/*
    AIMr Support – Modern Dark Theme
    - Keeps Bootstrap structure, upgrades visuals & UX
    - Accessible colors, clear focus states, reduced motion support
*/

/* Design tokens */
:root {
    --bg: #0e1116;
    --surface: #151a21;
    --surface-2: #19202a;
    --border: #273040;
    --text: #e6e9ef;
    --muted: #a3b1c6;

    /* Accent — purple */
    --accent: #a855f7;              /* primary accent */
    --accent-contrast: #0b1220;
    --accent-2: #8b5cf6;            /* gradient end */
    --accent-hover-1: #b975fa;      /* hover start */
    --accent-hover-2: #a277ff;      /* hover end */
    --accent-active-1: #9c66f5;     /* active start */
    --accent-active-2: #8a56e8;     /* active end */
    --accent-rgb: 168, 85, 247;     /* for rgba() */

    --shadow-elev-1: 0 6px 18px rgba(0, 0, 0, 0.35);
    --shadow-elev-2: 0 10px 30px rgba(0, 0, 0, 0.45);
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* Base */
html, body { height: 100%; }
body {
    background:
        radial-gradient(1000px 600px at 10% -10%, rgba(124, 92, 255, 0.10), transparent 60%),
        radial-gradient(900px 600px at 110% 10%, rgba(var(--accent-rgb), 0.08), transparent 60%),
        var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: rgba(var(--accent-rgb), 0.35);
    color: #fff;
}

a { color: #caa5ff; text-decoration: none; }
a:hover { color: #e6d6ff; text-decoration: underline; }

/* Containers */
.container { 
    /* Keep Bootstrap sizing; add subtle breathing room */
    padding-bottom: 2rem;
}

/* Navbar */
.navbar.bg-dark {
    background: linear-gradient(180deg, #11171f 0%, #0e141c 100%) !important;
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(120%) blur(6px);
}

.navbar-brand {
    color: #eaf0ff !important;
    font-weight: 700;
    letter-spacing: 0.2px;
}

.navbar-dark .navbar-nav .nav-link {
    color: #c7d3e6;
    opacity: 0.9;
    transition: color .2s ease, opacity .2s ease;
}

.nav-link {
    text-decoration: none !important;
}

.navbar-dark .navbar-nav .nav-link:hover { color: #ffffff; opacity: 1; }
.navbar-dark .navbar-nav .nav-link.active { color: #ffffff; position: relative; }
.navbar-dark .navbar-nav .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0.5rem;
    right: 0.5rem;
    bottom: 0.3rem;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #caa5ff);
    border-radius: 2px;
}

.navbar-toggler {
    border-color: rgba(255,255,255,0.15);
}
.navbar-toggler-icon { filter: invert(1) opacity(0.8); }

/* Headings */
h1, .display-5 { color: #edf2ff; letter-spacing: 0.2px; }
h1 { font-weight: 800; }

/* Cards */
.card {
    background: linear-gradient(180deg, var(--surface), var(--surface-2));
    border: 1px solid var(--border);
    box-shadow: var(--shadow-elev-1);
    transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elev-2);
    border-color: #324056;
}
.card .card-header {
    background: transparent;
    border-bottom: 1px solid var(--border);
    color: #dbe6ff;
    font-weight: 600;
}
.card .card-title { color: #e9eefc; }
.card .card-text { color: var(--muted); }

/* Buttons */
.btn { border-radius: var(--radius-md); }
.btn-primary {
    color: #fff;
    background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 100%);
    border: 1px solid #7a3ad2;
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.35);
}
.btn-primary:hover {
    color: #fff;
    background: linear-gradient(180deg, var(--accent-hover-1) 0%, var(--accent-hover-2) 100%);
    border-color: #8e5ae7;
}
.btn-primary:active {
    background: linear-gradient(180deg, var(--accent-active-1) 0%, var(--accent-active-2) 100%);
    border-color: #7d4fe0;
}
.btn-primary:focus {
    box-shadow: 0 0 0 .25rem rgba(var(--accent-rgb), 0.35);
}

/* Accordions */
.accordion-item {
    background-color: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    overflow: hidden;
}

.accordion-button {
    background-color: var(--surface);
    color: var(--text);
}

.accordion-button:not(.collapsed) {
    background-color: var(--surface-2);
    color: var(--text);
    box-shadow: inset 0 -1px 0 var(--border);
}

.accordion-button:focus {
    box-shadow: 0 0 0 .2rem rgba(var(--accent-rgb), 0.35);
    border-color: transparent;
}

/* make the chevron visible on dark */
.accordion-button::after {
    filter: invert(1) opacity(0.8);
}

.accordion-body { color: var(--muted); }

/* Media embeds */
.ratio, .ratio > * { border-radius: var(--radius-md); }
.ratio > iframe {
    box-shadow: var(--shadow-elev-1);
    border: 1px solid var(--border);
}

/* Utility tweaks */
.text-muted { color: var(--muted) !important; }
.bg-secondary { background-color: var(--surface-2) !important; }

/* CTA footer */
.cta-footer {
    margin-top: auto;
    padding: 2.25rem 0;
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(255,255,255,0.00), rgba(255,255,255,0.025));
}
.cta-footer .btn {
    padding: 0.9rem 1.25rem;
    font-weight: 700;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
    .card, .btn, .navbar-dark .navbar-nav .nav-link { transition: none !important; }
    .card:hover { transform: none !important; }
}