/* ============================================
   Design System — Modern SaaS (Linear/Vercel)
   ============================================ */

/* --- Reset --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* --- Custom Properties --- */
[data-theme="light"] {
    --bg: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --border: #e5e7eb;
    --text: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-subtle: rgba(37, 99, 235, 0.08);
    --success: #059669;
    --success-bg: rgba(5, 150, 105, 0.1);
    --danger: #dc2626;
    --danger-bg: rgba(220, 38, 38, 0.1);
    --warning: #d97706;
    --warning-bg: rgba(217, 119, 6, 0.1);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1e1e1e;
    --border: #2e2e2e;
    --text: #f0f0f0;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666666;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-subtle: rgba(59, 130, 246, 0.12);
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.12);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.12);
    --warning: #fbbf24;
    --warning-bg: rgba(251, 191, 36, 0.12);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --focus-ring: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

/* --- Base --- */
html {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-size: 0.875rem;
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    color: var(--accent-hover);
}

/* --- Typography --- */
h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.025em;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

hgroup {
    margin-bottom: 1.25rem;
}

hgroup p {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

p {
    margin-bottom: 0.75rem;
}

small {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

/* --- Layout --- */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

main.container {
    padding-top: 2rem;
    padding-bottom: 3rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

/* --- Navigation --- */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 56px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
}

.nav-inner {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 1.5rem;
}

.nav-brand {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--text);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-link {
    display: block;
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: color 0.15s, background 0.15s;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--text);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--text);
    background: var(--bg-tertiary);
    font-weight: 600;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}

.nav-right small {
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Language toggle */
.lang-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.lang-toggle .lang-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    transition: background 0.15s, color 0.15s;
}

.lang-toggle .lang-btn:first-child {
    border-right: 1px solid var(--border);
}

.lang-toggle .lang-btn.active {
    background: var(--accent-subtle);
    color: var(--accent);
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
    color: var(--text);
    border-color: var(--text-tertiary);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
}

.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* Logout link in nav */
.nav-logout {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: color 0.15s, border-color 0.15s;
}

.nav-logout:hover {
    color: var(--text);
    border-color: var(--text-tertiary);
}

/* --- Cards --- */
.card {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    background: var(--bg);
}

.card-header {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

/* --- Tables --- */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

thead th {
    text-align: left;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--border);
}

tbody td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}

tbody tr:hover {
    background: var(--bg-secondary);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* --- Forms --- */
label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"],
select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-top: 0.25rem;
    margin-bottom: 1rem;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}

input:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: var(--focus-ring);
}

input[readonly] {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

input[type="checkbox"] {
    accent-color: var(--accent);
    margin-right: 0.5rem;
}

fieldset {
    border: none;
    padding: 0;
    margin-bottom: 1rem;
}

fieldset label {
    display: inline-flex;
    align-items: center;
    font-weight: 400;
}

form small {
    display: block;
    margin-top: -0.75rem;
    margin-bottom: 1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: inherit;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

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

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

.btn-outline:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-tertiary);
}

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

.btn-danger:hover {
    background: #b91c1c;
    border-color: #b91c1c;
    color: #fff;
}

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

.btn-outline.btn-danger:hover {
    background: var(--danger-bg);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

/* Default button (no class) */
button[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: inherit;
    border-radius: 6px;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    transition: background 0.15s;
}

button[type="submit"]:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: 9999px;
    line-height: 1.6;
}

.badge-success {
    background: var(--success-bg);
    color: var(--success);
}

.badge-danger {
    background: var(--danger-bg);
    color: var(--danger);
}

.badge-warning {
    background: var(--warning-bg);
    color: var(--warning);
}

/* --- Status --- */
.status-completed {
    color: var(--success);
    font-weight: 600;
}

.status-failed {
    color: var(--danger);
    font-weight: 600;
}

.status-running {
    color: var(--warning);
    font-weight: 600;
}

/* --- Change indicators --- */
.change-positive {
    color: var(--success);
    font-weight: 600;
}

.change-negative {
    color: var(--danger);
    font-weight: 600;
}

/* --- Login --- */
.login-card {
    max-width: 400px;
    margin: 100px auto;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
}

.login-card h2 {
    margin-bottom: 0.5rem;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* --- Utilities --- */
.text-danger {
    color: var(--danger);
}

.text-secondary {
    color: var(--text-secondary);
}

.inline-form {
    display: inline;
    margin: 0;
}

/* details/summary */
details {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
}

summary {
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--text);
    margin: -1rem -1.5rem;
    padding: 1rem 1.5rem;
    border-radius: 8px;
}

details[open] summary {
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-inner {
        flex-wrap: wrap;
        height: auto;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
    }

    .nav-links {
        order: 3;
        width: 100%;
        overflow-x: auto;
        gap: 0.125rem;
    }

    .nav-right {
        gap: 0.5rem;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    main.container {
        padding-top: 1.25rem;
    }

    table {
        display: block;
        overflow-x: auto;
    }
}