/**
 * NobleAIWork Homepage Main Stylesheet
 * Version: 1.0.0
 * Author: NobleAIWork Development Team
 */

/* ========================================
   1. CSS Variables / Custom Properties
======================================== */
:root {
    /* Brand Colors - NobleAI Work CI 컬러 */
    --noble-primary: #1e3a5f;        /* 메인 네이비 블루 */
    --noble-primary-dark: #152c4a;   /* 진한 네이비 */
    --noble-primary-light: #2c4f7c;  /* 연한 네이비 */
    --noble-gold: #d4af37;           /* 골드 - 프리미엄 */
    --noble-gold-dark: #b8941f;      /* 진한 골드 */
    --noble-gold-light: #e4c563;     /* 연한 골드 */
    --noble-ai-blue: #5e9ed6;        /* AI 블루 */
    --noble-secondary: #7B68EE;
    --noble-success: #28a745;
    --noble-info: #17a2b8;
    --noble-warning: #ffc107;
    --noble-danger: #dc3545;
    --noble-light: #f8f9fa;
    --noble-dark: #343a40;
    
    /* Gray Scale */
    --noble-gray-100: #f8f9fa;
    --noble-gray-200: #e9ecef;
    --noble-gray-300: #dee2e6;
    --noble-gray-400: #ced4da;
    --noble-gray-500: #adb5bd;
    --noble-gray-600: #6c757d;
    --noble-gray-700: #495057;
    --noble-gray-800: #343a40;
    --noble-gray-900: #212529;
    
    /* Gradients - CI 컬러 기반 */
    --noble-gradient: linear-gradient(135deg, #1e3a5f 0%, #2c4f7c 100%);
    --noble-gradient-dark: linear-gradient(135deg, #152c4a 0%, #1e3a5f 100%);
    --noble-gradient-gold: linear-gradient(135deg, #d4af37 0%, #e4c563 100%);
    
    /* Typography */
    --font-primary: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --radius-round: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   2. Base Styles / Reset
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--noble-gray-800);
    background-color: #fff;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   3. Typography
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--noble-gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
    line-height: 1.7;
}

.text-gradient {
    background: var(--noble-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   4. Navigation / Header
======================================== */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 1rem 0;
    transition: all var(--transition-base);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar-scrolled {
    padding: 0.5rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    margin-left: 0;
    color: var(--noble-primary) !important;
    text-decoration: none;
}

.navbar-nav .nav-link {
    color: var(--noble-gray-700);
    font-weight: 500;
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    transition: all var(--transition-fast);
    position: relative;
}

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

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--noble-gradient);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 80%;
}

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    animation: fadeInDown 0.3s ease;
}

.dropdown-item {
    padding: 0.5rem 1.5rem;
    color: var(--noble-gray-700);
    font-weight: 400;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--noble-gradient);
    color: #fff;
}

/* Mobile Menu Toggle */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    width: 24px;
    height: 20px;
}

/* ========================================
   5. Hero Section
======================================== */
.hero-section {
    background-image: url('/images/main_banner_background.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 120px 0 80px;
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 58, 95, 0.6);
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: #d1d5db;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    animation: fadeInUp 1.2s ease;
}

.hero-image {
    animation: fadeInRight 1s ease;
}

/* ========================================
   6. Section Styles
======================================== */
.section-padding {
    padding: 80px 0;
}

.section-padding-sm {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--noble-gray-900);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--noble-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   7. Cards
======================================== */
.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    height: 100%;
}

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

.service-card {
    padding: 2rem;
    text-align: center;
    background: #fff;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--noble-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--noble-gradient);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: #fff;
    transition: all var(--transition-base);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

/* ========================================
   8. Buttons
======================================== */
.btn {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-block;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--noble-gradient);
    color: #fff;
    border: none;
}

.btn-primary:hover {
    background: var(--noble-gradient-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(74, 144, 226, 0.3);
}

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

.btn-outline-primary:hover {
    background: var(--noble-primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-white {
    background: #fff;
    color: var(--noble-primary);
}

.btn-white:hover {
    background: var(--noble-gray-100);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* ========================================
   9. Forms
======================================== */
.form-control,
.form-select {
    border: 1px solid var(--noble-gray-300);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--noble-primary);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
    outline: none;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--noble-gray-700);
}

.form-check-input:checked {
    background-color: var(--noble-primary);
    border-color: var(--noble-primary);
}

/* ========================================
   10. Footer
======================================== */
.footer {
    background: var(--noble-gray-900);
    color: var(--noble-gray-400);
    padding: 60px 0 20px;
}

.footer-widget h4 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-widget ul {
    list-style: none;
    padding: 0;
}

.footer-widget ul li {
    margin-bottom: 0.75rem;
}

.footer-widget ul li a {
    color: var(--noble-gray-400);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-widget ul li a:hover {
    color: var(--noble-primary);
    padding-left: 5px;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--noble-gradient);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 20px 0;
    margin-top: 40px;
}

/* ========================================
   11. Animations
======================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.animate-fadeIn { animation: fadeIn 1s ease; }
.animate-fadeInUp { animation: fadeInUp 1s ease; }
.animate-fadeInDown { animation: fadeInDown 1s ease; }
.animate-fadeInLeft { animation: fadeInLeft 1s ease; }
.animate-fadeInRight { animation: fadeInRight 1s ease; }
.animate-pulse { animation: pulse 2s infinite; }

/* ========================================
   12. Utilities
======================================== */
.bg-gradient {
    background: var(--noble-gradient);
}

.bg-light-gradient {
    background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
}

.text-gradient {
    background: var(--noble-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-circle { border-radius: var(--radius-round); }

/* Spacing Utilities */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.pt-1 { padding-top: var(--spacing-xs); }
.pt-2 { padding-top: var(--spacing-sm); }
.pt-3 { padding-top: var(--spacing-md); }
.pt-4 { padding-top: var(--spacing-lg); }
.pt-5 { padding-top: var(--spacing-xl); }

.pb-1 { padding-bottom: var(--spacing-xs); }
.pb-2 { padding-bottom: var(--spacing-sm); }
.pb-3 { padding-bottom: var(--spacing-md); }
.pb-4 { padding-bottom: var(--spacing-lg); }
.pb-5 { padding-bottom: var(--spacing-xl); }

/* ========================================
   13. Responsive Design
======================================== */
@media (max-width: 1199px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        color: #d1d5db;
    }
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 991px) {
    .navbar-nav {
        padding: 1rem 0;
    }
    .navbar-nav .nav-link {
        padding: 0.5rem 0;
        margin: 0;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-section {
        padding: 100px 0 60px;
    }
    .section-padding {
        padding: 60px 0;
    }
}

@media (max-width: 767px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .hero-title {
        font-size: 1.75rem;
    }
    .hero-subtitle {
        font-size: 1rem;
        color: #d1d5db;
    }
    .section-title {
        font-size: 1.75rem;
    }
    .section-padding {
        padding: 40px 0;
    }
    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 575px) {
    .hero-title {
        font-size: 1.5rem;
    }
    .container {
        padding: 0 20px;
    }
}

/* ========================================
   14. Print Styles
======================================== */
@media print {
    .navbar,
    .footer,
    .btn,
    .no-print {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    .container {
        width: 100%;
        max-width: none;
    }
}

/* ========================================
   15. Accessibility
======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

:focus {
    outline: 2px solid var(--noble-primary);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--noble-primary);
    color: #fff;
    padding: 8px;
    z-index: 100;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --noble-primary: #0066cc;
        --noble-secondary: #6633cc;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Dark Mode Support (Optional) */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here if needed */
}

/* ========================================
   16. Custom Header Styles
======================================== */
.navbar {
    min-height: 70px;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-size: 1.5rem;
    letter-spacing: -0.5px;
    text-decoration: none;
    margin-left: 0;
}

.navbar-brand:hover {
    transform: scale(1.05);
    transition: transform 0.3s ease;
}

.nav-link {
    font-weight: 500;
    color: #333 !important;
    transition: all 0.3s ease;
    position: relative;
    text-decoration: none !important;  /* 밑줄 제거 */
}

.nav-link:hover {
    color: #1e3a5f !important;
    text-decoration: none !important;  /* 호버시에도 밑줄 제거 */
}

/* Active 상태 스타일 */
.nav-link.active {
    color: #1e3a5f !important;
}

/* Active 상태 밑줄 - 네비게이션 아이템에만 적용 */
.navbar-nav > .nav-item > .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -10px;  /* 위치 조정 */
    left: 50%;
    transform: translateX(-50%);
    width: 60%;  /* 너비 조정 */
    height: 3px;
    background: #d4af37;
}

/* 드롭다운 토글에는 밑줄 적용하지 않음 */
.navbar-nav > .nav-item.dropdown > .nav-link.active::after {
    display: none;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 8px;
    margin-top: 10px;
}

.dropdown-item {
    padding: 10px 20px;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background: rgba(30, 58, 95, 0.05);
    color: #1e3a5f;
    padding-left: 25px;
}

.btn-primary {
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #152c4a !important;
    border-color: #152c4a !important;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(30, 58, 95, 0.3);
}

/* Mobile Menu Adjustments */
@media (max-width: 991px) {
    .navbar-collapse {
        background: white;
        margin-top: 15px;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    }
    
    .nav-link {
        padding: 10px 15px !important;
    }
    
    .nav-link.active::after {
        display: none;
    }
    
    .navbar-nav .btn {
        width: 100%;
        margin-top: 15px;
    }
}