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

:root {
    /* Slate 색상 팔레트 - 세련된 중성 톤 */
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;

    /* 주요 색상 - 파란색 대신 Slate 사용 */
    --color-primary: #334155;          /* slate-700: 메인 강조색 */
    --color-primary-hover: #1e293b;    /* slate-800: 호버 상태 */
    --color-primary-light: #64748b;    /* slate-500: 밝은 강조 */

    /* 상태 색상 */
    --color-error: #b91c1c;            /* 차분한 레드 */
    --color-success: #15803d;          /* 차분한 그린 */
    --color-warning: #a16207;          /* 차분한 앰버 */

    /* 배경 색상 - 흰색 기반 */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;     /* slate-50: 미세한 회색 */
    --color-bg-tertiary: #f1f5f9;      /* slate-100 */

    /* 텍스트 색상 */
    --color-text: #1e293b;             /* slate-800: 메인 텍스트 */
    --color-text-secondary: #64748b;   /* slate-500: 보조 텍스트 */
    --color-text-muted: #94a3b8;       /* slate-400: 뮤트된 텍스트 */

    /* 테두리 색상 */
    --color-border: #e2e8f0;           /* slate-200 */
    --color-border-strong: #cbd5e1;    /* slate-300 */

    /* 사이드바 */
    --left-width: 16rem;
    --left-bg: #ffffff;                /* 흰색 배경 */
    --left-border: #e2e8f0;
    --left-hover: #f1f5f9;             /* slate-100 */
    --left-active: #e2e8f0;            /* slate-200 */

    /* 전환 효과 */
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 링크 스타일 - 파란색 대신 Slate 사용 */
a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* 밑줄 강조 링크 스타일 (선택적 사용) */
.link-underline {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-color: var(--slate-300);
    text-underline-offset: 2px;
}

.link-underline:hover {
    text-decoration-color: var(--color-primary);
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
    background: var(--color-bg);
}

/* Buttons - Slate 기반 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--color-border-strong);
    color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-secondary);
    border-color: var(--slate-400);
}

/* 아웃라인 버튼 */
.btn-outline {
    background: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--color-primary);
    color: white;
}

/* 고스트 버튼 */
.btn-ghost {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.btn-block {
    width: 100%;
}

/* Button Sizes */
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* Alert - 차분한 색상 */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.alert-error {
    background: #fef2f2;
    color: var(--color-error);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background: #fffbeb;
    color: var(--color-warning);
    border: 1px solid #fde68a;
}

.alert-info {
    background: var(--slate-50);
    color: var(--slate-700);
    border: 1px solid var(--slate-200);
}

/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);  /* slate-900 with opacity */
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    backdrop-filter: blur(2px);
}

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

@media (min-width: 768px) {
    .overlay {
        display: none;
    }
}

/* Focus States - 파란색 대신 Slate */
:focus-visible {
    outline: 2px solid var(--slate-400);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--slate-200);
    color: var(--slate-900);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--slate-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--slate-400);
}

/* ============================================================
   Pagination 공통 스타일
   ============================================================ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    padding: 12px 0;
    max-width: 1200px;
    margin: 0 auto;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    padding: 0 6px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 12px;
    transition: all 0.15s;
}

.pagination a {
    color: var(--slate-600);
    background: white;
    border: 1px solid var(--slate-200);
}

.pagination a:hover {
    background: var(--slate-50);
    border-color: var(--slate-300);
}

.pagination .active,
.pagination span.active,
.pagination .current-page {
    background: var(--slate-800);
    border: 1px solid var(--slate-800);
    color: white;
    font-weight: 600;
}

.pagination .disabled,
.pagination span.disabled {
    color: var(--slate-300);
    background: white;
    border: 1px solid var(--slate-200);
    cursor: not-allowed;
    pointer-events: none;
}

.pagination .page-link {
    color: var(--slate-600);
    background: white;
    border: 1px solid var(--slate-200);
}

.pagination .page-link:hover {
    background: var(--slate-50);
    border-color: var(--slate-300);
}

/* Pagination 반응형 */
@media (max-width: 640px) {
    .pagination {
        gap: 2px;
        padding: 8px 0;
    }

    .pagination a,
    .pagination span {
        min-width: 24px;
        height: 24px;
        padding: 0 4px;
        font-size: 11px;
    }
}