/* ==================== CSS VARIABLES ==================== */
:root {
    --primary-color: #00d4ff;
    --primary-dark: #00a8cc;
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252d3d;
    --text-primary: #ffffff;
    --text-secondary: #b0b8c1;
    --text-muted: #7a8292;
    --border-color: #2a3344;
    --accent-purple: #7c3aed;
    --success-color: #10b981;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    letter-spacing: 0.3px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
}

/* ==================== NAVBAR ==================== */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(26, 31, 46, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

/* ==================== MAIN CONTENT ==================== */
main {
    min-height: calc(100vh - 60px - 200px);
}

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

.page-section {
    padding: 4rem 0;
}

/* ==================== HERO SECTION ==================== */
.hero {
    padding: 6rem 0 4rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-text {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 212, 255, 0.3);
    color: var(--bg-primary);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    transform: translateY(-2px);
}

.profile-image {
    width: 100%;
    max-width: 400px;
    border-radius: 1rem;
    border: 2px solid var(--border-color);
    transition: transform 0.3s ease;
}

.hero-image:hover .profile-image {
    transform: scale(1.02);
}

/* ==================== ABOUT PREVIEW SECTION ==================== */
.about-preview {
    padding: 4rem 0;
}

.about-preview h2,
.page-section h1,
.page-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.preview-card,
.skill-card,
.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
}

.preview-card:hover,
.skill-card:hover,
.project-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 212, 255, 0.1);
}

.preview-card h3,
.skill-card h3,
.project-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.preview-card p,
.skill-card p,
.project-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

/* ==================== ABOUT PAGE ==================== */
.page-section h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
    align-items: center;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.lead-text {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

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

.profile-image-about {
    width: 100%;
    max-width: 350px;
    border-radius: 1rem;
    border: 2px solid var(--border-color);
    transition: transform 0.3s ease;
}

.about-image:hover .profile-image-about {
    transform: scale(1.02);
}

.skills-section,
.goals-section {
    margin: 4rem 0;
}

.skills-section h2,
.goals-section h2 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.skill-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 212, 255, 0.1);
}

.skill-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.goals-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
}

.goals-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.goals-list {
    list-style: none;
    padding-left: 0;
}

.goals-list li {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.95rem;
}

.goals-list li:before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ==================== PROJECTS PAGE ==================== */
.projects-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    height: 100%;
}

.project-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(0, 212, 255, 0.12);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.project-card h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    flex: 1;
}

.tech-tag {
    background-color: var(--accent-purple);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.projects-note {
    background-color: var(--bg-secondary);
    border: 1px dashed var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
}

.projects-note p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ==================== CONTACT PAGE ==================== */
.contact-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.contact-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
}

.contact-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 12px 24px rgba(0, 212, 255, 0.1);
}

.contact-card h3 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-label {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.contact-item p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.contact-message {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
}

.contact-message p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.contact-message strong {
    color: var(--primary-color);
}

/* ==================== FOOTER ==================== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
}

.footer-container p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 0 1rem;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .intro-text {
        font-size: 1.05rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .profile-image {
        max-width: 300px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .profile-image-about {
        max-width: 250px;
        margin: 0 auto;
    }

    .nav-container {
        padding: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        font-size: 0.9rem;
    }

    .page-section h1,
    .about-preview h2 {
        font-size: 2rem;
    }

    .about-preview {
        padding: 2rem 1rem;
    }

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

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

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

    .page-section {
        padding: 2rem 1rem;
    }

    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 0.95rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .intro-text {
        font-size: 1rem;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 0.75rem;
        flex-direction: column;
    }

    .page-section h1,
    .about-preview h2 {
        font-size: 1.75rem;
    }

    .preview-card h3,
    .skill-card h3,
    .project-card h3 {
        font-size: 1.1rem;
    }

    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .tech-tag {
        align-self: flex-start;
    }
}