/* ============================================================
   CyberSNova — Global Stylesheet
   Design tokens follow the official color theme:
   Primary #0F172A | Secondary #2563EB | Accent #38BDF8
   Success #22C55E | Background #F8FAFC
   ============================================================ */

:root {
    --csn-primary: #0F172A;
    --csn-secondary: #2563EB;
    --csn-accent: #38BDF8;
    --csn-success: #22C55E;
    --csn-bg: #F8FAFC;
    --csn-text-muted: #64748B;
    --csn-border: #E2E8F0;
    --csn-radius: 14px;
    --csn-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --csn-shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.14);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--csn-bg);
    color: var(--csn-primary);
    line-height: 1.65;
}

h1, h2, h3, h4, h5, h6,
.font-heading {
    font-family: 'Poppins', 'Inter', sans-serif;
    font-weight: 700;
    color: var(--csn-primary);
}

a {
    text-decoration: none;
}

::selection {
    background: var(--csn-accent);
    color: var(--csn-primary);
}

/* ---------------- Navbar ---------------- */
.csn-navbar {
    background-color: var(--csn-primary);
    padding-top: 0.85rem;
    padding-bottom: 0.85rem;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.csn-brand {
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    font-size: 1.4rem;
    color: #fff !important;
    letter-spacing: 0.3px;
}

.csn-brand i {
    color: var(--csn-accent);
    margin-right: 6px;
}

.csn-logo-img {
    border-radius: 6px;
    object-fit: contain;
}

.csn-navbar .nav-link {
    color: rgba(255, 255, 255, 0.82);
    font-weight: 500;
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.csn-navbar .nav-link:hover,
.csn-navbar .nav-link.active {
    color: #fff;
    background-color: rgba(56, 189, 248, 0.15);
}

.csn-btn-accent {
    background-color: var(--csn-accent);
    color: var(--csn-primary) !important;
    font-weight: 600;
    border-radius: 8px;
    padding: 0.5rem 1.25rem;
    border: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.csn-btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(56, 189, 248, 0.35);
    color: var(--csn-primary);
}

.csn-btn-primary {
    background-color: var(--csn-secondary);
    color: #fff;
    font-weight: 600;
    border-radius: 8px;
    padding: 0.65rem 1.5rem;
    border: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.csn-btn-primary:hover {
    background-color: #1d4ed8;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

.csn-btn-outline {
    border: 2px solid var(--csn-secondary);
    color: var(--csn-secondary);
    font-weight: 600;
    border-radius: 8px;
    padding: 0.6rem 1.4rem;
    background: transparent;
    transition: all 0.2s ease;
}

.csn-btn-outline:hover {
    background-color: var(--csn-secondary);
    color: #fff;
}

/* ---------------- Hero ---------------- */
.csn-hero {
    background: linear-gradient(135deg, var(--csn-primary) 0%, #16213e 55%, #1e3a5f 100%);
    color: #fff;
    padding: 6rem 0 7rem;
    position: relative;
    overflow: hidden;
}

.csn-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 85% 20%, rgba(56, 189, 248, 0.18), transparent 45%),
                       radial-gradient(circle at 10% 80%, rgba(37, 99, 235, 0.2), transparent 40%);
    pointer-events: none;
}

.csn-hero .badge-eyebrow {
    background: rgba(56, 189, 248, 0.15);
    color: var(--csn-accent);
    border: 1px solid rgba(56, 189, 248, 0.35);
    font-weight: 600;
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
    font-size: 0.85rem;
    display: inline-block;
}

.csn-hero h1 {
    color: #fff;
    font-size: clamp(2.1rem, 4vw, 3.25rem);
    line-height: 1.15;
}

.csn-hero p.lead {
    color: rgba(255, 255, 255, 0.78);
    font-size: 1.15rem;
}

.csn-hero-stats {
    display: flex;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-top: 2.5rem;
}

.csn-hero-stats .stat-number {
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    font-size: 1.8rem;
    color: var(--csn-accent);
}

.csn-hero-stats .stat-label {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

/* ---------------- Section wrapper ---------------- */
.csn-section {
    padding: 5rem 0;
}

.csn-section-alt {
    background-color: #EFF4FA;
}

.section-eyebrow {
    color: var(--csn-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-size: 0.8rem;
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    margin-bottom: 0.75rem;
}

.section-subtitle {
    color: var(--csn-text-muted);
    max-width: 640px;
}

/* ---------------- Cards ---------------- */
.csn-card {
    background: #fff;
    border: 1px solid var(--csn-border);
    border-radius: var(--csn-radius);
    box-shadow: var(--csn-shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    height: 100%;
}

.csn-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--csn-shadow-hover);
}

.csn-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--csn-secondary), var(--csn-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.csn-card .card-body {
    padding: 1.75rem;
}

/* Internship card duration badge */
.badge-duration {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--csn-secondary);
    font-weight: 600;
    border-radius: 50px;
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
}

/* ---------------- Process / Timeline ---------------- */
.csn-process-step {
    text-align: center;
    padding: 1.5rem 1rem;
    position: relative;
}

.csn-process-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--csn-primary);
    color: var(--csn-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.3rem;
    margin: 0 auto 1rem;
    border: 3px solid var(--csn-accent);
}

/* ---------------- Certificate Preview ---------------- */
.csn-certificate-frame {
    border: 10px solid #fff;
    border-radius: var(--csn-radius);
    box-shadow: var(--csn-shadow-hover);
    background: #fff;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.csn-certificate-frame::before {
    content: "";
    position: absolute;
    inset: 12px;
    border: 2px solid var(--csn-accent);
    border-radius: 8px;
    pointer-events: none;
}

/* ---------------- FAQ ---------------- */
.accordion-button:not(.collapsed) {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--csn-secondary);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--csn-border);
}

/* ---------------- Footer ---------------- */
.csn-footer {
    background-color: var(--csn-primary);
    color: rgba(255, 255, 255, 0.85);
}

.csn-footer-brand {
    color: #fff;
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
}

.csn-footer-brand i {
    color: var(--csn-accent);
}

.footer-heading {
    color: #fff;
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links li {
    margin-bottom: 0.55rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.65);
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--csn-accent);
}

.footer-social {
    color: rgba(255, 255, 255, 0.75);
    transition: color 0.2s ease;
}

.footer-social:hover {
    color: var(--csn-accent);
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.12);
    margin: 2rem 0 1.5rem;
}

/* ---------------- Generic page header (About, Courses, etc.) ---------------- */
.csn-page-header {
    background: var(--csn-primary);
    color: #fff;
    padding: 3.5rem 0;
}

.csn-page-header h1 {
    color: #fff;
}

/* ---------------- Utilities ---------------- */
.text-accent { color: var(--csn-accent) !important; }
.text-secondary-brand { color: var(--csn-secondary) !important; }
.bg-soft-blue { background-color: rgba(37, 99, 235, 0.06); }

/* ---------------- Scroll reveal ---------------- */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------------- Certificate verification result ---------------- */
.csn-verify-result {
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    border-left: 4px solid transparent;
}

.csn-verify-success {
    background-color: rgba(34, 197, 94, 0.08);
    border-left-color: var(--csn-success);
    color: #14532d;
}

.csn-verify-success h5 {
    color: #15803d;
}

.csn-verify-success i {
    color: var(--csn-success);
}

.csn-verify-revoked,
.csn-verify-notfound {
    background-color: rgba(245, 158, 11, 0.08);
    border-left-color: #f59e0b;
}

.csn-verify-revoked h5,
.csn-verify-notfound h5 {
    color: #b45309;
}

.csn-verify-revoked i,
.csn-verify-notfound i {
    color: #f59e0b;
}

.csn-verify-field {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--csn-border);
    border-radius: 8px;
    padding: 0.6rem 0.9rem;
}

.csn-verify-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--csn-text-muted);
    margin-bottom: 0.15rem;
}

.csn-verify-value {
    font-weight: 600;
    color: var(--csn-primary);
}

@media (max-width: 767.98px) {
    .csn-hero { padding: 4rem 0 4.5rem; }
    .csn-hero-stats { gap: 1.5rem; }
    .csn-section { padding: 3.25rem 0; }
}