/* ==========================================================================
   PORTFOLIO DESIGN SYSTEM & STYLESHEET - VIAN FERDIAN
   ========================================================================== */

/* --- COLOR THEME VARIABLES --- */
:root {
    /* Fonts */
    --font-primary: 'Plus Jakarta Sans', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* Gradients */
    --grad-primary: linear-gradient(135deg, #3B82F6 0%, #6366F1 100%);
    --grad-accent: linear-gradient(135deg, #10B981 0%, #059669 100%);
}

/* --- DARK THEME (DEFAULT) --- */
[data-theme="dark"] {
    --bg-primary: #070D19;
    --bg-secondary: #0E1626;
    --bg-tertiary: #162035;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent-color: #3B82F6;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --accent-hover: #60A5FA;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --glass-bg: rgba(14, 22, 38, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --shadow-main: 0 20px 40px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
    
    --card-code-bg: #0B0F19;
    
    /* Project Gradient Overlays */
    --bg-grad-web: linear-gradient(135deg, #1E1B4B 0%, #0F172A 100%);
    --bg-grad-mobile: linear-gradient(135deg, #172554 0%, #0F172A 100%);
    --bg-grad-gateway: linear-gradient(135deg, #022C22 0%, #0F172A 100%);
    
    --theme-toggle-shadow: 0 0 15px rgba(241, 245, 249, 0.15);
}

/* --- LIGHT THEME --- */
[data-theme="light"] {
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #EEF2F6;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    
    --accent-color: #00236F;
    --accent-glow: rgba(0, 35, 111, 0.08);
    --accent-hover: #0051D5;
    
    --border-color: rgba(15, 23, 42, 0.08);
    --border-hover: rgba(15, 23, 42, 0.15);
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(15, 23, 42, 0.05);
    --shadow-main: 0 20px 40px rgba(15, 23, 42, 0.06);
    --shadow-glow: 0 0 20px rgba(0, 81, 213, 0.15);
    
    --card-code-bg: #1E293B;
    
    /* Project Gradient Overlays */
    --bg-grad-web: linear-gradient(135deg, #E0E7FF 0%, #EEF2F6 100%);
    --bg-grad-mobile: linear-gradient(135deg, #DBEAFE 0%, #EEF2F6 100%);
    --bg-grad-gateway: linear-gradient(135deg, #D1FAE5 0%, #EEF2F6 100%);
    
    --theme-toggle-shadow: 0 0 15px rgba(15, 23, 42, 0.1);
}

/* --- RESET & BASE STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    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);
}

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

button, input, textarea {
    font-family: inherit;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
    border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --- LAYOUT UTILITIES --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-padding {
    padding: 7rem 0 5rem 0;
}

/* Glowing background orbs */
.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.4;
    pointer-events: none;
    transition: all var(--transition-slow);
}
[data-theme="light"] .glow-orb {
    opacity: 0.15;
    filter: blur(120px);
}
.orb-1 {
    width: 400px;
    height: 400px;
    background: #3B82F6;
    top: 5%;
    right: 10%;
    animation: floatOrb1 20s infinite alternate ease-in-out;
}
.orb-2 {
    width: 350px;
    height: 350px;
    background: #6366F1;
    top: 40%;
    left: 5%;
    animation: floatOrb2 25s infinite alternate ease-in-out;
}
.orb-3 {
    width: 300px;
    height: 300px;
    background: #10B981;
    bottom: 10%;
    right: 15%;
    animation: floatOrb1 18s infinite alternate-reverse ease-in-out;
}

@keyframes floatOrb1 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 30px) scale(1.1); }
}
@keyframes floatOrb2 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-40px, 60px) scale(0.9); }
}

/* Text Gradient Effect */
.text-gradient {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 1.8rem;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.btn-primary {
    background: var(--accent-color);
    color: #FFFFFF !important;
    border: 1px solid var(--accent-color);
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--accent-glow);
}
[data-theme="light"] .btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 10px 20px rgba(0, 35, 111, 0.2);
}
.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
}
.btn-block {
    display: flex;
    width: 100%;
}

/* --- NAVBAR --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}
.navbar.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-main);
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: padding var(--transition-normal);
}
.navbar.scrolled .nav-container {
    padding: 0.8rem 1.5rem;
}
.logo {
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}
.logo-accent {
    color: var(--accent-color);
    transition: color var(--transition-normal);
}
[data-theme="light"] .logo-accent {
    color: var(--accent-hover);
}
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}
.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 0.2rem 0;
}
.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width var(--transition-fast);
}
.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}
.nav-actions {
    display: flex;
    align-items: center;
}
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    box-shadow: var(--theme-toggle-shadow);
    transition: all var(--transition-normal);
}
.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: rotate(15deg);
    border-color: var(--text-secondary);
}
.theme-toggle .icon-light { display: none; }
.theme-toggle .icon-dark { display: block; }
[data-theme="light"] .theme-toggle .icon-light { display: block; }
[data-theme="light"] .theme-toggle .icon-dark { display: none; }

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* --- HERO SECTION --- */
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
    min-height: calc(100vh - 120px);
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--accent-glow);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}
[data-theme="light"] .hero-badge {
    color: var(--accent-hover);
    background: rgba(0, 81, 213, 0.05);
    border-color: rgba(0, 81, 213, 0.15);
}
.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
}
.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    min-height: 2.7rem;
}
.cursor {
    animation: blink 0.8s infinite;
    color: var(--accent-color);
    font-weight: 400;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}
.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-w: 600px;
}
.hero-ctas {
    display: flex;
    gap: 1rem;
}

/* Hero Visual & Mock Terminal */
.hero-visual {
    position: relative;
    width: 100%;
}
.visual-card-wrapper {
    position: relative;
    padding: 2rem 0;
}
.visual-card {
    background: var(--card-code-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-main);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform var(--transition-slow);
    width: 100%;
    max-width: 100%;
}
.visual-card-wrapper:hover .visual-card {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}
.card-header-bar {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.8rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}
.card-header-bar .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}
.card-header-bar .red { background: #FF5F56; }
.card-header-bar .yellow { background: #FFBD2E; }
.card-header-bar .green { background: #27C93F; }
.card-tab-title {
    margin-left: 0.5rem;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}
.card-code-body {
    padding: 1.5rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    overflow-x: auto;
}
.card-code-body pre {
    color: #E2E8F0;
    margin: 0;
}
.code-keyword { color: #F472B6; }
.code-string { color: #34D399; }
.code-class { color: #60A5FA; }

/* Floating Badges */
.floating-badge {
    position: absolute;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    padding: 0.8rem 1.2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-main);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: transform var(--transition-normal);
}
.floating-badge h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
}
.floating-badge p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.floating-badge i {
    font-size: 1.4rem;
}
.badge-1 {
    top: -5px;
    left: -30px;
    animation: floatAnimation 4s infinite alternate ease-in-out;
}
.badge-2 {
    bottom: 40px;
    right: -20px;
    animation: floatAnimation 4.5s infinite alternate-reverse ease-in-out;
}
.badge-3 {
    bottom: -15px;
    left: 20px;
    animation: floatAnimation 3.8s infinite alternate ease-in-out 0.5s;
}

.text-red { color: #EF4444; }
.text-blue { color: #3B82F6; }
.text-green { color: #22C55E; }

@keyframes floatAnimation {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-10px); }
}

/* --- STATS SECTION --- */
.stats-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 3rem 0;
    position: relative;
    z-index: 10;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}
.stat-card {
    text-align: center;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-icon-wrapper {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-bottom: 0.8rem;
    background: var(--accent-glow);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
[data-theme="light"] .stat-icon-wrapper {
    color: var(--accent-hover);
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.3rem;
}
.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* --- COMMON SECTION HEADER --- */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.section-subtitle {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-color);
    display: block;
    margin-bottom: 0.5rem;
}
[data-theme="light"] .section-subtitle {
    color: var(--accent-hover);
}
.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}
.header-line {
    width: 50px;
    height: 4px;
    background: var(--accent-color);
    margin: 1rem auto 0 auto;
    border-radius: 2px;
}

/* --- ABOUT ME SECTION --- */
.about-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

/* Graphic instead of Image */
.dev-avatar-graphic {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-main);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.avatar-glow {
    position: absolute;
    width: 80%;
    height: 80%;
    border-radius: 50%;
    background: var(--grad-primary);
    filter: blur(50px);
    opacity: 0.15;
}
.avatar-terminal {
    width: 90%;
    height: 80%;
    background: var(--card-code-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.terminal-header {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.6rem 0.8rem;
    display: flex;
    gap: 0.4rem;
    border-bottom: 1px solid var(--border-color);
}
.terminal-header span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}
.terminal-header .btn-close { background: #FF5F56; }
.terminal-header .btn-min { background: #FFBD2E; }
.terminal-header .btn-max { background: #27C93F; }
.terminal-body {
    padding: 1.2rem;
    font-family: monospace;
    font-size: 0.8rem;
    color: #F1F5F9;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.t-line { color: var(--accent-color); margin-bottom: 0.5rem; }
[data-theme="light"] .t-line { color: var(--accent-hover); }
.t-prompt { color: #10B981; }
.t-result { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.4; }
.blink { animation: blink 0.8s infinite; }

.about-info h3 {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1.5rem;
}
.about-info p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}
.about-key-points {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem 2rem;
    margin-top: 2rem;
}
.point-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.95rem;
    font-weight: 600;
}
.point-item i {
    font-size: 1.1rem;
    color: var(--accent-color);
    flex-shrink: 0;
}
[data-theme="light"] .point-item i {
    color: var(--accent-hover);
}

/* --- PROJECTS SECTION --- */
.project-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
}
.filter-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 1.4rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.filter-btn:hover, .filter-btn.active {
    background: var(--accent-color);
    color: #FFFFFF;
    border-color: var(--accent-color);
}
[data-theme="light"] .filter-btn:hover, [data-theme="light"] .filter-btn.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.2rem;
}

/* Project Card */
.project-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-main);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}
.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-hover);
}
.project-visual {
    height: 180px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}
.bg-gradient-web { background: var(--bg-grad-web); }
.bg-gradient-mobile { background: var(--bg-grad-mobile); }
.bg-gradient-gateway { background: var(--bg-grad-gateway); }

.project-main-icon {
    font-size: 4rem;
    opacity: 0.85;
    transition: transform var(--transition-normal);
}
.bg-gradient-web .project-main-icon { color: #EF4444; }
.bg-gradient-mobile .project-main-icon { color: #3B82F6; }
.bg-gradient-gateway .project-main-icon { color: #10B981; }

.project-card:hover .project-main-icon {
    transform: scale(1.1);
}
.project-tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.3rem 0.8rem;
    border-radius: 30px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
}
.project-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}
.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    line-height: 1.3;
}
.project-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}
.project-features {
    list-style: none;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
}
.project-features li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}
.project-features li i {
    font-size: 0.75rem;
    margin-top: 0.25rem;
    color: var(--accent-color);
    flex-shrink: 0;
}
[data-theme="light"] .project-features li i {
    color: var(--accent-hover);
}
.project-tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
    margin-bottom: 1.5rem;
}
.project-tech-badges .badge {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}
.project-links {
    display: flex;
    gap: 1rem;
}
.project-link-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.primary-link {
    background: var(--accent-color);
    color: #FFFFFF;
}
.primary-link:hover {
    background: var(--accent-hover);
    box-shadow: 0 5px 15px var(--accent-glow);
}
.project-link-disabled {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* --- SKILLS SECTION --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.2rem;
}
.skill-category-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 2rem;
    box-shadow: var(--shadow-main);
}
.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}
.category-icon {
    font-size: 1.8rem;
}
.category-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}
.skill-items {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}
.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.skill-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}
.skill-bar-wrapper {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
}
.skill-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 10px;
    transition: width 1s ease-in-out;
}
[data-theme="light"] .skill-bar {
    background: var(--accent-hover);
}

/* --- TIMELINE SECTION --- */
.timeline-wrapper {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}
.timeline-wrapper::after {
    content: '';
    position: absolute;
    width: 2px;
    background: var(--border-color);
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}
.timeline-item {
    position: relative;
    width: 50%;
    padding: 1rem 3rem;
    margin-bottom: 2rem;
}
.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}
.timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
}
.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 3px solid var(--accent-color);
    border-radius: 50%;
    top: 1.5rem;
    z-index: 10;
}
[data-theme="light"] .timeline-dot {
    border-color: var(--accent-hover);
}
.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
}
.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
}
.timeline-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}
[data-theme="light"] .timeline-date {
    color: var(--accent-hover);
}
.timeline-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-main);
}
.timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
}
.timeline-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* --- CONTACT SECTION --- */
.contact-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: flex-start;
}
.contact-info-cards {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.contact-info-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.8rem;
    display: flex;
    gap: 1.5rem;
    box-shadow: var(--shadow-main);
}
.contact-icon {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-top: 0.2rem;
}
[data-theme="light"] .contact-icon {
    color: var(--accent-hover);
}
.contact-info-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}
.contact-info-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}
.contact-action-link {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-color);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
[data-theme="light"] .contact-action-link {
    color: var(--accent-hover);
}
.contact-action-link:hover {
    gap: 0.5rem;
}
.contact-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.contact-form-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: var(--shadow-main);
}
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.form-group-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.form-group input, .form-group textarea {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
[data-theme="light"] .form-group input:focus, [data-theme="light"] .form-group textarea:focus {
    border-color: var(--accent-hover);
}
.form-feedback {
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 0.5rem;
    display: none;
}
.form-feedback.success {
    color: #10B981;
    display: block;
}
.form-feedback.error {
    color: #EF4444;
    display: block;
}

/* --- FOOTER --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2.5rem 0;
    margin-top: 5rem;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}
.copyright {
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.footer-links {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.footer-links a:hover {
    color: var(--text-primary);
}

/* --- BACK TO TOP BUTTON --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--accent-color);
    color: #FFFFFF;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: 999;
}
.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-3px);
}

/* --- SCROLL REVEAL STYLES --- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* --- RESPONSIVE MEDIA QUERIES --- */

/* Tablet & Mobile (Standard Screen Sizes) */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        padding-top: 3rem;
        min-height: auto;
    }
    .hero-visual {
        order: 2;
        max-width: 500px;
        margin: 0 auto;
    }
    .badge-1 { left: -10px; }
    .badge-2 { right: -10px; }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .about-image-wrapper {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    /* Fix visual card layout cut-offs & overlapping badges on mobile */
    .visual-card {
        transform: none !important;
        width: 100% !important;
        max-width: 100% !important;
        min-width: 0 !important;
    }
    .visual-card-wrapper:hover .visual-card {
        transform: none !important;
    }
    .visual-card-wrapper {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem 0 0.5rem 0;
        align-items: center;
        width: 100%;
        min-width: 0 !important;
    }
    .card-code-body {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }
    .card-code-body pre {
        white-space: pre-wrap !important;
        word-break: break-all !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    .floating-badge {
        position: relative !important;
        top: auto !important;
        bottom: auto !important;
        left: auto !important;
        right: auto !important;
        animation: none !important;
        width: 100% !important;
        max-width: 320px !important;
        box-sizing: border-box;
        margin: 0.2rem 0;
        transform: none !important;
    }

    /* Group theme toggle and hamburger on the right */
    .nav-container {
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
    }
    .logo {
        order: 1 !important;
    }
    .nav-actions {
        order: 2 !important;
        margin-left: auto !important;
    }
    .menu-toggle {
        order: 3 !important;
        margin-left: 1rem !important;
    }

    .section-padding {
        padding: 5rem 0 3rem 0;
    }
    .hero-title {
        font-size: 2.8rem;
    }
    .hero-subtitle {
        font-size: 1.4rem;
        min-height: 2rem;
    }
    
    /* Navbar menu for mobile */
    .menu-toggle {
        display: block;
    }
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--bg-secondary);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding: 3rem 0;
        gap: 2.5rem;
        transition: left var(--transition-normal);
        border-top: 1px solid var(--border-color);
        z-index: 999;
        box-shadow: var(--shadow-main);
    }
    .nav-menu.open {
        left: 0;
    }
    .nav-link {
        font-size: 1.2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .stat-card {
        padding: 1rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    /* Timeline to single sided */
    .timeline-wrapper::after {
        left: 20px;
    }
    .timeline-item {
        width: 100%;
        padding-left: 3rem;
        padding-right: 0;
        text-align: left !important;
    }
    .timeline-item:nth-child(even) {
        left: 0;
    }
    .timeline-dot {
        left: 11px !important;
        right: auto !important;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }
    .hero-ctas {
        flex-direction: column;
    }
    .btn {
        width: 100%;
    }
    .about-key-points {
        grid-template-columns: 1fr;
    }
    .form-group-row {
        grid-template-columns: 1fr;
    }
    .contact-form-wrapper {
        padding: 1.5rem;
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}