/* ===================================
   대용량봉지(MIMIC) 퍼스널 브랜딩 웹사이트
   jvibeschool.com 스타일 기반 디자인
   =================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,300;14..32,400;14..32,500;14..32,600;14..32,700;14..32,800;14..32,900&display=swap');

/* --- CSS Variables (Design Tokens) --- */
:root {
    /* Colors - Dark Mode (Default) */
    --color-bg-dark: #0a0a0f;
    --color-bg-section: #0f0f18;
    --color-bg-card: rgba(20, 20, 35, 0.6);
    --color-bg-card-hover: rgba(30, 30, 50, 0.8);

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-accent: #22c55e;
    --color-accent-glow: rgba(34, 197, 94, 0.4);

    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;
    --font-size-hero: clamp(3rem, 8vw, 6rem);

    /* 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: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-card-hover: 0 8px 40px rgba(99, 102, 241, 0.2);
}

/* --- Light Mode --- */
[data-theme="light"] {
    --color-bg-dark: #f8fafc;
    --color-bg-section: #ffffff;
    --color-bg-card: rgba(255, 255, 255, 0.9);
    --color-bg-card-hover: rgba(241, 245, 249, 1);

    --color-primary: #4f46e5;
    --color-primary-light: #6366f1;
    --color-accent: #16a34a;
    --color-accent-glow: rgba(22, 163, 74, 0.3);

    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;

    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-hover: rgba(0, 0, 0, 0.15);

    --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.15);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 8px 40px rgba(79, 70, 229, 0.12);
}

/* Light mode specific adjustments */
[data-theme="light"] .bg-gradient {
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(34, 197, 94, 0.05), transparent),
        var(--color-bg-dark);
}

[data-theme="light"] .bg-grid {
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
}

[data-theme="light"] .hero-title {
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .hero-image {
    border-color: rgba(79, 70, 229, 0.4);
    box-shadow: 0 0 60px rgba(79, 70, 229, 0.2);
}

[data-theme="light"] .nav {
    background: rgba(248, 250, 252, 0.9);
}

[data-theme="light"] .tag,
[data-theme="light"] .skill-tag {
    background: rgba(79, 70, 229, 0.1);
    border-color: rgba(79, 70, 229, 0.25);
    color: var(--color-primary);
}

/* 그라데이션 배경을 가진 하이라이트 태그는 흰색 글자 유지 */
[data-theme="light"] .skill-tag.highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-color: transparent;
    color: #ffffff;
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

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

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* --- Layout Utilities --- */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section {
    padding: var(--spacing-4xl) 0;
}

/* --- Background Effects --- */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(34, 197, 94, 0.08), transparent),
        var(--color-bg-dark);
}

.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-lg) 0;
    background: rgba(10, 10, 15, 0.8);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.nav-logo img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

[data-theme="light"] .theme-toggle {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
    display: none;
}

[data-theme="light"] .theme-toggle .icon-sun {
    display: block;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 15, 0.98);
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 100px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    padding: var(--spacing-xl);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease;
}

.hero-badge::before {
    content: '⚡';
}

.hero-image {
    width: 180px;
    height: 180px;
    margin: 0 auto var(--spacing-xl);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 4px solid rgba(99, 102, 241, 0.3);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.3);
    animation: floatAnimation 4s ease-in-out infinite, fadeInUp 0.8s ease 0.2s both;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary-light) 50%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 400;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.5s both;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-text-primary);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--color-accent), #16a34a);
    color: var(--color-text-primary);
    box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-accent:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--color-accent-glow);
}

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

/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.section-desc {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Project Cards --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
}

.project-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-md);
    font-size: var(--font-size-xl);
}

.card-category {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.card-desc {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary-light);
}

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

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-accent);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

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

.card-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.card-link:hover svg {
    transform: translateX(4px);
}

/* Coming Soon Card */
.project-card.coming-soon {
    opacity: 0.6;
    cursor: default;
}

.project-card.coming-soon:hover {
    transform: none;
    box-shadow: none;
}

/* --- Personal Links Section --- */
.links-section {
    background: var(--color-bg-section);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.link-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.link-card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    transform: translateX(8px);
}

.link-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.link-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.link-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
    padding: var(--spacing-3xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer-cta {
    margin-top: var(--spacing-md);
}

.footer-copyright {
    margin-top: var(--spacing-xl);
}

.font-license {
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    line-height: 1.6;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes floatAnimation {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-15px);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    :root {
        --font-size-hero: clamp(2.5rem, 6vw, 4rem);
        --font-size-4xl: 2rem;
    }

    .hero-image {
        width: 140px;
        height: 140px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-3xl) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .links-grid {
        grid-template-columns: 1fr;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-light);
}