/* ══════════════════════════════════════════════════════════════
   clfsec CSS Design System
   Modern minimal cybersecurity-themed design
   24 CSS variables · Light & Dark themes
   ══════════════════════════════════════════════════════════════ */

/* ─── Light Theme (Default) ─── */
:root {
    /* Primary palette - Cyan/Blue */
    --clfsec-primary: #0ea5e9;
    --clfsec-primary-dark: #0284c7;
    --clfsec-primary-light: #38bdf8;
    --clfsec-accent: #06b6d4;

    /* Functional colors */
    --clfsec-success: #10b981;
    --clfsec-warning: #f59e0b;
    --clfsec-danger: #ef4444;
    --clfsec-info: #3b82f6;

    /* Background & text */
    --clfsec-bg: #ffffff;
    --clfsec-bg-secondary: #f8fafc;
    --clfsec-bg-card: #ffffff;
    --clfsec-text: #1e293b;
    --clfsec-text-secondary: #64748b;
    --clfsec-border: #e2e8f0;

    /* Navbar */
    --clfsec-navbar-bg: rgba(255, 255, 255, 0.92);
    --clfsec-navbar-text: #1e293b;

    /* Scrollbar */
    --clfsec-scrollbar-thumb: #0ea5e9;
    --clfsec-scrollbar-track: #e2e8f0;

    /* Bootstrap overrides */
    --bs-primary-bg-subtle: #0ea5e9;
    --bs-hui: #1e293b;
}

/* ─── Dark Theme ─── */
[data-bs-theme="dark"] {
    --clfsec-primary: #38bdf8;
    --clfsec-primary-dark: #0ea5e9;
    --clfsec-primary-light: #7dd3fc;
    --clfsec-accent: #22d3ee;

    --clfsec-success: #34d399;
    --clfsec-warning: #fbbf24;
    --clfsec-danger: #f87171;
    --clfsec-info: #60a5fa;

    --clfsec-bg: #0f172a;
    --clfsec-bg-secondary: #1e293b;
    --clfsec-bg-card: #1e293b;
    --clfsec-text: #e2e8f0;
    --clfsec-text-secondary: #94a3b8;
    --clfsec-border: #334155;

    --clfsec-navbar-bg: rgba(15, 23, 42, 0.92);
    --clfsec-navbar-text: #e2e8f0;

    --clfsec-scrollbar-thumb: #38bdf8;
    --clfsec-scrollbar-track: #1e293b;

    --bs-body-bg: #0f172a;
    --bs-body-color: #e2e8f0;
    --bs-primary-bg-subtle: #38bdf8;
}

/* ─── Global Styles ─── */
html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background-color: var(--clfsec-bg);
    color: var(--clfsec-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--clfsec-primary);
    transition: color 0.2s ease;
}
a:hover {
    color: var(--clfsec-primary-dark);
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--clfsec-scrollbar-track);
}
::-webkit-scrollbar-thumb {
    background: var(--clfsec-scrollbar-thumb);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--clfsec-primary-dark);
}

/* ─── Navbar ─── */
.clfsec-navbar {
    background: var(--clfsec-navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--clfsec-border);
    transition: background 0.3s ease;
}
.clfsec-navbar .navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--clfsec-navbar-text);
}
.clfsec-navbar .nav-link {
    color: var(--clfsec-navbar-text);
    font-weight: 500;
    position: relative;
}
.clfsec-navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--clfsec-primary);
    transition: width 0.3s ease;
}
.clfsec-navbar .nav-link:hover::after,
.clfsec-navbar .nav-link.active::after {
    width: 100%;
}

/* ─── Navbar Right Section ─── */
.nav-right-section {
    gap: 0.5rem;
    margin-left: 1rem;
}

/* Search box */
.search-box .search-form {
    display: flex;
    align-items: center;
}
.search-box .search-input {
    width: 160px;
    height: 38px;
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--clfsec-border);
    border-radius: 8px 0 0 8px;
    background: var(--clfsec-bg-secondary);
    color: var(--clfsec-text);
    font-size: 0.875rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.search-box .search-input:focus {
    outline: none;
    border-color: var(--clfsec-primary);
    box-shadow: 0 0 0 2px rgba(14,165,233,0.15);
}
.search-box .search-btn {
    height: 38px;
    width: 40px;
    border: 1px solid var(--clfsec-primary);
    border-radius: 0 8px 8px 0;
    background: var(--clfsec-primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}
.search-box .search-btn:hover {
    background: var(--clfsec-primary-dark);
    border-color: var(--clfsec-primary-dark);
}

/* Theme toggle */
.float-btn.bd-theme {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 1px solid var(--clfsec-border);
    background: var(--clfsec-bg-secondary);
    color: var(--clfsec-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
    padding: 0;
}
.float-btn.bd-theme:hover {
    background: var(--clfsec-primary);
    color: #fff;
    border-color: var(--clfsec-primary);
}

/* User login/register */
.user-wrapper .user-login,
.user-wrapper .user-reg {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    text-decoration: none;
    transition: color 0.2s, background 0.2s;
}
.user-wrapper .user-login {
    color: var(--clfsec-text);
}
.user-wrapper .user-login:hover {
    color: var(--clfsec-primary);
}
.user-wrapper .user-reg {
    background: var(--clfsec-primary);
    color: #fff;
}
.user-wrapper .user-reg:hover {
    background: var(--clfsec-primary-dark);
    color: #fff;
}
.user-wrapper .divider {
    color: var(--clfsec-border);
    margin: 0 0.25rem;
    font-size: 0.8rem;
}
.logged-user-wrapper .user-avatar img {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--clfsec-border);
}
.logged-user-wrapper .user-info {
    margin-left: 0.5rem;
    line-height: 1.2;
}
.logged-user-wrapper .user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--clfsec-text);
}
.logged-user-wrapper .user-email {
    font-size: 0.75rem;
    color: var(--clfsec-text-secondary);
}

/* Mobile search & user */
.mobile-search-form {
    display: flex;
    align-items: center;
}
.mobile-search-input {
    width: 120px;
    height: 34px;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--clfsec-border);
    border-radius: 6px 0 0 6px;
    background: var(--clfsec-bg-secondary);
    color: var(--clfsec-text);
    font-size: 0.8rem;
}
.mobile-search-btn,
.mobile-user-btn {
    width: 34px;
    height: 34px;
    border: 1px solid var(--clfsec-border);
    background: var(--clfsec-bg-secondary);
    color: var(--clfsec-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, color 0.2s;
}
.mobile-search-btn {
    border-radius: 0 6px 6px 0;
    border-left: none;
}
.mobile-user-btn {
    border-radius: 6px;
}

/* ─── Banner ─── */
.clfsec-banner {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.clfsec-banner .clfsec-banner-img {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 50%);
}
.clfsec-banner .banner-overlay {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #ffffff;
    padding: 2rem;
    width: 100%;
}
.clfsec-banner .banner-title {
    font-size: 2.75rem;
    font-weight: 800;
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
    margin-bottom: 1rem;
}
.clfsec-banner .banner-subtitle {
    font-size: 1.15rem;
    opacity: 0.8;
    max-width: 500px;
    margin: 0 auto 0.25rem;
}
.banner-subtitle-secondary {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.6);
    font-style: italic;
    max-width: 500px;
    margin: 0 auto;
}
.banner-cta .clfsec-btn-outline {
    border-color: rgba(255,255,255,0.5);
    color: #ffffff;
}
.banner-cta .clfsec-btn-outline:hover {
    border-color: #ffffff;
    background: rgba(255,255,255,0.1);
    box-shadow: none;
}

/* Grid overlay */
.clfsec-grid-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(14,165,233,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14,165,233,0.06) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: grid-scroll 20s linear infinite;
    pointer-events: none;
    z-index: 1;
}
@keyframes grid-scroll {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

/* Typewriter */
.typewriter {
    display: inline-block;
}
.typewriter::after {
    content: '|';
    animation: blink-caret 0.75s step-end infinite;
    color: var(--clfsec-primary, #0ea5e9);
}
@keyframes blink-caret {
    from, to { opacity: 1; }
    50% { opacity: 0; }
}

/* Section title decoration */
.section-title {
    position: relative;
    display: inline-block;
    padding-bottom: 0.35em;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--clfsec-primary);
    border-radius: 2px;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .clfsec-banner {
        min-height: 420px;
    }
    .clfsec-banner .banner-title {
        font-size: 1.75rem;
    }
    .clfsec-banner .banner-subtitle {
        font-size: 0.95rem;
    }
    .banner-subtitle-secondary {
        font-size: 0.85rem;
    }
}

/* ─── Cards ─── */
.clfsec-card {
    background: var(--clfsec-bg-card);
    border: 1px solid var(--clfsec-border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.clfsec-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}
[data-bs-theme="dark"] .clfsec-card:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

/* ─── Buttons ─── */
.clfsec-btn {
    display: inline-block;
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
    border: none;
    cursor: pointer;
}
.clfsec-btn-primary {
    background: var(--clfsec-primary);
    color: #ffffff;
}
.clfsec-btn-primary:hover {
    background: var(--clfsec-primary-dark);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.4);
}
.clfsec-btn-outline {
    background: transparent;
    color: var(--clfsec-primary);
    border: 2px solid var(--clfsec-primary);
}
.clfsec-btn-outline:hover {
    background: var(--clfsec-primary);
    color: #ffffff;
}

/* ─── Typography ─── */
.text-gradient {
    background: linear-gradient(135deg, var(--clfsec-primary), var(--clfsec-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ─── Blockquote ─── */
blockquote {
    border-left: 4px solid var(--clfsec-primary);
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--clfsec-bg-secondary);
    border-radius: 0 8px 8px 0;
    color: var(--clfsec-text-secondary);
}

/* ─── Preloader ─── */
.clfsec-preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--clfsec-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
.clfsec-preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}
.clfsec-preloader .loader-pulse {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--clfsec-primary);
    animation: clfsec-pulse 1.2s ease-in-out infinite;
}
@keyframes clfsec-pulse {
    0%, 100% { transform: scale(0); opacity: 1; }
    50% { transform: scale(1); opacity: 0.3; }
}

/* ─── Floating Action Menu ─── */
.floating-action-menu {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1030;
}
.floating-action-menu .float-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--clfsec-primary);
    color: #ffffff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}
.floating-action-menu .float-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.5);
}

/* ─── Horizontal Rule ─── */
.horizontal {
    opacity: 0.25;
    border-color: var(--clfsec-border);
}

/* ─── Breadcrumb ─── */
.breadcrumb-head {
    padding: 1rem 0;
    font-size: 0.875rem;
    color: var(--clfsec-text-secondary);
}
.breadcrumb-head i {
    margin-right: 0.35rem;
}

/* ─── Toast ─── */
.toast {
    transition: transform .3s ease-out !important;
    transform: translateX(100%);
}
.toast.fade.show {
    transform: translateX(0);
}

/* ─── Related Posts Card ─── */
.clfsec-related-card {
    transition: transform 0.2s ease;
}
.clfsec-related-card:hover {
    transform: translateY(-2px);
}
.clfsec-related-card:hover h6 {
    color: var(--clfsec-primary);
}

/* ─── Footer ─── */
.clfsec-footer {
    background: var(--clfsec-bg-secondary);
    border-top: 1px solid var(--clfsec-border);
}
.clfsec-footer a:hover {
    color: var(--clfsec-primary) !important;
}