/* =========================================
   1. Design System & CSS Variables
   ========================================= */
:root {
    /* Colors - Light Mode (Default) */
    --primary-color: #008080;
    /* Teal/cyan for AI vibe */
    --secondary-color: #005f5f;
    --accent-color: #00ffff;
    /* Neon cyan */
    --bg-color: #ffffff;
    --text-color: #333333;
    --card-bg: #f5f5f5;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --border-color: #e0e0e0;

    /* Fonts */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', sans-serif;

    /* Spacing */
    --section-padding: 80px 20px;
    --container-width: 1200px;

    /* Transitions */
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    /* Colors - Dark Mode */
    --primary-color: #00e5e5;
    --secondary-color: #00b2b2;
    --accent-color: #ff00ff;
    /* Neon magenta accent */
    --bg-color: #0a0a0a;
    /* Deep dark background */
    --text-color: #e0e0e0;
    --card-bg: #1a1a1a;
    --nav-bg: rgba(10, 10, 10, 0.95);
    --border-color: #333333;
}

/* =========================================
   2. Reset & Global Styles
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

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

ul {
    list-style: none;
}

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

/* =========================================
   3. Utility Classes
   ========================================= */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 229, 229, 0.3);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}


/* =========================================
   4. Navbar
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-heading);
}

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

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
}

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

/* Theme Toggle Button */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 5px;
}

.hamburger {
    display: none;
    cursor: pointer;
}

/* =========================================
   5. Hero Section
   ========================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-text {
    flex: 1;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    font-weight: 600;
}

.title {
    font-family: var(--font-heading);
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 20px;
}

.role {
    font-size: 1.5rem;
    color: #888;
    margin-bottom: 30px;
}

.highlight {
    color: var(--primary-color);
}

.description {
    font-size: 1.1rem;
    margin-bottom: 40px;
    max-width: 500px;
    color: #666;
}

[data-theme="dark"] .description {
    color: #bbb;
}

.hero-btns {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.img-wrapper {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid var(--primary-color);
    box-shadow: 0 0 30px rgba(0, 128, 128, 0.2);
}

.img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* =========================================
   6. Cards & Grids
   ========================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.project-card,
.cert-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.project-card:hover,
.cert-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.folder-icon {
    color: var(--primary-color);
    width: 40px;
    height: 40px;
}

.card-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.card-desc {
    font-size: 0.95rem;
    color: #777;
    margin-bottom: 20px;
    line-height: 1.5;
    height: 60px;
    /* limit height */
    overflow: hidden;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #888;
}

/* Certificates */
.certificates-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 20px;
}

.cert-icon {
    background: rgba(0, 128, 128, 0.1);
    padding: 15px;
    border-radius: 50%;
    color: var(--primary-color);
}

.view-btn {
    display: inline-block;
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* Contact Form */
.contact-wrapper {
    display: flex;
    gap: 50px;
}

.contact-info {
    flex: 1;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.contact-form {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    font-family: var(--font-main);
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 100px;
    color: #666;
}

/* Skills Tags */
.skill-category {
    margin-bottom: 40px;
}

.skill-category h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.skill-tags span {
    background: var(--card-bg);
    padding: 10px 20px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
    font-weight: 500;
    transition: var(--transition);
}

.skill-tags span:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Timeline */
.timeline {
    border-left: 2px solid var(--border-color);
    margin-left: 20px;
    padding-left: 30px;
}

.timeline-item {
    margin-bottom: 40px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -37px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 600;
}