/* ============================================================================
   POS System — Core Design System
   Token-driven styles layered on top of Tailwind's utility classes.
   ============================================================================ */

:root {
    /* Brand palette */
    --color-primary: #2454FF;
    --color-primary-dark: #1638C4;
    --color-emerald: #10B981;
    --color-amber: #F5A623;
    --color-danger: #EF4444;

    /* Light mode surfaces */
    --bg-app: #F7F8FA;
    --bg-surface: #FFFFFF;
    --bg-surface-alt: #F1F3F7;
    --text-primary: #0F172A;
    --text-secondary: #5B647A;
    --border-subtle: #E6E9F0;

    --shadow-soft: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
    --shadow-lifted: 0 4px 12px rgba(15, 23, 42, 0.06), 0 16px 40px rgba(15, 23, 42, 0.10);

    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
}

.dark {
    --bg-app: #0B0F19;
    --bg-surface: #131826;
    --bg-surface-alt: #1B2233;
    --text-primary: #E7EAF2;
    --text-secondary: #8A93A8;
    --border-subtle: #232B3D;

    --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lifted: 0 4px 16px rgba(0, 0, 0, 0.35), 0 24px 48px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
    background: var(--bg-app);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    transition: background-color 0.25s ease, color 0.25s ease;
    max-width: 100%;
    overflow-x: hidden;
}

img, svg, video {
    max-width: 100%;
    height: auto;
}

h1, h2, h3, h4, .font-display {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    letter-spacing: -0.02em;
}

.font-mono-fig {
    font-family: 'JetBrains Mono', ui-monospace, monospace;
    font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------------
   Surfaces
   --------------------------------------------------------------------- */

.surface {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.surface-glass {
    background: color-mix(in srgb, var(--bg-surface) 72%, transparent);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border: 1px solid var(--border-subtle);
}

/* ---------------------------------------------------------------------
   Signature element: animated "pulse" border on KPI cards
   --------------------------------------------------------------------- */

.kpi-card {
    position: relative;
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lifted);
}

.kpi-card::before {
    content: "";
    position: absolute;
    inset: 0;
    padding: 1px;
    border-radius: var(--radius-xl);
    background: conic-gradient(from var(--pulse-angle, 0deg),
        var(--color-primary), var(--color-emerald), var(--color-amber), var(--color-primary));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.55;
    animation: pulse-rotate 6s linear infinite;
}

@keyframes pulse-rotate {
    to { --pulse-angle: 360deg; }
}

@property --pulse-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

@media (prefers-reduced-motion: reduce) {
    .kpi-card::before { animation: none; }
    * { transition: none !important; }
}

/* ---------------------------------------------------------------------
   Sidebar / Layout
   --------------------------------------------------------------------- */

.sidebar {
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.875rem;
    border-radius: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color 0.15s ease, color 0.15s ease;
}

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

.nav-link.active {
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
    color: var(--color-primary);
}

/* ---------------------------------------------------------------------
   Auth pages
   --------------------------------------------------------------------- */

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at 15% 15%, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 40%),
        radial-gradient(circle at 85% 85%, color-mix(in srgb, var(--color-emerald) 14%, transparent), transparent 40%),
        var(--bg-app);
}

.input-field {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface-alt);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-field:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    border-radius: 0.75rem;
    padding: 0.7rem 1.25rem;
    transition: background-color 0.15s ease, transform 0.1s ease;
}

.btn-primary:hover { background: var(--color-primary-dark); }
.btn-primary:active { transform: scale(0.98); }

/* Visible keyboard focus ring everywhere (accessibility) */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Scrollbar polish */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 8px; }

/* ---------------------------------------------------------------------
   Firebase auth-state visibility helper
   --------------------------------------------------------------------- */
.hidden-auth { display: none !important; }

/* ---------------------------------------------------------------------
   EN / BN language toggle
   --------------------------------------------------------------------- */
.lang-toggle-btn {
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}
.lang-toggle-btn.lang-active {
    background: var(--color-primary);
    color: #fff;
}

/* ---------------------------------------------------------------------
   Mini FAQ accordion (pricing page etc.) — hide native marker, we render
   our own chevron icon that rotates via the [open] state.
   --------------------------------------------------------------------- */
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }