/**
 * MindRead Design Tokens
 * 통합 디자인 시스템 변수 정의
 *
 * 테마 사용법:
 * - 사용자 페이지: 기본 (data-theme 없음)
 * - 관리자 페이지: <html data-theme="admin">
 */

:root {
    /* ========================================
     * Brand Colors (공통 브랜드 컬러)
     * ======================================== */

    --brand-pink: #FF6B9D;
    --brand-pink-light: #FFB8D0;
    --brand-pink-dark: #E84A7B;

    --brand-purple: #9D8DF1;
    --brand-purple-light: #B8ACFF;
    --brand-purple-dark: #7B6AD9;

    --brand-indigo: #6366F1;
    --brand-indigo-light: #818CF8;
    --brand-indigo-dark: #4F46E5;

    --brand-yellow: #FFD93D;

    /* ========================================
     * Semantic Colors (공통)
     * ======================================== */

    --color-success: #10B981;
    --color-success-light: #34D399;
    --color-warning: #F59E0B;
    --color-warning-light: #FBBF24;
    --color-error: #EF4444;
    --color-error-light: #F87171;
    --color-info: #3B82F6;
    --color-info-light: #60A5FA;

    /* ========================================
     * User Theme (Light/Pink) - Default
     * ======================================== */

    /* Primary */
    --color-primary: var(--brand-pink);
    --color-primary-light: var(--brand-pink-light);
    --color-primary-dark: var(--brand-pink-dark);
    --color-primary-rgb: 255, 107, 157;

    /* Secondary */
    --color-secondary: var(--brand-purple);
    --color-secondary-light: var(--brand-purple-light);
    --color-secondary-dark: var(--brand-purple-dark);

    /* Accent */
    --color-accent: var(--brand-yellow);

    /* Background */
    --color-bg: #FFF9F5;
    --color-bg-alt: #FFF0F5;
    --color-bg-subtle: #F3EEFF;
    --color-bg-card: rgba(255, 255, 255, 0.95);
    --color-bg-overlay: rgba(0, 0, 0, 0.5);

    /* Text */
    --color-text: #2D2D3A;
    --color-text-secondary: #4A4A5A;
    --color-text-muted: #6B6B7B;
    --color-text-subtle: #9B9BAB;
    --color-text-inverse: #FFFFFF;

    /* Border */
    --color-border: rgba(255, 107, 157, 0.15);
    --color-border-subtle: rgba(0, 0, 0, 0.06);
    --color-border-focus: var(--brand-pink);

    /* Shadow */
    --shadow-color: rgba(255, 107, 157, 0.1);

    /* ========================================
     * Legacy Compatibility (기존 변수명 호환)
     * ======================================== */

    --primary: var(--color-primary);
    --primary-light: var(--color-primary-light);
    --secondary: var(--color-secondary);
    --accent: var(--color-accent);
    --bg-cream: var(--color-bg);
    --bg-pink: var(--color-bg-alt);
    --bg-purple: var(--color-bg-subtle);
    --text-dark: var(--color-text);
    --text-light: var(--color-text-muted);

    /* ========================================
     * Typography
     * ======================================== */

    --font-sans: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif KR', 'Playfair Display', Georgia, serif;
    --font-display: 'Playfair Display', Georgia, serif;

    --text-xs: 11px;
    --text-sm: 13px;
    --text-base: 15px;
    --text-lg: 17px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 28px;
    --text-4xl: 36px;
    --text-5xl: 48px;

    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* ========================================
     * Spacing
     * ======================================== */

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;

    /* ========================================
     * Border Radius
     * ======================================== */

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* ========================================
     * Shadows
     * ======================================== */

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
    --shadow-primary: 0 8px 24px var(--shadow-color);

    /* ========================================
     * Transitions
     * ======================================== */

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* ========================================
     * Z-Index
     * ======================================== */

    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;

    /* ========================================
     * Layout
     * ======================================== */

    --container-sm: 540px;
    --container-md: 720px;
    --container-lg: 960px;
    --container-xl: 1140px;
}

/* ========================================
 * Admin Theme (Dark/Indigo)
 * <html data-theme="admin"> 로 활성화
 * ======================================== */

[data-theme="admin"] {
    /* Primary - Indigo */
    --color-primary: var(--brand-indigo);
    --color-primary-light: var(--brand-indigo-light);
    --color-primary-dark: var(--brand-indigo-dark);
    --color-primary-rgb: 99, 102, 241;

    /* Secondary - Purple (공유) */
    --color-secondary: var(--brand-purple);

    /* Accent - Pink (브랜드 연결) */
    --color-accent: var(--brand-pink);

    /* Background - Dark */
    --color-bg: #0a0a0f;
    --color-bg-alt: #13131a;
    --color-bg-subtle: #1a1a25;
    --color-bg-card: rgba(255, 255, 255, 0.02);
    --color-bg-overlay: rgba(0, 0, 0, 0.8);

    /* Text - Light on Dark */
    --color-text: #FFFFFF;
    --color-text-secondary: rgba(255, 255, 255, 0.8);
    --color-text-muted: rgba(255, 255, 255, 0.6);
    --color-text-subtle: rgba(255, 255, 255, 0.4);
    --color-text-inverse: #0a0a0f;

    /* Border - Subtle */
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-subtle: rgba(255, 255, 255, 0.06);
    --color-border-focus: var(--brand-indigo);

    /* Shadow */
    --shadow-color: rgba(99, 102, 241, 0.2);

    /* Legacy */
    --primary: var(--color-primary);
    --primary-light: var(--color-primary-light);
    --bg-cream: var(--color-bg);
    --text-dark: var(--color-text);
    --text-light: var(--color-text-muted);
}

/* ========================================
 * Common Reset & Base Styles
 * ======================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background: var(--color-bg);
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* ========================================
 * Common Utility Classes
 * ======================================== */

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }
.text-center { text-align: center; }

.bg-primary { background: var(--color-bg); }
.bg-alt { background: var(--color-bg-alt); }
.bg-card { background: var(--color-bg-card); }

/* ========================================
 * Common Component Styles
 * ======================================== */

/* Primary Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    cursor: pointer;
    box-shadow: var(--shadow-primary);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px var(--shadow-color);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Secondary Button */
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    background: var(--color-bg-card);
    color: var(--color-primary);
    border: 2px solid var(--color-primary-light);
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-secondary:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-primary);
}

/* Card Component */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
}

/* Loading Spinner */
.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-primary-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--space-4) var(--space-6);
    background: var(--color-text);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: var(--z-tooltip);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-error); }
.toast.warning { background: var(--color-warning); }
.toast.info { background: var(--color-info); }

/* ========================================
 * Common Animations
 * ======================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.animate-fade-in { animation: fadeIn var(--transition-normal) ease-out; }
.animate-fade-in-up { animation: fadeInUp var(--transition-slow) ease-out; }
.animate-fade-in-down { animation: fadeInDown var(--transition-slow) ease-out; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }

/* ========================================
 * Skeleton Loading System
 * ======================================== */

.skeleton {
    background: linear-gradient(90deg, var(--color-bg-subtle) 25%, var(--color-bg-alt) 50%, var(--color-bg-subtle) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* Skeleton 컨테이너 - 실제 콘텐츠 숨김 */
.skeleton-container {
    position: relative;
}

.skeleton-container.loading > *:not(.skeleton-overlay) {
    visibility: hidden;
}

.skeleton-container.loading .skeleton-overlay {
    display: block;
}

.skeleton-overlay {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

/* Skeleton 텍스트 라인 */
.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: var(--radius-sm);
}

.skeleton-text.title {
    height: 1.5em;
    width: 70%;
}

.skeleton-text.subtitle {
    height: 1.2em;
    width: 50%;
}

.skeleton-text.short {
    width: 30%;
}

.skeleton-text.medium {
    width: 60%;
}

.skeleton-text.long {
    width: 90%;
}

/* Skeleton 아바타/이미지 */
.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
}

.skeleton-avatar.sm {
    width: 32px;
    height: 32px;
}

.skeleton-avatar.lg {
    width: 64px;
    height: 64px;
}

.skeleton-image {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
}

.skeleton-image.square {
    aspect-ratio: 1;
}

.skeleton-image.portrait {
    aspect-ratio: 3/4;
}

/* Skeleton 카드 */
.skeleton-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* 스토리 카드 Skeleton */
.skeleton-story-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.skeleton-story-card .skeleton-image {
    border-radius: 0;
    aspect-ratio: 4/3;
}

.skeleton-story-card .skeleton-content {
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* 버튼 Skeleton */
.skeleton-button {
    height: 44px;
    width: 120px;
    border-radius: var(--radius-full);
}

.skeleton-button.full {
    width: 100%;
}

/* Skeleton 그리드 */
.skeleton-grid {
    display: grid;
    gap: var(--space-4);
}

.skeleton-grid.cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.skeleton-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 767px) {
    .skeleton-grid.cols-2,
    .skeleton-grid.cols-3 {
        grid-template-columns: 1fr;
    }
}

/* Skeleton 애니메이션 지연 (stagger effect) */
.skeleton-card:nth-child(1),
.skeleton-story-card:nth-child(1) { animation-delay: 0s; }
.skeleton-card:nth-child(2),
.skeleton-story-card:nth-child(2) { animation-delay: 0.1s; }
.skeleton-card:nth-child(3),
.skeleton-story-card:nth-child(3) { animation-delay: 0.2s; }
.skeleton-card:nth-child(4),
.skeleton-story-card:nth-child(4) { animation-delay: 0.3s; }
.skeleton-card:nth-child(5),
.skeleton-story-card:nth-child(5) { animation-delay: 0.4s; }
.skeleton-card:nth-child(6),
.skeleton-story-card:nth-child(6) { animation-delay: 0.5s; }

/* 콘텐츠 로드 완료 시 fade-in */
.skeleton-container:not(.loading) > *:not(.skeleton-overlay) {
    animation: fadeIn 0.3s ease-out;
}

/* ========================================
 * Image Optimization Utilities
 * ======================================== */

/* 반응형 이미지 컨테이너 */
.img-container {
    position: relative;
    overflow: hidden;
}

.img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Lazy loading 상태 */
.img-container img[loading="lazy"] {
    opacity: 0;
}

.img-container img[loading="lazy"].loaded {
    opacity: 1;
}

/* 이미지 로딩 플레이스홀더 */
.img-placeholder {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, var(--color-bg-subtle) 25%, var(--color-bg-alt) 50%, var(--color-bg-subtle) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.img-container img.loaded + .img-placeholder {
    opacity: 0;
    pointer-events: none;
}

/* 고정 비율 이미지 */
.aspect-square { aspect-ratio: 1; }
.aspect-video { aspect-ratio: 16/9; }
.aspect-portrait { aspect-ratio: 3/4; }
.aspect-story { aspect-ratio: 3/4; }

/* 이미지 오버레이 */
.img-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-overlay);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.img-container:hover .img-overlay {
    opacity: 1;
}

/* 줌 효과 */
.img-hover-zoom:hover img {
    transform: scale(1.05);
}

/* 블러 로딩 (LQIP - Low Quality Image Placeholder) */
.img-blur-load {
    filter: blur(10px);
    transition: filter 0.5s ease;
}

.img-blur-load.loaded {
    filter: blur(0);
}

/* 반응형 이미지 크기 */
@media (max-width: 767px) {
    .img-responsive-sm {
        max-width: 100%;
        height: auto;
    }
}

@media (min-width: 768px) {
    .img-responsive-md {
        max-width: 100%;
        height: auto;
    }
}
