/* =============================================
   SANDRA KIMIRING PORTFOLIO - STYLES
   Version 1.0
   ============================================= */

/* =============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================= */
:root {
    /* Colors - Light Mode */
    --color-primary: #FF4DA6;
    --color-primary-light: #FF7AC4;
    --color-primary-dark: #E6358F;
    --color-primary-subtle: rgba(255, 77, 166, 0.1);
    
    --color-bg: #FAFAFA;
    --color-bg-alt: #F0F0F2;
    --color-bg-card: #FFFFFF;
    --color-bg-elevated: #FFFFFF;
    
    --color-text: #1C1C1E;
    --color-text-secondary: #636366;
    --color-text-muted: #8E8E93;
    
    --color-border: #E5E5EA;
    --color-border-light: #F2F2F7;
    
    /* Status Colors */
    --color-deployed: #34C759;
    --color-complete: #007AFF;
    --color-learning: #FF9500;
    --color-exploration: #AF52DE;
    
    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Playfair Display', Georgia, 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-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.1;
    --line-height-snug: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --nav-height: 72px;
    
    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* =============================================
   DARK MODE
   ============================================= */
[data-theme="dark"] {
    --color-bg: #0D0D0D;
    --color-bg-alt: #1C1C1E;
    --color-bg-card: #1C1C1E;
    --color-bg-elevated: #2C2C2E;
    
    --color-text: #FAFAFA;
    --color-text-secondary: #A1A1A6;
    --color-text-muted: #636366;
    
    --color-border: #3A3A3C;
    --color-border-light: #2C2C2E;
    
    --color-primary-subtle: rgba(255, 77, 166, 0.15);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

ul, ol {
    list-style: none;
}

/* Selection */
::selection {
    background-color: var(--color-primary);
    color: white;
}

/* =============================================
   LAYOUT
   ============================================= */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

section {
    padding: var(--space-24) 0;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-4);
}

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

/* =============================================
   NAVIGATION
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background-color: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .navbar.scrolled {
    background-color: rgba(13, 13, 13, 0.95);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

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

.nav-menu {
    display: flex;
    gap: var(--space-8);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    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-color: var(--color-primary);
    transition: width var(--transition-base);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
}

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

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

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

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    padding: 4px 0;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: var(--nav-height);
    position: relative;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.hero-content {
    z-index: 1;
}

.hero-greeting {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.hero-name {
    font-size: var(--font-size-6xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-family: var(--font-body);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.hero-title .separator {
    color: var(--color-primary);
    margin: 0 var(--space-2);
}

.hero-intro {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    max-width: 540px;
    margin-bottom: var(--space-8);
}

.hero-ctas {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.hero-secondary-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.link-subtle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.link-dot {
    width: 4px;
    height: 4px;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image-wrapper {
    position: relative;
    z-index: 2;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-bg-card);
    box-shadow: 
        0 0 0 8px var(--color-primary-subtle),
        var(--shadow-xl);
    animation: fadeIn 1s ease-out 0.3s both;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transition: transform var(--transition-slow);
}

.hero-image-wrapper:hover .hero-image {
    transform: scale(1.05);
}

.hero-shape {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--color-primary-subtle) 0%, transparent 70%);
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    animation: morphShape 8s ease-in-out infinite;
}

.hero-accent {
    position: absolute;
    top: 30%;
    right: 20%;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    opacity: 0.15;
    animation: morphShape 10s ease-in-out infinite reverse;
}

@keyframes morphShape {
    0%, 100% {
        border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    }
    50% {
        border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 77, 166, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-bg-alt);
    border-color: var(--color-text-muted);
}

/* =============================================
   ABOUT SECTION
   ============================================= */
.about {
    background-color: var(--color-bg-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-16);
    margin-bottom: var(--space-16);
}

.about-bio {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.bio-text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

.bio-text strong {
    color: var(--color-text);
    font-weight: var(--font-weight-semibold);
}

.about-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.detail-card {
    background-color: var(--color-bg-card);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.detail-title {
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.detail-label {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.detail-value {
    color: var(--color-text-secondary);
}

.interest-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.interest-list li {
    color: var(--color-text-secondary);
    padding-left: var(--space-4);
    position: relative;
}

.interest-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
}

/* Tech Stack */
.tech-stack {
    background-color: var(--color-bg-card);
    padding: var(--space-10);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
}

.tech-title {
    font-family: var(--font-body);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-8);
    text-align: center;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-8);
}

.tech-category h4 {
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tech-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    white-space: nowrap;
    line-height: 1;
}

.tech-tag i {
    font-size: 14px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tech-tag:hover {
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
}

/* Preserve Devicon brand colors - don't override on hover */
.tech-tag i.colored {
    /* Keep original brand colors */
}

.tech-tag:hover i:not(.colored) {
    color: var(--color-primary);
}

/* =============================================
   PROJECTS SECTION
   ============================================= */
.project-filters {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-12);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-2) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

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

/* Project Categories */
.project-category {
    margin-bottom: var(--space-16);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-6);
}

.category-icon {
    font-size: var(--font-size-2xl);
}

.category-badge {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-1) var(--space-3);
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
    border-radius: var(--radius-full);
}

.category-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: var(--space-6);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-6);
}

/* Project Card */
.project-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    transition: all var(--transition-base);
    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) 0%, var(--color-primary-light) 100%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-subtle);
}

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

.project-exploratory {
    border-style: dashed;
}

.project-header {
    margin-bottom: 0;
}

.project-status {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
}

.status-deployed {
    background-color: rgba(52, 199, 89, 0.1);
    color: var(--color-deployed);
}

.status-complete {
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--color-complete);
}

.status-learning {
    background-color: rgba(255, 149, 0, 0.1);
    color: var(--color-learning);
}

.status-exploration {
    background-color: rgba(175, 82, 222, 0.1);
    color: var(--color-exploration);
}

.project-title {
    font-family: var(--font-body);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-snug);
}

.project-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.tag {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);
    padding: var(--space-1) var(--space-2);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-sm);
}

.project-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
}

.highlight {
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

/* Project Links */
.project-links {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
}

.project-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.project-link:hover {
    color: var(--color-primary-dark);
}

/* Dark mode adjustments for buttons */
[data-theme="dark"] .btn-code:hover {
    background-color: var(--color-bg-elevated);
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

/* =============================================
   WRITING & COMMUNITY SECTION
   ============================================= */
.writing {
    background-color: var(--color-bg-alt);
}

.writing-subsection {
    margin-bottom: var(--space-16);
}

.writing-subsection:last-child {
    margin-bottom: 0;
}

.subsection-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-4);
}

.subsection-icon {
    font-size: var(--font-size-2xl);
}

.subsection-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: var(--space-6);
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

.article-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
}

.article-card:hover {
    border-color: var(--color-primary-subtle);
    box-shadow: var(--shadow-md);
}

.article-tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    background-color: var(--color-primary-subtle);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-3);
}

.article-title {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    line-height: var(--line-height-snug);
}

.article-excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-3);
}

.article-status {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-style: italic;
}

/* Research Card */
.research-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    border-left: 3px solid var(--color-primary);
}

.research-text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.research-text strong {
    color: var(--color-text);
}

.research-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
}

/* Community Grid */
.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.community-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
}

.community-card:hover {
    border-color: var(--color-primary-subtle);
}

.community-highlight {
    border-color: var(--color-primary);
    position: relative;
}

.community-badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: white;
    background-color: var(--color-primary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-3);
}

.community-card h4 {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
}

.community-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.community-link {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.community-link:hover {
    color: var(--color-primary-dark);
}

/* =============================================
   CONTACT SECTION
   ============================================= */
.contact {
    background-color: var(--color-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    max-width: var(--max-width-narrow);
    margin: 0 auto var(--space-12);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: var(--color-primary-subtle);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

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

.contact-value {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

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

/* Social Links */
.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--color-primary-subtle);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateX(4px);
}

.social-link svg {
    flex-shrink: 0;
}

/* Future Features */
.future-features {
    text-align: center;
    padding: var(--space-8);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    border: 1px dashed var(--color-border);
    max-width: var(--max-width-narrow);
    margin: 0 auto;
}

.future-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    padding: var(--space-12) 0;
    border-top: 1px solid var(--color-border-light);
    background-color: var(--color-bg);
}

.footer-content {
    text-align: center;
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

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

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Staggered animations */
.hero-greeting { animation-delay: 0.1s; }
.hero-name { animation-delay: 0.2s; }
.hero-title { animation-delay: 0.3s; }
.hero-intro { animation-delay: 0.4s; }
.hero-ctas { animation-delay: 0.5s; }
.hero-secondary-links { animation-delay: 0.6s; }

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-6xl: 3.5rem;
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-intro {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-ctas {
        justify-content: center;
    }
    
    .hero-secondary-links {
        justify-content: center;
    }
    
    .hero-visual {
        display: flex;
        height: auto;
        margin-bottom: var(--space-10);
        order: -1;
    }
    
    .hero-image-wrapper {
        width: 280px;
        height: 280px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --nav-height: 64px;
    }
    
    section {
        padding: var(--space-16) 0;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    /* Mobile Navigation */
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--space-8);
        background-color: var(--color-bg);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        font-size: var(--font-size-xl);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    /* Hero */
    .hero-image-wrapper {
        width: 220px;
        height: 220px;
    }
    
    .hero-ctas {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .hero-ctas .btn {
        width: 100%;
    }
    
    .scroll-indicator {
        display: none;
    }
    
    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-filters {
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: var(--space-2);
        margin-left: calc(var(--space-4) * -1);
        margin-right: calc(var(--space-4) * -1);
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }
    
    .filter-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .project-links {
        flex-wrap: wrap;
    }
    
    /* Tech Stack */
    .tech-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    /* Articles */
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    /* Community */
    .community-grid {
        grid-template-columns: 1fr;
    }
    
    /* Contact */
    .social-links {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .social-link {
        flex: 1;
        min-width: calc(50% - var(--space-2));
        justify-content: center;
    }
    
    .social-link span {
        display: none;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-6xl: 2rem;
    }
    
    .hero-image-wrapper {
        width: 180px;
        height: 180px;
    }
    
    .hero-title {
        font-size: var(--font-size-base);
    }
    
    .hero-title .separator {
        display: none;
    }
    
    .hero-title::before {
        content: '\A';
        white-space: pre;
    }
    
    .section-header {
        margin-bottom: var(--space-10);
    }
    
    .tech-stack {
        padding: var(--space-6);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* High Contrast */
@media (prefers-contrast: high) {
    :root {
        --color-border: #1C1C1E;
        --color-border-light: #636366;
    }
    
    [data-theme="dark"] {
        --color-border: #FAFAFA;
        --color-border-light: #A1A1A6;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .theme-toggle,
    .scroll-indicator,
    .hero-visual {
        display: none !important;
    }
    
    section {
        padding: var(--space-8) 0;
        page-break-inside: avoid;
    }
    
    .hero {
        min-height: auto;
        padding-top: 0;
    }
    
    a {
        text-decoration: underline;
    }
    
    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: var(--font-size-sm);
    }
}