  }
}

@media (max-width: 767px) {
  .ob-sidebar-toggle {
    display: inline-flex;
  }

  .ob-shell--with-sidebars {
    display: block;
  }

  .ob-sidebar--left {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 84vw;
    max-width: 320px;
    background: var(--ob-color-bg);
    padding: 1rem;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 30;
  }

  .ob-sidebar--left.is-open {
    transform: translateX(0);
  }

  .ob-nav-toggle {
    display: inline-flex;
  }

  .ob-nav--icons {
    display: none;
    position: absolute;
    top: calc(100% + 0.6rem);
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    width: 200px;
    background: var(--ob-color-surface);
    border: 1px solid var(--ob-color-border);
    border-radius: var(--ob-radius);
    box-shadow: var(--ob-shadow);
    padding: 0.5rem;
    z-index: 30;
  }

  .ob-nav--icons.is-open {
    display: flex;
  }

  .ob-nav--icons .ob-icon-btn,
  .ob-nav--icons .ob-header__avatar-link {
    width: 100%;
    height: auto;
    border-radius: 8px;
    justify-content: flex-start;
    gap: 0.75rem;
    padding: 0.6rem 0.7rem;
  }

  .ob-nav--icons form {
    display: block;
  }

  .ob-nav--icons form .ob-icon-btn {
    width: 100%;
  }

  .ob-nav__label {
    display: inline;
    font-size: 0.9rem;
    font-weight: 500;
  }

  .ob-nav--icons .ob-badge-dot {
    position: static;
    margin-left: auto;
    border: none;
  }
}

@media (max-width: 640px) {
  .ob-hero h1 {
    font-size: 1.5rem;
  }
}