:root {
    --color-primary: #1B4F8A;
    --color-primary-dark: #133970;
    --color-primary-light: #2E5FA3;
    --color-accent: #C9A227;
    --color-cta: #E05A2B;
    --color-cta-dark: #D45A1F;
    --color-bg: #F7F9FC;
    --color-text: #1A1A2E;
    --color-text-muted: #5A6A7A;
    --color-border: #D8E2EE;
    --color-success: #2E7D32;
    --color-warning: #F57C00;
    --color-danger: #C62828;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    font-family: 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
}

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

body {
    color: var(--color-text);
    background-color: #fff;
    line-height: 1.75;
    font-size: clamp(0.875rem, 2.5vw, 1rem);
}

/* 버튼 스타일 */
.btn {
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    padding: 0.625rem 1.5rem;
    font-size: 1rem;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    box-shadow: 0 4px 12px rgba(27, 79, 138, 0.25);
}

.btn-warning {
    background-color: var(--color-cta);
    border-color: var(--color-cta);
    color: white;
}

.btn-warning:hover {
    background-color: var(--color-cta-dark);
    border-color: var(--color-cta-dark);
    box-shadow: 0 4px 12px rgba(224, 90, 43, 0.25);
}

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

.btn-outline-primary:hover {
    background-color: var(--color-primary);
    color: white;
}

/* 배경 및 텍스트 */
.bg-primary {
    background-color: var(--color-primary) !important;
}

.bg-primary-light {
    background-color: #E8F1F8 !important;
}

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

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

/* 히어로 섹션 */
.hero-section {
    padding: clamp(2rem, 15vh, 5rem) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.hero-section h1 {
    font-size: clamp(1.5rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* 카드 스타일 */
.card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-title {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

/* 네비게이션 */
.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary) !important;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    background-color: white;
    padding: var(--spacing-md) 0;
}

.navbar.sticky {
    position: sticky;
    top: 0;
    z-index: 999;
}

.nav-link {
    color: var(--color-text) !important;
    font-weight: 500;
    transition: color var(--transition-fast);
    margin: 0 var(--spacing-sm);
}

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

.nav-link.active {
    color: var(--color-cta) !important;
}

/* 모바일 CTA 바 */
.mobile-cta-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 2px solid var(--color-border);
    padding: var(--spacing-md);
    z-index: 1000;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
}

.btn-kakao-mobile {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background: #FFE812;
    color: #000;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background var(--transition-fast);
}

.btn-kakao-mobile:hover {
    background: #FDD835;
    text-decoration: none;
}

.btn-kakao-mobile:active {
    transform: scale(0.98);
}

/* 페이지 스페이싱 */
body.with-mobile-cta {
    padding-bottom: 70px;
}

/* 섹션 */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

/* 배지 */
.badge {
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-success {
    background-color: #E8F5E9;
    color: var(--color-success);
}

/* 폼 요소 */
.form-control, .form-select {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.625rem 1rem;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-control:focus, .form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(27, 79, 138, 0.1);
}

/* 이미지 최적화 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

img[loading="lazy"] {
    background-color: #f0f0f0;
}

/* 타이포그래피 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text);
}

h1 { font-size: clamp(1.75rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--color-cta);
    text-decoration: underline;
}

/* 리스트 */
.list-group-item {
    border-color: var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
}

/* 모달 */
.modal-content {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.16);
}

.modal-header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xl);
}

.modal-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl);
}

/* 탭 */
.nav-tabs .nav-link {
    color: var(--color-text-muted);
    border-bottom: 3px solid transparent;
    margin-bottom: -3px;
    padding: var(--spacing-md) var(--spacing-lg);
}

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

.nav-tabs .nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background-color: transparent;
}

/* 페이지네이션 */
.pagination .page-link {
    border-color: var(--color-border);
    color: var(--color-primary);
}

.pagination .page-link:hover {
    background-color: var(--color-bg);
    border-color: var(--color-border);
}

.pagination .page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* 반응형 — 태블릿 이상 */
@media (min-width: 768px) {
    .container {
        max-width: 960px;
    }
}

/* 반응형 — 모바일 (375px ~) */
@media (max-width: 767.98px) {
    .hero-section {
        padding-top: 2rem;
        padding-bottom: 2rem;
    }

    .section {
        padding: 1.5rem 0;
    }

    .card-body {
        padding: 1rem;
    }

    .modal {
        padding: 0 !important;
    }

    .modal-dialog {
        margin: 0.5rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.95rem;
    }

    .nav-link {
        padding: 0.5rem 0.75rem !important;
        margin: 0 !important;
    }

    .section-title {
        font-size: 1.5rem;
    }
}

/* 초소형 화면 (max 375px) */
@media (max-width: 375px) {
    html {
        font-size: 14px;
    }

    .hero-section h1 {
        font-size: 1.25rem;
    }

    .card {
        margin-bottom: 1rem;
    }

    .container-fluid {
        padding-left: 0.75rem;
        padding-right: 0.75rem;
    }
}

/* 도움말 텍스트 */
.form-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}