/* ============================================================
   COMMON — Variables, Reset, Typography
   Loaded on ALL devices before desktop.css / mobile.css
   ============================================================ */

/* ── Light theme (default) ──────────────────────────────────── */
:root {
    /* Brand */
    --clr-primary:        #2563eb;
    --clr-primary-hover:  #1d4ed8;
    --clr-primary-light:  #eff6ff;
    --clr-accent:         #0ea5e9;

    /* Sidebar — always dark in light mode */
    --clr-sidebar-bg:     #0f172a;
    --clr-sidebar-text:   #94a3b8;
    --clr-sidebar-active: #ffffff;
    --clr-sidebar-hover:  #1e293b;
    --clr-sidebar-border: #1e293b;
    --clr-sidebar-label:  #5a7899;

    /* Surface */
    --clr-bg:             #f1f5f9;
    --clr-surface:        #ffffff;
    --clr-surface-2:      #f8fafc;
    --clr-border:         #e2e8f0;

    /* Text */
    --clr-text:           #0f172a;
    --clr-text-muted:     #64748b;
    --clr-text-light:     #94a3b8;

    /* Status */
    --clr-success:        #10b981;
    --clr-warning:        #f59e0b;
    --clr-danger:         #ef4444;
    --clr-info:           #3b82f6;

    /* Status backgrounds */
    --clr-success-bg:     #ecfdf5;
    --clr-warning-bg:     #fffbeb;
    --clr-danger-bg:      #fef2f2;
    --clr-info-bg:        #eff6ff;

    /* Status text (varies per theme) */
    --clr-success-text:   #065f46;
    --clr-warning-text:   #92400e;
    --clr-danger-text:    #991b1b;
    --clr-info-text:      #1e40af;

    /* Focus ring */
    --clr-focus-ring:     rgba(37,99,235,.14);

    /* Radius */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-lg:   16px;
    --radius-full: 9999px;

    /* Shadow */
    --shadow-sm:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md:  0 4px 12px rgba(0,0,0,.08);
    --shadow-lg:  0 10px 30px rgba(0,0,0,.12);

    /* Typography */
    --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
    --font-mono:  'JetBrains Mono', monospace;

    /* Transitions */
    --transition: 150ms ease;
}

/* ── Dark theme ──────────────────────────────────────────────── */
[data-theme="dark"] {
    /* Brand — slightly brighter on dark background */
    --clr-primary:        #4f86f7;
    --clr-primary-hover:  #3b72f0;
    --clr-primary-light:  #1a2d50;
    --clr-accent:         #38bdf8;

    /* Sidebar — deeper than main bg to create separation */
    --clr-sidebar-bg:     #010409;
    --clr-sidebar-text:   #8b949e;
    --clr-sidebar-active: #e6edf3;
    --clr-sidebar-hover:  #161b22;
    --clr-sidebar-border: #21262d;
    --clr-sidebar-label:  #6b7d8d;

    /* Surface */
    --clr-bg:             #0d1117;
    --clr-surface:        #161b22;
    --clr-surface-2:      #1c2128;
    --clr-border:         #30363d;

    /* Text — high contrast on dark */
    --clr-text:           #e6edf3;
    --clr-text-muted:     #8b949e;
    --clr-text-light:     #484f58;

    /* Status backgrounds — dark tinted */
    --clr-success-bg:     #0a2d1a;
    --clr-warning-bg:     #2d1f00;
    --clr-danger-bg:      #2d0e0e;
    --clr-info-bg:        #0d1d35;

    /* Status text — bright enough on dark backgrounds */
    --clr-success-text:   #3fb950;
    --clr-warning-text:   #d29922;
    --clr-danger-text:    #f85149;
    --clr-info-text:      #58a6ff;

    /* Focus ring — brighter on dark */
    --clr-focus-ring:     rgba(79,134,247,.22);

    /* Shadows — stronger on dark */
    --shadow-sm:  0 1px 3px rgba(0,0,0,.4),  0 1px 2px rgba(0,0,0,.3);
    --shadow-md:  0 4px 12px rgba(0,0,0,.5);
    --shadow-lg:  0 10px 30px rgba(0,0,0,.7);
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-sans);
    color: var(--clr-text);
    background: var(--clr-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--clr-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { display: block; max-width: 100%; }

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ── Utility classes ───────────────────────────────────────────── */

.text-muted   { color: var(--clr-text-muted); }
.text-light   { color: var(--clr-text-light); }
.text-primary { color: var(--clr-primary); }
.text-success { color: var(--clr-success); }
.text-warning { color: var(--clr-warning); }
.text-danger  { color: var(--clr-danger); }

.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.fs-xs  { font-size: .75rem; }
.fs-sm  { font-size: .875rem; }
.fs-md  { font-size: 1rem; }
.fs-lg  { font-size: 1.125rem; }
.fs-xl  { font-size: 1.25rem; }
.fs-2xl { font-size: 1.5rem; }

.mt-auto { margin-top: auto; }
.mb-1 { margin-bottom: .25rem; }
.mb-2 { margin-bottom: .5rem; }
.mb-4 { margin-bottom: 1rem; }

.gap-1 { gap: .25rem; }
.gap-2 { gap: .5rem; }
.gap-3 { gap: .75rem; }
.gap-4 { gap: 1rem; }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ── Cards ──────────────────────────────────────────────────────── */

.card {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--clr-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body { padding: 1.5rem; }

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--clr-text);
}

/* ── Buttons ─────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .625rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    font-size: .875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    line-height: 1;
}

.btn-primary {
    background: var(--clr-primary);
    color: #fff;
    border-color: var(--clr-primary);
}
.btn-primary:hover {
    background: var(--clr-primary-hover);
    border-color: var(--clr-primary-hover);
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    color: var(--clr-primary);
    border-color: var(--clr-primary);
}
.btn-outline:hover {
    background: var(--clr-primary-light);
    text-decoration: none;
}

.btn-ghost {
    background: transparent;
    color: var(--clr-text-muted);
    border-color: transparent;
}
.btn-ghost:hover {
    background: var(--clr-surface-2);
    color: var(--clr-text);
    text-decoration: none;
}

.btn-danger {
    background: var(--clr-danger);
    color: #fff;
    border-color: var(--clr-danger);
}
.btn-danger:hover { opacity: .9; }

.btn-sm { padding: .4rem .875rem; font-size: .8125rem; }
.btn-lg { padding: .875rem 1.75rem; font-size: 1rem; }

/* ── Form controls ───────────────────────────────────────────────── */

.form-group { display: flex; flex-direction: column; gap: .375rem; }

.form-label {
    font-size: .8125rem;
    font-weight: 500;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.form-control {
    width: 100%;
    padding: .625rem .875rem;
    border: 1.5px solid var(--clr-border);
    border-radius: var(--radius-md);
    background: var(--clr-surface);
    color: var(--clr-text);
    font-size: .9375rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}
.form-control:focus {
    border-color: var(--clr-primary);
    box-shadow: 0 0 0 3px var(--clr-focus-ring);
}
.form-control::placeholder { color: var(--clr-text-light); }

.form-error {
    font-size: .8125rem;
    color: var(--clr-danger);
}

/* ── Badges ──────────────────────────────────────────────────────── */

.badge {
    display: inline-flex;
    align-items: center;
    padding: .2rem .625rem;
    border-radius: var(--radius-full);
    font-size: .75rem;
    font-weight: 600;
    line-height: 1;
}

.badge-success { background: var(--clr-success-bg); color: var(--clr-success-text); }
.badge-warning { background: var(--clr-warning-bg); color: var(--clr-warning-text); }
.badge-danger  { background: var(--clr-danger-bg);  color: var(--clr-danger-text); }
.badge-info    { background: var(--clr-info-bg);    color: var(--clr-info-text); }
.badge-neutral { background: var(--clr-surface-2);  color: var(--clr-text-muted); }
.badge-purple  { background: #f3e8ff; color: #7c3aed; }
.badge-accent  { background: #e0f2fe; color: #0369a1; }

[data-theme="dark"] .badge-purple { background: #2d1b4e; color: #c084fc; }
[data-theme="dark"] .badge-accent { background: #0c2233; color: #38bdf8; }

/* ── Alerts ──────────────────────────────────────────────────────── */

.alert {
    padding: .875rem 1.125rem;
    border-radius: var(--radius-md);
    font-size: .9rem;
    display: flex;
    align-items: flex-start;
    gap: .625rem;
}

.alert-danger  { background: var(--clr-danger-bg);  color: var(--clr-danger-text);  border-left: 4px solid var(--clr-danger); }
.alert-success { background: var(--clr-success-bg); color: var(--clr-success-text); border-left: 4px solid var(--clr-success); }
.alert-warning { background: var(--clr-warning-bg); color: var(--clr-warning-text); border-left: 4px solid var(--clr-warning); }
.alert-info    { background: var(--clr-info-bg);    color: var(--clr-info-text);    border-left: 4px solid var(--clr-info); }

/* ── Divider ─────────────────────────────────────────────────────── */

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

/* ── Avatar ──────────────────────────────────────────────────────── */

.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--clr-primary);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: .8125rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* ── Stat card ───────────────────────────────────────────────────── */

.stat-card {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .5rem;
    box-shadow: var(--shadow-sm);
}

.stat-label {
    font-size: .8125rem;
    font-weight: 500;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--clr-text);
    line-height: 1;
}

.stat-delta {
    font-size: .8125rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: .25rem;
}

.stat-delta.up   { color: var(--clr-success); }
.stat-delta.down { color: var(--clr-danger); }

/* ── Sidebar nav item ────────────────────────────────────────────── */

.nav-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .625rem 1rem;
    border-radius: var(--radius-md);
    color: var(--clr-sidebar-text);
    font-size: .875rem;
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
}

.nav-item:hover {
    background: var(--clr-sidebar-hover);
    color: var(--clr-sidebar-active);
    text-decoration: none;
}

.nav-item.active {
    background: var(--clr-primary);
    color: #fff;
}

.nav-item .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: .75;
}

.nav-item.active .nav-icon,
.nav-item:hover .nav-icon { opacity: 1; }

.nav-section-label {
    font-size: .6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--clr-sidebar-label);
    padding: 1rem 1rem .375rem;
}

/* ── Collapsible nav group ───────────────────────────────────────── */

.nav-group-toggle {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    justify-content: flex-start;
}

.nav-chevron {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    margin-left: auto;
    opacity: .5;
    transition: transform var(--transition);
}

.nav-group-items {
    display: none;
    padding-left: .625rem;
    margin-top: .125rem;
}

.nav-group.nav-group-open .nav-chevron { transform: rotate(180deg); }
.nav-group.nav-group-open .nav-group-items { display: block; }

.nav-sub-item {
    font-size: .8125rem;
    padding: .5rem .875rem;
    gap: .6rem;
}

.nav-icon-sm {
    width: 15px;
    height: 15px;
    flex-shrink: 0;
    opacity: .7;
}

.nav-sub-item.active .nav-icon-sm,
.nav-sub-item:hover .nav-icon-sm { opacity: 1; }

/* ── Theme toggle button ─────────────────────────────────────────── */

#themeToggle svg { display: none; }
#themeToggle svg.theme-icon-active { display: block; }