/* -------------------------------------------------------------------------
 * TUM SafeSignal – stylesheet aligned with typo3.tum.de / TUM CD 2024+.
 *
 * Palette taken from typo3.tum.de's main.css:
 *   Primary (TUM Blue)   #3070B3   bs-primary, links & primary buttons
 *   Primary Hover        #295F98
 *   Secondary (Navy)     #072140   bs-secondary, masthead, siteorg
 *   Topbar               #0A2D57
 *   Navy subtle          #0E396E
 *   Hover-on-dark        #C2D7EF   light blue tint on navy background
 *   Soft card bg         #F0F5FA
 *   Muted border         #D6E2F0
 *   Body text            #212529
 *   Grey bg              #F8F9FA
 * -----------------------------------------------------------------------*/

:root {
    --tum-primary:        #3070B3;
    --tum-primary-hover:  #295F98;
    --tum-primary-active: #265A8F;
    --tum-secondary:      #072140;
    --tum-navy-1:         #0A2D57;
    --tum-navy-2:         #0E396E;
    --tum-hover-tint:     #C2D7EF;
    --tum-soft:           #F0F5FA;
    --tum-border-soft:    #D6E2F0;
    --tum-border:         #DEE2E6;
    --tum-bg:             #F8F9FA;
    --tum-muted:          #6C757D;
    --tum-text:           #212529;
    --tum-text-heading:   #072140;

    --tum-red:            #DC3545;
    --tum-green:          #198754;
    --tum-yellow:         #FFC107;

    --radius-sm: 4px;
    --radius:    4px;
    --radius-lg: 6px;

    --shadow-xs: 0 1px 2px rgba(7, 33, 64, 0.04);
    --shadow-sm: 0 2px 4px rgba(7, 33, 64, 0.06);
    --shadow:    0 4px 12px rgba(7, 33, 64, 0.08);

    --container-max: 1320px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: #fff;
    color: var(--tum-text);
    font-family: "Helvetica Neue", Helvetica, Arial, "Segoe UI",
        "Source Sans 3", -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main { flex: 1 0 auto; }

a {
    color: var(--tum-primary);
    text-decoration: underline;
    text-decoration-color: var(--tum-primary);
    text-underline-offset: 0.2em;
    text-decoration-thickness: 1px;
    transition: color 0.15s ease;
}
a:hover, a:focus {
    color: var(--tum-primary-hover);
    text-decoration-color: var(--tum-primary-hover);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--tum-text-heading);
    line-height: 1.2;
    margin: 0 0 0.5em;
}
h1 { font-size: clamp(1.75rem, 1.4rem + 1.4vw, 2.3rem); }
h2 { font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.6rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; font-weight: 600; }

p  { margin: 0 0 1em; }
small { color: var(--tum-muted); }

hr {
    border: 0;
    border-top: 1px solid var(--tum-border);
    margin: 2rem 0;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ---------- Top utility bar ---------- */

.topbar {
    background: var(--tum-navy-1);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 500;
}
.topbar a { color: #fff; text-decoration: none; }
.topbar a:hover, .topbar a:focus {
    color: var(--tum-hover-tint);
    text-decoration: none;
}
.topbar .container {
    display: flex;
    align-items: center;
    min-height: 40px;
    justify-content: space-between;
    gap: 1rem;
}
.topbar .left, .topbar .right {
    display: flex; align-items: center; gap: 1.25rem;
}
.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}
.lang-switch abbr { text-decoration: none; }
.lang-switch .active { font-weight: 700; }
.lang-switch .sep { opacity: 0.4; padding: 0 0.15rem; }

/* ---------- Navy masthead (c-siteorg pattern) ---------- */

.masthead {
    background: var(--tum-secondary);
    color: #fff;
    padding: clamp(1.25rem, 2.5vw, 2.5rem) 0;
    position: relative;
}
.masthead a { color: #fff; text-decoration: none; }
.masthead a:hover, .masthead a:focus { color: var(--tum-hover-tint); }
.masthead .container {
    display: grid;
    grid-template-columns: 1fr max-content;
    gap: 1.5rem;
    align-items: center;
}
.brand {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
    gap: 0.1rem;
}
.brand .app-eyebrow {
    display: block;
    font-size: 0.83rem;
    font-weight: 500;
    color: var(--tum-hover-tint);
    letter-spacing: 0.02em;
    margin-bottom: 0.25rem;
}
.brand .app-name {
    font-size: clamp(1.3rem, 1rem + 1.2vw, 1.75rem);
    font-weight: 700;
    color: #fff;
    margin: 0;
}
.brand .app-subtitle {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    margin-top: 0.15rem;
}
.masthead .tum-logo {
    display: block;
    width: clamp(56px, 6vw, 80px);
    justify-self: end;
}
.masthead .tum-logo svg { width: 100%; height: auto; display: block; }

/* ---------- Page intro (soft blue band below the masthead) ---------- */

.page-intro {
    background: var(--tum-soft);
    border-bottom: 1px solid var(--tum-border-soft);
    padding: clamp(1.25rem, 2.5vw, 2rem) 0;
}
.page-intro h1 { margin: 0 0 0.25em; }
.page-intro p  {
    margin: 0;
    max-width: 70ch;
    color: var(--tum-text);
    /* German compounds ("zuständigen Stellen", "TUM-Systemen") can land
       awkward break points at narrow widths. Allow automatic hyphenation
       as a fallback, and prefer breaking between words first. */
    hyphens: auto;
    -webkit-hyphens: auto;
    overflow-wrap: break-word;
}

.crumb {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.9rem;
    color: var(--tum-muted);
    text-decoration: none;
}
.crumb::before { content: "← "; }
.crumb:hover { color: var(--tum-primary); text-decoration: underline; }

/* ---------- Cards ---------- */

.card {
    background: #fff;
    border: 1px solid var(--tum-border-soft);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    margin-bottom: 1rem;
}
.card:hover {
    border-color: var(--tum-primary);
    box-shadow: var(--shadow-sm);
}
.card-soft {
    background: var(--tum-soft);
    border-color: var(--tum-border-soft);
}
.card-important {
    background: var(--tum-secondary);
    color: #fff;
    border: 0;
}
.card-important h1, .card-important h2, .card-important h3 { color: #fff; }
.card-important a { color: var(--tum-hover-tint); }

.topic-card {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.25rem;
    flex-wrap: wrap;
    border-left: 4px solid var(--tum-primary);
    cursor: pointer;
    transition: border-left-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.topic-card:hover {
    border-left-color: var(--tum-secondary);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}
.topic-card:focus-within {
    outline: 2px solid var(--tum-primary);
    outline-offset: 2px;
}
.topic-card .topic-body { flex: 1 1 65%; min-width: 0; }
.topic-card h3 {
    margin: 0 0 0.35rem;
    font-size: 1.2rem;
    font-weight: 700;
}
.topic-card h3 a {
    color: var(--tum-text-heading);
    text-decoration: none;
}
.topic-card h3 a::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
}
.topic-card:hover h3 a {
    color: var(--tum-primary);
}
.topic-card p { margin: 0; color: var(--tum-text); }
.topic-card .actions {
    position: relative;
    z-index: 2;
    display: flex; gap: 0.5rem; flex-wrap: wrap; flex-shrink: 0;
}

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

label {
    display: block;
    font-weight: 600;
    color: var(--tum-text-heading);
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}
label > span { display: inline-block; margin-bottom: 0.35rem; }
label .desc, .desc {
    display: block;
    font-weight: 400;
    color: var(--tum-muted);
    font-size: 0.88rem;
    margin-top: 0.3rem;
    line-height: 1.45;
}
.field-error {
    display: block;
    margin-top: 0.35rem;
    color: var(--tum-red);
    font-size: 0.88rem;
    line-height: 1.45;
}
.file-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    margin-top: 0.5rem;
    padding: 0.4rem 0.6rem;
    background: var(--tum-bg-soft, #f5f5f7);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
}
.file-preview-row { color: var(--tum-muted); }
.form-group:has(.field-error) input,
.form-group:has(.field-error) textarea,
.form-group:has(.field-error) select {
    border-color: var(--tum-red);
}

input[type="text"], input[type="email"], input[type="date"],
input[type="number"], input[type="password"], input[type="url"],
textarea, select {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--tum-border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--tum-text);
    font-size: 1rem;
    font-family: inherit;
    line-height: 1.5;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
textarea { min-height: 140px; resize: vertical; }
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--tum-primary);
    box-shadow: 0 0 0 3px rgba(48, 112, 179, 0.25);
}
input[type="file"] {
    padding: 0.5rem;
    background: var(--tum-bg);
    border: 1px dashed var(--tum-border);
    border-radius: var(--radius-sm);
    width: 100%;
    cursor: pointer;
}
input[type="file"]:hover {
    border-color: var(--tum-primary);
    background: var(--tum-soft);
}
input[type="checkbox"] {
    width: 1.1rem; height: 1.1rem;
    accent-color: var(--tum-primary);
    margin-right: 0.4rem;
    vertical-align: middle;
}
.form-group { margin-bottom: 1.5rem; }

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

.button, input[type="submit"], button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background: var(--tum-primary);
    color: #fff;
    border: 1px solid var(--tum-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.5;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, border-color 0.15s ease,
                color 0.15s ease, box-shadow 0.15s ease;
    font-family: inherit;
}
.button:hover, input[type="submit"]:hover, button:hover {
    background: var(--tum-primary-hover);
    border-color: var(--tum-primary-hover);
    color: #fff;
    text-decoration: none;
}
.button:active, input[type="submit"]:active, button:active {
    background: var(--tum-primary-active);
    border-color: var(--tum-primary-active);
}
.button:focus-visible,
input[type="submit"]:focus-visible,
button:focus-visible {
    outline: 0;
    box-shadow: 0 0 0 3px rgba(48, 112, 179, 0.35);
}
.button-small { padding: 0.35rem 0.75rem; font-size: 0.88rem; }

.button-ghost, .button-outline {
    background: transparent;
    color: var(--tum-primary);
    border: 1px solid var(--tum-primary);
}
.button-ghost:hover, .button-outline:hover {
    background: var(--tum-primary);
    color: #fff;
}

.button-secondary {
    background: var(--tum-secondary);
    border-color: var(--tum-secondary);
}
.button-secondary:hover { background: #051731; border-color: #051731; }

.button-danger {
    background: var(--tum-red);
    border-color: var(--tum-red);
}
.button-danger:hover { background: #bb2d3b; border-color: #bb2d3b; }

.button-success {
    background: var(--tum-green);
    border-color: var(--tum-green);
}
.button-success:hover { background: #146c43; border-color: #146c43; }

/* ---------- Alerts ---------- */

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-weight: 500;
    border-left: 4px solid var(--tum-primary);
    background: var(--tum-soft);
    color: var(--tum-text-heading);
}
.alert-success {
    border-left-color: var(--tum-green);
    background: #d1e7dd;
    color: #0a3622;
}
.alert-warning {
    border-left-color: var(--tum-yellow);
    background: #fff3cd;
    color: #664d03;
}
.alert-error {
    border-left-color: var(--tum-red);
    background: #f8d7da;
    color: #58151c;
}
.alert-info {
    border-left-color: var(--tum-primary);
    background: var(--tum-soft);
    color: var(--tum-text-heading);
}

/* ---------- Tables ---------- */

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border: 1px solid var(--tum-border-soft);
    border-radius: var(--radius);
    /* No `overflow: hidden` here: it would clip popouts (status menu,
       tooltips) anchored inside cells. Rounded corners stay because we
       round the first/last row backgrounds individually below. */
}
table thead th:first-child { border-top-left-radius: var(--radius); }
table thead th:last-child  { border-top-right-radius: var(--radius); }
table tbody tr:last-child td:first-child { border-bottom-left-radius: var(--radius); }
table tbody tr:last-child td:last-child  { border-bottom-right-radius: var(--radius); }
thead { background: var(--tum-secondary); color: #fff; }
th { font-weight: 600; font-size: 0.9rem; letter-spacing: 0.01em; }
th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--tum-border-soft);
    vertical-align: middle;
}
tbody tr { transition: background 0.1s ease; }
tbody tr:hover { background: var(--tum-soft); }
tbody tr:last-child td { border-bottom: 0; }

/* ---------- Status pill ---------- */

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--tum-bg);
    color: var(--tum-muted);
}
.status-pill::before {
    content: "";
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: currentColor;
}
.status-pill.open { color: var(--tum-red); background: #f8d7da; }
.status-pill.done { color: var(--tum-green); background: #d1e7dd; }
.status-pill.spam { color: var(--tum-muted); background: var(--tum-bg); }

.unread-badge {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.05rem 0.45rem;
    background: var(--tum-primary);
    color: #fff;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.4;
}

/* Sticky action bar shown when one or more reports are selected. */
.bulk-bar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.9rem;
    margin-bottom: 0.75rem;
    background: var(--tum-soft);
    border: 1px solid var(--tum-border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-xs);
}
.bulk-bar[hidden] { display: none; }
.bulk-bar-count { font-weight: 600; }
.bulk-bar-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.topic-chip {
    display: inline-block;
    margin: 0.1rem 0.2rem 0.1rem 0;
    padding: 0.1rem 0.55rem;
    background: var(--tum-soft);
    border-radius: 999px;
    font-size: 0.8rem;
}

.form-inline {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}
.form-inline .form-group { margin-bottom: 0; }

/* Grid of topic-access checkboxes used on the /users add + edit forms.
   Inline-flex wrapping (the original layout) re-flowed each row based on
   the longest label in that row, so columns drifted; a CSS grid with a
   minmax track keeps columns aligned across rows. The container is
   height-bounded and scrollable so a large topic catalogue can't push
   the rest of the form off-screen. */
.topic-checkbox-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
    gap: 0.2rem 1rem;
    max-height: 16rem;
    overflow-y: auto;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--tum-border-soft);
    border-radius: var(--radius-sm);
    background: #fff;
}
.topic-checkbox-list label {
    display: flex;
    gap: 0.45rem;
    align-items: center;
    margin: 0;
    padding: 0.2rem 0;
    font-weight: 400;
    cursor: pointer;
}
.topic-checkbox-list input[type="checkbox"] { margin: 0; }

/* Status pill rendered as a clickable <summary> in the reports table.
   Native triangle is hidden; clicking the pill reveals inline action
   buttons that post to the existing setStatus endpoint. */
.status-menu { position: relative; display: inline-block; }
.status-menu > summary {
    list-style: none;
    cursor: pointer;
}
.status-menu > summary::-webkit-details-marker { display: none; }
.status-menu > summary::after {
    content: "▾";
    font-size: 0.7rem;
    margin-left: 0.25rem;
    opacity: 0.6;
}
.status-menu-options {
    position: absolute;
    top: calc(100% + 0.3rem);
    right: 0;
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    padding: 0.45rem;
    background: #fff;
    border: 1px solid var(--tum-border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-xs);
    min-width: 9rem;
}
.status-menu-options button {
    text-align: left;
    padding: 0.35rem 0.6rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: transparent;
    cursor: pointer;
    font: inherit;
    color: inherit;
}
.status-menu-options button:hover { background: var(--tum-bg); }

/* ---------- Report thread ---------- */

.thread {
    display: flex; flex-direction: column; gap: 0.85rem; margin: 1.5rem 0;
}
.bubble {
    background: #fff;
    border: 1px solid var(--tum-border-soft);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-xs);
    max-width: 85%;
    word-wrap: break-word;
}
.bubble .bubble-meta {
    font-size: 0.8rem; color: var(--tum-muted);
    margin-bottom: 0.4rem; font-weight: 500;
}
.bubble .message-body :last-child { margin-bottom: 0; }
.bubble-theirs {
    align-self: flex-start;
    border-left: 4px solid var(--tum-muted);
}
.bubble-mine {
    align-self: flex-end;
    border-right: 4px solid var(--tum-primary);
    background: var(--tum-soft);
}

/* ---------- Section header ---------- */

.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin: 0 0 1.25rem;
    gap: 1rem;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--tum-border-soft);
    padding-bottom: 0.5rem;
}
.section-header h1, .section-header h2 { margin: 0; }

/* ---------- Footer ---------- */

.site-footer {
    margin-top: 3rem;
    background: var(--tum-secondary);
    color: rgba(255, 255, 255, 0.82);
    font-size: 0.9rem;
    padding: 1.75rem 0 2rem;
}
.site-footer .container {
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}
.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover {
    color: var(--tum-hover-tint);
    text-decoration: underline;
}
.site-footer .footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.site-footer .footer-meta {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.85rem;
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.site-footer .footer-thanks a { color: rgba(255, 255, 255, 0.85); }

/* ---------- Utility ---------- */

.muted { color: var(--tum-muted); }
.text-right { text-align: right; }
.text-center { text-align: center; }

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.stack > * + * { margin-top: 0.85rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.info article { max-width: 70ch; }
.info h1, .info h2, .info h3 { margin-top: 1.5em; }
.info h1:first-child, .info h2:first-child { margin-top: 0; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    padding: 0.75rem 1rem;
    background: var(--tum-yellow);
    color: var(--tum-text-heading);
    font-weight: 700;
    z-index: 9999;
    text-decoration: none;
}
.skip-link:focus {
    left: 1rem;
    top: 0.5rem;
    text-decoration: none;
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
    .masthead .container { grid-template-columns: 1fr; }
    .masthead .tum-logo { justify-self: start; width: 48px; }
    .topic-card { flex-direction: column; align-items: stretch; }
    .topic-card .actions { justify-content: flex-start; }
    .bubble { max-width: 100%; }
    th, td { padding: 0.55rem 0.65rem; font-size: 0.88rem; }
    .site-footer .container { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .topbar .container { flex-wrap: wrap; }
    .topbar .left { flex-wrap: wrap; gap: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}