/* --- Cyber-Minimalism Theme --- */
:root {
    --bg-color: #050505;
    --card-bg: rgba(20, 20, 25, 0.6);
    --text-primary: #e5e5e5;
    --text-secondary: #a0a0a0;
    --accent-primary: #00dc82;
    /* Green */
    --accent-secondary: #30dcd4;
    /* Teal */
    --accent-glow: rgba(0, 220, 130, 0.5);
    --border-color: rgba(255, 255, 255, 0.08);
    --grid-color: rgba(255, 255, 255, 0.03);
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --header-bg: rgba(5, 5, 5, 0.8);
    --mobile-menu-bg: rgba(5, 5, 5, 0.95);
    --heading-color: #ffffff;
    --btn-secondary-bg: rgba(255, 255, 255, 0.05);
    --btn-secondary-color: #fff;
    --btn-secondary-border: var(--border-color);
    --gradient-text-start: #fff;
    --code-bg: rgba(15, 15, 20, 0.8);
    --code-border: var(--border-color);
}

[data-theme="light"] {
    --bg-color: #f5f5f0;
    --card-bg: rgba(235, 235, 230, 0.6);
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --border-color: rgba(0, 0, 0, 0.1);
    --grid-color: rgba(0, 0, 0, 0.04);
    /* Adjust accent glow for light mode visibility */
    --accent-glow: rgba(0, 220, 130, 0.2);
    --header-bg: rgba(245, 245, 240, 0.9);
    --mobile-menu-bg: rgba(245, 245, 240, 0.98);
    --heading-color: #1a1a1a;
    --btn-secondary-bg: rgba(0, 0, 0, 0.05);
    --btn-secondary-color: #1a1a1a;
    --btn-secondary-border: rgba(0, 0, 0, 0.1);
    --gradient-text-start: #1a1a1a;
    --code-bg: #ededea;
    --code-border: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
    /* Adjust based on header height */
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    /* Subtle Grid Background */
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: 40px 40px;
    }
}

#cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 220, 130, 0.06), transparent 40%);
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--heading-color);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* --- Layout Utilities --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
    position: relative;
}

/* --- Header & Nav --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: transform 0.3s ease, background 0.3s ease, padding 0.3s ease;
}

header.sticky-navbar-hide {
    transform: translateY(-100%);
}

header.sticky-navbar-show {
    transform: translateY(0);
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transition: width 0.3s ease;
}

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

/* --- Hero Section --- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 0;
    /* Center vertically */
}

.hero-title {
    font-size: 3rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 4.5rem;
    }
}

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

.accent-text {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary), var(--accent-primary));
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-flow 3s linear infinite;
}

/* --- Vertical Text Slider (Kept from previous fix) --- */
.sliding-text-container {
    height: 1.2em;
    line-height: 1.2;
    overflow: hidden;
    display: inline-flex;
    flex-direction: column;
    vertical-align: bottom;
    margin-top: 0;
}

.sliding-text-content {
    display: block;
    animation: slide-vertical 10s infinite cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.sliding-text-item {
    height: 1.2em;
    line-height: 1.2;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Centered for hero */
    white-space: nowrap;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary), var(--accent-primary));
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-flow 3s linear infinite;
}

@keyframes gradient-flow {
    to {
        background-position: 200% center;
    }
}

@keyframes slide-vertical {

    0%,
    14% {
        transform: translateY(0);
    }

    17%,
    30% {
        transform: translateY(-1.2em);
    }

    33%,
    47% {
        transform: translateY(-2.4em);
    }

    50%,
    64% {
        transform: translateY(-3.6em);
    }

    67%,
    80% {
        transform: translateY(-4.8em);
    }

    83%,
    100% {
        transform: translateY(-6.0em);
    }
}

/* Mobile adjustments for slider */
@media (max-width: 768px) {
    .sliding-text-container {
        height: 1.3em;
    }

    .sliding-text-item {
        height: 1.3em;
    }

    @keyframes slide-vertical {

        0%,
        14% {
            transform: translateY(0);
        }

        17%,
        30% {
            transform: translateY(-1.3em);
        }

        33%,
        47% {
            transform: translateY(-2.6em);
        }

        50%,
        64% {
            transform: translateY(-3.9em);
        }

        67%,
        80% {
            transform: translateY(-5.2em);
        }

        83%,
        100% {
            transform: translateY(-6.5em);
        }
    }
}


/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary), var(--accent-primary));
    background-size: 200% auto;
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
    animation: gradient-flow 3s linear infinite;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow);
}

.btn-secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-color);
    border-color: var(--btn-secondary-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--heading-color);
}

/* --- Cards (Projects/Experience) --- */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
}

.tech-tag {
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent-primary);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

/* --- Timeline --- */
.timeline-item {
    position: relative;
    padding-left: 2rem;
    padding-bottom: 3rem;
    border-left: 2px solid var(--border-color);
}

.timeline-item:last-child {
    border-left-color: transparent;
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-primary);
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* --- Animations --- */
.fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}

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

.delay-100 {
    animation-delay: 0.1s;
}

.delay-200 {
    animation-delay: 0.2s;
}

.delay-300 {
    animation-delay: 0.3s;
}

/* --- Mobile Menu --- */
#mobile-menu {
    background: var(--mobile-menu-bg);
    backdrop-filter: blur(20px);
}