/* ---- Design tokens ---- */
:root {
    --bg: #1a1a2e;
    --bg-elevated: #16213e;
    --bg-input: #1a1a2e;
    --border: #2a2a4a;
    --border-strong: #3a3a5a;
    --accent: #5865F2;
    --accent-hover: #4752c4;
    --accent-soft: rgba(88, 101, 242, 0.12);
    --text: #e0e0e0;
    --text-muted: #a0a0b0;
    --text-dim: #7a7a8a;
    --danger: #e74c3c;
    --danger-bg: #4a1a1a;
    --danger-border: #c0392b;
    --success: #2ecc71;
    --success-bg: #1a4a2a;
    --success-border: #27ae60;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.45);
}

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

html { color-scheme: dark; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ---- Layout ---- */
.container { max-width: 900px; margin: 40px auto; padding: 0 var(--space-6); }
.container-wide { max-width: 1100px; margin: 40px auto; padding: 0 var(--space-6); }

h1 { font-size: 1.6rem; color: #fff; }
h2 { font-size: 1.1rem; color: #c0c0d0; }
h3 { font-size: 1rem; color: #c0c0d0; }
p  { color: var(--text); }

.muted { color: var(--text-muted); }
.dim   { color: var(--text-dim); }
.hint  { font-size: 0.8rem; color: var(--text-dim); margin-top: var(--space-1); }

/* ---- Skip link (a11y) ---- */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--accent);
    color: #fff;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---- Focus ring ---- */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ---- Links ---- */
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    background: var(--accent);
    color: #fff;
    border: 1px solid transparent;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
    text-decoration: none;
    font-family: inherit;
}
.btn:hover:not(:disabled) { background: var(--accent-hover); }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-secondary {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-secondary:hover:not(:disabled) { background: var(--accent-soft); border-color: var(--accent); color: #fff; }

.btn-danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger-border);
}
.btn-danger:hover:not(:disabled) { background: var(--danger-border); color: #fff; }

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border-color: transparent;
    padding: 6px 10px;
}
.btn-ghost:hover:not(:disabled) { color: #fff; background: var(--accent-soft); }

.btn-sm { padding: 6px 12px; font-size: 0.85rem; }
.btn-icon { width: 34px; height: 34px; padding: 0; border-radius: 50%; }

.btn[aria-busy="true"] {
    pointer-events: none;
    position: relative;
    color: transparent !important;
}
.btn[aria-busy="true"]::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 16px; height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Forms ---- */
.form-group { margin-bottom: var(--space-5); }
.form-group-inline { display: flex; align-items: center; gap: var(--space-3); }

label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

input[type=text], input[type=url], input[type=number], input[type=search],
input[type=email], input[type=password], select, textarea {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
input[aria-invalid="true"], select[aria-invalid="true"] {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.12);
}
.field-error {
    display: block;
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: var(--space-1);
    min-height: 1em;
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--border-strong);
    border-radius: 3px;
    outline: none;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px; height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff2;
    transition: transform 0.1s;
}
input[type=range]::-moz-range-thumb {
    width: 18px; height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid #fff2;
}
input[type=range]:hover::-webkit-slider-thumb { transform: scale(1.12); }

/* ---- Segmented control (tabs) ---- */
.segmented {
    display: inline-flex;
    background: var(--bg-input);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 2px;
}
.segmented button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    font-family: inherit;
}
.segmented button:hover { color: var(--text); }
.segmented button[aria-pressed="true"] {
    background: var(--accent);
    color: #fff;
}

/* ---- Cards ---- */
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

/* ---- Alerts (inline, for server-rendered fallback) ---- */
.alert {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-5);
    font-size: 0.9rem;
    border: 1px solid;
}
.alert-error   { background: var(--danger-bg);  border-color: var(--danger-border);  color: var(--danger); }
.alert-success { background: var(--success-bg); border-color: var(--success-border); color: var(--success); }

/* ---- Toast stack ---- */
.toast-stack {
    position: fixed;
    right: 20px;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: 500;
    max-width: min(92vw, 380px);
}
.toast {
    background: var(--bg-elevated);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--text);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    box-shadow: var(--shadow-md);
    animation: toast-in 0.2s ease-out;
}
.toast.toast-success { border-left: 3px solid var(--success); }
.toast.toast-error   { border-left: 3px solid var(--danger); }
.toast.toast-info    { border-left: 3px solid var(--accent); }
.toast button.toast-action {
    background: transparent;
    border: 1px solid var(--border-strong);
    color: var(--text);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    margin-left: auto;
}
.toast button.toast-action:hover { border-color: var(--accent); color: #fff; }
.toast button.toast-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    padding: 0 4px;
}
.toast button.toast-close:hover { color: #fff; }
@keyframes toast-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- Modal ---- */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 20, 0.65);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 600;
    padding: var(--space-4);
    animation: fade-in 0.15s ease-out;
}
.modal {
    background: var(--bg-elevated);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    max-width: 440px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}
.modal h2 { margin-bottom: var(--space-3); color: #fff; }
.modal p  { color: var(--text-muted); margin-bottom: var(--space-5); }
.modal-actions { display: flex; justify-content: flex-end; gap: var(--space-3); }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

/* ---- Tables ---- */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); }
th {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
td { font-size: 0.95rem; }

/* ---- Utilities ---- */
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); }
.flex-gap-2 { display: flex; gap: var(--space-2); }
.flex-gap-3 { display: flex; gap: var(--space-3); }
.items-center { align-items: center; }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-8 { margin-bottom: var(--space-8); }
.sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .container, .container-wide { margin: 20px auto; padding: 0 var(--space-4); }
    h1 { font-size: 1.35rem; }
    .card { padding: var(--space-5); }
    .modal { padding: var(--space-5); }
    table thead { display: none; }
    table, tbody, tr, td { display: block; width: 100%; }
    tr { border: 1px solid var(--border); border-radius: var(--radius-md); padding: var(--space-3); margin-bottom: var(--space-3); }
    td { border: none; padding: 6px 0; }
    td::before {
        content: attr(data-label);
        display: block;
        color: var(--text-muted);
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        margin-bottom: 2px;
    }
}