/* ==========================================================================
   Billqo Design System
   One accent gradient (indigo -> violet), ink/white/slate everywhere else.
   Radius hierarchy: 10px controls, 20px cards, 28px hero stages.
   ========================================================================== */

:root {
    --ink: #0b0e14;
    --ink-soft: #1c2130;
    --surface: #ffffff;
    --surface-alt: #f6f7fb;
    --surface-sunken: #eef0f7;
    --indigo: #4f46e5;
    --indigo-dark: #4338ca;
    --violet: #8b5cf6;
    --slate: #64748b;
    --slate-200: #e2e6ef;
    --slate-100: #eef1f7;
    --success: #10b17c;
    --warning: #d99a2b;
    --danger: #e0475a;

    --gradient-brand: linear-gradient(135deg, var(--indigo) 0%, var(--violet) 100%);
    --gradient-ink: linear-gradient(180deg, #11141d 0%, #0b0e14 100%);

    --shadow-xs: 0 1px 2px rgba(11, 14, 20, 0.04);
    --shadow-sm: 0 2px 8px rgba(11, 14, 20, 0.06);
    --shadow-md: 0 8px 24px rgba(11, 14, 20, 0.08);
    --shadow-lg: 0 24px 64px rgba(11, 14, 20, 0.14);
    --shadow-glow: 0 12px 40px rgba(79, 70, 229, 0.24);

    --radius-control: 10px;
    --radius-card: 20px;
    --radius-stage: 28px;

    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --dur-fast: 160ms;
    --dur-med: 320ms;
    --dur-slow: 620ms;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---- Foundations ---- */

html { scroll-behavior: smooth; }

/* FIX: guard against any transformed/offset element (hero chips, rotated
   stages, negative-margin decorations) pushing the layout wider than the
   viewport and causing a horizontal scrollbar. */
html, body { overflow-x: hidden; }

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--ink);
    background: var(--surface-alt);
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "ss01" 1;
}

h1, h2, h3, h4, h5, h6, .display-heading {
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--ink);
}

p, li, td, th, label, .body-text { color: var(--ink-soft); }

.text-muted { color: var(--slate) !important; }
.text-primary, .text-primary-brand { color: var(--indigo) !important; }

.tabular-nums { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

a { color: var(--indigo); text-decoration: none; transition: color var(--dur-fast) var(--ease-out); }
a:hover { color: var(--indigo-dark); }

:focus-visible {
    outline: 2px solid var(--indigo);
    outline-offset: 2px;
    border-radius: 4px;
}

::selection { background: rgba(79, 70, 229, 0.18); }

/* ---- Buttons ---- */

.btn {
    font-weight: 600;
    border-radius: var(--radius-control);
    padding: 0.55rem 1.1rem;
    transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
    border-width: 1.5px;
}

.btn:active { transform: scale(0.97); }

.btn-primary { --bs-primary: var(--indigo); }

.btn-primary {
    background: var(--gradient-brand);
    border-color: transparent;
    box-shadow: 0 1px 2px rgba(11,14,20,.08), 0 0 0 1px rgba(79,70,229,.05) inset;
}
.btn-primary:hover, .btn-primary:focus {
    background: var(--gradient-brand);
    filter: brightness(1.06);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
    border-color: transparent;
}

.btn-outline-primary { color: var(--indigo); border-color: var(--indigo); }
.btn-outline-primary:hover { background: var(--indigo); border-color: var(--indigo); transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.btn-outline-secondary, .btn-outline-danger, .btn-outline-success, .btn-outline-warning, .btn-outline-dark, .btn-outline-light {
    transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.btn-outline-secondary:hover, .btn-outline-danger:hover, .btn-outline-success:hover, .btn-outline-warning:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-lg { padding: 0.85rem 1.75rem; border-radius: 12px; font-size: 1.02rem; }
.btn-sm { border-radius: 8px; }

/* ---- Cards & surfaces ---- */

.card {
    border-radius: var(--radius-card);
    border: 1px solid rgba(11,14,20,0.06);
    box-shadow: var(--shadow-xs);
    transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}

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

.stat-card {
    border-radius: var(--radius-card);
    background: var(--surface);
    padding: 1.5rem;
    border: 1px solid rgba(11,14,20,0.06);
    box-shadow: var(--shadow-xs);
    transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
    position: relative;
    overflow: hidden;
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-card .stat-value { font-size: 1.65rem; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat-card .stat-label { color: var(--slate); font-size: 0.82rem; font-weight: 600; }

/* ---- Forms ---- */

.form-control, .form-select {
    border-radius: var(--radius-control);
    border: 1.5px solid var(--slate-200);
    padding: 0.6rem 0.85rem;
    transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.form-control:focus, .form-select:focus {
    border-color: var(--indigo);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}
.form-label { font-weight: 600; font-size: 0.88rem; color: var(--ink-soft); margin-bottom: 0.35rem; }
.form-check-input:checked { background-color: var(--indigo); border-color: var(--indigo); }

/* ---- Tables ---- */

.table { --bs-table-hover-bg: rgba(79, 70, 229, 0.035); }
.table thead th {
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0.01em;
    color: var(--slate);
    border-bottom: 1.5px solid var(--slate-200);
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
}
.table td { padding-top: 0.85rem; padding-bottom: 0.85rem; vertical-align: middle; }
.table-hover tbody tr { transition: background-color var(--dur-fast) var(--ease-out); }

/* ---- Badges ---- */

.badge { font-weight: 600; padding: 0.4em 0.75em; border-radius: 999px; letter-spacing: 0.01em; }

/* ---- Alerts / Flash ---- */

.alert { border-radius: 14px; border: 1.5px solid transparent; font-weight: 500; }
.alert-success { background: rgba(16, 177, 124, 0.08); color: #0a7d59; border-color: rgba(16, 177, 124, 0.2); }
.alert-danger { background: rgba(224, 71, 90, 0.08); color: #b7233a; border-color: rgba(224, 71, 90, 0.2); }
.alert-warning { background: rgba(217, 154, 43, 0.1); color: #8a6112; border-color: rgba(217, 154, 43, 0.24); }

/* ---- Scroll reveal (used once per element, triggered by IntersectionObserver in app.js) ---- */

[data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* FIX: if app.js fails to load, errors out, or the observer never fires,
   [data-reveal] content must not stay invisible forever. */
.no-js [data-reveal],
noscript [data-reveal] {
    opacity: 1;
    transform: none;
}

/* ---- Utility ---- */

.glass {
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
}
.glass-dark {
    background: rgba(11, 14, 20, 0.6);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
}
.text-gradient {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ==========================================================================
   Dashboard shell — sidebar + topbar (workspace-authenticated app)
   ========================================================================== */

.shell-sidebar {
    width: 248px;
    background: var(--gradient-ink);
    color: rgba(255,255,255,0.86);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    padding: 22px 16px;
    flex-shrink: 0;
    transition: transform var(--dur-med) var(--ease-out);
    z-index: 30;
}
.shell-sidebar::-webkit-scrollbar { width: 6px; }
.shell-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }

.shell-brand { font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em; color: #fff; padding: 6px 10px 22px; display: block; }

.shell-nav-label {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: rgba(255,255,255,0.38);
    padding: 16px 10px 6px;
    text-transform: uppercase;
}
.shell-nav-label:first-of-type { padding-top: 4px; }

.shell-nav-link {
    position: relative; /* FIX: required for the .is-active::before accent bar below */
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 10px;
    color: rgba(255,255,255,0.7);
    font-weight: 600;
    font-size: 0.9rem;
    transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.shell-nav-link i { font-size: 1.02rem; width: 20px; text-align: center; opacity: 0.9; }
.shell-nav-link:hover { background: rgba(255,255,255,0.06); color: #fff; }
.shell-nav-link.is-active {
    background: rgba(255,255,255,0.1);
    color: #fff;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}
/* FIX: original rule had no top/left/width/height, so it rendered as a
   zero-size, invisible element. Sized it into a left accent bar. */
.shell-nav-link.is-active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 3px;
    border-radius: 0 3px 3px 0;
    background: var(--indigo);
}

.shell-topbar {
    background: rgba(255,255,255,0.82);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    border-bottom: 1px solid rgba(11,14,20,0.06);
    padding: 14px 28px;
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.shell-main { flex-grow: 1; min-width: 0; background: var(--surface-alt); min-height: 100vh; }
.shell-content { padding: 28px; }

.sidebar-toggle-btn { display: none; }

@media (max-width: 991.98px) {
    .shell-sidebar {
        position: fixed;
        left: 0; top: 0;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }
    .shell-sidebar.is-open { transform: translateX(0); }
    .sidebar-toggle-btn { display: inline-flex; }
    .shell-content { padding: 20px 16px; }
    .shell-topbar { padding: 12px 16px; }
}

.sidebar-backdrop {
    display: none;
    position: fixed; inset: 0;
    background: rgba(11,14,20,0.4);
    z-index: 25;
}
.sidebar-backdrop.is-open { display: block; }