/* ============================================
   CSS Variables (Theme)
   ============================================ */
:root {
    /* Precision Flow theme */
    --color-primary: #0b3158;
    --color-primary-light: #176bbd;
    --color-primary-dark: #071a33;
    --color-accent: #21b6d7;
    --color-accent-hover: #1495b4;
    --color-bg: #ffffff;
    --color-bg-alt: #f1f7f9;
    --color-bg-dark: #071a33;
    --color-text: #18242d;
    --color-text-light: #52636f;
    --color-text-inverse: #ffffff;
    --color-border: #eeeeee;
    --color-border-medium: #cccccc;
    --color-success: #38a169;
    --color-error: #e53e3e;
    --color-warning: #d69e2e;

    /* Typography */
    --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-hero: 5.625rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6.25rem;
    --spacing-5xl: 9.375rem;

    /* Layout */
    --container-max: 1440px;
    --nav-height: 80px;
    --border-radius: 6px;
    --border-radius-lg: 12px;
    --border-radius-xl: 18px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 9px 35px rgba(64, 64, 64, 0.3);
    --shadow-pub: 0 2px 17px rgba(51, 51, 51, 0.17);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease-in-out;
}

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

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

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

.skip-link {
    position: fixed;
    left: 1rem;
    top: -4rem;
    z-index: 9999;
    padding: 0.75rem 1rem;
    background: #fff;
    color: var(--color-primary);
    border-radius: var(--border-radius);
}

.skip-link:focus { top: 1rem; }

.empty-state {
    padding: var(--spacing-xl);
    color: var(--color-text-light);
    text-align: center;
}

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

a:hover {
    color: var(--color-accent-hover);
}

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
    color: var(--color-primary);
}

/* ============================================
   Layout Utilities
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.main-content {
    min-height: calc(100vh - var(--nav-height) - 200px);
    padding-top: var(--nav-height);
}

.main-content-home {
    padding-top: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--color-bg);
    color: var(--color-text);
    text-align: center;
}

.btn:hover {
    background: var(--color-bg-alt);
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    color: var(--color-text-inverse);
}

.btn-danger {
    background: var(--color-error);
    color: var(--color-text-inverse);
    border-color: var(--color-error);
}

.btn-danger:hover {
    background: #c53030;
    color: var(--color-text-inverse);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

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

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.15);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* ============================================
   Flash Messages
   ============================================ */
.flash {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

.flash-success {
    background: #f0fff4;
    color: var(--color-success);
    border: 1px solid #c6f6d5;
}

.flash-error {
    background: #fff5f5;
    color: var(--color-error);
    border: 1px solid #fed7d7;
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-2xl);
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.pagination-link:hover,
.pagination-link.active {
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-color: var(--color-accent);
}

/* ============================================
   Section
   ============================================ */
.section {
    padding: var(--spacing-4xl) 0;
    position: relative;
}

.section-label {
    color: var(--color-primary);
    font-size: 24px;
    font-weight: 700;
    line-height: 1;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: 70px;
    line-height: 0.9;
    margin-bottom: 0;
    color: var(--color-text);
}

.section-header {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    margin-bottom: var(--spacing-3xl);
}

.section-more {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.btn-more {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
    position: relative;
}

/* 누름 영역만 44px 안팎으로 넓힌다(보이는 크기는 그대로) */
.btn-more::after { content: ''; position: absolute; inset: -11px -4px; }

.btn-more .btn-more-icon {
    display: flex;
    width: 21px;
    height: 21px;
    border-radius: 50%;
    background-color: var(--color-accent);
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.btn-more .btn-more-icon svg {
    width: 11px;
    height: 11px;
    fill: none;
    stroke: var(--color-text-inverse);
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

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

.btn-more:hover .btn-more-icon {
    animation: btnArrow 0.5s infinite alternate;
}

@keyframes btnArrow {
    0% { transform: translateX(0); }
    100% { transform: translateX(8px); }
}

.page-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-primary);
}

/* ============================================
   Card Grid
   ============================================ */
.card-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.card-grid-1 { grid-template-columns: 1fr; max-width: 600px; margin: 0 auto; }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

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

.card-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-image-round img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: var(--spacing-lg) auto 0;
    object-fit: cover;
}

.card-body {
    padding: var(--spacing-lg);
    text-align: center;
}

.card-body h3,
.card-body h4 {
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Filter
   ============================================ */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.filter-bar select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .card-grid-3 { grid-template-columns: 1fr; }
    .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .form-row { flex-direction: column; }
    /* 머리말(80px) 아래 위 여백 100px 는 휴대폰·태블릿 세로에서 첫 글을 너무 아래로 밀었다 */
    .section { padding: var(--spacing-3xl) 0; }
}

@media (max-width: 520px) {
    .section { padding: var(--spacing-2xl) 0; }
}