/**
 * BolivarTech V2 — Tech Dark Theme (Professional Edition)
 *
 * Advanced CSS with ambient effects, scroll animations, gradient accents,
 * and visual depth appropriate for an R&D technology company.
 *
 * Palette: Deep Navy (#0a192f) + Teal accent (#64ffda) + Electric Blue (#4fc3f7)
 */

/* ──────────────────────────────────────────────────────────────── */
/* CSS Custom Properties                                           */
/* ──────────────────────────────────────────────────────────────── */

:root {
    --bt-primary:    #0a192f;
    --bt-secondary:  #112240;
    --bt-tertiary:   #0d2137;
    --bt-accent:     #64ffda;
    --bt-accent-rgb: 100, 255, 218;
    --bt-accent2:    #4fc3f7;
    --bt-accent2-rgb: 79, 195, 247;
    --bt-text:       #e6f1ff;
    --bt-text-muted: #8892b0;
    --bt-card-bg:    #112240;
    --bt-border:     #233554;
    --bt-link:       #64ffda;
    --bt-link-hover: #a8fff1;
    --bt-danger:     #ff6b6b;
    --bt-footer-bg:  #020c1b;
    --bt-glow:       rgba(100, 255, 218, 0.15);
    --bt-glow2:      rgba(79, 195, 247, 0.12);

    --bs-body-bg:    var(--bt-primary);
    --bs-body-color: var(--bt-text);
    --bs-link-color: var(--bt-link);
    --bs-link-hover-color: var(--bt-link-hover);
}

/* ──────────────────────────────────────────────────────────────── */
/* Base & Typography                                               */
/* ──────────────────────────────────────────────────────────────── */

html {
    overflow-x: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bt-primary);
    color: var(--bt-text);
    line-height: 1.7;
    overflow-x: hidden;
    max-width: 100vw;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.01em;
}

a {
    color: var(--bt-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--bt-link-hover);
}

::selection {
    background: rgba(var(--bt-accent-rgb), 0.25);
}

/* ──────────────────────────────────────────────────────────────── */
/* Scroll Animations                                               */
/* ──────────────────────────────────────────────────────────────── */

.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* ──────────────────────────────────────────────────────────────── */
/* Navbar                                                          */
/* ──────────────────────────────────────────────────────────────── */

.bt-navbar {
    background: rgba(10, 25, 47, 0.6);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(var(--bt-accent-rgb), 0.05);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0.85rem 0;
    z-index: 1000;
}

.bt-navbar.scrolled {
    background: rgba(10, 25, 47, 0.95);
    border-bottom-color: var(--bt-border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4),
                0 0 60px rgba(var(--bt-accent-rgb), 0.03);
    padding: 0.5rem 0;
}

.bt-navbar .navbar-brand img {
    transition: all 0.3s ease;
    filter: drop-shadow(0 0 8px rgba(var(--bt-accent-rgb), 0.2));
}

.bt-navbar .nav-link {
    color: var(--bt-text-muted);
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.03em;
    padding: 0.5rem 1rem;
    transition: all 0.25s ease;
    position: relative;
}

.bt-navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--bt-accent);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    border-radius: 1px;
}

.bt-navbar .nav-link:hover::after,
.bt-navbar .nav-link.active::after {
    width: 60%;
}

.bt-navbar .nav-link:hover,
.bt-navbar .nav-link:focus {
    color: var(--bt-accent);
}

.bt-navbar .nav-link.active {
    color: var(--bt-accent);
}

.bt-navbar .dropdown-menu {
    background: rgba(17, 34, 64, 0.98);
    border: 1px solid var(--bt-border);
    border-radius: 0.75rem;
    padding: 0.75rem 0;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5),
                0 0 40px rgba(var(--bt-accent-rgb), 0.05);
    margin-top: 0.5rem;
}

.bt-navbar .dropdown-item {
    color: var(--bt-text-muted);
    font-size: 0.85rem;
    padding: 0.6rem 1.5rem;
    transition: all 0.2s ease;
    border-radius: 0.25rem;
    margin: 0 0.5rem;
}

.bt-navbar .dropdown-item:hover,
.bt-navbar .dropdown-item:focus {
    color: var(--bt-accent);
    background: rgba(var(--bt-accent-rgb), 0.08);
}

.btn-outline-accent {
    color: var(--bt-accent);
    border: 1px solid var(--bt-accent);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    border-radius: 0.375rem;
    transition: all 0.3s ease;
}

.btn-outline-accent:hover {
    background: var(--bt-accent);
    color: var(--bt-primary);
    box-shadow: 0 0 20px rgba(var(--bt-accent-rgb), 0.3);
}

/* ──────────────────────────────────────────────────────────────── */
/* Hero Section                                                    */
/* ──────────────────────────────────────────────────────────────── */

.bt-hero {
    background: var(--bt-primary);
    position: relative;
    padding: 6rem 0 5rem;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

/* Animated mesh gradient background */
.bt-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 20% 40%, rgba(var(--bt-accent-rgb), 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 80% 20%, rgba(var(--bt-accent2-rgb), 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 50% 60% at 60% 80%, rgba(100, 100, 255, 0.04) 0%, transparent 70%);
    animation: heroGlow 12s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes heroGlow {
    0% { opacity: 0.7; }
    50% { opacity: 1; }
    100% { opacity: 0.8; }
}

/* Grid pattern overlay */
.bt-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(var(--bt-accent-rgb), 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--bt-accent-rgb), 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    pointer-events: none;
}

.bt-hero .hero-subtitle {
    color: var(--bt-accent);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.bt-hero .hero-subtitle::before {
    content: '';
    display: inline-block;
    width: 40px;
    height: 2px;
    background: var(--bt-accent);
}

.bt-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    max-width: 680px;
    background: linear-gradient(135deg, var(--bt-text) 0%, rgba(var(--bt-accent-rgb), 0.9) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bt-hero .hero-description {
    font-size: 1.05rem;
    color: var(--bt-text-muted);
    max-width: 540px;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

/* Hero visual element (right side) */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.hero-graphic {
    position: relative;
    width: 100%;
    max-width: 460px;
    aspect-ratio: 1;
}

/* Animated orbital rings */
.hero-orbit {
    position: absolute;
    border: 1px solid rgba(var(--bt-accent-rgb), 0.12);
    border-radius: 50%;
    animation: orbit-spin linear infinite;
}

.hero-orbit:nth-child(1) {
    inset: 5%;
    animation-duration: 25s;
}

.hero-orbit:nth-child(2) {
    inset: 18%;
    animation-duration: 18s;
    animation-direction: reverse;
    border-color: rgba(var(--bt-accent2-rgb), 0.1);
}

.hero-orbit:nth-child(3) {
    inset: 32%;
    animation-duration: 12s;
}

/* Orbital dots */
.hero-orbit::before {
    content: '';
    position: absolute;
    top: -4px;
    left: 50%;
    width: 8px;
    height: 8px;
    background: var(--bt-accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--bt-accent), 0 0 30px rgba(var(--bt-accent-rgb), 0.3);
}

.hero-orbit:nth-child(2)::before {
    background: var(--bt-accent2);
    box-shadow: 0 0 12px var(--bt-accent2);
    top: auto;
    bottom: -4px;
    left: 30%;
}

@keyframes orbit-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Center shield icon */
.hero-center-icon {
    position: absolute;
    inset: 38%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, rgba(var(--bt-accent-rgb), 0.08) 0%, transparent 70%);
    border-radius: 50%;
    font-size: 3rem;
    color: var(--bt-accent);
    text-shadow: 0 0 40px rgba(var(--bt-accent-rgb), 0.4);
}

/* Floating tech labels */
.hero-float-label {
    position: absolute;
    background: rgba(17, 34, 64, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid var(--bt-border);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--bt-text-muted);
    white-space: nowrap;
    animation: float-gentle 6s ease-in-out infinite;
}

.hero-float-label .label-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.hero-float-label:nth-child(5) { top: 8%; right: 5%; animation-delay: 0s; }
.hero-float-label:nth-child(6) { top: 40%; right: 0%; animation-delay: 1.5s; }
.hero-float-label:nth-child(7) { bottom: 15%; right: 10%; animation-delay: 3s; }
.hero-float-label:nth-child(8) { bottom: 30%; left: 0%; animation-delay: 4.5s; }

@keyframes float-gentle {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Buttons */
.btn-accent {
    background: linear-gradient(135deg, var(--bt-accent) 0%, #4dd8b5 100%);
    color: var(--bt-primary);
    font-weight: 700;
    padding: 0.8rem 2.25rem;
    border: none;
    border-radius: 0.5rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.btn-accent::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.15) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-accent:hover {
    color: var(--bt-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(var(--bt-accent-rgb), 0.35),
                0 0 60px rgba(var(--bt-accent-rgb), 0.15);
}

.btn-accent:hover::before {
    opacity: 1;
}

.btn-outline-light-custom {
    color: var(--bt-text);
    border: 1px solid rgba(var(--bt-accent-rgb), 0.3);
    font-weight: 600;
    padding: 0.8rem 2.25rem;
    border-radius: 0.5rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    background: rgba(var(--bt-accent-rgb), 0.03);
}

.btn-outline-light-custom:hover {
    border-color: var(--bt-accent);
    color: var(--bt-accent);
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgba(var(--bt-accent-rgb), 0.15);
    background: rgba(var(--bt-accent-rgb), 0.05);
}

@media (max-width: 991px) {
    .hero-visual { display: none; }
    .bt-hero { min-height: 70vh; }
}

@media (max-width: 768px) {
    .bt-hero { padding: 4rem 0 3rem; min-height: auto; }
}

/* ──────────────────────────────────────────────────────────────── */
/* Stats Bar                                                       */
/* ──────────────────────────────────────────────────────────────── */

.bt-stats {
    background: var(--bt-secondary);
    border-top: 1px solid var(--bt-border);
    border-bottom: 1px solid var(--bt-border);
    padding: 3rem 0;
    position: relative;
}

.stat-item {
    text-align: center;
    padding: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--bt-accent) 0%, var(--bt-accent2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--bt-text-muted);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ──────────────────────────────────────────────────────────────── */
/* Cards (Enhanced)                                                */
/* ──────────────────────────────────────────────────────────────── */

.bt-card {
    background: linear-gradient(145deg, var(--bt-card-bg) 0%, rgba(17, 34, 64, 0.6) 100%);
    border: 1px solid var(--bt-border);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    height: 100%;
    position: relative;
    overflow: hidden;
}

/* Gradient top accent on hover */
.bt-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--bt-accent), var(--bt-accent2));
    opacity: 0;
    transition: opacity 0.4s ease;
}

.bt-card:hover {
    border-color: rgba(var(--bt-accent-rgb), 0.3);
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3),
                0 0 40px rgba(var(--bt-accent-rgb), 0.05);
}

.bt-card:hover::before {
    opacity: 1;
}

.bt-card .card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.75rem;
    background: linear-gradient(135deg, rgba(var(--bt-accent-rgb), 0.12) 0%, rgba(var(--bt-accent2-rgb), 0.08) 100%);
    color: var(--bt-accent);
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    transition: all 0.3s ease;
}

.bt-card:hover .card-icon {
    box-shadow: 0 0 20px rgba(var(--bt-accent-rgb), 0.2);
    transform: scale(1.05);
}

.bt-card .card-category {
    color: var(--bt-accent);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.bt-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.bt-card p {
    color: var(--bt-text-muted);
    font-size: 0.875rem;
    margin-bottom: 0;
    line-height: 1.6;
}

/* ──────────────────────────────────────────────────────────────── */
/* Section Utilities                                               */
/* ──────────────────────────────────────────────────────────────── */

.bt-section {
    padding: 6rem 0;
    position: relative;
}

.bt-section-alt {
    background: var(--bt-secondary);
}

/* Ambient glow for sections */
.bt-section-glow {
    position: relative;
}

.bt-section-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 600px;
    height: 400px;
    transform: translateX(-50%);
    background: radial-gradient(ellipse, rgba(var(--bt-accent-rgb), 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    color: var(--bt-text-muted);
    font-size: 1.05rem;
    max-width: 600px;
    line-height: 1.7;
}

.accent-line {
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--bt-accent), var(--bt-accent2));
    margin-bottom: 1.5rem;
    border-radius: 2px;
}

/* ──────────────────────────────────────────────────────────────── */
/* Values Pills (Enhanced)                                         */
/* ──────────────────────────────────────────────────────────────── */

.value-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.5rem;
    border: 1px solid var(--bt-border);
    border-radius: 3rem;
    color: var(--bt-text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0.4rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    background: rgba(var(--bt-accent-rgb), 0.02);
}

.value-pill:hover {
    border-color: var(--bt-accent);
    color: var(--bt-accent);
    background: rgba(var(--bt-accent-rgb), 0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(var(--bt-accent-rgb), 0.1);
}

.value-pill i {
    font-size: 0.9rem;
}

/* ──────────────────────────────────────────────────────────────── */
/* Value Cards (About page)                                        */
/* ──────────────────────────────────────────────────────────────── */

.value-card {
    background: linear-gradient(145deg, var(--bt-card-bg) 0%, rgba(17, 34, 64, 0.6) 100%);
    border: 1px solid var(--bt-border);
    border-radius: 1rem;
    padding: 1.75rem;
    height: 100%;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--bt-accent), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.value-card:hover {
    border-color: rgba(var(--bt-accent-rgb), 0.3);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.value-card:hover::before { opacity: 1; }

.value-card h5 {
    color: var(--bt-accent);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.value-card p {
    color: var(--bt-text-muted);
    font-size: 0.85rem;
    margin-bottom: 0;
    line-height: 1.6;
}

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

.team-card {
    background: linear-gradient(145deg, var(--bt-card-bg) 0%, rgba(17, 34, 64, 0.6) 100%);
    border: 1px solid var(--bt-border);
    border-radius: 1rem;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.team-card:hover {
    border-color: rgba(var(--bt-accent-rgb), 0.3);
    transform: translateY(-4px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
}

.team-card img {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--bt-border);
    margin-bottom: 1.25rem;
    transition: border-color 0.3s ease;
}

.team-card:hover img {
    border-color: var(--bt-accent);
    box-shadow: 0 0 25px rgba(var(--bt-accent-rgb), 0.15);
}

.team-card h4 {
    font-weight: 700;
    font-size: 1.15rem;
    margin-bottom: 0.25rem;
}

.team-card .role {
    color: var(--bt-accent);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* ──────────────────────────────────────────────────────────────── */
/* Page Header (inner pages) — Enhanced                            */
/* ──────────────────────────────────────────────────────────────── */

.bt-page-header {
    background: var(--bt-primary);
    padding: 5rem 0 3.5rem;
    position: relative;
    overflow: hidden;
}

.bt-page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 70% 30%, rgba(var(--bt-accent-rgb), 0.05) 0%, transparent 70%),
        radial-gradient(ellipse 40% 50% at 20% 70%, rgba(var(--bt-accent2-rgb), 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.bt-page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--bt-border), transparent);
}

.bt-page-header h1 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    position: relative;
}

.bt-page-header .lead {
    color: var(--bt-text-muted);
    font-size: 1.05rem;
    position: relative;
}

/* ──────────────────────────────────────────────────────────────── */
/* Tables (product pages)                                          */
/* ──────────────────────────────────────────────────────────────── */

.bt-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 0.5rem;
    overflow: hidden;
}

.bt-table th,
.bt-table td {
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--bt-border);
}

.bt-table thead th {
    background: rgba(var(--bt-accent-rgb), 0.06);
    color: var(--bt-accent);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-bottom: 2px solid var(--bt-border);
}

.bt-table tbody td {
    color: var(--bt-text-muted);
    font-size: 0.9rem;
}

.bt-table tbody tr {
    transition: background 0.2s ease;
}

.bt-table tbody tr:hover {
    background: rgba(var(--bt-accent-rgb), 0.04);
}

/* ──────────────────────────────────────────────────────────────── */
/* Download Cards (Enhanced)                                       */
/* ──────────────────────────────────────────────────────────────── */

.download-card {
    background: linear-gradient(145deg, var(--bt-card-bg) 0%, rgba(17, 34, 64, 0.6) 100%);
    border: 1px solid var(--bt-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: all 0.3s ease;
}

.download-card:hover {
    border-color: rgba(var(--bt-accent-rgb), 0.3);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.download-card .dl-icon {
    color: var(--bt-accent);
    font-size: 2rem;
    flex-shrink: 0;
}

.download-card .dl-info h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--bt-text);
}

.download-card .dl-info small {
    color: var(--bt-text-muted);
}

/* ──────────────────────────────────────────────────────────────── */
/* Accordion (FAQ)                                                 */
/* ──────────────────────────────────────────────────────────────── */

.accordion-item {
    background: var(--bt-card-bg);
    border: 1px solid var(--bt-border);
    border-radius: 0.5rem !important;
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.accordion-button {
    background: var(--bt-card-bg);
    color: var(--bt-text);
    font-weight: 600;
    box-shadow: none;
    font-size: 0.95rem;
}

.accordion-button:not(.collapsed) {
    background: rgba(var(--bt-accent-rgb), 0.05);
    color: var(--bt-accent);
    box-shadow: none;
}

.accordion-button::after {
    filter: brightness(0) invert(0.7);
}

.accordion-body {
    color: var(--bt-text-muted);
    line-height: 1.7;
}

/* ──────────────────────────────────────────────────────────────── */
/* Portfolio Filter                                                */
/* ──────────────────────────────────────────────────────────────── */

.filter-btn {
    background: transparent;
    border: 1px solid var(--bt-border);
    color: var(--bt-text-muted);
    padding: 0.5rem 1.25rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--bt-accent);
    color: var(--bt-accent);
    background: rgba(var(--bt-accent-rgb), 0.08);
    box-shadow: 0 0 15px rgba(var(--bt-accent-rgb), 0.1);
}

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

.contact-card {
    background: linear-gradient(145deg, var(--bt-card-bg) 0%, rgba(17, 34, 64, 0.6) 100%);
    border: 1px solid var(--bt-border);
    border-radius: 1rem;
    padding: 2.5rem 2rem;
    text-align: center;
    height: 100%;
    transition: all 0.3s ease;
}

.contact-card:hover {
    border-color: rgba(var(--bt-accent-rgb), 0.3);
    transform: translateY(-4px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.contact-card i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--bt-accent), var(--bt-accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.25rem;
    display: inline-block;
}

.contact-card h5 {
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.contact-card a {
    color: var(--bt-text-muted);
    transition: color 0.2s ease;
}

.contact-card a:hover {
    color: var(--bt-accent);
}

/* ──────────────────────────────────────────────────────────────── */
/* Legal Pages                                                     */
/* ──────────────────────────────────────────────────────────────── */

.legal-content {
    color: var(--bt-text-muted);
    line-height: 1.8;
}

.legal-content h2,
.legal-content h3 {
    color: var(--bt-text);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--bt-border);
}

.legal-content ul {
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
}

/* ──────────────────────────────────────────────────────────────── */
/* Footer (Enhanced)                                               */
/* ──────────────────────────────────────────────────────────────── */

.bt-footer {
    background: var(--bt-footer-bg);
    border-top: 1px solid var(--bt-border);
    position: relative;
}

.bt-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 400px;
    height: 200px;
    transform: translateX(-50%) translateY(-50%);
    background: radial-gradient(ellipse, rgba(var(--bt-accent-rgb), 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.footer-heading {
    color: var(--bt-text);
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1.25rem;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 25px;
    height: 2px;
    background: var(--bt-accent);
    border-radius: 1px;
}

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: var(--bt-text-muted);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.footer-links a:hover {
    color: var(--bt-accent);
    padding-left: 4px;
}

.social-icons a {
    color: var(--bt-text-muted);
    transition: all 0.3s ease;
    display: inline-flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    border: 1px solid var(--bt-border);
}

.social-icons a:hover {
    color: var(--bt-accent);
    border-color: var(--bt-accent);
    background: rgba(var(--bt-accent-rgb), 0.08);
    transform: translateY(-2px);
}

/* ──────────────────────────────────────────────────────────────── */
/* Scrollbar                                                       */
/* ──────────────────────────────────────────────────────────────── */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bt-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bt-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bt-text-muted);
}

/* ──────────────────────────────────────────────────────────────── */
/* Hash codes (product pages)                                      */
/* ──────────────────────────────────────────────────────────────── */

.hash-code {
    font-family: 'Courier New', Consolas, monospace;
    font-size: 0.65rem;
    word-break: break-all;
    color: var(--bt-text-muted);
    background: rgba(0, 0, 0, 0.25);
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    border: 1px solid rgba(var(--bt-accent-rgb), 0.05);
}

/* ──────────────────────────────────────────────────────────────── */
/* Misc Utilities                                                  */
/* ──────────────────────────────────────────────────────────────── */

.gradient-text {
    background: linear-gradient(135deg, var(--bt-accent) 0%, var(--bt-accent2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glow-border {
    box-shadow: 0 0 20px rgba(var(--bt-accent-rgb), 0.08),
                inset 0 0 20px rgba(var(--bt-accent-rgb), 0.02);
}