@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: rgba(17, 24, 39, 0.7);
    --bg-glass: rgba(22, 30, 45, 0.65);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --primary: #8b5cf6;       
    --primary-rgb: 139, 92, 246;
    --secondary: #06b6d4;     
    --secondary-rgb: 6, 182, 212;
    --accent: #10b981;        
    
    --card-border: rgba(255, 255, 255, 0.08);
    --card-border-hover: rgba(139, 92, 246, 0.3);
    --shadow-main: rgba(0, 0, 0, 0.4);
    --shadow-glow: rgba(139, 92, 246, 0.15);
    
    --navbar-bg: rgba(11, 15, 25, 0.8);
    --navbar-border: rgba(255, 255, 255, 0.05);

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

body.light-theme {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: rgba(241, 245, 249, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.75);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --primary: #6d28d9;       
    --primary-rgb: 109, 40, 217;
    --secondary: #0891b2;     
    --secondary-rgb: 8, 145, 178;
    --accent: #059669;        
    
    --card-border: rgba(15, 23, 42, 0.08);
    --card-border-hover: rgba(109, 40, 217, 0.25);
    --shadow-main: rgba(15, 23, 42, 0.08);
    --shadow-glow: rgba(109, 40, 217, 0.08);
    
    --navbar-bg: rgba(248, 250, 252, 0.85);
    --navbar-border: rgba(15, 23, 42, 0.05);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

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

button, input, textarea {
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
}

ul {
    list-style: none;
}

::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-primary);
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 8px;
    display: inline-block;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
    padding-bottom: 12px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
}

.glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(120%);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px 0 var(--shadow-main);
    transition: transform var(--transition-normal), border var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-border-hover);
    box-shadow: 0 12px 40px 0 var(--shadow-glow);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-green {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.scroll-progress-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: transparent;
    z-index: 1001;
}

.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    box-shadow: 0 0 8px var(--primary);
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
    transition: width 0.1s ease-out;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--navbar-border);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -1px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 10px var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    transition: width var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.theme-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    transition: background-color var(--transition-normal);
}

.theme-toggle-btn:hover {
    background-color: var(--primary);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
    fill: var(--text-primary);
    transition: transform var(--transition-slow), opacity var(--transition-fast);
}

body.light-theme .theme-toggle-btn:hover svg {
    fill: #ffffff;
}

.sun-icon {
    position: absolute;
    opacity: 0;
    transform: translateY(30px);
}

.moon-icon {
    position: absolute;
    opacity: 1;
    transform: translateY(0);
}

body.light-theme .sun-icon {
    opacity: 1;
    transform: translateY(0);
}

body.light-theme .moon-icon {
    opacity: 0;
    transform: translateY(-30px);
}

.lang-toggle-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 44px;
    padding: 0 16px;
    border-radius: var(--radius-full);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    cursor: pointer;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
}

.lang-toggle-btn:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.25);
}

.lang-toggle-btn svg {
    fill: currentColor;
    transition: transform var(--transition-normal);
}

.lang-toggle-btn:hover svg {
    transform: rotate(20deg);
}

.lang-toggle-btn .lang-text {
    line-height: 1;
}

body.light-theme .lang-toggle-btn:hover {
    color: #ffffff;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: none;
    border: none;
    z-index: 1010;
}

.hamburger span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.hero {
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

#neural-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: auto;
}

.hero-glow-1 {
    position: absolute;
    top: 20%;
    left: 10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: 0;
    filter: blur(40px);
    pointer-events: none;
}

.hero-glow-2 {
    position: absolute;
    bottom: 10%;
    right: 15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: 0;
    filter: blur(50px);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 2;
    pointer-events: none; 
}

.hero-content, .hero-buttons, .hero-socials, .navbar, .glass-card, input, button, textarea, a {
    pointer-events: auto;
}

.hero-content {
    max-width: 700px;
}

.hero-welcome {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.hero-welcome::before {
    content: '';
    width: 30px;
    height: 2px;
    background-color: var(--primary);
    display: inline-block;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 24px;
    height: 42px; 
    display: flex;
    align-items: center;
}

.typed-cursor {
    font-weight: 300;
    color: var(--secondary);
    animation: blink 0.8s infinite;
    margin-left: 4px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

.btn-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    color: var(--text-primary);
}

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

.hero-socials {
    display: flex;
    gap: 20px;
    margin-top: 50px;
}

.social-icon-btn {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background-color: var(--bg-glass);
    border: 1px solid var(--card-border);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-normal);
}

.social-icon-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-secondary);
    transition: fill var(--transition-fast), transform var(--transition-fast);
}

.social-icon-btn.github:hover {
    border-color: #f0f6fc;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}
.social-icon-btn.github:hover svg {
    fill: var(--text-primary);
    transform: scale(1.1);
}

.social-icon-btn.linkedin:hover {
    border-color: #0077b5;
    box-shadow: 0 0 15px rgba(0, 119, 181, 0.2);
}
.social-icon-btn.linkedin:hover svg {
    fill: #0a66c2;
    transform: scale(1.1);
}

.social-icon-btn.kaggle:hover {
    border-color: #20beff;
    box-shadow: 0 0 15px rgba(32, 190, 255, 0.2);
}
.social-icon-btn.kaggle:hover svg {
    fill: #20beff;
    transform: scale(1.1);
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: minmax(140px, auto);
    gap: 24px;
    margin-top: 40px;
}

.bento-card {
    position: relative;
    overflow: hidden;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 16px;
    border-radius: var(--radius-lg);
    background: var(--bg-glass);
    border: 1px solid var(--card-border);
    box-shadow: 0 8px 32px 0 var(--shadow-main);
    transition: transform var(--transition-normal), 
                border-color var(--transition-normal), 
                box-shadow var(--transition-normal);
    cursor: pointer;
    z-index: 1;
}

.bento-card:hover {
    transform: translateY(-6px);
    border-color: var(--card-border-hover);
    box-shadow: 0 16px 40px var(--shadow-glow), 0 0 0 1px var(--card-border-hover);
}

.bento-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        400px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(var(--primary-rgb), 0.08),
        transparent 50%
    );
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.bento-card:hover .bento-glow {
    opacity: 1;
}

.bento-header {
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 2;
    position: relative;
}

.bento-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: rgba(var(--primary-rgb), 0.08);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background var(--transition-normal), transform var(--transition-normal), border-color var(--transition-normal);
}

.bento-card:hover .bento-icon {
    transform: scale(1.05) rotate(3deg);
    border-color: rgba(var(--primary-rgb), 0.3);
    background: rgba(var(--primary-rgb), 0.15);
}

.bento-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--primary);
    transition: fill var(--transition-normal);
}

.bento-card:hover .bento-icon svg {
    fill: var(--secondary);
}

.bento-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.3px;
    transition: color var(--transition-fast);
}

.bento-card:hover .bento-header h3 {
    color: var(--primary);
}

.bento-body {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    z-index: 2;
    position: relative;
}

.bento-body p {
    margin: 0;
}

.bento-card-main {
    grid-column: span 2;
    grid-row: span 2;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.06) 0%, rgba(var(--secondary-rgb), 0.03) 100%), var(--bg-glass);
    justify-content: space-between;
}

.bento-card-main .bio-lead {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.bento-card-main strong {
    color: var(--primary);
    font-weight: 600;
}

.bento-card-tools {
    grid-column: span 1;
    grid-row: span 2;
    background: linear-gradient(135deg, rgba(var(--secondary-rgb), 0.04) 0%, rgba(var(--primary-rgb), 0.02) 100%), var(--bg-glass);
}

.tools-desc {
    font-size: 0.88rem;
    margin-bottom: 20px !important;
}

.bento-tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 10px;
}

.tool-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
}

.tool-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--text-muted);
    transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.tool-badge.rstudio:hover {
    color: #214a7f;
    border-color: rgba(33, 74, 127, 0.4);
    background-color: rgba(33, 74, 127, 0.08);
    box-shadow: 0 0 12px rgba(33, 74, 127, 0.2);
    transform: translateY(-2px);
}
.tool-badge.rstudio:hover .tool-dot {
    background-color: #214a7f;
    transform: scale(1.3);
}

.tool-badge.python:hover {
    color: #ffd43b;
    border-color: rgba(55, 118, 171, 0.4);
    background-color: rgba(55, 118, 171, 0.08);
    box-shadow: 0 0 12px rgba(255, 212, 59, 0.15);
    transform: translateY(-2px);
}
.tool-badge.python:hover .tool-dot {
    background-color: #ffd43b;
    transform: scale(1.3);
}

.tool-badge.sql:hover {
    color: #00a2ed;
    border-color: rgba(0, 162, 237, 0.4);
    background-color: rgba(0, 162, 237, 0.08);
    box-shadow: 0 0 12px rgba(0, 162, 237, 0.2);
    transform: translateY(-2px);
}
.tool-badge.sql:hover .tool-dot {
    background-color: #00a2ed;
    transform: scale(1.3);
}

.tool-badge.matlab:hover {
    color: #d12c00;
    border-color: rgba(209, 44, 0, 0.4);
    background-color: rgba(209, 44, 0, 0.08);
    box-shadow: 0 0 12px rgba(209, 44, 0, 0.2);
    transform: translateY(-2px);
}
.tool-badge.matlab:hover .tool-dot {
    background-color: #d12c00;
    transform: scale(1.3);
}

.bento-card-hobby {
    grid-column: span 1;
    min-height: 200px;
    background: var(--bg-glass);
}

.bento-card-hobby:hover {
    border-color: var(--card-border-hover);
}

.bento-card-collab {
    grid-column: span 3;
    background: linear-gradient(90deg, rgba(var(--primary-rgb), 0.04) 0%, rgba(var(--secondary-rgb), 0.04) 100%), var(--bg-glass);
    border: 1px solid rgba(var(--primary-rgb), 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 40px;
    min-height: 100px;
}

.bento-collab-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 30px;
    z-index: 2;
}

.collab-pulse-box {
    position: relative;
    width: 24px;
    height: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.pulse-ring {
    position: absolute;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    background-color: transparent;
    animation: beacon-pulse 2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
    opacity: 0;
}

.pulse-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent);
    box-shadow: 0 0 12px var(--accent);
    z-index: 1;
}

@keyframes beacon-pulse {
    0% {
        transform: scale(0.6);
        opacity: 0.8;
    }
    50% {
        opacity: 0.4;
    }
    100% {
        transform: scale(1.6);
        opacity: 0;
    }
}

.collab-text {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.5;
    flex-grow: 1;
    margin: 0;
}

.bento-collab-btn {
    flex-shrink: 0;
    padding: 12px 24px !important;
    font-size: 0.95rem !important;
    white-space: nowrap;
}

.bento-collab-btn svg {
    transition: transform var(--transition-fast);
}

.bento-collab-btn:hover svg {
    transform: translateX(4px);
}

@media (max-width: 992px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: auto;
        gap: 20px;
    }

    .bento-card-main {
        grid-column: span 2;
    }

    .bento-card-tools {
        grid-column: span 2;
    }

    .bento-card-hobby {
        grid-column: span 1;
        min-height: 180px;
    }

    .bento-card-collab {
        grid-column: span 2;
        padding: 30px;
    }
}

@media (max-width: 768px) {
    .bento-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .bento-card {
        padding: 24px;
    }

    .bento-card-main,
    .bento-card-tools,
    .bento-card-hobby,
    .bento-card-collab {
        grid-column: span 1;
        grid-row: span 1;
    }

    .bento-collab-wrapper {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .bento-collab-btn {
        width: 100%;
        justify-content: center;
    }
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.skills-category {
    padding: 32px;
}

.skills-category-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.skills-category-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    cursor: default;
}

.skill-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    display: inline-block;
    transition: all var(--transition-normal);
}

.dot-stat {
    background-color: var(--primary);
    box-shadow: 0 0 8px var(--primary);
}

.dot-prog {
    background-color: var(--secondary);
    box-shadow: 0 0 8px var(--secondary);
}

.dot-soft {
    background-color: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

.skill-tag:hover {
    transform: translateY(-2px);
    border-color: var(--card-border-hover);
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.08);
}

.skill-tag:hover .skill-dot {
    transform: scale(1.3);
}

body.light-theme .skill-tag {
    background-color: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.06);
    color: var(--text-secondary);
}

body.light-theme .skill-tag:hover {
    background-color: rgba(0, 0, 0, 0.04);
    border-color: var(--card-border-hover);
    color: var(--text-primary);
}

.project-filter-group {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--card-border);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-btn:hover, .filter-btn.active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: transparent;
    box-shadow: 0 4px 12px var(--shadow-glow);
}

body.light-theme .filter-btn:hover, body.light-theme .filter-btn.active {
    color: #ffffff;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.project-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15) 0%, rgba(var(--secondary-rgb), 0.15) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 1px solid var(--card-border);
    overflow: hidden;
}

.project-image svg {
    width: 60px;
    height: 60px;
    fill: var(--primary);
    opacity: 0.8;
    transition: transform var(--transition-normal);
}

.project-card:hover .project-image svg {
    transform: scale(1.1) rotate(5deg);
}

.project-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.project-description {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
    line-height: 1.5;
}

.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.project-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    background-color: var(--bg-primary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
}

.project-links {
    display: flex;
    gap: 16px;
    border-top: 1px solid var(--card-border);
    padding-top: 16px;
}

.project-link {
    font-size: 0.88rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
}

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

.project-link svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.project-card.hide {
    display: none;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 3px solid var(--primary);
    border-radius: 50%;
    position: absolute;
    top: 25px;
    z-index: 10;
    box-shadow: 0 0 10px var(--primary);
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}

.timeline-content {
    padding: 24px;
    position: relative;
}

.timeline-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    display: inline-block;
}

.timeline-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 12px;
}

.timeline-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.timeline-bullets {
    list-style: none;
    padding-left: 0;
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    text-align: left;
}

.timeline-bullets li {
    position: relative;
    padding-left: 18px;
    line-height: 1.5;
}

.timeline-bullets li::before {
    content: '•';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-size: 1.2rem;
    line-height: 1;
}

.timeline-item:nth-child(odd) .timeline-bullets {
    text-align: right;
}

.timeline-item:nth-child(odd) .timeline-bullets li {
    padding-left: 0;
    padding-right: 18px;
}

.timeline-item:nth-child(odd) .timeline-bullets li::before {
    left: auto;
    right: 0;
}

.certificates-grid {
    display: grid;
    gap: 24px;
    margin-top: 40px;
}

@media (min-width: 1025px) {
    .certificates-grid {
        grid-template-columns: repeat(6, 1fr);
    }
    .certificate-card:nth-child(1),
    .certificate-card:nth-child(2),
    .certificate-card:nth-child(3) {
        grid-column: span 2;
    }
    .certificate-card:nth-child(4) {
        grid-column: 2 / span 2;
    }
    .certificate-card:nth-child(5) {
        grid-column: 4 / span 2;
    }
}

.certificate-card {
    position: relative;
    overflow: hidden;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    height: 100%;
}

.certificate-card:hover .bento-glow {
    opacity: 1;
}

.certificate-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 2;
}

.certificate-badge {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-sm);
    background: rgba(var(--primary-rgb), 0.08);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all var(--transition-normal);
}

.certificate-card:hover .certificate-badge {
    transform: scale(1.05) rotate(3deg);
    border-color: rgba(var(--primary-rgb), 0.3);
    background: rgba(var(--primary-rgb), 0.15);
}

.certificate-badge svg {
    width: 22px;
    height: 22px;
    fill: var(--primary);
    transition: fill var(--transition-normal);
}

.certificate-card:hover .certificate-badge svg {
    fill: var(--secondary);
}

.certificate-issuer {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--secondary);
}

.certificate-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    z-index: 2;
}

.certificate-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.55;
    z-index: 2;
}

.certificate-verify {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--card-border);
    z-index: 2;
}

.certificate-verify svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

.contact-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-method-card {
    padding: 24px;
    display: flex;
    gap: 20px;
    align-items: center;
}

.contact-method-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-method-icon svg {
    width: 22px;
    height: 22px;
    fill: var(--primary);
}

.contact-method-details h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-method-details p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-form {
    padding: 40px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 14px 20px;
    background-color: var(--bg-primary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all var(--transition-normal);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.15);
}

textarea.form-control {
    resize: none;
    min-height: 150px;
}

.form-feedback {
    display: none;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.form-feedback.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--accent);
    color: var(--accent);
}

.form-feedback.error {
    display: block;
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid #ef4444;
    color: #ef4444;
}

.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--card-border);
    padding: 40px 0;
    text-align: center;
    position: relative;
}

.footer-logo {
    margin-bottom: 16px;
}

.footer-socials {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.footer-socials .social-icon-btn {
    width: 44px;
    height: 44px;
}

.footer-text {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.3);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
}

.scroll-top-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.5);
    background-color: var(--secondary);
}

.scroll-top-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 3.2rem;
    }

    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .certificate-card:nth-child(5) {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 70px 0;
    }

    .navbar-container {
        height: 70px;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-primary);
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 32px;
        z-index: 999;
        transition: left var(--transition-normal);
        border-top: 1px solid var(--navbar-border);
    }

    .nav-links.active {
        left: 0;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    .hero {
        text-align: center;
        justify-content: center;
    }

    .hero-welcome {
        justify-content: center;
    }

    .hero-welcome::before {
        display: none;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .hero-subtitle {
        justify-content: center;
    }

    .hero-description {
        margin: 0 auto 40px auto;
    }

    .btn-group {
        justify-content: center;
    }

    .hero-socials {
        justify-content: center;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        flex-direction: row;
        justify-content: space-between;
    }

    .stat-box {
        flex: 1;
    }

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

    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }

    .timeline-item:nth-child(odd) {
        text-align: left;
        left: 0;
    }

    .timeline-item:nth-child(odd) .timeline-bullets {
        text-align: left;
    }

    .timeline-item:nth-child(odd) .timeline-bullets li {
        padding-left: 18px;
        padding-right: 0;
    }

    .timeline-item:nth-child(odd) .timeline-bullets li::before {
        left: 0;
        right: auto;
    }

    .timeline-item:nth-child(even) {
        left: 0;
    }

    .timeline-item:nth-child(odd) .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 22px;
        right: auto;
    }

    .certificates-grid {
        grid-template-columns: 1fr;
    }
    .certificate-card:nth-child(5) {
        grid-column: span 1;
    }

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

    .contact-form {
        padding: 24px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .about-stats {
        flex-direction: column;
    }

    .timeline-item {
        padding-left: 55px;
        padding-right: 15px;
    }

    .timeline-dot {
        left: 17px;
    }
}

/* --- Regresyon Oyun Alani (Playground) --- */
.playground-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 32px;
    margin-top: 40px;
    align-items: stretch;
}

.playground-canvas-wrapper {
    display: flex;
    flex-direction: column;
    padding: 24px;
    border-radius: var(--radius-lg);
    background: var(--bg-glass);
}

.canvas-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--card-border);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
}

#regression-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

.canvas-warning-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(11, 15, 25, 0.75);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
    z-index: 5;
    backdrop-filter: blur(4px);
}

.canvas-warning-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.canvas-warning-overlay span {
    background: var(--bg-glass);
    border: 1px solid var(--card-border);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    max-width: 85%;
}

.playground-controls {
    display: flex;
    gap: 16px;
    margin-top: 20px;
    justify-content: space-between;
    align-items: center;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    transition: var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider::before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: var(--transition-fast);
}

input:checked + .slider {
    background-color: rgba(var(--primary-rgb), 0.2);
    border-color: var(--primary);
    box-shadow: 0 0 8px rgba(var(--primary-rgb), 0.3), inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

input:checked + .slider::before {
    background-color: var(--primary);
    transform: translateX(22px);
    box-shadow: 0 0 8px rgba(var(--primary-rgb), 0.5);
}

/* Light Theme overrides for Toggle Switch */
body.light-theme .slider {
    background-color: #e2e8f0;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

body.light-theme .slider::before {
    background-color: #94a3b8;
}

body.light-theme input:checked + .slider {
    background-color: rgba(var(--primary-rgb), 0.1);
}

body.light-theme input:checked + .slider::before {
    background-color: var(--primary);
}

.slider.round {
    border-radius: var(--radius-full);
}

.slider.round::before {
    border-radius: 50%;
}

.toggle-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.playground-buttons {
    display: flex;
    gap: 12px;
}

.playground-controls .btn {
    padding: 12px 20px;
    font-size: 0.9rem;
}

.playground-stats-wrapper {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Stats Cards */
.stat-card {
    display: flex;
    padding: 24px;
    border-radius: var(--radius-md);
    align-items: center;
    gap: 20px;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.formula-card {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.08) 0%, rgba(var(--secondary-rgb), 0.04) 100%), var(--bg-glass);
    border: 1px solid rgba(var(--primary-rgb), 0.15);
}

.formula-card:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-label {
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.stat-value {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text-primary);
}

.formula-value {
    font-size: 1.8rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    word-break: break-all;
}

.stats-mini-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.mini-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    gap: 10px;
}

.mini-card .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
}

/* Light Theme overrides for canvas warning overlay */
body.light-theme .canvas-warning-overlay {
    background-color: rgba(241, 245, 249, 0.75);
}

/* Responsive Styles for Playground */
@media (max-width: 992px) {
    .playground-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .playground-controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .playground-buttons {
        width: 100%;
        justify-content: flex-end;
    }
}

@media (max-width: 576px) {
    .playground-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }
    
    .playground-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .playground-controls .btn {
        justify-content: center;
    }
    
    .stats-mini-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-mini-grid .stat-card {
        grid-column: span 1 !important;
    }
    
    .formula-value {
        font-size: 1.4rem;
    }
}