/* --- 1. VARIABLES & RESET --- */
:root {
    /* Colors */
    --primary-color: #0F172A;
    --secondary-color: #1E293B;
    --background-color: #0B1120;
    --accent-gradient: linear-gradient(90deg, #34D399, #10B981);
    --accent-color: #34D399;
    --accent-dark-color: #10B981;
    --text-light: #E2E8F0;
    --text-medium: #94A3B8;
    --text-dark: #64748B;
    --border-color: rgba(148, 163, 184, 0.2);

    /* Typography */
    --font-family: 'Inter', sans-serif;
    --fs-base: 1rem; /* 16px */
    --fs-sm: 0.875rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 2rem;
    --fs-4xl: clamp(2.5rem, 5vw, 4rem); /* Fluid typography */

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 1rem;
    --spacing-4: 1.5rem;
    --spacing-5: 2rem;
    --spacing-6: 3rem;
    --spacing-7: 4rem;

    /* Other */
    --border-radius: 0.75rem;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --header-height: 5rem;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    background-color: var(--background-color);
    color: var(--text-light);
    font-family: var(--font-family);
    font-size: var(--fs-base);
    line-height: 1.6;
}

ul { list-style: none; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; border: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 var(--spacing-4); }
.grid { display: grid; gap: var(--spacing-5); }
.section { padding: var(--spacing-7) 0; }

.section-title {
    font-size: var(--fs-3xl);
    text-align: center;
    margin-bottom: var(--spacing-6);
    position: relative;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* --- 2. REUSABLE COMPONENTS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: var(--accent-gradient);
    color: var(--primary-color);
    box-shadow: 0 5px 20px -5px rgba(52, 211, 153, 0.4);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px -8px rgba(52, 211, 153, 0.6);
}
.btn-secondary {
    background-color: transparent;
    color: var(--text-light);
    border: 2px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--secondary-color);
    border-color: var(--accent-color);
}

/* --- 3. HEADER & NAVIGATION --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    transition: var(--transition);
}
.header.scrolled {
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}
.nav-brand {
    font-size: var(--fs-2xl);
    font-weight: 800;
    color: var(--accent-color);
}
.nav-brand span {
    font-weight: 300;
    color: var(--text-light);
}
.nav-list {
    display: flex;
    gap: var(--spacing-5);
}
.nav-link {
    font-weight: 500;
    color: var(--text-medium);
    transition: var(--transition);
    position: relative;
}
.nav-link:hover, .nav-link.active-link {
    color: var(--text-light);
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}
.nav-link:hover::after, .nav-link.active-link::after {
    width: 100%;
}
.nav-toggle {
    display: none;
    font-size: var(--fs-xl);
    color: var(--text-light);
    background: none;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--secondary-color);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        padding: var(--spacing-7) var(--spacing-5);
        transition: right 0.4s ease-in-out;
    }
    .nav-menu.open { right: 0; }
    .nav-list { flex-direction: column; gap: var(--spacing-6); }
    .nav-link { font-size: var(--fs-lg); }
}

/* --- 4. HERO SECTION --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero-bg-pulse {
    position: absolute;
    inset: 0;
    background-color: var(--secondary-color);
    opacity: 0.1;
    animation: pulseBg 8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes pulseBg { 50% { opacity: 0.2; } }
.hero-container {
    grid-template-columns: 1fr;
    align-items: center;
    text-align: center;
}
@media (min-width: 768px) {
    .hero-container {
        grid-template-columns: 1.2fr 1fr;
        text-align: left;
    }
}
.hero-title {
    font-size: var(--fs-4xl);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-2);
}
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-subtitle {
    font-size: var(--fs-xl);
    color: var(--text-medium);
    font-weight: 500;
    margin-bottom: var(--spacing-4);
    height: 2rem; /* For stable layout during typing */
}
.hero-subtitle::after {
    content: '|';
    animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-description {
    max-width: 500px;
    margin: 0 auto var(--spacing-5);
}
@media (min-width: 768px) { .hero-description { margin-left: 0; } }
.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    justify-content: center;
    margin-bottom: var(--spacing-5);
}
@media (min-width: 768px) { .hero-buttons { justify-content: flex-start; } }
.hero-socials {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
}
@media (min-width: 768px) { .hero-socials { justify-content: flex-start; } }
.social-link {
    font-size: var(--fs-xl);
    color: var(--text-medium);
    transition: var(--transition);
}
.social-link:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}
.hero-image-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-6);
}
@media (min-width: 768px) { .hero-image-container { margin-top: 0; } }
.hero-image-blob {
    width: clamp(250px, 80%, 400px);
    aspect-ratio: 1;
    background: var(--accent-gradient);
    border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    animation: morph 8s ease-in-out infinite;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-image {
    width: 90%;
    height: 90%;
    object-fit: cover;
    border-radius: inherit;
}
@keyframes morph {
    0% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
    50% { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%; }
    100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
}

/* --- 5. ABOUT SECTION --- */
.about { background-color: var(--secondary-color); }
.about-container {
    grid-template-columns: 1fr;
    align-items: flex-start;
}
@media (min-width: 992px) { .about-container { grid-template-columns: 1fr 1fr; } }
.about-subtitle {
    font-size: var(--fs-2xl);
    margin-bottom: var(--spacing-4);
    color: var(--text-light);
}
.about-description {
    color: var(--text-medium);
    margin-bottom: var(--spacing-3);
}
.about-quote {
    padding-left: var(--spacing-3);
    border-left: 3px solid var(--accent-color);
    color: var(--text-medium);
    font-style: italic;
}
.skills-grid {
    display: grid;
    gap: var(--spacing-4);
}
.skill-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-2);
    font-weight: 500;
}
.skill-bar {
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 5px;
}
.skill-progress {
    height: 100%;
    width: 0;
    background: var(--accent-gradient);
    border-radius: 5px;
    transition: width 1.5s ease-out;
}

/* --- 6. SERVICES & PROJECTS (Card-based sections) --- */
.services-container, .projects-container {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.card {
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-5);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-gradient);
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.2);
}
.card:hover::before {
    transform: translateX(0);
}
.service-card-icon {
    font-size: var(--fs-3xl);
    margin-bottom: var(--spacing-3);
    color: var(--accent-color);
}
.card-title {
    font-size: var(--fs-xl);
    margin-bottom: var(--spacing-2);
    color: var(--text-light);
}
.card-description {
    color: var(--text-medium);
    font-size: var(--fs-sm);
}
.service-card .btn { margin-top: var(--spacing-4); }

.project-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}
.filter-btn {
    background-color: var(--secondary-color);
    color: var(--text-medium);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}
.filter-btn:hover {
    color: var(--text-light);
    background-color: #2c3a52;
}
.filter-btn.active {
    background: var(--accent-gradient);
    color: var(--primary-color);
}
.project-card .card-image {
    aspect-ratio: 16 / 9;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-4);
}
.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}
.project-card:hover img {
    transform: scale(1.05);
}
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}
.tag {
    background-color: var(--primary-color);
    color: var(--accent-color);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}
.project-links {
    display: flex;
    gap: var(--spacing-3);
    margin-top: var(--spacing-4);
}
.project-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--text-medium);
    font-weight: 500;
    transition: var(--transition);
}
.project-links a:hover {
    color: var(--accent-color);
}

/* --- 7. CONTACT SECTION --- */
.contact { background-color: var(--secondary-color); }
.contact-container {
    grid-template-columns: 1fr;
    align-items: center;
}
@media (min-width: 992px) { .contact-container { grid-template-columns: 1fr 1.2fr; } }
.contact-title {
    font-size: var(--fs-2xl);
    margin-bottom: var(--spacing-3);
}
.contact-description {
    color: var(--text-medium);
    margin-bottom: var(--spacing-5);
    max-width: 450px;
}
.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}
.contact-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--text-medium);
}
.contact-info-item i {
    color: var(--accent-color);
    font-size: var(--fs-lg);
}

.contact-form {
    width: 100%;
    background-color: var(--primary-color);
    padding: var(--spacing-6);
    border-radius: var(--border-radius);
}
.form-group {
    display: grid;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}
.contact-form input, .contact-form textarea {
    width: 100%;
    background-color: var(--secondary-color);
    color: var(--text-light);
    padding: var(--spacing-3);
    border-radius: 0.5rem;
    border: 2px solid transparent;
    transition: var(--transition);
}
.contact-form input::placeholder, .contact-form textarea::placeholder {
    color: var(--text-dark);
}
.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}
.form-submit-btn { width: 100%; }
.hidden-field { display: none; }

/* --- 8. FOOTER --- */
.footer {
    background-color: var(--primary-color);
    padding: var(--spacing-6) 0;
    border-top: 1px solid var(--border-color);
}
.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-5);
    align-items: start;
}
.footer-title {
    font-size: var(--fs-lg);
    color: var(--accent-color);
    margin-bottom: var(--spacing-3);
}
.footer-subtitle {
    font-size: var(--fs-base);
    color: var(--text-light);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}
.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}
.footer-links a {
    color: var(--text-medium);
    transition: var(--transition);
}
.footer-links a:hover {
    color: var(--accent-color);
    padding-left: var(--spacing-1);
}
.footer-social-links {
    display: flex;
    gap: var(--spacing-4);
}
.footer-social-links a {
    font-size: var(--fs-xl);
    color: var(--text-medium);
    transition: var(--transition);
}
.footer-social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}
.footer-copyright {
    text-align: center;
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-color);
    color: var(--text-dark);
    font-size: var(--fs-sm);
}

/* --- 9. MODAL --- */
.service-modal {
    position: fixed;
    inset: 0;
    background-color: rgba(11, 17, 32, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}
.service-modal.open {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: var(--secondary-color);
    padding: var(--spacing-6);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 100%;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.4s ease;
}
.service-modal.open .modal-content {
    transform: scale(1);
}
.modal-close-btn {
    position: absolute;
    top: var(--spacing-3);
    right: var(--spacing-3);
    background: none;
    color: var(--text-medium);
    font-size: var(--fs-2xl);
    cursor: pointer;
    transition: var(--transition);
}
.modal-close-btn:hover {
    color: var(--accent-color);
    transform: rotate(90deg);
}
#modal-body h3 {
    font-size: var(--fs-2xl);
    color: var(--accent-color);
    margin-bottom: var(--spacing-3);
}
#modal-body p {
    color: var(--text-medium);
    margin-bottom: var(--spacing-4);
}
#modal-body ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-5);
}
#modal-body li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-2);
    color: var(--text-medium);
}
#modal-body li i {
    color: var(--accent-color);
    margin-top: 5px;
}
.modal-buttons {
    display: flex;
    gap: var(--spacing-3);
}

/* --- 10. SCROLL REVEAL --- */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}