/* Sentinel Dashboard – design system (light theme) */
:root {
  /* Colors */
  --bg: #f6f8fa;
  --surface: #ffffff;
  --surface-hover: #eaeef2;
  --border: #d0d7de;
  --text: #1f2328;
  --text-muted: #656d76;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --success: #1a7f37;
  --success-bg: rgba(26, 127, 55, 0.12);
  --error: #cf222e;
  --error-bg: rgba(207, 34, 46, 0.12);

  /* Spacing (0.25rem scale) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;

  /* Typography */
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --leading-tight: 1.25;
  --leading-normal: 1.5;

  /* Radius & shadow */
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);

  /* Breakpoints (for reference; use in media queries) */
  --bp-tablet: 992px;
  --bp-mobile: 768px;
  --bp-sm: 480px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
}

/* Auto-lock overlay: blur app when locked, show overlay */
.app {
  min-height: 100vh;
}
body.locked .app {
  filter: blur(4px);
  pointer-events: none;
}
.lock-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
}
body.locked .lock-overlay {
  display: flex;
}
.lock-overlay__card {
  max-width: 24rem;
  margin: var(--space-4);
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Nav */
.nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) 0;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav-logo {
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--text);
}
.nav-logo:hover {
  text-decoration: none;
  color: var(--text);
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}
.nav-link:hover {
  background: var(--surface-hover);
  text-decoration: none;
}
.nav-link--active {
  background: var(--surface-hover);
  color: var(--text);
  font-weight: 500;
}
.nav-link--active:hover {
  color: var(--text);
}

/* Container & layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.page-header {
  margin-bottom: var(--space-6);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.02em;
}

.page-subtitle {
  color: var(--text-muted);
  margin: 0;
  font-size: var(--text-base);
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.link-list__link {
  display: inline-block;
  padding: var(--space-2) 0;
  font-size: var(--text-base);
}

.auth-form {
  margin-bottom: var(--space-4);
}
.auth-swap {
  margin-top: var(--space-4);
  color: var(--text-muted);
  font-size: var(--text-sm);
}

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

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}

.card__body {
  margin: 0;
}

.card__description {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin: 0 0 var(--space-4);
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border: none;
}
.btn--primary:hover {
  background: var(--accent-hover);
  color: #fff;
  text-decoration: none;
}

.btn--secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn--secondary:hover {
  background: var(--surface-hover);
  text-decoration: none;
  color: var(--text);
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.form-field__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--text);
}

.form-field__input {
  display: block;
  width: 100%;
  max-width: 28rem;
  height: 2.5rem;
  padding: 0 var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.form-field__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.25);
}
.form-field__input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.25);
}
.form-field__input--error {
  border-color: var(--error);
}
.form-field__error {
  display: block;
  font-size: var(--text-sm);
  color: var(--error);
  margin-top: var(--space-1);
}

/* Table */
.table-wrap {
  overflow-x: auto;
  margin: var(--space-4) 0;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table__caption {
  text-align: left;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.table__head {
  background: var(--surface);
  border-bottom: 2px solid var(--border);
}

.table__th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--text);
}

.table__body .table__row:hover {
  background: var(--surface-hover);
}

.table__td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
}

/* Alert */
.alert {
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.alert--success {
  background: var(--success-bg);
  border: 1px solid var(--success);
  color: var(--success);
}

.alert--error {
  background: var(--error-bg);
  border: 1px solid var(--error);
  color: var(--error);
}

.alert--info {
  background: rgba(88, 166, 255, 0.15);
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* Mail */
.search-form {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-4);
}
.search-form-page-note {
  margin-bottom: var(--space-4);
  color: var(--text-muted, var(--text));
}
.mail-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: flex-end;
  margin-bottom: var(--space-4);
}
.mail-filters .form-field {
  margin-bottom: 0;
}
.mail-filters .form-field__input {
  max-width: 12rem;
}

/* Mail client: 3-column layout (sidebar | list | content) */
.mail-client-main {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 60px);
  max-width: none;
  margin: 0;
  padding: 0;
}
.mail-client {
  display: grid;
  grid-template-columns: 200px 1fr 1.2fr;
  grid-template-rows: 1fr;
  min-height: calc(100vh - 60px);
  flex: 1;
}
.mail-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.mail-sidebar__search {
  flex-shrink: 0;
}
.mail-sidebar__search-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.mail-sidebar__search-form .form-field__input,
.mail-sidebar__search-form .search-input {
  width: 100%;
}
.mail-sidebar__folders {
  flex: 1;
  min-height: 0;
}
.mail-folder-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.mail-folder-list li {
  margin: 0;
  padding: 0;
}
.mail-folder-list__item {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: background 0.15s;
}
.mail-folder-list__item:hover {
  background: var(--surface-hover);
  color: var(--text);
  text-decoration: none;
}
.mail-folder-list__item--active {
  background: var(--accent);
  color: #fff;
  font-weight: 500;
}
.mail-folder-list__row {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
}
.mail-folder-list__count {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: 400;
}
.mail-folder-list__item--active .mail-folder-list__count {
  color: rgba(255, 255, 255, 0.85);
}
.mail-list-panel {
  border-right: 1px solid var(--border);
  padding: var(--space-4);
  overflow: auto;
  min-width: 0;
}
.mail-list-placeholder,
.mail-content-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: var(--text-lg);
}
.mail-content-panel {
  padding: var(--space-6);
  overflow: hidden;
  min-width: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.mail-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.mail-content__subject {
  font-size: var(--text-xl);
  font-weight: 600;
  margin: 0 0 var(--space-4);
  line-height: var(--leading-tight);
}
.mail-content__meta {
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.mail-content__meta p {
  margin: 0 0 var(--space-1);
}
.message-list-link {
  color: var(--accent);
  text-decoration: none;
}
.message-list-link:hover {
  text-decoration: underline;
}
.search-input {
  max-width: 20rem;
}

.folder-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.folder-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border);
}
.folder-list li:last-child {
  border-bottom: none;
}

.pagination {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.message-read-note {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin: 0 0 var(--space-4);
}

.message-attachments {
  margin-bottom: var(--space-4);
}
.message-attachments .card__title {
  margin-bottom: var(--space-2);
}
.attachment-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.attachment-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border);
}
.attachment-list li:last-child {
  border-bottom: none;
}
.attachment-size {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin-left: var(--space-1);
}
.attachment-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}
.attachment-name {
  font-weight: 500;
}
.attachment-actions {
  margin-left: auto;
  display: flex;
  gap: var(--space-2);
}
.btn--sm {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
}

.message-body {
  margin-top: var(--space-4);
  padding: 0;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
.message-body-iframe {
  flex: 1;
  min-height: 300px;
  width: 100%;
  border: none;
  border-radius: var(--radius);
  display: block;
}
/* In flex context (mail client), allow iframe to shrink and fill */
.mail-content .message-body-iframe {
  min-height: 0;
}

.table__td--right {
  text-align: right;
}

/* Clickable message rows: entire row is a link */
.table__row--clickable {
  cursor: pointer;
}
.table__row--clickable:hover {
  background: var(--surface-hover);
}
.table__cell-link {
  display: block;
  color: inherit;
  text-decoration: none;
  margin: calc(-1 * var(--space-2)) calc(-1 * var(--space-3));
  padding: var(--space-2) var(--space-3);
}
.table__cell-link:hover {
  color: inherit;
  text-decoration: none;
}
.table__cell-link.message-list-link {
  color: var(--accent);
}
.table__cell-link.message-list-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ========== Responsive ========== */

/* Tablet and below: mail client stacks; nav and forms adapt */
@media (max-width: 992px) {
  .mail-client {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    min-height: 0;
  }
  .mail-client-main {
    min-height: 0;
  }
  .mail-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: var(--space-3);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
  }
  .mail-sidebar__folders {
    flex: 1 1 100%;
    min-height: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .mail-folder-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
  }
  .mail-folder-list__row {
    display: inline-flex;
  }
  .mail-list-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
    min-height: 200px;
    max-height: 40vh;
  }
  .mail-content-panel {
    min-height: 300px;
    flex: 1;
  }
  .mail-list-placeholder,
  .mail-content-placeholder {
    min-height: 120px;
  }
}

@media (max-width: 768px) {
  .nav {
    padding: var(--space-3) 0;
  }
  .nav-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 0 var(--space-4);
    gap: var(--space-3);
  }
  .nav-links {
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  .nav-link {
    padding: var(--space-2) var(--space-3);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .container {
    padding: var(--space-4) var(--space-4);
  }
  .page-title {
    font-size: var(--text-xl);
  }
  .search-form {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }
  .search-input {
    max-width: none;
  }
  .mail-filters {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }
  .mail-filters .form-field__input {
    max-width: none;
  }
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-left: calc(-1 * var(--space-4));
    margin-right: calc(-1 * var(--space-4));
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  .table {
    font-size: var(--text-sm);
    min-width: 400px;
  }
  .table__th,
  .table__td {
    padding: var(--space-2) var(--space-2);
  }
  .card {
    padding: var(--space-4);
  }
  .card__title {
    font-size: var(--text-lg);
  }
  .btn {
    min-height: 44px;
    padding: var(--space-2) var(--space-4);
  }
  .search-form .btn,
  .mail-filters .btn {
    width: 100%;
    justify-content: center;
  }
  .mail-sidebar .btn {
    width: auto;
    min-width: 120px;
  }
  .pagination {
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  .pagination .btn {
    flex: 1;
    min-width: 100px;
    justify-content: center;
  }
  .mail-content__subject {
    font-size: var(--text-lg);
  }
  .message-body-iframe {
    min-height: 300px;
  }
  .attachment-row {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .attachment-actions {
    margin-left: 0;
  }
}

/* Small phones */
@media (max-width: 480px) {
  .nav-inner {
    padding: 0 var(--space-3);
  }
  .container {
    padding: var(--space-3);
  }
  .page-title {
    font-size: var(--text-lg);
  }
  .mail-client .mail-list-panel,
  .mail-client .mail-content-panel {
    padding: var(--space-3);
  }
  .mail-folder-list__item {
    padding: var(--space-2);
    font-size: var(--text-sm);
  }
  .table {
    min-width: 320px;
    font-size: 0.8125rem;
  }
  .form-field__input {
    font-size: 16px; /* prevents zoom on focus in iOS */
  }
}