/* =========================================
   VARIABLES & DESIGN TOKENS
   ========================================= */
:root {
    /* Colors */
    --color-bg: #FFFFFF;
    --color-ivory: #FAF9F6;
    /* Traditional, warm ivory background */
    --color-black: #111111;
    /* Deep ink black */
    --color-black-light: #333333;
    --color-gray: #888888;
    --color-gray-light: #E0E0E0;
    --color-red: #000000;
    /* Traditional seal red */
    --color-red-hover: #383838;

    /* Typography */
    --font-serif: 'Noto Serif KR', serif;
    --font-sans: 'Pretendard', sans-serif;

    /* Layout & Spacing */
    --nav-height: 80px;
    --container-width: 1100px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Effects */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: var(--nav-height);
    /* For sticky nav offset */
}

body {
    font-family: var(--font-sans);
    color: var(--color-black);
    background-color: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

.text-red {
    color: var(--color-red) !important;
}

.text-white {
    color: #FFFFFF;
}

.text-gray {
    color: var(--color-gray);
}

.text-bold {
    font-weight: 700;
}

.bg-ivory {
    background-color: var(--color-ivory);
}

.bg-black {
    background-color: var(--color-black);
}

.bg-red {
    background-color: var(--color-red);
}

.mobile-only {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 4px;
    font-weight: 600;
    font-family: var(--font-sans);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-red);
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: var(--color-red-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(196, 30, 58, 0.3);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-black);
    border-color: var(--color-black);
}

.btn-outline:hover {
    background-color: var(--color-black);
    color: #FFFFFF;
}

.btn-large {
    padding: 18px 40px;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
    display: block;
}

/* =========================================
   STICKY NAVIGATION
   ========================================= */
.sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-light);
    z-index: 1000;
    transition: var(--transition);
}

.sticky-nav.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo-img {
    height: 40px;
    object-fit: contain;
}

.logo-text-fallback {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 0.1em;
}

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

.nav-link {
    font-weight: 500;
    color: var(--color-black-light);
    transition: color 0.3s;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-red);
    transition: width 0.3s;
}

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

.nav-btn {
    background-color: var(--color-red);
    color: #FFFFFF;
    padding: 8px 20px;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition);
}

.nav-btn:hover {
    background-color: var(--color-red-hover);
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
    z-index: 1002;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--color-black);
    transition: var(--transition);
}

.mobile-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-150%);
    transition: transform 0.4s ease-in-out;
    z-index: 999;
}

.mobile-nav.open {
    transform: translateY(0);
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
}

.mobile-nav-link {
    font-size: 1.125rem;
    font-weight: 500;
    display: block;
}

.mobile-nav-btn {
    display: inline-block;
    background-color: var(--color-red);
    color: #FFFFFF;
    padding: 12px 30px;
    border-radius: 4px;
    font-weight: 600;
    margin-top: 10px;
}

/* =========================================
   COMMON SECTION STYLES
   ========================================= */
section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

/* Traditional underline effect */
.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background-color: var(--color-red);
}

.section-desc {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-top: 25px;
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

/* =========================================
   HERO SECTION
   ========================================= */
.section-hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--nav-height);
    background-color: var(--color-ivory);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at center, transparent 0%, var(--color-ivory) 100%),
        url('data:image/svg+xml;utf8,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="1" fill="%23C41E3A" opacity="0.1"/></svg>');
    background-size: cover, 30px 30px;
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-logo-wrapper {
    margin-bottom: var(--spacing-md);
    min-height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.main-logo {
    max-height: 150px;
    object-fit: contain;
}

.logo-text-fallback-large {
    font-size: 4rem;
    letter-spacing: 0.2em;
    color: var(--color-black);
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.35rem;
    color: var(--color-black-light);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
}

.hero-cta-group {
    display: flex;
    justify-content: center;
    gap: 15px;
}

/* =========================================
   WHY SECTION (BRAND PHILOSOPHY)
   ========================================= */
.why-grid {
    grid-template-columns: repeat(4, 1fr);
}

.icon-card {
    background: #FFFFFF;
    padding: var(--spacing-md);
    border-radius: 4px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 3px solid transparent;
}

.icon-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
    border-top-color: var(--color-red);
}

.icon-card .icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.card-desc {
    color: var(--color-gray);
    font-size: 0.95rem;
}

/* =========================================
   8 STRENGTHS SECTION
   ========================================= */
.strengths-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.strength-card {
    background: var(--color-ivory);
    padding: 30px 20px;
    border: 1px solid var(--color-gray-light);
    position: relative;
    transition: var(--transition);
}

.strength-card:hover {
    background: #FFFFFF;
    border-color: var(--color-red);
    box-shadow: var(--shadow-sm);
}

.strength-num {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--color-red);
    opacity: 0.2;
    position: absolute;
    top: 10px;
    right: 15px;
    font-weight: 900;
    transition: opacity 0.3s;
}

.strength-card:hover .strength-num {
    opacity: 0.5;
}

.strength-card h4 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    position: relative;
    z-index: 2;
}

.strength-card p {
    color: var(--color-black-light);
    font-size: 0.95rem;
    position: relative;
    z-index: 2;
}

/* =========================================
   PROFIT COMPARISON SECTION
   ========================================= */
.comparison-table-container {
    max-width: 900px;
    margin: 0 auto;
    background: #FFFFFF;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    text-align: center;
}

.comparison-table th,
.comparison-table td {
    padding: 20px;
    border-bottom: 1px solid var(--color-gray-light);
}

.comparison-table th {
    background-color: var(--color-black);
    color: #FFFFFF;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
}

.comparison-table th.col-highlight {
    background-color: var(--color-red);
    font-weight: 600;
    font-size: 1.4rem;
}

.comparison-table td:first-child {
    font-weight: 600;
    background-color: var(--color-ivory);
    width: 25%;
    text-align: left;
    padding-left: 30px;
}

.col-normal {
    width: 35%;
    color: var(--color-gray);
}

.col-highlight {
    width: 40%;
    background-color: rgba(196, 30, 58, 0.03);
    font-size: 1.1rem;
}

.comparison-table tfoot td {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    background-color: var(--color-ivory);
    border-bottom: none;
}

.comparison-table tfoot td.result-highlight {
    font-size: 1.75rem;
    background-color: rgba(196, 30, 58, 0.1);
}

.comparison-table small {
    display: block;
    font-size: 0.85rem;
    margin-top: 5px;
    color: var(--color-gray);
}

.col-highlight small {
    color: var(--color-red);
    opacity: 0.8;
}

/* =========================================
   STRATEGY SECTION
   ========================================= */
.split-cards-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.strategy-card {
    border: 1px solid var(--color-gray-light);
    border-radius: 8px;
    overflow: hidden;
    background: #FFFFFF;
    transition: var(--transition);
}

.strategy-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-sm);
}

.highlight-card {
    border-color: var(--color-red);
    box-shadow: 0 10px 30px rgba(196, 30, 58, 0.1);
}

.strategy-card-header {
    padding: 30px 20px;
    text-align: center;
    background-color: var(--color-ivory);
    border-bottom: 1px solid var(--color-gray-light);
}

.highlight-card .strategy-card-header {
    border-bottom: none;
}

.strategy-card-header h4 {
    font-size: 1.75rem;
    margin-bottom: 5px;
}

.strategy-card-body {
    padding: 30px;
}

.check-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 15px;
    line-height: 1.5;
}

.check-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-red);
    font-weight: bold;
    font-size: 1.1rem;
}

.check-list strong {
    color: var(--color-black);
}

.highlight-card .check-list strong {
    color: var(--color-red);
}

/* =========================================
   CONTACT SECTION & FORM
   ========================================= */
.section-contact {
    padding: var(--spacing-xl) 0 calc(var(--spacing-xl) * 1.5);
}

.contact-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.contact-desc {
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-lg);
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
    background: #FFFFFF;
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.form-row {
    margin-bottom: 20px;
}

.form-row.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-form input,
.contact-form select {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--color-gray-light);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 1rem;
    background-color: var(--color-ivory);
    color: var(--color-black);
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form select:focus {
    outline: none;
    border-color: var(--color-red);
    background-color: #FFFFFF;
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
    padding: 30px 0;
    border-top: 1px solid #222;
}

.footer p {
    font-size: 0.9rem;
    margin-bottom: 5px;
}

/* =========================================
   MOBILE BOTTOM CTA
   ========================================= */
.mobile-bottom-cta {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    padding: 10px 20px;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

/* =========================================
   MODAL STYLES
   ========================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: #fff;
    width: 90%;
    max-width: 500px;
    border-radius: 8px;
    padding: 40px 30px;
    position: relative;
    transform: translateY(30px);
    transition: transform 0.3s;
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-gray);
    transition: color 0.3s;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-black);
}

.modal-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--color-gray-light);
    padding-bottom: 15px;
}

.modal-num {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--color-red);
    font-weight: 900;
    margin-right: 15px;
    opacity: 0.3;
}

.modal-header h4 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--color-black);
}

.modal-body p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--color-black-light);
}

.strength-card {
    cursor: pointer;
}

/* =========================================
   ANIMATIONS
   ========================================= */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* =========================================
   RESPONSIVE (MOBILE OPTIMIZATION)
   ========================================= */
@media (max-width: 992px) {
    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
        --spacing-xl: 4rem;
        --spacing-lg: 3rem;
    }

    .mobile-only {
        display: block;
    }

    /* Navigation */
    .nav-menu {
        display: none;
    }

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

    /* Hero */
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-cta-group {
        flex-direction: column;
    }

    /* Grids */
    .why-grid {
        grid-template-columns: 1fr;
    }

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

    .split-cards-wrap {
        grid-template-columns: 1fr;
    }

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

    /* Table Responsive */
    .comparison-table-container {
        overflow-x: auto;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 15px 10px;
        font-size: 0.95rem;
    }

    .comparison-table th.col-highlight {
        font-size: 1.1rem;
    }

    .comparison-table td:first-child {
        padding-left: 15px;
        width: auto;
    }

    /* Form */
    .form-row.split {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .form-container {
        padding: 20px;
    }

    /* Mobile CTA */
    .mobile-bottom-cta {
        display: block;
    }

    body {
        padding-bottom: 70px;
    }
}