/* ============================================
   Reset & Variables
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Blue Palette */
    --blue-50: #e8f0f5;
    --blue-100: #c9dce8;
    --blue-200: #a3c4d6;
    --blue-300: #7dacc4;
    --blue-400: #6d98ba;
    --blue-500: #5a87aa;
    --blue-600: #4a7599;
    --blue-700: #3a6188;
    --blue-800: #2d4d6b;
    --blue-900: #203a51;

    /* Accent Color */
    --accent: #d81e5b;
    --accent-light: #e84a7a;
    --accent-dark: #b8184d;

    /* Neutrals - Light Mode */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #e5e5e5;
    --shadow: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'DM Serif Display', Georgia, serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    /* Animation */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
body.dark-mode {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-tertiary: #808080;
    --border-color: #2a2a2a;
    --shadow: rgba(0, 0, 0, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ============================================
   Header
   ============================================ */

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
}

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

.menu-btn {
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: 0;
}

.menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-btn:hover span {
    background-color: var(--blue-600);
}

.theme-toggle {
    width: 64px;
    height: 32px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    padding: 4px;
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--blue-400);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: var(--transition);
}

.sun-icon {
    left: 6px;
    color: var(--blue-600);
    opacity: 1;
}

.moon-icon {
    right: 6px;
    color: var(--text-tertiary);
    opacity: 0;
}

body.dark-mode .sun-icon {
    opacity: 0;
}

body.dark-mode .moon-icon {
    opacity: 1;
    color: var(--blue-400);
}

/* ============================================
   Main Content
   ============================================ */

.main {
    padding: var(--space-xl) 0 var(--space-2xl) 0;
}

.section-title {
    margin-bottom: var(--space-lg);
    padding-top: var(--space-lg);
}

.section-title:first-child {
    padding-top: 0;
}

.section-title h2 {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    box-shadow: 0 2px 8px var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow);
}

.card-intro {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

/* ============================================
   Profile Card
   ============================================ */

.profile-card {
    animation: fadeInUp 0.6s ease-out;
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.profile-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin-bottom: var(--space-xs);
}

.profile-name {
    font-family: var(--font-sans);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.profile-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.btn-learn-more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 14px 28px;
    background-color: var(--accent);
    color: white;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.btn-learn-more:hover {
    background-color: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(216, 30, 91, 0.3);
}

.btn-learn-more svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   Links Card
   ============================================ */

.links-card {
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

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

.card-icon {
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
}

.card-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-tertiary);
}

.social-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.social-link {
    width: 100%;
    aspect-ratio: 1;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-primary);
}

.social-link svg {
    width: 28px;
    height: 28px;
}

.social-link:hover {
    background-color: var(--blue-50);
    border-color: var(--blue-400);
    transform: translateY(-4px);
    box-shadow: 0 8px 16px var(--shadow);
}

body.dark-mode .social-link:hover {
    background-color: var(--blue-900);
}

/* ============================================
   Skills Section
   ============================================ */

.skills-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.skill-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.skill-item:hover {
    background-color: var(--blue-50);
    transform: translateX(4px);
}

body.dark-mode .skill-item:hover {
    background-color: var(--blue-900);
}

.skill-icon-wrapper {
    width: 48px;
    height: 48px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.skill-icon {
    width: 24px;
    height: 24px;
    color: var(--blue-600);
}

.skill-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.skill-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Skill Categories */
.skills-card .skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.skill-category {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skill-category-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--blue-600);
    margin-bottom: var(--space-xs);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--border-color);
}

body.dark-mode .skill-category-title {
    color: var(--blue-400);
}

.skill-category .skill-item {
    padding: var(--space-sm);
    margin: 0;
}

.skill-category .skill-icon-wrapper {
    width: 40px;
    height: 40px;
}

.skill-category .skill-icon {
    width: 20px;
    height: 20px;
}

/* Tech Tags */
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
}

.tech-tag {
    display: inline-block;
    padding: 6px 14px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tech-tag:hover {
    background-color: var(--blue-50);
    border-color: var(--blue-400);
    color: var(--blue-700);
}

body.dark-mode .tech-tag:hover {
    background-color: var(--blue-900);
    color: var(--blue-300);
}

/* ============================================
   Hobby Section
   ============================================ */

.hobby-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.hobby-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.hobby-item:hover {
    background-color: var(--blue-50);
    transform: translateY(-2px);
}

body.dark-mode .hobby-item:hover {
    background-color: var(--blue-900);
}

.hobby-item--featured {
    grid-column: span 1;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--blue-50) 100%);
    border: 1px solid var(--border-color);
}

body.dark-mode .hobby-item--featured {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--blue-900) 100%);
}

.hobby-item--featured:hover {
    border-color: var(--blue-400);
}

.hobby-icon-wrapper {
    width: 48px;
    height: 48px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.hobby-icon {
    width: 26px;
    height: 26px;
    color: var(--accent);
}

.hobby-content {
    flex: 1;
    min-width: 0;
}

.hobby-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.hobby-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.hobby-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: var(--space-xs);
}

.hobby-tag {
    display: inline-block;
    padding: 3px 10px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-tertiary);
    border: 1px solid var(--border-color);
}

/* ============================================
   Contact Section
   ============================================ */

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-tertiary);
}

.contact-value {
    font-size: 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: var(--space-xl) 0;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stagger animations for cards */
.card:nth-child(3) {
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.card:nth-child(5) {
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.card:nth-child(7) {
    animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .profile-header {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
    }

    .profile-name {
        font-size: 1.5rem;
    }

    .social-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .skills-card .skills-grid {
        grid-template-columns: 1fr;
    }

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

    .hobby-item--featured {
        grid-column: span 1;
    }

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

@media (max-width: 480px) {
    .section-title h2 {
        font-size: 1.25rem;
    }
    
    .card {
        padding: var(--space-md);
    }
    
    .btn-learn-more {
        width: 100%;
        justify-content: center;
    }
}