/* ========================================
   VARIABLES & RESET
   ======================================== */

:root {
    /* Colors */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-bg-card: rgba(26, 26, 26, 0.6);
    --color-accent-primary: #00d4ff;
    --color-accent-secondary: #667eea;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    --gradient-overlay: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.8));
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 1.5rem;
    --gap-small: 1rem;
    --gap-medium: 2rem;
    --gap-large: 3rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-h1: 3.5rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 1.75rem;
    --font-size-body: 1rem;
    --font-size-small: 0.875rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Borders */
    --border-radius: 12px;
    --border-radius-small: 8px;
    
    /* Shadows */
    --shadow-small: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-large: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-accent: 0 0 30px rgba(0, 212, 255, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   UTILITIES
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
    position: relative;
}

.section__header {
    text-align: center;
    margin-bottom: 4rem;
}

.section__subtitle {
    display: inline-block;
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.section__title {
    font-size: var(--font-size-h2);
    font-weight: 800;
    color: var(--color-text-primary);
    position: relative;
    display: inline-block;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: var(--font-size-body);
    position: relative;
    overflow: hidden;
}

.button--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-accent);
}

.button--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
}

.button--ghost {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.button--ghost:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    transform: translateY(-2px);
}

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

.button--outline:hover {
    background: var(--color-accent-primary);
    color: white;
}

.button--full {
    width: 100%;
    justify-content: center;
}

.button__icon {
    transition: transform var(--transition-normal);
}

.button:hover .button__icon {
    transform: translateX(4px);
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition-normal);
    padding: 1.5rem 0;
}

.header.scroll-header {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    box-shadow: var(--shadow-small);
}

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

.nav__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.nav__logo:hover {
    color: var(--color-accent-primary);
}

.nav__list {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav__link {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color var(--transition-fast);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav__link:hover,
.nav__link.active-link {
    color: var(--color-accent-primary);
}

.nav__link:hover::after,
.nav__link.active-link::after {
    width: 100%;
}

.nav__cta {
    padding: 0.5rem 1.5rem;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-small);
    color: white !important;
}

.nav__cta::after {
    display: none;
}

.nav__cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

/* Mobile menu toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav__toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

/* ========================================
   HOME SECTION
   ======================================== */

.home {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.home__container {
    position: relative;
    z-index: 2;
}

.home__content {
    max-width: 700px;
}

.home__subtitle {
    font-size: 1.1rem;
    color: var(--color-accent-primary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.home__title {
    font-size: var(--font-size-h1);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.home__role {
    font-size: 1.8rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.home__description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

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

/* Decorative elements */
.home__decoration {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.decoration-circle {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.1;
    filter: blur(80px);
    animation: float 20s ease-in-out infinite;
}

.decoration-circle--1 {
    width: 400px;
    height: 400px;
    top: 10%;
    right: -100px;
}

.decoration-circle--2 {
    width: 300px;
    height: 300px;
    bottom: 20%;
    right: 10%;
    animation-delay: -10s;
}

.decoration-line {
    position: absolute;
    top: 50%;
    right: 0;
    width: 2px;
    height: 200px;
    background: var(--gradient-primary);
    opacity: 0.3;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(180deg); }
}

/* Scroll indicator */
.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: var(--color-accent-primary);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: var(--color-accent-primary);
    animation: scrollAnimation 2s ease-in-out infinite;
}

@keyframes scrollAnimation {
    0% { transform: translateY(-20px); opacity: 0; }
    50% { opacity: 1; }
    100% { transform: translateY(40px); opacity: 0; }
}

/* ========================================
   ABOUT SECTION
   ======================================== */

.about {
    background: var(--color-bg-secondary);
}

.about__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-large);
    align-items: center;
}

.about__description {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about__info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2.5rem 0;
    padding: 2rem 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about__info-item {
    text-align: center;
}

.about__info-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.about__info-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.about__image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.about__image-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0.1;
    z-index: 1;
}

.about__placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
}

.about__placeholder svg {
    width: 100px;
    height: 100px;
    color: var(--color-accent-primary);
    opacity: 0.3;
}

/* ========================================
   SKILLS SECTION
   ======================================== */

.skills__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--gap-medium);
}

.skills__category {
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.skills__category:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-accent);
}

.skills__category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.skills__category-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-small);
    color: white;
}

.skills__category-title {
    font-size: 1.5rem;
    font-weight: 700;
}

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

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

.skill__name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.skill__bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.skill__percentage {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 1s ease;
    position: relative;
}

.skill__percentage::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ========================================
   PROJECTS SECTION
   ======================================== */

.projects {
    background: var(--color-bg-secondary);
}

.projects__container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--gap-medium);
}

.project__card {
    background: var(--color-bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.project__card:hover {
    transform: translateY(-10px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-accent);
}

.project__image {
    position: relative;
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
}

.project__image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent-primary);
    opacity: 0.3;
}

.project__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project__card:hover .project__overlay {
    opacity: 1;
}

.project__link {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: transform var(--transition-fast);
}

.project__link:hover {
    transform: scale(1.1);
}

.project__content {
    padding: 1.5rem;
}

.project__title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
}

.project__description {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.project__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project__tag {
    padding: 0.25rem 0.75rem;
    background: rgba(0, 212, 255, 0.1);
    color: var(--color-accent-primary);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

/* ========================================
   CONTACT SECTION
   ======================================== */

.contact__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-large);
}

.contact__info-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.contact__info-description {
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.contact__detail {
    display: flex;
    gap: 1rem;
}

.contact__detail-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-small);
    color: var(--color-accent-primary);
    flex-shrink: 0;
}

.contact__detail-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.contact__detail-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.contact__detail-value {
    color: var(--color-text-primary);
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a.contact__detail-value:hover {
    color: var(--color-accent-primary);
}

.contact__social {
    display: flex;
    gap: 1rem;
}

.contact__social-link {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-small);
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
}

.contact__social-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    transform: translateY(-3px);
}

/* Contact Form */
.contact__form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form__group {
    position: relative;
}

.form__input {
    width: 100%;
    padding: 1rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-small);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    transition: all var(--transition-normal);
    outline: none;
}

.form__input:focus {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form__label {
    position: absolute;
    left: 1rem;
    top: 1rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    pointer-events: none;
}

.form__input:focus ~ .form__label,
.form__input:not(:placeholder-shown) ~ .form__label {
    top: -0.5rem;
    left: 0.75rem;
    font-size: 0.75rem;
    color: var(--color-accent-primary);
    background: var(--color-bg-primary);
    padding: 0 0.5rem;
}

.form__textarea {
    resize: vertical;
    min-height: 150px;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background: var(--color-bg-secondary);
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--color-border);
}

.footer__container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--gap-large);
    margin-bottom: 3rem;
}

.footer__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    text-decoration: none;
    margin-bottom: 1rem;
    display: inline-block;
}

.footer__description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.footer__links {
    display: contents;
}

.footer__title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
}

.footer__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer__link {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-accent-primary);
}

.footer__bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer__copy {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   SCROLL UP BUTTON
   ======================================== */

.scrollup {
    position: fixed;
    right: 2rem;
    bottom: -20%;
    background: var(--gradient-primary);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-small);
    color: white;
    transition: all var(--transition-normal);
    z-index: 10;
    box-shadow: var(--shadow-accent);
}

.scrollup:hover {
    transform: translateY(-5px);
}

.scrollup.show-scroll {
    bottom: 3rem;
}

/* ========================================
   ANIMATIONS (AOS fallback)
   ======================================== */

[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
    transform: translateX(0);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
    transform: translateX(0);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media screen and (max-width: 968px) {
    :root {
        --font-size-h1: 2.5rem;
        --font-size-h2: 2rem;
        --font-size-h3: 1.5rem;
        --section-padding: 80px 0;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        padding: 6rem 2rem 2rem;
        transition: right var(--transition-normal);
        box-shadow: var(--shadow-large);
    }

    .nav__menu.show-menu {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        gap: 2rem;
    }

    .nav__link {
        font-size: 1.1rem;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }

    .nav__toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav__toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .about__container,
    .contact__container {
        grid-template-columns: 1fr;
    }

    .about__info {
        grid-template-columns: repeat(2, 1fr);
    }

    .home__buttons {
        flex-direction: column;
    }

    .button {
        width: 100%;
        justify-content: center;
    }

    .footer__container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer__list {
        align-items: center;
    }
}

@media screen and (max-width: 576px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.5rem;
        --section-padding: 60px 0;
    }

    .section__header {
        margin-bottom: 3rem;
    }

    .home__decoration {
        width: 100%;
    }

    .decoration-circle--1 {
        width: 250px;
        height: 250px;
    }

    .decoration-circle--2 {
        width: 200px;
        height: 200px;
    }

    .about__info {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .skills__container,
    .projects__container {
        grid-template-columns: 1fr;
    }

    .scrollup {
        right: 1rem;
    }

    .scrollup.show-scroll {
        bottom: 2rem;
    }
}

/* ========================================
   PERFORMANCE & ACCESSIBILITY
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}