/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Color Palette */
    --color-navy-bg: #070e17;
    --color-navy-dark: #0c1824;
    --color-navy-light: #16283b;
    --color-gold: #eab308;
    --color-gold-hover: #ca8a04;
    --color-gold-glow: rgba(234, 179, 8, 0.25);
    --color-bege: #eae5d9;
    --color-text-light: #f8f9fa;
    --color-text-muted: #94a3b8;
    --color-white: #ffffff;
    
    /* Layout & Spacing */
    --max-width: 1200px;
    --header-height: 80px;
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--color-navy-bg);
    color: var(--color-text-light);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: 'Lora', serif;
    font-weight: 600;
    letter-spacing: -0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Custom Selection */
::selection {
    background-color: var(--color-gold);
    color: var(--color-navy-bg);
}

/* ==========================================================================
   REUSABLE UI COMPONENTS
   ========================================================================== */
.badge {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border-radius: 100px;
    background-color: rgba(234, 179, 8, 0.1);
    border: 1px solid rgba(234, 179, 8, 0.25);
    color: var(--color-gold);
    margin-bottom: 1.5rem;
}

.badge.gold {
    background-color: var(--color-gold);
    color: var(--color-navy-bg);
    border: 1px solid var(--color-gold);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--color-gold);
    color: var(--color-navy-bg);
}

.btn-primary:hover {
    background-color: var(--color-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-gold);
    border-color: rgba(234, 179, 8, 0.4);
}

.btn-secondary:hover {
    background-color: rgba(234, 179, 8, 0.05);
    border-color: var(--color-gold);
    transform: translateY(-2px);
}

.btn-gold {
    background-color: var(--color-gold);
    color: var(--color-navy-bg);
    box-shadow: 0 4px 15px var(--color-gold-glow);
}

.btn-gold:hover {
    background-color: var(--color-gold-hover);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(234, 179, 8, 0.4);
}

/* Pulse animation for key CTAs */
.btn-pulse {
    position: relative;
    animation: btnPulse 2s infinite;
}

@keyframes btnPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(234, 179, 8, 0.5);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(234, 179, 8, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(234, 179, 8, 0);
    }
}

/* Section Header */
.section-header {
    text-align: center;
    max-width: 850px;
    margin: 0 auto 4rem auto;
}

.section-title {
    font-size: 2.5rem;
    color: var(--color-white);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(7, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Logo Design */
.logo-link {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.svg-logo {
    transition: var(--transition-smooth);
}

.logo-link:hover .svg-logo {
    transform: rotate(10deg);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: 'Lora', serif;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-white);
}

.logo-subtitle {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--color-gold);
    margin-top: -2px;
}

/* Desktop Menu Links */
.desktop-nav .nav-list {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.desktop-nav .nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: 0.5rem 0;
    position: relative;
}

.desktop-nav .nav-link:hover,
.desktop-nav .nav-link.active {
    color: var(--color-white);
}

/* Slide line effect on nav link hover */
.desktop-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-gold);
    transition: var(--transition-smooth);
}

.desktop-nav .nav-link:hover::after,
.desktop-nav .nav-link.active::after {
    width: 100%;
}

/* Mobile Hamburger Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 25px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.mobile-menu-btn .bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-white);
    transition: var(--transition-smooth);
}

/* Active hamburger states */
.mobile-menu-btn.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.active .bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation Panel */
.mobile-nav-panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-navy-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    transition: var(--transition-smooth);
}

.mobile-nav-panel.open {
    right: 0;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    list-style: none;
    gap: 2.5rem;
}

.mobile-nav-link {
    font-size: 1.8rem;
    font-family: 'Lora', serif;
    color: var(--color-text-muted);
}

.mobile-nav-link:hover {
    color: var(--color-gold);
}

/* ==========================================================================
   SECTION 1: SOBRE (HERO)
   ========================================================================== */
.hero-section {
    padding-top: calc(var(--header-height) + 4rem);
    padding-bottom: 6rem;
    position: relative;
    background: radial-gradient(circle at 10% 20%, rgba(22, 40, 59, 0.4) 0%, transparent 45%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-title {
    font-size: 3.2rem;
    line-height: 1.15;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.hero-intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-intro strong {
    color: var(--color-white);
    font-weight: 600;
}

/* Credentials Grid */
.credentials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
    width: 100%;
}

.credential-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 12px;
    transition: var(--transition-smooth);
}

.credential-card:hover {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: rgba(234, 179, 8, 0.2);
    transform: translateY(-5px);
}

.card-icon {
    color: var(--color-gold);
    margin-bottom: 1rem;
    display: flex;
}

.credential-card h3 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.3rem;
}

.credential-card p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Hero Media / Image Layout */
.hero-media {
    display: flex;
    justify-content: center;
}

.image-wrapper {
    position: relative;
    border-radius: 16px;
    overflow: visible;
}

.hero-image {
    width: 380px;
    height: 480px;
    object-fit: cover;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    z-index: 2;
    position: relative;
}

.image-border-decoration {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--color-gold);
    border-radius: 16px;
    z-index: 1;
    transition: var(--transition-smooth);
}

.image-wrapper:hover .image-border-decoration {
    transform: translate(-10px, -10px);
}

/* Wave Separation element */
.wave-separator {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    line-height: 0;
    z-index: 3;
}

.wave-separator svg {
    display: block;
    width: 100%;
    height: 60px;
}

/* ==========================================================================
   SECTION 2: AULAS (Aulas de Alemão)
   ========================================================================== */
.aulas-section {
    padding: 8rem 0;
    background-color: var(--color-navy-dark);
    position: relative;
}

.aulas-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 5rem;
    align-items: center;
}

.aulas-text-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.aulas-paragraph {
    font-size: 1.05rem;
    color: var(--color-text-muted);
}

.aulas-paragraph strong {
    color: var(--color-white);
}

.methodology-callout {
    background-color: rgba(255, 255, 255, 0.02);
    border-left: 3px solid var(--color-gold);
    padding: 1.5rem 2rem;
    border-radius: 0 12px 12px 0;
    margin-top: 1rem;
}

.methodology-callout h4 {
    color: var(--color-gold);
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.methodology-callout p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Aulas Features Columns */
.aulas-features-column {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature-box {
    display: flex;
    gap: 1.5rem;
    background-color: var(--color-navy-light);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition-smooth);
}

.feature-box:hover {
    transform: translateX(10px);
    border-color: rgba(234, 179, 8, 0.2);
}

.feature-num {
    font-family: 'Lora', serif;
    font-size: 1.8rem;
    color: var(--color-gold);
    font-weight: 700;
    line-height: 1;
}

.feature-info h4 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.feature-info p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ==========================================================================
   SECTION 3: DSD (PREPARAÇÃO & E-BOOK MOCKUP)
   ========================================================================== */
.dsd-section {
    padding: 8rem 0;
    background-color: var(--color-navy-bg);
    background: radial-gradient(circle at 80% 80%, rgba(22, 40, 59, 0.4) 0%, transparent 45%);
}

.dsd-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.dsd-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.dsd-description {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

/* Benefits Checklist */
.benefits-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 3rem;
    width: 100%;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.benefit-item span {
    font-size: 1rem;
    color: var(--color-text-light);
}

.check-icon {
    flex-shrink: 0;
}

.cta-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.cta-hint {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-left: 0.2rem;
}

.arrow-icon {
    transition: var(--transition-smooth);
}

.btn-gold:hover .arrow-icon {
    transform: translateX(4px);
}

/* ==========================================================================
   3D CSS BOOK MOCKUP DESIGNS
   ========================================================================== */
.dsd-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px; /* Essential for 3D depth */
}

.book-container {
    width: 280px;
    height: 380px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.book {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateY(-20deg) rotateX(10deg);
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Rotate book cover to explore 3D on hover */
.book-container:hover .book {
    transform: rotateY(-5deg) rotateX(5deg) scale(1.05);
}

/* Book parts styling */
.book-cover {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: var(--color-navy-light);
    border: 2px solid var(--color-gold);
    border-radius: 4px 12px 12px 4px;
    z-index: 5;
    transform: translateZ(10px); /* Move forward in space */
    box-shadow: 5px 5px 25px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    padding: 8px;
}

.book-cover-inner {
    width: 100%;
    height: 100%;
    border: 1px solid rgba(234, 179, 8, 0.3);
    border-radius: 3px 9px 9px 3px;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-navy-light) 100%);
}

.book-cover-inner::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.05);
}

.book-badge {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    font-weight: 700;
    color: var(--color-gold);
    border: 1px solid var(--color-gold);
    padding: 0.3rem 0.8rem;
    border-radius: 100px;
    margin-bottom: 2rem;
}

.book-title-main {
    font-family: 'Lora', serif;
    font-size: 2.8rem;
    line-height: 1;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.book-title-sub {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--color-text-muted);
    letter-spacing: 0.2em;
    margin-bottom: 1.5rem;
}

.book-target {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-gold);
    letter-spacing: 0.05em;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    margin-bottom: auto;
}

.book-author {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.book-lmu-seal {
    width: 40px;
    height: 40px;
    opacity: 0.8;
}

.seal-svg {
    width: 100%;
    height: 100%;
}

/* Spine side block */
.book-spine {
    position: absolute;
    top: 0;
    left: 0;
    width: 20px;
    height: 100%;
    background-color: var(--color-navy-dark);
    border: 1px solid var(--color-gold);
    transform: rotateY(-90deg) translateZ(10px);
    transform-origin: left;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px 0 0 4px;
}

.spine-text {
    transform: rotate(90deg);
    white-space: nowrap;
    font-size: 0.45rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-gold);
}

/* Paper Pages Side (gives it the depth of a physical book) */
.book-pages {
    position: absolute;
    top: 4px;
    right: 0;
    width: 16px;
    height: calc(100% - 8px);
    background: linear-gradient(to right, #e2e8f0 0%, #ffffff 100%);
    border-top: 1px solid #cbd5e1;
    border-bottom: 1px solid #cbd5e1;
    border-radius: 0 4px 4px 0;
    transform: rotateY(90deg) translateZ(268px);
    transform-origin: right;
    box-shadow: 3px 0 10px rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
    background-color: var(--color-navy-dark);
    padding: 5rem 0 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 0.8fr 1.2fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.5rem;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.footer-links h4,
.footer-contact h4 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1.5rem;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-links a {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.footer-links a:hover {
    color: var(--color-gold);
    transform: translateX(3px);
}

.footer-contact p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.contact-email {
    font-family: 'Lora', serif;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-gold);
    border-bottom: 1px solid transparent;
}

.contact-email:hover {
    border-bottom-color: var(--color-gold);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (MOBILE OPTIMIZATIONS)
   ========================================================================== */

/* Tablet & Smaller Devices */
@media (max-width: 1024px) {
    html {
        font-size: 15px;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-intro {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .aulas-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .dsd-container {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }
    
    .dsd-content {
        align-items: center;
    }
    
    .benefits-list {
        align-items: center;
    }
}

/* Mobile Devices */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .desktop-nav {
        display: none;
    }
    
    .hero-title {
        font-size: 2.4rem;
    }
    
    .credentials-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .hero-image {
        width: 100%;
        max-width: 320px;
        height: auto;
        aspect-ratio: 4/5;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .footer-info {
        align-items: center;
    }
    
    .footer-links ul {
        align-items: center;
    }
}

/* ==========================================================================
   NEW DSD RESTYLED SUB-SECTIONS (PREMIUM CARDS & DETAILS)
   ========================================================================== */
.dsd-details-block,
.dsd-features-block,
.dsd-audience-block {
    margin-top: 8rem;
    position: relative;
}

.subsection-title {
    font-size: 2.2rem;
    color: var(--color-white);
    margin-bottom: 0.8rem;
    line-height: 1.25;
}

/* Part 2: details grid (O que faz diferença) */
.details-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3.5rem;
}

.detail-card-premium {
    background-color: rgba(255, 255, 255, 0.015);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 2.5rem;
    border-radius: 16px;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.detail-card-premium:hover {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: rgba(234, 179, 8, 0.25);
    transform: translateY(-6px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.detail-card-premium h4 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.detail-card-premium p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.detail-card-premium .card-extra-text {
    margin-top: 1.2rem;
    font-size: 0.9rem;
}

/* Part 3: features list (O que a apostila oferece) */
.features-list-premium {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    margin-top: 3.5rem;
}

.feature-item-premium {
    background-color: var(--color-navy-dark);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 3rem;
    border-radius: 20px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-item-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background-color: var(--color-gold);
    opacity: 0.5;
}

.feature-item-premium:hover {
    border-color: rgba(234, 179, 8, 0.15);
}

.feature-header-premium {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
}

.feature-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gold);
}

.feature-item-premium h4 {
    font-size: 1.6rem;
    color: var(--color-white);
    line-height: 1.3;
}

.feature-item-premium p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

.feature-source {
    font-size: 0.9rem;
    font-style: italic;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-intro-text {
    margin-bottom: 2rem;
}

/* Exam parts sub-grid */
.exam-parts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
    margin-top: 2rem;
}

.exam-part-card {
    background-color: var(--color-navy-light);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 1.8rem;
    border-radius: 12px;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.exam-part-card:hover {
    transform: translateY(-5px);
    border-color: rgba(234, 179, 8, 0.25);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.exam-part-badge {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-white);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 1.2rem;
    letter-spacing: 0.05em;
}

.lvl-lv { background-color: #1a365d; }
.lvl-hv { background-color: #4c1d95; }
.lvl-sk { background-color: #064e3b; }
.lvl-mk { background-color: #78350f; }

.exam-part-card h5 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 0.1rem;
}

.exam-part-sub {
    font-size: 0.75rem;
    color: var(--color-gold);
    font-weight: 500;
    margin-bottom: 1rem;
    display: block;
}

.exam-part-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Part 4: Parent directed audience block */
.audience-box-wrapper {
    background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-navy-light) 100%);
    border: 1px solid rgba(234, 179, 8, 0.25);
    padding: 4.5rem 3rem;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

.audience-box-wrapper::after {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, var(--color-gold-glow) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    z-index: 1;
    pointer-events: none;
}

.audience-box-content {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    position: relative;
    z-index: 2;
}

.audience-box-content h3 {
    font-size: 2.3rem;
    color: var(--color-white);
    line-height: 1.25;
}

.audience-text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.audience-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    margin-top: 1.5rem;
    width: 100%;
}

.btn-large {
    padding: 1.1rem 2.8rem;
    font-size: 1rem;
    border-radius: 10px;
}

/* Media Queries updates for new layouts */
@media (max-width: 1024px) {
    .dsd-details-block,
    .dsd-features-block,
    .dsd-audience-block {
        margin-top: 6rem;
    }

    .subsection-title {
        font-size: 1.8rem;
    }

    .details-grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .exam-parts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .feature-item-premium {
        padding: 2rem;
    }
    
    .audience-box-wrapper {
        padding: 3rem 2rem;
    }
    
    .audience-box-content h3 {
        font-size: 1.8rem;
    }
}

@media (max-width: 600px) {
    .exam-parts-grid {
        grid-template-columns: 1fr;
    }
    
    .btn-large {
        width: 100%;
        padding: 1.1rem 1.5rem;
        font-size: 0.9rem;
    }
}