/* ========================================
   Corporate Navy Theme (vue-021) - CSS
======================================== */

:root {
    --color-primary: #1E3A5F;
    --color-secondary: #4682B4;
    --color-accent: #C7923E;
    --color-text: #0F1B2D;
    --color-bg: #FFFFFF;
    --color-light: #F8FAFC;
    --color-border: #E2E8F0;
    --color-muted: #64748B;
    --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --shadow-sm: 0 1px 3px rgba(30, 58, 95, 0.06);
    --shadow-md: 0 4px 12px rgba(30, 58, 95, 0.08);
    --shadow-lg: 0 8px 24px rgba(30, 58, 95, 0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --max-width: 1200px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

/* ========================================
   Utility Classes
======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-muted);
    font-weight: 400;
    line-height: 1.6;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header .accent-line {
    width: 48px;
    height: 3px;
    background-color: var(--color-accent);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

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

/* ========================================
   Header
======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 36px;
    height: 36px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 0.25rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

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

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

.header-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1.25rem;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
}

.header-cta:hover {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

.header-cta .cta-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
    z-index: 999;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-link {
    display: block;
    padding: 0.85rem 0;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

.mobile-nav-cta {
    display: block;
    margin-top: 1rem;
    padding: 0.75rem;
    text-align: center;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    color: var(--color-primary);
}

/* ========================================
   Hero Section
======================================== */
.hero-section {
    padding: 10rem 0 5rem;
    background-color: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background-image:
        linear-gradient(135deg, transparent 24%, rgba(30, 58, 95, 0.02) 25%, rgba(30, 58, 95, 0.02) 26%, transparent 27%),
        linear-gradient(225deg, transparent 24%, rgba(30, 58, 95, 0.02) 25%, rgba(30, 58, 95, 0.02) 26%, transparent 27%),
        linear-gradient(315deg, transparent 24%, rgba(30, 58, 95, 0.02) 25%, rgba(30, 58, 95, 0.02) 26%, transparent 27%),
        linear-gradient(45deg, transparent 24%, rgba(30, 58, 95, 0.02) 25%, rgba(30, 58, 95, 0.02) 26%, transparent 27%);
    background-size: 80px 80px;
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 20%;
    right: -5%;
    width: 400px;
    height: 400px;
    border: 1px solid rgba(30, 58, 95, 0.05);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.hero-content {
    max-width: 680px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background-color: var(--color-light);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-muted);
    margin-bottom: 1.5rem;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.25;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}

.hero-title .accent-text {
    color: var(--color-accent);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-muted);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    max-width: 560px;
}

.hero-buttons {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 4rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    background-color: var(--color-primary);
    color: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    border: 2px solid var(--color-primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: #15304E;
    border-color: #15304E;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    background-color: transparent;
    color: var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    border: 2px solid var(--color-accent);
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background-color: var(--color-accent);
    color: var(--color-bg);
    transform: translateY(-1px);
}

/* Hero Stats */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    padding: 2rem 2.5rem;
    background-color: var(--color-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.hero-stat-item {
    text-align: center;
    position: relative;
}

.hero-stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 10%;
    right: -1rem;
    width: 1px;
    height: 80%;
    background-color: var(--color-border);
}

.hero-stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.hero-stat-label {
    font-size: 0.8rem;
    color: var(--color-muted);
    font-weight: 400;
}

/* ========================================
   Features Section
======================================== */
.features-section {
    padding: 6rem 0;
    background-color: var(--color-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
}

.feature-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: 2.25rem;
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-top-color: var(--color-accent);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-light);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-primary);
}

.feature-card:hover .feature-icon {
    background-color: rgba(30, 58, 95, 0.06);
}

.feature-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.6rem;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.7;
}

/* ========================================
   Board Widgets Section
======================================== */
.boards-section {
    padding: 6rem 0;
    background-color: var(--color-bg);
}

.boards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
}

.board-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.board-card:hover {
    box-shadow: var(--shadow-md);
}

.board-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background-color: var(--color-primary);
}

.board-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-bg);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.board-card-title svg {
    width: 16px;
    height: 16px;
    stroke: var(--color-accent);
}

.board-card-more {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 400;
    cursor: pointer;
    transition: var(--transition);
}

.board-card-more:hover {
    color: var(--color-accent);
}

.board-card-body {
    padding: 0.5rem 0;
}

.board-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.board-item:last-child {
    border-bottom: none;
}

.board-item:hover {
    background-color: var(--color-light);
}

.board-item-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.board-item-category {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-secondary);
    background-color: rgba(70, 130, 180, 0.08);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    white-space: nowrap;
}

.board-item-title {
    font-size: 0.85rem;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
}

.board-item-title:hover {
    color: var(--color-primary);
}

.board-item-date {
    font-size: 0.75rem;
    color: var(--color-muted);
    white-space: nowrap;
    margin-left: 1rem;
}

/* ========================================
   Stats Section
======================================== */
.stats-section {
    padding: 5rem 0;
    background-color: var(--color-primary);
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 600px;
    height: 600px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 50%;
    pointer-events: none;
}

.stats-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -5%;
    width: 400px;
    height: 400px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 50%;
    pointer-events: none;
}

.stats-inner {
    position: relative;
    z-index: 1;
}

.stats-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.stats-header .section-title {
    color: var(--color-bg);
}

.stats-header .section-subtitle {
    color: rgba(255, 255, 255, 0.65);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-card {
    text-align: center;
    padding: 2rem 1rem;
}

.stat-number {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--color-bg);
    margin-bottom: 0.5rem;
    line-height: 1;
}

.stat-number .stat-suffix {
    font-size: 1.5rem;
    font-weight: 600;
}

.stat-underline {
    width: 32px;
    height: 2px;
    background-color: var(--color-accent);
    margin: 0.75rem auto;
    border-radius: 1px;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 400;
}

/* ========================================
   CTA Section
======================================== */
.cta-section {
    padding: 5.5rem 0;
    background-color: var(--color-light);
}

.cta-inner {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(30, 58, 95, 0.06);
    border-radius: var(--radius-md);
    margin: 0 auto 1.5rem;
}

.cta-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--color-primary);
}

.cta-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.cta-desc {
    font-size: 1rem;
    color: var(--color-muted);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2.5rem;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
}

.cta-button:hover {
    background-color: var(--color-accent);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(199, 146, 62, 0.2);
}

/* ========================================
   Footer
======================================== */
.site-footer {
    background-color: var(--color-primary);
    padding: 4rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

.footer-logo svg {
    width: 28px;
    height: 28px;
}

.footer-logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-bg);
}

.footer-brand-desc {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

.footer-column-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-bg);
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.footer-link {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    transition: var(--transition);
}

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

.footer-bottom {
    padding: 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copyright {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
}

.footer-bottom-link {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    transition: var(--transition);
}

.footer-bottom-link:hover {
    color: var(--color-accent);
}

/* ========================================
   Responsive - Tablet Landscape (1024px~1279px)
======================================== */
@media (min-width: 1024px) and (max-width: 1279px) {
    .hero-title {
        font-size: 2.75rem;
    }

    .hero-stats {
        gap: 1.5rem;
        padding: 1.75rem 2rem;
    }

    .stats-grid {
        gap: 1.5rem;
    }

    .footer-grid {
        gap: 2rem;
    }
}

/* ========================================
   Responsive - Tablet Portrait (768px~1023px)
======================================== */
@media (min-width: 768px) and (max-width: 1023px) {
    .header-nav {
        display: none;
    }

    .header-cta {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-section {
        padding: 8rem 0 4rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .hero-stat-item:nth-child(2)::after {
        display: none;
    }

    .features-grid {
        gap: 1.25rem;
    }

    .boards-grid {
        gap: 1.25rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
}

/* ========================================
   Responsive - Mobile (360px~767px)
======================================== */
@media (max-width: 767px) {
    .header-nav {
        display: none;
    }

    .header-cta {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-section {
        padding: 7rem 0 3rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
        padding: 1.5rem;
    }

    .hero-stat-item::after {
        display: none;
    }

    .hero-stat-number {
        font-size: 1.4rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .feature-card {
        padding: 1.75rem;
    }

    .boards-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .board-item-category {
        display: none;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .stat-number .stat-suffix {
        font-size: 1.1rem;
    }

    .cta-title {
        font-size: 1.4rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* ========================================
   Responsive - Fold/Flip (~359px)
======================================== */
@media (max-width: 359px) {
    html {
        font-size: 14px;
    }

    .hero-title {
        font-size: 1.7rem;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Responsive - FHD (1920px~2559px)
======================================== */
@media (min-width: 1920px) and (max-width: 2559px) {
    html { font-size: 17px; }
}

/* ========================================
   Responsive - QHD (2560px~3839px)
======================================== */
@media (min-width: 2560px) and (max-width: 3839px) {
    html { font-size: 19px; }
}

/* ========================================
   Responsive - UHD (3840px~)
======================================== */
@media (min-width: 3840px) {
    html { font-size: 22px; }
}