:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #dfe3e8;
    --color-text: #1f2933;
    --color-muted: #6b7280;
    --color-primary: #2f5d9e;
    --color-primary-contrast: #ffffff;
    --color-error-bg: #fdecea;
    --color-error-text: #8a1c1c;
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    line-height: 1.5;
}

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

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.nav-brand {
    font-weight: 600;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-links a {
    text-decoration: none;
}

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

/* Login */
.login {
    max-width: 360px;
    margin: 3rem auto 0;
    padding: 1.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.login h1 {
    margin-top: 0;
    font-size: 1.35rem;
}

.login form {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.login label {
    font-size: 0.9rem;
    color: var(--color-muted);
}

.login input {
    padding: 0.5rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
}

.login button {
    margin-top: 0.75rem;
    padding: 0.6rem;
    border: 0;
    border-radius: var(--radius);
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
    font-size: 1rem;
    cursor: pointer;
}

.login button:hover {
    background-color: #274d84;
}

/* Flash messages */
.flash {
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius);
    background-color: #e8f0fe;
}

.flash-error {
    background-color: var(--color-error-bg);
    color: var(--color-error-text);
}

/* Project list */
.project-list {
    list-style: none;
    margin: 1rem 0 0;
    padding: 0;
    display: grid;
    gap: 0.75rem;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.project-card {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.project-key {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-muted);
    letter-spacing: 0.03em;
}

.project-name {
    font-size: 1.1rem;
    font-weight: 600;
}

.project-role {
    font-size: 0.85rem;
    color: var(--color-muted);
}

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

/* Ticket detail skeleton */
.ticket-header {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.75rem;
    margin-bottom: 1rem;
}

.ticket-project {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.ticket-title {
    margin: 0.25rem 0 0.75rem;
}

.ticket-description {
    margin-bottom: 1.5rem;
    white-space: pre-line;
}

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

/* Tags (M5) */
.ticket-tags,
.ticket-links {
    margin: 1.5rem 0;
}

.tag-list,
.link-list {
    list-style: none;
    margin: 0 0 0.75rem;
    padding: 0;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag-chip {
    --tag-color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.15rem 0.6rem;
    border: 1px solid color-mix(in srgb, var(--tag-color) 45%, var(--color-border));
    border-radius: 999px;
    background-color: color-mix(in srgb, var(--tag-color) 12%, var(--color-surface));
    color: var(--color-text);
    font-size: 0.85rem;
}

.tag-chip .tag-remove {
    display: inline-flex;
}

.tag-remove button {
    border: 0;
    background: none;
    color: var(--color-muted);
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 0.15rem;
}

.tag-remove button:hover {
    color: var(--color-error-text);
}

.tag-add,
.link-add {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 0.5rem;
    padding: 0.75rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.tag-add label,
.link-add label {
    font-size: 0.85rem;
    color: var(--color-muted);
}

.tag-add input,
.link-add input,
.link-add select {
    padding: 0.4rem 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

/* Ticket links (M9) */
.link-group {
    margin-bottom: 0.75rem;
}

.link-group-label {
    margin: 0 0 0.35rem;
    font-size: 0.95rem;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--color-border);
}

.link-item .link-title {
    flex: 1;
}

.link-item .link-status {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.link-remove button {
    border: 0;
    background: none;
    color: var(--color-muted);
    cursor: pointer;
    text-decoration: underline;
}

/* Ticket list and search (M10) */
.list-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}

.result-count {
    color: var(--color-muted);
    font-size: 0.9rem;
}

.filter-form {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 0.75rem;
    margin: 1rem 0 1.5rem;
    padding: 0.75rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.filter-field {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.filter-field label {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.filter-field input,
.filter-field select {
    padding: 0.35rem 0.45rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.filter-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.filter-actions button {
    padding: 0.45rem 0.9rem;
    border: 0;
    border-radius: var(--radius);
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
    cursor: pointer;
}

.ticket-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-surface);
}

.ticket-table th,
.ticket-table td {
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}

.ticket-table .ticket-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.search-form {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0 1.5rem;
}

.search-form input {
    flex: 1;
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

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

.search-result {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.search-result .result-title {
    flex: 1;
}

.search-result .result-meta {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.pagination {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.pagination-info {
    color: var(--color-muted);
    font-size: 0.9rem;
}