/* =========================================
   DESIGN SYSTEM — Dark Forest Theme
   ========================================= */

:root {
    --bg-dark: #040d07;
    --bg-surface: #071a0e;
    --bg-card: rgba(10, 35, 18, 0.4);
    --bg-card-hover: rgba(16, 50, 28, 0.6);

    --accent-primary: #00e676;
    --accent-primary-rgb: 0, 230, 118;
    --accent-secondary: #4fd1c5;
    --accent-secondary-rgb: 79, 209, 197;

    --text-primary: #e8f5e9;
    --text-secondary: rgba(232, 245, 233, 0.72);
    --text-muted: rgba(232, 245, 233, 0.52);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --glass-bg: rgba(8, 24, 12, 0.55);
    --glass-border: rgba(0, 230, 118, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);

    --container-width: 1200px;
    --nav-height: 72px;
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* =========================================
   RESET & BASE
   ========================================= */

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

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 800;
    line-height: 1.2;
}

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

ul { list-style: none; }
img { max-width: 100%; display: block; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* =========================================
   SKIP LINK (Accessibility)
   ========================================= */

.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-primary);
    color: #000;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 8px 8px;
    font-weight: 600;
    z-index: 10000;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* =========================================
   BACKGROUND — Mesh + Grid Pattern
   ========================================= */

.mesh-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    background: var(--bg-dark);
}

.mesh-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(var(--accent-primary-rgb), 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.025) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 20%, transparent 70%);
}

.blob {
    position: absolute;
    filter: blur(130px);
    opacity: 0.4;
    animation: drift 25s infinite alternate ease-in-out;
    border-radius: 50%;
}

.blob-1 {
    top: -15%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.3) 0%, transparent 70%);
}

.blob-2 {
    bottom: -20%;
    right: -10%;
    width: 55vw;
    height: 55vw;
    background: radial-gradient(circle, rgba(var(--accent-secondary-rgb), 0.22) 0%, transparent 70%);
    animation-delay: -7s;
}

.blob-3 {
    top: 40%;
    left: 30%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(0, 100, 60, 0.2) 0%, transparent 70%);
    animation-delay: -14s;
}

@keyframes drift {
    0%   { transform: translate(0, 0) scale(1) rotate(0deg); }
    100% { transform: translate(8%, 12%) scale(1.12) rotate(4deg); }
}

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

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-accent { color: var(--accent-primary); }
.text-accent-secondary { color: var(--accent-secondary); }

/* =========================================
   GLASS COMPONENT
   ========================================= */

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
}

/* =========================================
   BUTTONS
   ========================================= */

.btn-primary,
.btn-secondary,
.btn-primary-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #00c853);
    color: #000;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(var(--accent-primary-rgb), 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(var(--accent-primary-rgb), 0.45);
}

.btn-secondary {
    background: rgba(var(--accent-primary-rgb), 0.05);
    color: var(--text-primary);
    padding: 0.875rem 2rem;
    font-size: 1rem;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.15);
}

.btn-secondary:hover {
    background: rgba(var(--accent-primary-rgb), 0.1);
    border-color: rgba(var(--accent-primary-rgb), 0.3);
    transform: translateY(-2px);
}

.btn-primary-sm {
    background: var(--accent-primary);
    color: #000;
    padding: 0.5rem 1.25rem;
    font-size: 0.85rem;
}

.btn-primary-sm:hover {
    background: #00ff88;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(var(--accent-primary-rgb), 0.35);
}

/* =========================================
   NAVIGATION
   ========================================= */

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    height: var(--nav-height);
    z-index: 1000;
    transition: background 0.35s, box-shadow 0.35s;
}

.navbar.scrolled {
    background: rgba(4, 13, 7, 0.88);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--glass-border), 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
    z-index: 1001;
}

.nav-logo { display: flex; align-items: center; }
.nav-logo svg { display: block; }

.logo-img {
    display: block;
    transition: var(--transition-fast);
}

.nav-brand:hover .logo-img {
    filter: brightness(1.15);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a:not(.btn-primary-sm) {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.25rem 0;
}

.nav-links a:not(.btn-primary-sm)::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 1px;
    transition: width 0.3s ease;
}

.nav-links a:not(.btn-primary-sm):hover,
.nav-links a:not(.btn-primary-sm).active {
    color: var(--accent-primary);
}

.nav-links a:not(.btn-primary-sm):hover::after,
.nav-links a:not(.btn-primary-sm).active::after {
    width: 100%;
}

.hamburger {
    display: none;
    font-size: 1.3rem;
    cursor: pointer;
    z-index: 1001;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    transition: var(--transition-fast);
    background: none;
    border: none;
    color: var(--text-primary);
}

.hamburger:hover {
    background: rgba(var(--accent-primary-rgb), 0.1);
}

/* Mobile Overlay */
.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* =========================================
   HERO
   ========================================= */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    padding-top: var(--nav-height);
}

.hero-content {
    max-width: 800px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.glass-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(var(--accent-primary-rgb), 0.06);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.15);
    border-radius: 30px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 2rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%  { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--accent-primary-rgb), 0.6); }
    70% { transform: scale(1);    box-shadow: 0 0 0 10px rgba(var(--accent-primary-rgb), 0); }
    100%{ transform: scale(0.95); box-shadow: 0 0 0 0 rgba(var(--accent-primary-rgb), 0); }
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 4.2rem);
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.typing-cursor {
    display: inline-block;
    width: 3px;
    height: 0.9em;
    background: var(--accent-primary);
    animation: blink 1s step-end infinite;
    margin-left: 2px;
    vertical-align: text-bottom;
    border-radius: 1px;
}

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

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.hero-subtitle strong {
    color: var(--text-primary);
}

.hero-intro {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tech-stack-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.tech-item {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 6px 14px;
    background: rgba(var(--accent-primary-rgb), 0.04);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.08);
    border-radius: 20px;
    transition: var(--transition-fast);
}

.tech-item:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.2);
    color: var(--text-secondary);
}

.tech-item i {
    font-size: 1rem;
    color: var(--accent-primary);
}

/* =========================================
   COMMON SECTION STYLES
   ========================================= */

.section-padding {
    padding: 100px 5%;
}

.section-header {
    margin-bottom: 3rem;
    text-align: center;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    margin-bottom: 0.75rem;
}

.section-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    margin: 0 auto;
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-secondary);
    margin-top: 1rem;
    max-width: 620px;
    margin-inline: auto;
    font-size: 1rem;
}

/* =========================================
   ABOUT / EXPERIENCE CONTENT
   ========================================= */

.about-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 2.5rem;
    border-radius: 20px;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.about-text strong {
    color: var(--text-primary);
}

.exp-block {
    margin-bottom: 2rem;
}

.exp-block:last-child {
    margin-bottom: 0;
}

.exp-block-title {
    margin-bottom: 0.5rem;
    font-size: 1.15rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* =========================================
   TIMELINE (Portrait / Vertical)
   ========================================= */

.timeline-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.research-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.65;
}

.project-metric {
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.media-links {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.media-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.media-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.cert-card {
    display: block;
    padding: 1.5rem;
    border-radius: 16px;
    transition: var(--transition-smooth);
    text-decoration: none;
    color: inherit;
}

.cert-card:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--accent-primary-rgb), 0.2);
}

.cert-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

.cert-issuer {
    font-size: 0.9rem;
    color: var(--accent-secondary);
    margin-bottom: 0.2rem;
}

.cert-year {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

.contact-cta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 0;
}

.contact-cta-card {
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition-smooth);
}

.contact-cta-card:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.2);
}

.contact-cta-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
    color: var(--accent-primary);
}

.contact-cta-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.timeline {
    position: relative;
    max-width: 560px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
    opacity: 0.4;
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-left: 48px;
    padding-bottom: 2rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(var(--accent-primary-rgb), 0.15);
}

.timeline-content {
    padding: 1rem 1.25rem;
    background: rgba(var(--accent-primary-rgb), 0.03);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.08);
    border-radius: 12px;
    transition: var(--transition-fast);
}

.timeline-content:hover {
    border-color: rgba(var(--accent-primary-rgb), 0.2);
    background: rgba(var(--accent-primary-rgb), 0.05);
}

.timeline-date {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.timeline-country {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 8px;
    background: rgba(var(--accent-primary-rgb), 0.1);
    border-radius: 4px;
    color: var(--accent-secondary);
    margin-left: 0.5rem;
    font-weight: 500;
}

.timeline-content h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.timeline-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem 1rem;
    background: rgba(var(--accent-primary-rgb), 0.03);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.06);
    border-radius: 14px;
    transition: var(--transition-smooth);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--accent-primary-rgb), 0.15);
    background: rgba(var(--accent-primary-rgb), 0.06);
}

.stat-card h3 {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
}

.stat-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0;
}

/* =========================================
   PROJECTS / CARDS GRID
   ========================================= */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: var(--container-width);
    margin: 0 auto;
}

.project-card {
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(var(--accent-primary-rgb), 0.2);
}

.project-image {
    height: 180px;
    background: linear-gradient(135deg, rgba(10, 30, 18, 0.8), rgba(20, 50, 30, 0.6));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.project-image i {
    color: var(--text-muted);
    transition: var(--transition-smooth);
}

.project-card:hover .project-image i {
    transform: scale(1.15);
    color: var(--accent-primary);
}

.project-info {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.project-info > p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 1rem;
    flex-grow: 1;
    line-height: 1.65;
}

.project-info > p + .project-tags {
    margin-top: 0;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-tags span {
    font-size: 0.75rem;
    padding: 4px 12px;
    background: rgba(var(--accent-primary-rgb), 0.06);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.1);
    border-radius: 20px;
    color: var(--accent-primary);
}

.project-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.github-link {
    font-size: 1.4rem;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.github-link:hover {
    color: var(--accent-primary);
    transform: scale(1.15);
}

/* =========================================
   INDUSTRIES
   ========================================= */

.industries {
    background: linear-gradient(to bottom, transparent, rgba(var(--accent-primary-rgb), 0.015), transparent);
}

.industry-card {
    text-align: center;
    padding: 2.5rem 1.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.industry-icon {
    width: 72px;
    height: 72px;
    background: rgba(var(--accent-primary-rgb), 0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.5rem;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.1);
    transition: var(--transition-smooth);
}

.project-card:hover .industry-icon {
    background: rgba(var(--accent-primary-rgb), 0.1);
    box-shadow: 0 0 25px rgba(var(--accent-primary-rgb), 0.08);
}

.industry-card h3 {
    font-size: 1.3rem;
}

.industry-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

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

.skills-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem;
    border-radius: 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
}

.skill-category h3 {
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--accent-secondary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.skill-tags span {
    font-size: 0.85rem;
    padding: 8px 14px;
    background: rgba(var(--accent-primary-rgb), 0.04);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.08);
    border-radius: 8px;
    transition: var(--transition-fast);
    color: var(--text-secondary);
}

.skill-tags span:hover {
    background: rgba(var(--accent-primary-rgb), 0.1);
    border-color: rgba(var(--accent-primary-rgb), 0.25);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

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

.contact-box {
    max-width: 800px;
    margin: 0 auto;
    padding: 3.5rem 2rem;
    border-radius: 20px;
    text-align: center;
}

.contact-box p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-links-title {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 2rem;
    margin-bottom: 1rem;
    text-align: center;
    font-weight: 600;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--accent-primary-rgb), 0.06);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.12);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: rgba(var(--accent-primary-rgb), 0.12);
    border-color: rgba(var(--accent-primary-rgb), 0.25);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* =========================================
   RESEARCH WORK
   ========================================= */

.research-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.research-card {
    display: flex;
    gap: 1.75rem;
    padding: 2rem;
    border-radius: 16px;
    transition: var(--transition-smooth);
    align-items: flex-start;
}

.research-card:hover {
    transform: translateX(6px);
    border-color: rgba(var(--accent-primary-rgb), 0.2);
    box-shadow: -4px 0 20px rgba(var(--accent-primary-rgb), 0.06);
}

.research-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    background: rgba(var(--accent-primary-rgb), 0.06);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--accent-primary);
    transition: var(--transition-smooth);
}

.research-card:hover .research-icon {
    background: rgba(var(--accent-primary-rgb), 0.12);
    box-shadow: 0 0 15px rgba(var(--accent-primary-rgb), 0.08);
}

.research-body {
    flex: 1;
    min-width: 0;
}

.research-type {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-secondary);
    margin-bottom: 0.4rem;
    padding: 3px 10px;
    background: rgba(var(--accent-secondary-rgb), 0.08);
    border-radius: 4px;
}

.research-body h3 {
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
    line-height: 1.35;
}

.research-body p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 1rem;
}

.research-body .project-tags {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .research-card {
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem;
    }
}

/* =========================================
   BLOG "COMING SOON" BADGE
   ========================================= */

.badge-coming-soon {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    margin-bottom: 0.5rem;
    display: inline-block;
}

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

.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--glass-border);
    background: rgba(4, 13, 7, 0.8);
}

.footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* =========================================
   ANIMATIONS
   ========================================= */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
    will-change: opacity, transform;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.tilt-card {
    transform-style: preserve-3d;
    transform: perspective(1000px);
}

/* =========================================
   RESPONSIVE — Tablet
   ========================================= */

@media (max-width: 1024px) {
    .section-padding { padding: 80px 5%; }
    .about-content { padding: 2rem; }
    .skills-container {
        padding: 2rem;
        grid-template-columns: repeat(2, 1fr);
    }
}

/* =========================================
   RESPONSIVE — Mobile
   ========================================= */

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: min(300px, 80vw);
        height: 100vh;
        height: 100dvh;
        flex-direction: column;
        background: var(--bg-surface);
        padding: calc(var(--nav-height) + 2rem) 2rem 2rem;
        gap: 0.25rem;
        transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        border-left: 1px solid var(--glass-border);
        overflow-y: auto;
        z-index: 999;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a:not(.btn-primary-sm) {
        font-size: 1.05rem;
        padding: 0.75rem 0;
        display: block;
        width: 100%;
        border-bottom: 1px solid rgba(var(--accent-primary-rgb), 0.05);
    }

    .nav-links a:not(.btn-primary-sm)::after {
        display: none;
    }

    .nav-links li:last-child {
        margin-top: 1rem;
    }

    .nav-links .btn-primary-sm {
        width: 100%;
        padding: 0.75rem;
        text-align: center;
    }

    .hero {
        min-height: calc(100vh - var(--nav-height));
        min-height: calc(100dvh - var(--nav-height));
        padding-top: calc(var(--nav-height) + 2rem);
    }

    .hero-title {
        font-size: clamp(1.75rem, 7vw, 2.8rem);
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 320px;
    }

    .hero-cta a {
        width: 100%;
        justify-content: center;
    }

    .glass-badge {
        font-size: 0.75rem;
        padding: 6px 12px;
    }

    .section-padding {
        padding: 60px 5%;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .about-content {
        padding: 1.5rem;
        border-radius: 16px;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }

    .stat-card {
        padding: 1rem 0.5rem;
    }

    .stat-card h3 {
        font-size: 1.4rem;
    }

    .stat-card p {
        font-size: 0.75rem;
    }

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

    .skills-container {
        padding: 1.5rem;
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-box {
        padding: 2.5rem 1.5rem;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    .contact-links .btn-secondary {
        width: 100%;
        max-width: 300px;
    }

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

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

    .tech-stack-row {
        gap: 0.6rem;
    }

    .tech-item {
        font-size: 0.78rem;
        padding: 4px 10px;
    }

    .exp-block-title {
        font-size: 1.05rem;
    }

    .timeline-item {
        padding-left: 40px;
    }

    .timeline-marker {
        width: 20px;
        height: 20px;
        top: 6px;
    }

    .timeline::before {
        left: 9px;
    }

    .timeline-content {
        padding: 0.875rem 1rem;
    }

    .timeline-content h3 {
        font-size: 1rem;
    }
}

/* =========================================
   RESPONSIVE — Small Phones
   ========================================= */

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 0.88rem;
    }

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

    .section-title {
        font-size: 1.5rem;
    }

    .about-content {
        padding: 1.25rem;
    }

    .project-info {
        padding: 1.25rem;
    }

    .industry-card {
        padding: 2rem 1.25rem;
    }
}