/* =====================================================
   AIYAN AHMED — Cloud Engineer Portfolio
   Swiss International Style + Neo-Brutalist Tech Design
   ===================================================== */

/* CSS Variables */
:root {
    /* Color Palette */
    --concrete-gray: #E8E8E8;
    --jet-black: #111111;
    --industrial-orange: #FF4D00;
    --tech-blue: #3B82F6;
    --stark-white: #FFFFFF;
    
    /* Typography */
    --font-display: 'Inter', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing System */
    --border-thick: 4px solid var(--jet-black);
    --border-medium: 2px solid var(--jet-black);
    --border-thin: 1px solid var(--jet-black);

    /* Grid System */
    --section-padding: 100px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-mono);
    background-color: var(--concrete-gray);
    color: var(--jet-black);
    line-height: 1.6;
    overflow-x: hidden;
    cursor: none;
}

/* Custom Cursor */
.cursor {
    position: fixed;
    width: 20px;
    height: 20px;
    background-color: var(--industrial-orange);
    border-radius: 50%;
    pointer-events: none;
    z-index: 10000;
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
    transition: transform 0.1s ease, width 0.2s ease, height 0.2s ease;
}

.cursor.hover {
    width: 50px;
    height: 50px;
    background-color: var(--tech-blue);
}

/* Loading Curtain */
.curtain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--jet-black);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(0);
    transition: transform 0.6s cubic-bezier(0.76, 0, 0.24, 1);
}

.curtain.hidden {
    transform: translateY(-100%);
}

.curtain-text {
    font-family: var(--font-display);
    font-size: clamp(2rem, 8vw, 6rem);
    font-weight: 900;
    color: var(--industrial-orange);
    letter-spacing: -0.05em;
    text-transform: uppercase;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.03em;
    line-height: 0.95;
}

a {
    color: inherit;
    text-decoration: none;
}

/* =====================================================
   HEADER
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: var(--concrete-gray);
    border-bottom: var(--border-thick);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.header-container {
    width: 100%;
    max-width: 1920px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 0.9;
}

.logo-main {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.logo-sub {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 30px;
}

.location {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.nav {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--industrial-orange);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: var(--border-thick);
    cursor: pointer;
    position: relative;
}

.menu-line {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 2px;
    background-color: var(--jet-black);
    transition: transform var(--transition-medium);
}

.menu-line:first-child {
    transform: translate(-50%, -50%) rotate(0deg);
}

.menu-line:last-child {
    transform: translate(-50%, -50%) rotate(0deg);
}

.menu-toggle.active .menu-line:first-child {
    transform: translate(-50%, -50%) rotate(45deg);
}

.menu-toggle.active .menu-line:last-child {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--jet-black);
    z-index: 999;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20px;
    transform: translateX(100%);
    transition: transform var(--transition-medium);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav-link {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--stark-white);
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
    color: var(--industrial-orange);
}

/* =====================================================
   HERO SECTION
   ===================================================== */
.hero {
    padding-top: 70px;
    min-height: 100vh;
    border-bottom: var(--border-thick);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    min-height: calc(100vh - 70px);
}

.hero-content {
    padding: 80px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-right: var(--border-thick);
}

.hero-title {
    display: flex;
    flex-direction: column;
}

.hero-line {
    font-size: clamp(3.5rem, 10vw, 8rem);
    line-height: 0.85;
    letter-spacing: -0.06em;
}

.hero-line.accent {
    color: var(--industrial-orange);
}

.hero-manifesto {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 480px;
    margin-top: 50px;
}

.hero-meta {
    display: flex;
    gap: 50px;
    margin-top: 60px;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.meta-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
}

.meta-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
}

.hero-image-wrapper {
    position: relative;
    overflow: hidden;
    background-color: var(--jet-black);
}

.hero-image {
    width: 100%;
    height: 100%;
}

.hero-image svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
}

.image-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--stark-white);
    letter-spacing: 0.1em;
}

/* =====================================================
   MARQUEE SECTION
   ===================================================== */
.marquee-section {
    border-bottom: var(--border-thick);
}

.marquee-border {
    height: 4px;
    background-color: var(--jet-black);
}

.marquee {
    overflow: hidden;
    padding: 30px 0;
    background-color: var(--jet-black);
}

.marquee-content {
    display: flex;
    gap: 50px;
    animation: scroll 25s linear infinite;
    white-space: nowrap;
}

.marquee-item {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--stark-white);
    letter-spacing: -0.02em;
    text-transform: uppercase;
    flex-shrink: 0;
}

.marquee-separator {
    color: var(--industrial-orange);
    font-size: 1.2rem;
    flex-shrink: 0;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* =====================================================
   SKILLS SECTION
   ===================================================== */
.skills {
    padding: var(--section-padding) 0;
    border-bottom: var(--border-thick);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.skill-category {
    padding: 50px;
    border-right: var(--border-thick);
}

.skill-category:last-child {
    border-right: none;
}

.skill-category-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: var(--border-medium);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #ddd;
}

.skill-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
}

.skill-level {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--tech-blue);
}

.skill-item:hover {
    background-color: var(--industrial-orange);
    padding-left: 15px;
    padding-right: 15px;
    margin-left: -15px;
    margin-right: -15px;
}

.skill-item:hover .skill-name,
.skill-item:hover .skill-level {
    color: var(--stark-white);
}

/* =====================================================
   PROJECTS SECTION
   ===================================================== */
.projects {
    padding: var(--section-padding) 0;
    border-bottom: var(--border-thick);
}

.section-header {
    padding: 0 80px 50px;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.04em;
}

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

.project-card {
    border-right: var(--border-thick);
    border-bottom: var(--border-thick);
    background-color: var(--stark-white);
    transition: all var(--transition-fast);
}

.project-card:nth-child(2n) {
    border-right: none;
}

.project-card:hover {
    background-color: var(--jet-black);
}

.project-card:hover .project-title,
.project-card:hover .project-description,
.project-card:hover .project-details li {
    color: var(--stark-white);
}

.project-card:hover .tech-tag {
    border-color: var(--industrial-orange);
    color: var(--industrial-orange);
}

.project-card:hover .project-badge {
    background-color: var(--industrial-orange);
    color: var(--stark-white);
}

.project-image {
    aspect-ratio: 4/3;
    overflow: hidden;
    border-bottom: var(--border-medium);
}

.project-image svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.project-card:hover .project-image svg {
    transform: scale(1.03);
}

.project-info {
    padding: 30px;
}

.project-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    padding: 6px 12px;
    background-color: var(--jet-black);
    color: var(--stark-white);
    margin-bottom: 15px;
}

.project-title {
    font-size: 1.4rem;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    transition: color var(--transition-fast);
}

.project-description {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: #666;
    margin-bottom: 20px;
    transition: color var(--transition-fast);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    padding: 6px 12px;
    border: 1px solid var(--jet-black);
    letter-spacing: 0.05em;
    transition: all var(--transition-fast);
}

.project-details {
    list-style: none;
}

.project-details li {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
    color: #444;
    transition: color var(--transition-fast);
}

.project-details li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--industrial-orange);
}

/* =====================================================
   CREDENTIALS SECTION
   ===================================================== */
.credentials {
    padding: var(--section-padding) 0;
    border-bottom: var(--border-thick);
}

.credentials-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
}

.credential-main {
    padding: 50px;
    border-right: var(--border-thick);
}

.credential-main:last-child {
    border-right: none;
}

.credential-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: var(--border-medium);
}

.credential-type {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
}

.credential-period {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

.credential-title {
    font-size: 1.8rem;
    letter-spacing: -0.02em;
    margin-bottom: 5px;
}

.credential-subtitle {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 20px;
}

.credential-detail {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-bottom: 5px;
}

.credential-gpa {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 15px;
    color: var(--industrial-orange);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.cert-item {
    display: flex;
    gap: 15px;
    padding: 20px;
    border: var(--border-medium);
    transition: all var(--transition-fast);
}

.cert-item:hover {
    background-color: var(--industrial-orange);
    border-color: var(--industrial-orange);
}

.cert-item:hover .cert-title,
.cert-item:hover .cert-issuer {
    color: var(--stark-white);
}

.cert-icon {
    font-size: 1.5rem;
    color: var(--industrial-orange);
    flex-shrink: 0;
}

.cert-item:hover .cert-icon {
    color: var(--stark-white);
}

.cert-title {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 5px;
    transition: color var(--transition-fast);
}

.cert-issuer {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: #666;
    transition: color var(--transition-fast);
}

/* =====================================================
   CONTACT SECTION
   ===================================================== */
.contact {
    padding: var(--section-padding) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
}

.contact-info {
    padding: 60px;
    border-right: var(--border-thick);
}

.contact-intro {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 900;
    line-height: 1.4;
    margin-bottom: 50px;
    letter-spacing: -0.02em;
}

.contact-block {
    margin-bottom: 40px;
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
    margin-bottom: 10px;
}

.contact-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    margin-bottom: 5px;
}

.contact-value a {
    transition: color var(--transition-fast);
}

.contact-value a:hover {
    color: var(--industrial-orange);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 40px;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    border: var(--border-medium);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--jet-black);
}

.social-link:hover .social-icon,
.social-link:hover .social-text {
    color: var(--stark-white);
}

.social-icon {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 900;
    color: var(--industrial-orange);
}

.social-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
}

.contact-form-wrapper {
    padding: 60px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.15em;
}

.form-input {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 15px 0;
    background: transparent;
    border: none;
    border-bottom: var(--border-medium);
    color: var(--jet-black);
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-input:focus {
    border-color: var(--industrial-orange);
}

.form-textarea {
    resize: none;
    min-height: 100px;
}

.form-submit {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 18px 35px;
    background-color: var(--jet-black);
    color: var(--stark-white);
    border: none;
    cursor: pointer;
    align-self: flex-start;
    transition: background-color var(--transition-fast);
}

.form-submit:hover {
    background-color: var(--industrial-orange);
}

/* =====================================================
   FOOTER
   ===================================================== */
.footer {
    background-color: var(--jet-black);
    padding: 60px 0 30px;
}

.footer-grid {
    max-width: 1920px;
    margin: 0 auto;
    padding: 0 60px;
}

.footer-brand {
    padding-bottom: 30px;
    border-bottom: 1px solid #333;
    margin-bottom: 30px;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    color: var(--stark-white);
}

.footer-tagline {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--industrial-orange);
    margin-top: 5px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid #333;
}

.footer-column h5 {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--industrial-orange);
    margin-bottom: 15px;
}

.footer-column a {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #888;
    margin-bottom: 8px;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--stark-white);
}

.footer-bottom {
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: #555;
}

/* =====================================================
   RESPONSIVE DESIGN
   ===================================================== */
@media (max-width: 1200px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skill-category:nth-child(2) {
        border-right: none;
    }
    
    .skill-category:nth-child(3) {
        grid-column: span 2;
        border-right: none;
        border-top: var(--border-thick);
    }
    
    .cert-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-content {
        border-right: none;
        border-bottom: var(--border-thick);
        min-height: auto;
    }
    
    .hero-image-wrapper {
        min-height: 50vh;
    }
    
    .credentials-grid {
        grid-template-columns: 1fr;
    }
    
    .credential-main {
        border-right: none;
        border-bottom: var(--border-thick);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        border-right: none;
        border-bottom: var(--border-thick);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    .header-container {
        padding: 0 20px;
    }
    
    .header-right {
        display: none;
    }
    
    .nav {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .hero-content {
        padding: 40px;
    }
    
    .hero-meta {
        flex-wrap: wrap;
        gap: 25px;
    }
    
    .section-header {
        padding: 0 40px 40px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .skill-category {
        border-right: none;
        border-bottom: var(--border-thick);
    }
    
    .skill-category:nth-child(3) {
        border-top: none;
        border-bottom: none;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card {
        border-right: none;
    }
    
    .contact-info {
        padding: 40px;
    }
    
    .contact-form-wrapper {
        padding: 40px;
    }
    
    .footer-grid {
        padding: 0 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .cursor {
        display: none;
    }
    
    body {
        cursor: auto;
    }
}

@media (max-width: 480px) {
    .hero-content {
        padding: 30px;
    }
    
    .hero-meta {
        flex-direction: column;
        gap: 15px;
    }
    
    .social-links {
        flex-direction: column;
    }
}

/* =====================================================
   ANIMATIONS
   ===================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Hide scrollbar but keep functionality */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--concrete-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--jet-black);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--industrial-orange);
}

/* Selection color */
::selection {
    background-color: var(--industrial-orange);
    color: var(--stark-white);
}