/* ── Theme ── */
:root {
    --bg: #0f172a;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-faint: #64748b;
    --border: #1e293b;
    --surface: #1e293b;
    --surface-border: #334155;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger: #f87171;
    --danger-hover: #ef4444;
    --success: #34d399;
    --warning: #fbbf24;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f8fafc;
        --text: #1e293b;
        --text-muted: #64748b;
        --text-faint: #94a3b8;
        --border: #e2e8f0;
        --surface: #ffffff;
        --surface-border: #cbd5e1;
        --accent: #0284c7;
        --accent-hover: #0369a1;
        --danger: #ef4444;
        --danger-hover: #dc2626;
        --success: #16a34a;
        --warning: #d97706;
    }
}

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

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

/* ── Layout ── */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── Header ── */
header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.header-btn {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--surface-border);
    border-radius: 0.375rem;
    background: var(--surface);
    transition: border-color 0.15s, color 0.15s;
    cursor: pointer;
}

.header-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: opacity 0.15s, background 0.15s, border-color 0.15s, color 0.15s;
    font-family: inherit;
}

.btn:hover { opacity: 0.85; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: 0.85; }
.btn-secondary {
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--surface-border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger {
    background: var(--surface);
    color: var(--danger);
    border: 1px solid var(--surface-border);
}
.btn-danger:hover { border-color: var(--danger); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

button:disabled {
    opacity: 0.6;
    cursor: wait;
}

/* ── Common elements ── */
.back-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.875rem;
}

.back-link:hover {
    text-decoration: underline;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.page-header h1 {
    margin-bottom: 0;
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.toast-success {
    background: color-mix(in srgb, var(--success) 15%, transparent);
    color: var(--success);
    border: 1px solid var(--success);
}

.toast-error {
    background: color-mix(in srgb, var(--danger) 15%, transparent);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.empty-state {
    text-align: center;
    padding: 4rem 0;
    color: var(--text-faint);
}

.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page h2 {
    margin-bottom: 1rem;
}

/* ── Forms ── */
.form-group { margin-bottom: 1rem; }

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.form-input,
input[type="text"],
input[type="password"],
input[type="email"] {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--surface-border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-input:focus,
input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
    outline: none;
    border-color: var(--accent);
}

/* ── Utilities ── */
.text-muted { color: var(--text-muted); font-size: 0.875rem; }
.text-faint { color: var(--text-faint); font-size: 0.8rem; }
.text-accent { color: var(--accent); font-weight: 600; }
.text-danger { color: var(--danger); font-size: 0.85rem; }
.text-success { color: var(--success); font-size: 0.875rem; }

.validation-summary-errors ul {
    list-style: none;
    color: var(--danger);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}