/* Task 4: site layout and shared component classes.
   Owns the site-wide look. call.css (call room and call dialogs) is separate. */

/* ---------- Design tokens ---------- */

:root {
  /* Colours: light theme */
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #1b1f24;
  --color-muted: #4b5563;
  --color-border: #d8dce3;
  --color-input-border: #7a8494;
  --color-link: #1d4ed8;
  --color-focus: #1d4ed8;
  --color-primary: #1d4ed8;
  --color-primary-hover: #1e40af;
  --color-primary-text: #ffffff;
  --color-danger: #b91c1c;
  --color-danger-text: #ffffff;
  --color-error-text: #b91c1c;
  --color-success-text: #166534;
  --color-success-bg: #dcfce7;
  --color-warning-text: #92400e;
  --color-warning-bg: #fef3c7;
  --color-info-text: #1e3a8a;
  --color-info-bg: #dbeafe;
  --color-online: #15803d;
  --color-offline: #6b7280;
  --color-disabled-bg: #e5e7eb;
  --color-disabled-text: #6b7280;

  /* Spacing and shape */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --radius: 8px;
  --content-max: 760px;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1216;
    --color-surface: #181c22;
    --color-text: #e6e9ef;
    --color-muted: #a7b0bf;
    --color-border: #2e3541;
    --color-input-border: #6b7587;
    --color-link: #93c5fd;
    --color-focus: #93c5fd;
    --color-primary: #60a5fa;
    --color-primary-hover: #93c5fd;
    --color-primary-text: #0b1220;
    --color-danger: #f87171;
    --color-danger-text: #1a0505;
    --color-error-text: #fca5a5;
    --color-success-text: #86efac;
    --color-success-bg: #14321f;
    --color-warning-text: #fcd34d;
    --color-warning-bg: #3a2c0c;
    --color-info-text: #bfdbfe;
    --color-info-bg: #13243f;
    --color-online: #4ade80;
    --color-offline: #9ca3af;
    --color-disabled-bg: #2a303b;
    --color-disabled-text: #9ca3af;
  }
}

/* ---------- Base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0 0 var(--space-3);
}

h1,
.page-title {
  font-size: 1.5rem;
}

h2 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 var(--space-3);
}

a {
  color: var(--color-link);
}

img,
video,
canvas {
  max-width: 100%;
  height: auto;
}

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  z-index: 10;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-focus);
  border-radius: var(--radius);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-2);
}

/* ---------- Header and layout ---------- */

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
}

.site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
}

.nav-list a {
  color: var(--color-link);
  text-decoration: none;
  padding: var(--space-1) 0;
}

.nav-list a:hover {
  text-decoration: underline;
}

.nav-list a[aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.nav-user {
  color: var(--color-muted);
  overflow-wrap: anywhere;
}

.nav-list .inline-form {
  margin: 0;
}

main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-6);
  width: 100%;
}

/* Footer: pushed to the bottom of the window on short pages. */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

main {
  flex: 1 0 auto;
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.site-footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--color-link);
}

.site-footer a[aria-current="page"] {
  color: var(--color-muted);
}

main:focus {
  outline: none;
}

.muted {
  color: var(--color-muted);
}

/* ---------- Messages ---------- */

.messages {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
}

.messages li {
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-2);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-border);
  background: var(--color-surface);
}

.messages .success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border-left-color: var(--color-success-text);
}

.messages .error {
  color: var(--color-error-text);
  border-left-color: var(--color-danger);
}

.messages .warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border-left-color: var(--color-warning-text);
}

.messages .info {
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border-left-color: var(--color-info-text);
}

/* ---------- Cards and page pieces ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
}

.empty-state {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--color-muted);
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}

.badge {
  display: inline-block;
  min-width: 1.5em;
  padding: 0 0.4em;
  border-radius: 999px;
  background: var(--color-primary);
  color: var(--color-primary-text);
  font-size: 0.8em;
  font-weight: 700;
  line-height: 1.5em;
  text-align: center;
  vertical-align: middle;
}

/* ---------- Lists ---------- */

.list {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.list-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item > :first-child {
  flex: 1 1 12rem;
  min-width: 0;
  overflow-wrap: anywhere;
}

.list-item .actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  text-decoration: underline;
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}

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

.btn-danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: var(--color-danger-text);
}

.btn-quiet {
  background: transparent;
  border-color: transparent;
  color: var(--color-link);
  min-height: 2.25rem;
  padding: var(--space-1) var(--space-2);
}

/* Disabled buttons: grey, no pointer, no hover. Declared last so they win over the variants. */
.btn:disabled,
.btn[aria-disabled="true"] {
  background: var(--color-disabled-bg);
  border-color: var(--color-disabled-bg);
  color: var(--color-disabled-text);
  cursor: not-allowed;
  text-decoration: none;
}

/* A POST form that only shows its button inline. */
.inline-form {
  display: inline;
  margin: 0;
}

/* ---------- Presence marker ---------- */

.presence {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.presence::before {
  content: "";
  display: inline-block;
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: var(--color-offline);
}

.presence.is-online {
  color: var(--color-online);
}

.presence.is-online::before {
  background: var(--color-online);
}

/* ---------- Forms ---------- */

.form {
  margin: 0 0 var(--space-4);
}

.form-field {
  margin-bottom: var(--space-4);
}

.form label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.form input:not([type="checkbox"]):not([type="radio"]):not([type="submit"]):not([type="button"]),
.form select,
.form textarea,
.search-form input {
  display: block;
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
}

.form-check label {
  display: inline;
  font-weight: 400;
}

.form input[type="checkbox"],
.form input[type="radio"] {
  width: 1.1em;
  height: 1.1em;
  margin: 0 var(--space-2) 0 0;
  vertical-align: middle;
  accent-color: var(--color-primary);
}

.form input[aria-invalid="true"],
.form select[aria-invalid="true"],
.form textarea[aria-invalid="true"] {
  border-color: var(--color-danger);
  border-width: 2px;
}

.form ul,
.form .errorlist {
  list-style: none;
  margin: var(--space-1) 0 0;
  padding: 0;
}

.errorlist {
  color: var(--color-error-text);
  font-size: 0.95rem;
  font-weight: 600;
}

.form .helptext,
.form .help-text,
.form small {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-muted);
  font-size: 0.9rem;
}

.form button,
.form input[type="submit"] {
  margin-top: var(--space-2);
}

.search-form {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: stretch;
  margin-bottom: var(--space-4);
}

.search-form input {
  flex: 1 1 12rem;
  width: auto;
}

.search-form .btn {
  flex: 0 0 auto;
}

/* ---------- Pagination ---------- */

.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.pagination a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
}