/* ==========================================================================
   Design Tokens & Advanced Theming
   ========================================================================== */
   :root {
    /* Fluid Typography Scale (Golden Ratio influenced) */
    --font-xs: clamp(0.75rem, 0.71rem + 0.18vw, 0.85rem);
    --font-sm: clamp(0.875rem, 0.82rem + 0.28vw, 1.05rem);
    --font-base: clamp(1rem, 0.93rem + 0.35vw, 1.25rem);
    --font-md: clamp(1.25rem, 1.15rem + 0.5vw, 1.6rem);
    --font-lg: clamp(1.5rem, 1.35rem + 0.75vw, 2.2rem);
    --font-xl: clamp(2rem, 1.7rem + 1.5vw, 3.2rem);
    --font-xxl: clamp(2.5rem, 2rem + 2.5vw, 4.5rem);
    --font-display: clamp(3rem, 2.5rem + 4vw, 6rem);

    /* Easing Functions (Apple-esque smoothness) */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out-quint: cubic-bezier(0.83, 0, 0.17, 1);
    --ease-elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6);
    --transition-base: 0.4s var(--ease-out-expo);

    /* Light Theme (Default fallback) */
    --bg-color: hsl(0, 0%, 98%);
    --bg-neural: hsl(0, 0%, 95%);
    --text-primary: hsl(240, 10%, 10%);
    --text-secondary: hsl(240, 5%, 40%);
    --accent: hsl(220, 90%, 56%);
    --accent-glow: hsla(220, 90%, 56%, 0.4);
    --accent-gradient: linear-gradient(135deg, hsl(220, 90%, 56%), hsl(280, 80%, 60%));
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
    --nav-bg: rgba(255, 255, 255, 0.85);
    --input-bg: rgba(255, 255, 255, 0.9);
    --input-border: rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --bg-color: hsl(240, 10%, 4%);
    --bg-neural: hsl(240, 10%, 6%);
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(240, 5%, 70%);
    --accent: hsl(220, 90%, 65%);
    --accent-glow: hsla(220, 90%, 65%, 0.4);
    --accent-gradient: linear-gradient(135deg, hsl(220, 90%, 65%), hsl(280, 80%, 65%));
    
    --glass-bg: rgba(20, 20, 30, 0.4);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    --nav-bg: rgba(10, 10, 15, 0.85);
    --input-bg: rgba(0, 0, 0, 0.5);
    --input-border: rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   Reset & Base & Scrollbars
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color 0.5s var(--ease-out-expo), color 0.5s var(--ease-out-expo);
}

::selection {
    background: var(--accent-glow);
    color: var(--text-primary);
}

::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Background Effects */
.bg-neural {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: radial-gradient(circle at 10% 40%, var(--accent-glow) 0%, transparent 40%),
                radial-gradient(circle at 90% 60%, hsla(280, 80%, 65%, 0.2) 0%, transparent 40%);
    filter: blur(60px);
    z-index: -2;
    pointer-events: none;
    transition: all 1s ease;
}

/* Custom Cursor Glow */
.cursor-glow {
    position: fixed;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: -1;
    transition: width 0.3s, height 0.3s;
    opacity: 0.5;
}

/* ==========================================================================
   Typography Master
   ========================================================================== */
h1, h2, h3, h4, h5, h6, .logo {
    font-family: 'Outfit', system-ui, sans-serif;
    line-height: 1.1;
    margin-bottom: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.container {
    width: 90%;
    max-width: 1140px;
    margin: 0 auto;
}

.section-padding {
    padding: clamp(6rem, 12vw, 12rem) 0;
}

.section-title {
    font-size: var(--font-xl);
    text-align: center;
    margin-bottom: clamp(3rem, 6vw, 5rem);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    width: 100%;
}

/* ==========================================================================
   Glassmorphism & Advanced Cards
   ========================================================================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    padding: clamp(2rem, 4vw, 3.5rem);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* Animated Gradient Border Effect on Hover */
.glass-card::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 24px;
    padding: 2px;
    background: var(--accent-gradient);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.glass-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2);
}

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

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0; width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    padding: 1.2rem 0;
    transition: padding var(--transition-base), background var(--transition-base);
}

.navbar.scrolled {
    padding: 0.8rem 0;
    box-shadow: var(--glass-shadow);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1140px;
    margin: 0 auto;
}

.logo {
    font-size: var(--font-lg);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--font-sm);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scale(0);
    background: var(--accent);
    transition: transform var(--transition-base);
}

.nav-links a:hover::after, .nav-links a.active::after {
    transform: translateX(-50%) scale(1);
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    border-radius: 50%;
    transition: transform var(--transition-base), background var(--transition-base);
}
#theme-toggle:hover {
    background: var(--glass-border);
    transform: rotate(15deg);
}

.sun-icon, .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: block; }

.menu-toggle { display: none; cursor: pointer; color: var(--text-primary); }
.mobile-menu {
    display: none; flex-direction: column; padding: 1rem 5%;
    background: var(--nav-bg); border-bottom: 1px solid var(--glass-border);
    position: absolute; width: 100%; top: 100%;
}
.mobile-menu.active { display: flex; }
.mobile-menu a { padding: 1rem 0; color: var(--text-secondary); border-bottom: 1px solid var(--glass-border); }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .menu-toggle { display: block; }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url('../img/hero.png');
    background-size: cover;
    background-position: center;
    opacity: 0.2;
    z-index: -1;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 100%);
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 50%, rgba(0,0,0,0) 100%);
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
    margin-top: 5vh;
}

.hero-text .subtitle {
    font-size: var(--font-base);
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-family: 'Outfit', sans-serif;
}

.hero-text .title {
    font-size: var(--font-display);
    line-height: 1.05;
    margin: 0.5rem 0;
}

.hero-text .role {
    font-size: var(--font-lg);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    display: inline-block;
}

.hero-text .description {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin: 2rem 0 3rem;
    max-width: 540px;
}

/* Magnetic Buttons */
.hero-btns { display: flex; gap: 1.5rem; }
.btn {
    padding: 1rem 2.5rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: var(--font-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-color);
    border: none;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 12px 32px var(--accent-glow);
}

/* Parallax Visual Card */
.visual-card {
    padding: 0;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    background: transparent;
    border: none;
    box-shadow: none;
    animation: float 8s var(--ease-in-out-quint) infinite;
    transform-style: preserve-3d;
    perspective: 1000px;
}
.visual-card::before { display: none; } /* Remove gradient border from circle */
.visual-card:hover { transform: translateY(0); box-shadow: none; }

.avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: 0 20px 60px var(--accent-glow);
    transition: transform 0.1s ease-out, box-shadow 0.1s ease-out;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(2deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

@media (max-width: 992px) {
    .hero-content { grid-template-columns: 1fr; text-align: center; }
    .hero-text .description { margin: 1.5rem auto 3rem; }
    .hero-btns { justify-content: center; }
    .visual-card { max-width: 350px; margin: 0 auto; }
}

/* ==========================================================================
   Fiber-Optic Timeline (Experience)
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0; left: 30px;
    height: 100%; width: 2px;
    background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 4.5rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 24px; top: 40px;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--bg-color);
    border: 3px solid var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
    z-index: 2;
    transition: transform var(--transition-base), background var(--transition-base);
}

.timeline-item:hover::before {
    transform: scale(1.5);
    background: var(--accent);
}

.timeline-date {
    font-size: var(--font-sm);
    color: var(--accent);
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: 'Outfit', sans-serif;
    letter-spacing: 1px;
}

.timeline-item h4 {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-bottom: 1.5rem;
}
.timeline-logo {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    object-fit: contain;
    background: #ffffff; /* pure white background prevents transparent dark logos from vanishing */
    padding: 6px;
    box-shadow: 0 4px 15px var(--accent-glow);
    flex-shrink: 0;
}
.timeline-header-text h3 {
    margin-bottom: 0.1rem;
}
.timeline-header-text h4, .timeline-header-text p {
    margin-bottom: 0;
}

.timeline-item ul {
    list-style-type: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.timeline-item li {
    position: relative;
    padding-left: 1.8rem;
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-item li::before {
    content: '→';
    position: absolute;
    left: 0; top: 0;
    color: var(--accent);
    font-weight: 800;
}

@media (max-width: 768px) {
    .timeline::before { left: 20px; }
    .timeline-item { padding-left: 3.5rem; }
    .timeline-item::before { left: 14px; }
}

/* ==========================================================================
   Skills Grid & About
   ========================================================================== */
.about-card p {
    font-size: var(--font-md);
    line-height: 1.8;
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.about-card p strong { color: var(--text-primary); }

.skills-grid, .acc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.skill-category {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-category .icon-wrapper {
    width: 60px; height: 60px;
    border-radius: 16px;
    background: var(--glass-border);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base), background var(--transition-base), color var(--transition-base);
}

.skill-category:hover .icon-wrapper {
    transform: translateY(-5px) rotate(5deg);
    background: var(--accent);
    color: #fff;
    box-shadow: 0 10px 20px var(--accent-glow);
}

.acc-grid .glass-card h3 { font-size: var(--font-md); margin-bottom: 0.5rem; }
.acc-grid .glass-card p strong { color: var(--text-primary); }

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 5rem;
    align-items: center;
}

.contact-info h2 { font-size: var(--font-xl); }
.contact-info p { font-size: var(--font-base); color: var(--text-secondary); margin-bottom: 2rem; }

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    width: 50px; height: 50px;
    border-radius: 50%;
    background: var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.social-links a.social-linkedin { color: #0077b5; }
.social-links a.social-linkedin:hover { background: #0077b5; color: #fff; box-shadow: 0 10px 25px rgba(0, 119, 181, 0.4); }

.social-links a.social-twitter { color: #1da1f2; }
.social-links a.social-twitter:hover { background: #1da1f2; color: #fff; box-shadow: 0 10px 25px rgba(29, 161, 242, 0.4); }

.social-links a.social-github { color: var(--text-primary); }
.social-links a.social-github:hover { background: var(--text-primary); color: var(--bg-color); box-shadow: 0 10px 25px rgba(255, 255, 255, 0.2); }

.social-links a.social-credly { color: #f96d00; }
.social-links a.social-credly:hover { background: #f96d00; color: #fff; box-shadow: 0 10px 25px rgba(249, 109, 0, 0.4); }

.form-group { margin-bottom: 2rem; }
.form-group label {
    display: block; margin-bottom: 0.8rem;
    font-size: var(--font-sm); font-weight: 600; font-family: 'Outfit', sans-serif;
    color: var(--text-primary); letter-spacing: 1px; text-transform: uppercase;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 1.2rem 1.5rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit; font-size: var(--font-base);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
    transition: all var(--transition-base);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--glass-bg);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.btn-submit { width: 100%; gap: 0.8rem; padding: 1.2rem; font-size: var(--font-base); }

@media (max-width: 768px) {
    .contact-wrapper { grid-template-columns: 1fr; gap: 3rem; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
    padding: 3rem 0; text-align: center;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary); font-size: var(--font-sm);
    margin-top: 4rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s var(--ease-out-expo), transform 1s var(--ease-out-expo);
}

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