/* =====================================================
   글로벌 지표 기반 학습 연구 - 스타일시트
   색상 테마: 暮色灰紫 (Twilight Mauve)
   ===================================================== */

/* CSS Variables */
:root {
    --primary: #6B5A6B;
    --primary-light: #8D7E8D;
    --primary-lighter: #E8E0E8;
    --primary-dark: #5A4A5A;
    
    --bg-dark: #2A2330;
    --bg-medium: #3D3545;
    --bg-light: #F8F5F8;
    
    --text-dark: #2D2433;
    --text-medium: #6B5A6B;
    --text-light: #FFFFFF;
    --text-muted: #9A8D9A;
    
    --gradient-primary: linear-gradient(135deg, #6B5A6B 0%, #8D7E8D 100%);
    --gradient-dark: linear-gradient(180deg, #2A2330 0%, #3D3545 100%);
    --gradient-hero: linear-gradient(135deg, rgba(107, 90, 107, 0.95) 0%, rgba(45, 36, 51, 0.98) 100%);
    
    --shadow-soft: 0 4px 20px rgba(107, 90, 107, 0.15);
    --shadow-medium: 0 8px 32px rgba(107, 90, 107, 0.2);
    --shadow-strong: 0 12px 48px rgba(107, 90, 107, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-primary: 'Noto Sans KR', sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
    padding-bottom: 100px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-dark);
    overflow: hidden;
    padding: 80px 0 60px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/hero-bg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(42, 35, 48, 0.88) 0%, rgba(107, 90, 107, 0.75) 50%, rgba(45, 36, 51, 0.9) 100%);
    z-index: 1;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(141, 126, 141, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(232, 224, 232, 0.08) 0%, transparent 40%),
        linear-gradient(90deg, transparent 49.5%, rgba(141, 126, 141, 0.05) 50%, transparent 50.5%);
    background-size: 100% 100%, 100% 100%, 60px 60px;
    z-index: 2;
    animation: patternFloat 20s ease-in-out infinite;
}

@keyframes patternFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-10px) scale(1.02); }
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: 40px 20px;
    max-width: 800px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(232, 224, 232, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(232, 224, 232, 0.2);
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--primary-lighter);
    margin-bottom: 32px;
    letter-spacing: 0.05em;
}

.hero-tag i {
    font-size: 1rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--text-light);
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary-lighter) 0%, #C4B8C4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 20px;
    letter-spacing: 0.1em;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    margin-bottom: 0;
}

/* Hero Intro (Merged from section-intro) */
.hero-intro {
    margin-top: 48px;
    padding-top: 40px;
    position: relative;
}

.hero-intro-divider {
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    margin: 0 auto 32px;
    border-radius: 2px;
}

.hero-intro-title {
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    font-weight: 600;
    color: var(--text-light);
    line-height: 1.4;
    margin-bottom: 24px;
}

.hero-intro-title .highlight {
    background: linear-gradient(135deg, var(--primary-lighter) 0%, #C4B8C4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-intro-text {
    font-size: 1rem;
    color: rgba(232, 224, 232, 0.85);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto 12px;
}

.hero-intro-text:last-child {
    margin-bottom: 0;
}

/* =====================================================
   Sections Common
   ===================================================== */
.section {
    padding: 100px 0;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.section-tag.light {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: 20px;
}

.section-title .highlight {
    color: var(--primary);
}

.section-title.light {
    color: var(--text-light);
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 48px;
    text-align: center;
}


/* =====================================================
   Features Section
   ===================================================== */
.section-features {
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-item {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-item:hover {
    background: white;
    border-color: var(--primary-lighter);
    box-shadow: var(--shadow-soft);
    transform: translateY(-4px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: var(--primary-lighter);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.feature-item:hover .feature-icon {
    background: var(--gradient-primary);
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.feature-item:hover .feature-icon i {
    color: var(--text-light);
}

.feature-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

/* =====================================================
   Method Section
   ===================================================== */
.section-method {
    background: var(--bg-light);
}

.method-header {
    text-align: center;
    margin-bottom: 60px;
}

.method-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.method-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(107, 90, 107, 0.08);
    transition: var(--transition);
}

.method-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.method-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-light);
}

.method-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

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

/* =====================================================
   Community Section
   ===================================================== */
.section-community {
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.section-community::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 10% 50%, rgba(141, 126, 141, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 90% 20%, rgba(232, 224, 232, 0.1) 0%, transparent 40%);
}

.community-wrapper {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.community-content {
    position: relative;
}

.community-description {
    font-size: 1.1rem;
    color: rgba(232, 224, 232, 0.8);
    margin-bottom: 32px;
    line-height: 1.8;
}

.community-list {
    list-style: none;
}

.community-list li {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(232, 224, 232, 0.1);
}

.community-list li:last-child {
    border-bottom: none;
}

.community-list i {
    color: var(--primary-light);
    font-size: 1.2rem;
}

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

.community-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.community-image {
    width: 100%;
    max-width: 420px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(232, 224, 232, 0.1);
    transition: var(--transition);
}

.community-image:hover {
    transform: scale(1.02);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.4);
}

/* =====================================================
   Course Section
   ===================================================== */
.section-course {
    background: white;
}

.course-header {
    text-align: center;
    margin-bottom: 60px;
}

.course-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.course-timeline::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-lighter) 0%, var(--primary) 50%, var(--primary-lighter) 100%);
}

.timeline-item {
    position: relative;
    padding-left: 88px;
    padding-bottom: 40px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-icon {
    position: absolute;
    left: 8px;
    top: 0;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid white;
    box-shadow: var(--shadow-soft);
}

.timeline-icon i {
    font-size: 1rem;
    color: var(--text-light);
}

.timeline-content {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    border: 1px solid rgba(107, 90, 107, 0.08);
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    background: white;
    box-shadow: var(--shadow-soft);
}

.timeline-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
    background: var(--bg-dark);
    padding: 60px 0 100px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(232, 224, 232, 0.1);
    margin-bottom: 32px;
}

.footer-brand h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-light);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* =====================================================
   Fixed CTA Button
   ===================================================== */
.fixed-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    
    padding: 20px 24px 24px;
    display: flex;
    justify-content: center;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: var(--gradient-primary);
    color: var(--text-light);
    border: none;
    padding: 18px 48px;
    border-radius: 50px;
    font-family: var(--font-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(107, 90, 107, 0.4);
    min-width: 280px;
    animation: buttonPulse 1.5s ease-in-out infinite;
}

@keyframes buttonPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 8px 32px rgba(107, 90, 107, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 12px 40px rgba(107, 90, 107, 0.55);
    }
}

.cta-button:hover {
    animation: none;
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(107, 90, 107, 0.5);
}

.cta-button:active {
    transform: scale(0.98);
}

.cta-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex-shrink: 0;
}

/* =====================================================
   Modal
   ===================================================== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(42, 35, 48, 0.9);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 640px;
    width: 100%;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-strong);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    border-bottom: 1px solid var(--primary-lighter);
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
}

.modal-close {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--bg-light);
    color: var(--text-medium);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--primary-lighter);
    color: var(--primary);
}

.modal-body {
    padding: 32px;
    overflow-y: auto;
    flex: 1;
}

.modal-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 24px 0 12px;
}

.modal-body h3:first-child {
    margin-top: 0;
}

.modal-body p {
    font-size: 0.95rem;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 12px;
}

.modal-body ul {
    list-style: none;
    margin: 12px 0;
}

.modal-body ul li {
    position: relative;
    padding-left: 20px;
    font-size: 0.95rem;
    color: var(--text-medium);
    line-height: 1.8;
}

.modal-body ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 992px) {
    .community-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .community-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .community-list {
        text-align: left;
        display: inline-block;
    }
    
    .community-visual {
        max-width: 360px;
        margin: 0 auto;
    }
    
    .community-image {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }
    
    .hero {
        padding: 60px 0 50px;
    }
    
    .hero-content {
        padding: 30px 16px;
    }
    
    .hero-tag {
        padding: 8px 16px;
        font-size: 0.8rem;
        margin-bottom: 24px;
    }
    
    .hero-title {
        font-size: 2.2rem;
        margin-bottom: 12px;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 12px;
    }
    
    .hero-description {
        font-size: 0.9rem;
    }
    
    .hero-intro {
        margin-top: 36px;
        padding-top: 32px;
    }
    
    .hero-intro-title {
        font-size: 1.2rem;
        margin-bottom: 16px;
    }
    
    .hero-intro-text {
        font-size: 0.9rem;
        line-height: 1.7;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .feature-item {
        padding: 28px 20px;
        text-align: center;
    }
    
    .method-header {
        margin-bottom: 40px;
        text-align: center;
    }
    
    .method-cards {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .method-card {
        flex-direction: column;
        text-align: center;
        padding: 24px 20px;
        align-items: center;
    }
    
    .community-description {
        text-align: center;
    }
    
    .community-list li {
        justify-content: center;
    }
    
    .course-header {
        margin-bottom: 40px;
        text-align: center;
    }
    
    .course-timeline {
        padding-left: 0;
    }
    
    .course-timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
        padding-bottom: 28px;
    }
    
    .timeline-icon {
        left: 0;
        width: 40px;
        height: 40px;
    }
    
    .timeline-icon i {
        font-size: 0.85rem;
    }
    
    .timeline-content {
        padding: 20px;
    }
    
    .timeline-content h3 {
        font-size: 1rem;
    }
    
    .timeline-content p {
        font-size: 0.9rem;
    }
    
    .footer {
        padding: 40px 0 100px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px 24px;
    }
    
    .cta-button {
        padding: 14px 28px;
        font-size: 0.95rem;
        min-width: auto;
        gap: 10px;
    }
    
    .cta-icon {
        width: 22px;
        height: 22px;
    }
    
    .modal-content {
        max-height: 90vh;
        border-radius: var(--radius-lg);
        margin: 16px;
    }
    
    .modal-header {
        padding: 18px 20px;
    }
    
    .modal-header h2 {
        font-size: 1.1rem;
    }
    
    .modal-body {
        padding: 20px;
    }
    
    .modal-body h3 {
        font-size: 1rem;
    }
    
    .modal-body p,
    .modal-body ul li {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .section {
        padding: 48px 0;
    }
    
    .hero {
        min-height: auto;
        padding: 50px 0 40px;
    }
    
    .hero-content {
        padding: 24px 12px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        letter-spacing: 0.05em;
    }
    
    .hero-description {
        font-size: 0.85rem;
        letter-spacing: 0.1em;
    }
    
    .hero-intro {
        margin-top: 28px;
        padding-top: 24px;
    }
    
    .hero-intro-divider {
        width: 48px;
        margin-bottom: 24px;
    }
    
    .hero-intro-title {
        font-size: 1.1rem;
    }
    
    .hero-intro-text {
        font-size: 0.85rem;
    }
    
    .section-tag {
        padding: 6px 14px;
        font-size: 0.8rem;
        margin-bottom: 16px;
    }
    
    .section-title {
        font-size: 1.3rem;
        margin-bottom: 16px;
    }
    
    .section-description {
        font-size: 0.95rem;
        margin-bottom: 32px;
    }
    
    .feature-item {
        padding: 24px 16px;
    }
    
    .feature-icon {
        width: 52px;
        height: 52px;
        margin-bottom: 16px;
    }
    
    .feature-icon i {
        font-size: 1.2rem;
    }
    
    .feature-item h3 {
        font-size: 1.05rem;
        margin-bottom: 8px;
    }
    
    .feature-item p {
        font-size: 0.85rem;
    }
    
    .method-card {
        padding: 20px 16px;
    }
    
    .method-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .method-content h3 {
        font-size: 1rem;
    }
    
    .method-content p {
        font-size: 0.85rem;
    }
    
    .community-description {
        font-size: 0.95rem;
    }
    
    .community-list li {
        padding: 12px 0;
        gap: 12px;
    }
    
    .community-list span {
        font-size: 0.9rem;
    }
    
    .community-image {
        border-radius: var(--radius-lg);
    }
    
    .fixed-cta {
        padding: 12px 16px 16px;
    }
    
    .cta-button {
        width: 100%;
        padding: 14px 20px;
        font-size: 0.9rem;
    }
    
    .cta-icon {
        width: 20px;
        height: 20px;
    }
}

/* =====================================================
   Utilities & Animations
   ===================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Selection */
::selection {
    background: var(--primary-lighter);
    color: var(--primary-dark);
}