/* =========================================
   DESIGN TOKENS
========================================= */

:root {
    /* Colors */
    --bg-primary: #0b1120;
    --bg-secondary: #080d18;
    --surface: #111827;
    --surface-tag: #172033;
    --border: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #e5e7eb;
    --text-dim: #cbd5e1;
    --text-muted: #94a3b8;

    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --accent-contrast: #07111f;
    --accent-soft: rgba(56, 189, 248, 0.08);
    --accent-border: rgba(56, 189, 248, 0.35);
    --grad-accent: linear-gradient(135deg, #38bdf8, #0ea5e9);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-pill: 999px;

    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(2, 6, 23, 0.4);
    --shadow-md: 0 14px 34px rgba(2, 6, 23, 0.5);
    --shadow-lg: 0 24px 60px rgba(2, 6, 23, 0.65);
    --shadow-accent: 0 10px 26px rgba(56, 189, 248, 0.25);

    /* Layout */
    --container-max: 1200px;
    --section-padding: 100px;
    --section-padding-mobile: 80px;

    /* Motion */
    --transition: 0.3s ease;
    --transition-fast: 0.2s ease;
}


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

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

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

img {
    max-width: 100%;
}

section {
    padding: var(--section-padding) 8%;
    scroll-margin-top: 80px;
}

::selection {
    background: rgba(56, 189, 248, 0.3);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .hero-video {
        display: none;
    }
}


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

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(11, 17, 32, 0.85);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(2, 6, 23, 0.35);
}

nav {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 20px 30px;

    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    position: relative;
    padding: 4px 0;

    color: var(--text-dim);
    font-size: 0.95rem;
    font-weight: 500;

    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 2px;
    background: var(--accent);
    border-radius: var(--radius-pill);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a:hover::after {
    transform: scaleX(1);
}

/* Hamburger toggle - desktop hidden, shown on small screens */

.nav-toggle {
    display: none;
}


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

.hero {
    position: relative;
    min-height: 100vh;
    overflow: hidden;

    display: flex;
    align-items: center;
    justify-content: center;

    text-align: center;

    background:
        radial-gradient(1200px 600px at 15% 10%, rgba(56, 189, 248, 0.12), transparent 55%),
        radial-gradient(1000px 500px at 85% 85%, rgba(14, 165, 233, 0.1), transparent 55%),
        var(--bg-primary);
}

.hero-video {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.hero-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background:
        radial-gradient(1100px 640px at 50% 42%, rgba(8, 12, 24, 0.82), transparent 72%),
        linear-gradient(180deg, rgba(11, 17, 32, 0.55), rgba(11, 17, 32, 0.7));
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
    background-size: 52px 52px;
    -webkit-mask-image: radial-gradient(ellipse at center, #000 25%, transparent 72%);
    mask-image: radial-gradient(ellipse at center, #000 25%, transparent 72%);
}

.hero::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 140px;
    z-index: 2;
    background: linear-gradient(to bottom, transparent, var(--bg-primary));
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 900px;
    padding: 120px 16px 40px;
}

.hero-scroll {
    position: absolute;
    bottom: 26px;
    left: 50%;
    width: 26px;
    height: 42px;
    margin-left: -13px;
    z-index: 3;
    border: 2px solid rgba(148, 163, 184, 0.45);
    border-radius: 999px;
    pointer-events: none;
}

.hero-scroll::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 50%;
    width: 4px;
    height: 8px;
    margin-left: -2px;
    border-radius: 2px;
    background: var(--accent);
    animation: hero-scroll-pulse 2.2s ease-in-out infinite;
}

@keyframes hero-scroll-pulse {
    0%   { transform: translateY(0); opacity: 1; }
    50%  { transform: translateY(10px); opacity: 0.3; }
    100% { transform: translateY(0); opacity: 1; }
}

.intro {
    display: inline-block;
    padding: 8px 18px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--accent-border);
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    margin-bottom: 22px;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    box-shadow: 0 2px 12px rgba(56, 189, 248, 0.12);
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 1.02;
    letter-spacing: -0.03em;
    margin-bottom: 22px;
    color: var(--text-primary);
    font-weight: 800;
    text-shadow: 0 2px 24px rgba(2, 6, 23, 0.45);
}

.hero h2 {
    font-size: clamp(1.2rem, 2.4vw, 1.5rem);
    font-weight: 600;
    letter-spacing: 0.4px;
    margin-bottom: 28px;
    background-image: linear-gradient(90deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
    .hero h2 {
        color: var(--accent);
    }
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 680px;
    margin: 0 auto 32px;
    text-shadow: 0 1px 12px rgba(2, 6, 23, 0.4);
}

.hero-tools {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.hero-tools span {
    padding: 7px 16px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: rgba(11, 17, 32, 0.55);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    color: var(--text-dim);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.3px;
    transition:
        border-color var(--transition),
        color var(--transition),
        transform var(--transition);
}

.hero-tools span:hover {
    border-color: var(--accent-border);
    color: var(--accent);
    transform: translateY(-2px);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}


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

.hero-buttons a,
.back-projects a {
    display: inline-block;
    padding: 13px 28px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--accent);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.hero-buttons a:first-child {
    background: var(--grad-accent);
    border-color: transparent;
    color: var(--accent-contrast);
    box-shadow: 0 4px 18px rgba(56, 189, 248, 0.25);
}

.hero-buttons a:last-child {
    background: var(--accent-soft);
    border-color: var(--accent-border);
    color: var(--text-dim);
}

.hero-buttons a:hover,
.back-projects a:hover {
    transform: translateY(-3px);
}

.hero-buttons a:first-child:hover {
    box-shadow: 0 8px 28px rgba(56, 189, 248, 0.45);
}

.hero-buttons a:last-child:hover,
.back-projects a:hover {
    background: var(--grad-accent);
    border-color: transparent;
    color: var(--accent-contrast);
    box-shadow: var(--shadow-accent);
}

.back-projects a {
    color: var(--accent);
}


/* Hero CTA polish (scoped to hero only — .back-projects untouched) */

.hero-buttons a {
    padding: 15px 34px;
    font-size: 1rem;
    letter-spacing: 0.3px;
}

.hero-buttons a:first-child {
    box-shadow:
        0 4px 18px rgba(56, 189, 248, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.hero-buttons a:last-child {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(56, 189, 248, 0.45);
    color: var(--text-secondary);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.hero-buttons a:first-child:hover {
    box-shadow:
        0 10px 30px rgba(56, 189, 248, 0.45),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.hero-buttons a:last-child:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.hero-buttons a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}


/* =========================================
   SECTION HEADINGS
========================================= */

section h2 {
    text-align: center;
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    letter-spacing: -0.01em;
    margin-bottom: 50px;
    color: var(--text-primary);
}

.section-header {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 50px;
}

.section-header h2 {
    margin-bottom: 16px;
}

.section-label {
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-description {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.7;
}


/* =========================================
   ABOUT / PROFESSIONAL PROFILE
========================================= */

#about {
    background:
        radial-gradient(900px 400px at 85% 15%, rgba(56, 189, 248, 0.07), transparent 55%),
        linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.about-grid {
    max-width: var(--container-max);
    margin: 0 auto;

    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
    align-items: center;
}

/* Left: heading & introduction */

.about-intro .section-label {
    margin-bottom: 16px;
}

.about-intro h2 {
    text-align: left;
    margin-bottom: 24px;
}

.about-intro h2::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    margin-top: 18px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
}

.about-intro > p {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 18px;
}

.about-intro > p:last-child {
    margin-bottom: 0;
}

/* Right: professional profile card */

.about-profile {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 34px 32px;
    box-shadow: var(--shadow-md);

    transition:
        border-color var(--transition),
        box-shadow var(--transition);
}

.about-profile:hover {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-lg);
}

.about-profile h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.about-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-border);
    display: block;
    margin: 0 auto 20px;
    box-shadow: var(--shadow-md);
    background: var(--surface-tag);
}

.profile-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.profile-list li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.profile-icon {
    flex-shrink: 0;

    width: 40px;
    height: 40px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: var(--radius-md);
    border: 1px solid var(--accent-border);
    background: var(--accent-soft);

    color: var(--accent);
}

.profile-icon svg {
    width: 18px;
    height: 18px;
    display: block;
}

.profile-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 3px;
}

.profile-label {
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1.6px;
    text-transform: uppercase;
}

.profile-value {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
}


/* =========================================
   SKILLS / TECHNICAL CAPABILITIES
========================================= */

.skills-grid {
    max-width: var(--container-max);
    margin: 0 auto;

    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.skill-card {
    display: flex;
    flex-direction: column;

    padding: 30px 28px;

    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);

    transition:
        transform var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-border);
    box-shadow: var(--shadow-md);
}

/* Core tools (Power BI, Excel, SQL) receive stronger emphasis */

.skill-card-core {
    background: linear-gradient(180deg, rgba(56, 189, 248, 0.07), transparent 45%), var(--surface);
    border-color: rgba(56, 189, 248, 0.28);
}

.skill-card-core:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-accent);
}

.skill-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 22px;
}

.skill-icon {
    flex-shrink: 0;

    width: 44px;
    height: 44px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-primary);

    color: var(--accent);
}

.skill-card-core .skill-icon {
    border-color: var(--accent-border);
    background: var(--accent-soft);
}

.skills-grid .skill-icon svg {
    width: 20px;
    height: 20px;
    max-width: 20px;
    max-height: 20px;
    display: block;
}

.skill-badge {
    white-space: nowrap;

    padding: 5px 11px;

    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.02);

    color: var(--text-muted);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.skill-card-core .skill-badge {
    border-color: var(--accent-border);
    background: var(--accent-soft);
    color: var(--accent);
}

.skill-card h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.skill-category {
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.skill-desc {
    margin-top: auto;

    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}


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

#projects {
    background:
        radial-gradient(900px 400px at 85% 0%, rgba(56, 189, 248, 0.07), transparent 55%),
        linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.projects-container {
    max-width: var(--container-max);
    margin: 0 auto;

    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

/* --- Project Card --- */

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;

    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);

    transition:
        transform var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent-border);
    box-shadow:
        0 16px 40px rgba(2, 6, 23, 0.6),
        0 0 0 1px rgba(56, 189, 248, 0.12),
        var(--shadow-accent);
}

.project-card:focus-within {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-md);
}

/* --- Image --- */

.project-image {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-image-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    background: rgba(11, 17, 32, 0.75);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(56, 189, 248, 0.25);
    color: var(--accent);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    pointer-events: none;
}

/* --- Content --- */

.project-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px 26px 28px;
}

.project-meta {
    margin-bottom: 14px;
}

.project-category {
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1.4px;
    text-transform: uppercase;
}

.project-card h3 {
    color: var(--text-primary);
    font-size: 1.18rem;
    letter-spacing: -0.01em;
    line-height: 1.35;
    margin-bottom: 10px;
}

.project-context {
    color: var(--text-dim);
    font-size: 0.88rem;
    font-weight: 500;
    line-height: 1.55;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.project-desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 18px;
}

.project-notice {
    font-size: 0.82rem;
    color: var(--text-dim);
    border-left: 3px solid var(--accent);
    padding-left: 12px;
}

.project-tags {
    margin-bottom: 22px;
}

.project-tags span {
    display: inline-block;

    padding: 5px 12px;
    margin: 4px 6px 4px 0;

    border-radius: var(--radius-pill);
    border: 1px solid var(--border);

    background: var(--surface-tag);
    color: var(--accent);

    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

/* --- CTA Link --- */

.project-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: auto;
    align-self: flex-start;

    padding: 11px 22px;
    border-radius: var(--radius-pill);
    background: var(--grad-accent);
    border: 1px solid transparent;
    box-shadow: 0 4px 16px rgba(56, 189, 248, 0.25);

    color: var(--accent-contrast);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-decoration: none;

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.project-link svg {
    flex-shrink: 0;
    width: 15px;
    height: 15px;
    transition: transform var(--transition);
}

.project-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(56, 189, 248, 0.45);
}

.project-link:hover svg {
    transform: translateX(3px);
}

.project-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}


/* =========================================
   EDUCATION & PROFESSIONAL DEVELOPMENT
========================================= */

.education-section {
    background:
        radial-gradient(900px 400px at 15% 100%, rgba(56, 189, 248, 0.06), transparent 55%),
        linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.education-groups {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 48px;
}

/* --- Group Header --- */

.education-group-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.education-group-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: 1px solid var(--accent-border);
    background: var(--accent-soft);
    color: var(--accent);
}

.education-group-icon svg {
    width: 17px;
    height: 17px;
    display: block;
}

.education-group-header h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

/* --- Timeline --- */

.education-timeline {
    position: relative;
    padding-left: 28px;
}

.education-timeline::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    border-radius: 2px;
    background: linear-gradient(to bottom, var(--accent-border), rgba(56, 189, 248, 0.08) 80%, transparent);
}

/* --- Card --- */

.education-card {
    position: relative;
    margin-bottom: 20px;
}

.education-card:last-child {
    margin-bottom: 0;
}

.education-card-marker {
    position: absolute;
    left: -28px;
    top: 26px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
    z-index: 1;
    transition:
        background-color var(--transition),
        box-shadow var(--transition);
}

.education-card:hover .education-card-marker {
    background: var(--accent);
    box-shadow:
        0 0 0 3px rgba(56, 189, 248, 0.2),
        0 0 12px rgba(56, 189, 248, 0.4);
}

.education-card-body {
    padding: 24px 26px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition:
        border-color var(--transition),
        box-shadow var(--transition);
}

.education-card:hover .education-card-body {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-sm);
}

/* --- Badge --- */

.education-badge {
    display: inline-block;
    padding: 4px 11px;
    margin-bottom: 12px;
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-pill);
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* --- Title & Institution --- */

.education-card h4 {
    color: var(--text-primary);
    font-size: 1.12rem;
    letter-spacing: -0.01em;
    line-height: 1.4;
    margin-bottom: 4px;
}

.education-institution {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.education-desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 14px;
}

.education-desc:last-child {
    margin-bottom: 0;
}

/* --- Tags --- */

.education-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.education-tags span {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: var(--surface-tag);
    color: var(--text-dim);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.2px;
}


/* =========================================
   CERTIFICATIONS
========================================= */

.certifications-section {
    background:
        radial-gradient(900px 400px at 85% 0%, rgba(56, 189, 248, 0.06), transparent 55%),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.certifications-grid {
    max-width: 720px;
    margin: 0 auto;
    display: grid;
    gap: 28px;
}

/* --- Card --- */

.certification-card {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 36px;
    align-items: start;
    padding: 32px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition:
        border-color var(--transition),
        box-shadow var(--transition);
}

.certification-card:hover {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-sm);
}

/* --- Image --- */

.certification-image-link {
    display: block;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    border: none;
    padding: 0;
    background: none;
    width: 100%;
}

.certification-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
    transition: transform var(--transition);
}

.certification-image-link:hover .certification-image {
    transform: scale(1.03);
}

.certification-image-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(11, 17, 32, 0.75);
    backdrop-filter: blur(4px);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    opacity: 0;
    transition: opacity var(--transition);
}

.certification-image-link:hover .certification-image-overlay {
    opacity: 1;
}

/* --- Document Preview --- */

.certification-document-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 220px;
    padding: 28px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background:
        radial-gradient(220px 140px at 50% 0%, rgba(56, 189, 248, 0.12), transparent 70%),
        var(--surface-tag);
    text-align: center;
    transition:
        border-color var(--transition),
        transform var(--transition);
}

.certification-document-link:hover {
    border-color: var(--accent-border);
    transform: translateY(-2px);
}

.certification-document-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.certification-document-icon {
    width: 54px;
    height: 54px;
    color: var(--accent);
    opacity: 0.9;
}

.certification-document-title {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.certification-document-meta {
    color: var(--text-muted);
    font-size: 0.78rem;
    line-height: 1.6;
}

/* --- Details --- */

.certification-details {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.certification-badge {
    display: inline-block;
    padding: 4px 11px;
    margin-bottom: 12px;
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-pill);
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    width: fit-content;
}

.certification-card h4 {
    color: var(--text-primary);
    font-size: 1.2rem;
    letter-spacing: -0.01em;
    line-height: 1.4;
    margin-bottom: 4px;
}

.certification-issuer {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.certification-desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 14px;
}

/* --- Meta --- */

.certification-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 14px;
}

.certification-date {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 500;
}

.certification-date svg {
    flex-shrink: 0;
    color: var(--accent);
    opacity: 0.7;
}

/* --- Tags --- */

.certification-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.certification-tags span {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: var(--surface-tag);
    color: var(--text-dim);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.2px;
}

/* --- Links --- */

.certification-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.certification-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 24px;
    border-radius: var(--radius-pill);
    background: var(--grad-accent);
    border: 1px solid transparent;
    box-shadow: 0 4px 18px rgba(56, 189, 248, 0.28),
                inset 0 1px 0 rgba(255, 255, 255, 0.18);
    color: var(--accent-contrast);
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-decoration: none;
    transition:
        transform var(--transition),
        box-shadow var(--transition);
}

.certification-btn-primary svg {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
}

.certification-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(56, 189, 248, 0.45),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.certification-btn-primary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* --- Lightbox --- */

.cert-lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background: rgba(11, 17, 32, 0.92);
    backdrop-filter: blur(12px);
    opacity: 0;
    visibility: hidden;
    transition:
        opacity 0.3s ease,
        visibility 0.3s ease;
}

.cert-lightbox[hidden] {
    display: flex;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.cert-lightbox.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.cert-lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: rgba(17, 24, 39, 0.8);
    color: var(--text-secondary);
    cursor: pointer;
    transition:
        border-color var(--transition),
        color var(--transition);
}

.cert-lightbox-close:hover {
    border-color: var(--accent-border);
    color: var(--accent);
}

.cert-lightbox-image {
    max-width: 90vw;
    max-height: 85vh;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    object-fit: contain;
}


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

.contact-section {
    background:
        radial-gradient(900px 500px at 15% 100%, rgba(56, 189, 248, 0.06), transparent 55%),
        linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
}

/* --- Two-Column Layout --- */

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    max-width: var(--container-max);
    margin: 0 auto;
    align-items: start;
}

/* --- Left: CTA --- */

.contact-cta {
    padding: 36px 34px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-cta-text {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.75;
}

.contact-cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.contact-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: var(--radius-pill);
    background: var(--grad-accent);
    border: 1px solid transparent;
    box-shadow: 0 4px 18px rgba(56, 189, 248, 0.28),
                inset 0 1px 0 rgba(255, 255, 255, 0.18);

    color: var(--accent-contrast);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-decoration: none;

    transition:
        transform var(--transition),
        box-shadow var(--transition);
}

.contact-btn-primary svg {
    flex-shrink: 0;
    width: 15px;
    height: 15px;
    transition: transform var(--transition);
}

.contact-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(56, 189, 248, 0.45),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.contact-btn-primary:hover svg {
    transform: translateX(3px);
}

.contact-btn-primary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.contact-btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 13px 28px;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(56, 189, 248, 0.45);

    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    text-decoration: none;

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background-color var(--transition),
        color var(--transition),
        border-color var(--transition);
}

.contact-btn-secondary:hover {
    transform: translateY(-2px);
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.contact-btn-secondary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* --- Right: Contact Info Card --- */

.contact-info {
    padding: 36px 34px;
    background: linear-gradient(180deg, rgba(56, 189, 248, 0.04), transparent 60%), var(--surface);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 0;
}

.contact-info-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.contact-info-row:first-child {
    padding-top: 0;
}

.contact-info-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.contact-info-icon {
    flex-shrink: 0;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: 1px solid var(--accent-border);
    background: var(--accent-soft);
    color: var(--accent);
}

.contact-info-icon svg {
    width: 19px;
    height: 19px;
    display: block;
}

.contact-info-text {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}

.contact-info-label {
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
}

.contact-info-value {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
    word-break: break-all;
}

a.contact-info-value:hover {
    color: var(--accent);
}

a.contact-info-value:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

/* --- Availability Banner --- */

.contact-availability {
    max-width: var(--container-max);
    margin: 32px auto 0;
    padding: 32px 40px;
    text-align: center;

    background: linear-gradient(180deg, rgba(56, 189, 248, 0.07), transparent 60%), var(--surface);
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: var(--radius-lg);
}

.contact-availability h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 12px;
}

.contact-availability p {
    margin: 0;
    color: var(--text-dim);
    line-height: 1.7;
}


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

.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 52px 8% 40px;
}

/* --- Brand Column --- */

.footer-logo {
    display: inline-block;
    color: var(--accent);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-decoration: none;
    margin-bottom: 6px;
    transition: color var(--transition-fast);
}

.footer-logo:hover {
    color: var(--accent-hover);
}

.footer-role {
    color: var(--text-dim);
    font-size: 0.88rem;
    font-weight: 500;
    margin-bottom: 14px;
}

.footer-statement {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.65;
    max-width: 320px;
}

/* --- Navigation & Connect Columns --- */

.footer-nav h4,
.footer-connect h4 {
    color: var(--text-primary);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 18px;
}

.footer-nav ul,
.footer-connect ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-nav a,
.footer-connect a {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 400;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-nav a:hover,
.footer-connect a:hover {
    color: var(--accent);
}

.footer-nav a:focus-visible,
.footer-connect a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

/* --- Divider & Bottom Bar --- */

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 20px 8%;
    border-top: 1px solid var(--border);
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.footer-top {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-top svg {
    transition: transform var(--transition);
}

.footer-top:hover {
    color: var(--accent);
}

.footer-top:hover svg {
    transform: translateY(-2px);
}

.footer-top:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}


/* =========================================
   PROJECT CASE STUDY
========================================= */

.project-hero {
    position: relative;
    min-height: 70vh;

    display: flex;
    flex-direction: column;
    justify-content: center;

    max-width: 1000px;
    margin: 0 auto;

    text-align: center;

    background:
        radial-gradient(700px 400px at 50% 20%, rgba(56, 189, 248, 0.08), transparent 60%);
}

.project-hero h1 {
    font-size: clamp(2.4rem, 6vw, 4.5rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin: 20px 0;
    color: var(--text-primary);
}

.project-hero > p:last-child {
    max-width: 800px;
    margin: 0 auto;

    color: var(--text-muted);
    font-size: 1.15rem;
    line-height: 1.7;
}

.project-type {
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.project-hero .project-type {
    margin-bottom: 16px;
}


/* Dashboard image */

.case-study-dashboard img {
    display: block;

    width: 90%;
    max-width: 1200px;

    margin: 0 auto;

    border-radius: var(--radius-lg);

    border: 1px solid var(--border);

    box-shadow:
        0 30px 80px rgba(2, 6, 23, 0.7),
        0 0 0 1px rgba(56, 189, 248, 0.04);
}


/* Case study content */

.case-study {
    max-width: 1100px;
    margin: 0 auto;
}

.case-study-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    margin-bottom: 80px;
}

.case-study h2 {
    text-align: left;
    margin-bottom: 18px;
}

.case-study p {
    color: var(--text-muted);
    line-height: 1.7;
}

.project-details {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    align-self: start;
}

.project-details h3 {
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 18px;
}

.project-details h3 + h3 {
    margin-top: 26px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.project-details p {
    margin-bottom: 8px;
}


/* Sections */

.case-study-section {
    margin-bottom: 70px;
}

.case-study-section h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}


/* Findings */

.findings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.finding {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    padding: 25px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);

    transition:
        transform var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.finding:hover {
    transform: translateY(-3px);
    border-color: var(--accent-border);
    box-shadow: var(--shadow-sm);
}

.finding h3 {
    color: var(--accent);
    font-size: 1rem;
    margin-bottom: 10px;
}

.finding p {
    line-height: 1.7;
}


/* Project metrics */

.project-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 20px 0;
}

.project-metric {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent 45%), var(--surface);
    padding: 22px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.project-metric-value {
    display: block;
    color: var(--accent);
    font-size: clamp(1.35rem, 2.6vw, 1.9rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 6px;
}

.project-metric-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.5;
}


/* Project tables */

.project-table-wrap {
    margin: 20px 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
}

.project-table {
    width: 100%;
    min-width: 440px;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.project-table caption {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 0.82rem;
    font-weight: 600;
    text-align: left;
}

.project-table th,
.project-table td {
    padding: 12px 18px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.project-table thead th {
    background: var(--surface-tag);
    color: var(--accent);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.project-table tbody tr:last-child th,
.project-table tbody tr:last-child td {
    border-bottom: none;
}

.project-table tbody td {
    color: var(--text-muted);
}

.project-table tbody td:first-child {
    color: var(--text-dim);
    font-weight: 500;
}

.project-table--matrix {
    min-width: 520px;
}

.project-table--matrix th,
.project-table--matrix td {
    text-align: center;
}

.project-table--matrix tbody th {
    background: transparent;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: normal;
    text-align: left;
    text-transform: none;
}

.project-table--matrix tbody td {
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
}


/* Project content helpers */

.project-callout {
    margin: 20px 0;
    padding: 16px 18px;
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    background: var(--accent-soft);
    color: var(--text-dim);
    font-size: 0.9rem;
    line-height: 1.7;
}

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

.project-subheading {
    margin: 30px 0 10px;
    color: var(--accent);
    font-size: 1rem;
}

.project-list {
    margin: 16px 0 0;
    padding-left: 22px;
    color: var(--text-muted);
    line-height: 1.7;
}

.project-list li {
    margin-bottom: 10px;
}

.project-list li:last-child {
    margin-bottom: 0;
}

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

.project-source-link {
    color: var(--accent);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.project-source-link:hover {
    color: var(--accent-hover);
}


/* Back button */

.back-projects {
    text-align: center;
    margin-top: 50px;
}


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

@media (max-width: 900px) {

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .projects-container {
        grid-template-columns: 1fr 1fr;
        gap: 22px;
    }

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

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

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

    .footer-main {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
        padding: 44px 6% 36px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

}

@media (max-width: 700px) {

    .case-study-grid {
        grid-template-columns: 1fr;
    }

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

    .case-study-dashboard img {
        width: 94%;
    }

}

@media (max-width: 650px) {

    section {
        padding: var(--section-padding-mobile) 6%;
    }

    /* Hero */

    .hero-video {
        display: none;
    }

    /* Mobile navigation */

    header {
        background: rgba(11, 17, 32, 0.92);
    }

    nav {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 10px 16px;
        padding: 14px 20px;
    }

    .nav-toggle {
        display: inline-flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;

        width: 42px;
        height: 42px;
        padding: 10px;

        background: transparent;
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        cursor: pointer;

        transition: border-color var(--transition-fast);
    }

    .nav-toggle:hover {
        border-color: var(--accent-border);
    }

    .nav-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        border-radius: 2px;
        background: var(--text-dim);
        transition:
            transform var(--transition),
            opacity var(--transition),
            background-color var(--transition);
    }

    .nav-toggle[aria-expanded="true"] span {
        background: var(--accent);
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle[aria-expanded="true"] span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .nav-links {
        flex-basis: 100%;
        display: none;
        flex-direction: column;
        gap: 2px;
        padding-top: 10px;
        border-top: 1px solid var(--border);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: 12px 14px;
        border-radius: var(--radius-md);
        font-size: 0.95rem;
    }

    .nav-links a::after {
        display: none;
    }

    .nav-links a:hover {
        color: var(--accent);
        background: var(--accent-soft);
    }

    /* Hero */

    .hero-content {
        padding-top: 110px;
    }

    .hero h1 {
        font-size: clamp(2.5rem, 12vw, 3rem);
    }

    .hero h2 {
        font-size: 1.1rem;
    }

    .hero-description {
        font-size: 1.05rem;
    }

    .hero-scroll {
        display: none;
    }

    .hero-tools span {
        padding: 6px 13px;
        font-size: 0.78rem;
    }

    .hero-buttons a {
        padding: 12px 22px;
    }

    /* Grids */

    .about-grid,
    .skills-grid,
    .projects-container,
    .contact-layout {
        grid-template-columns: 1fr;
    }

    .projects-container {
        gap: 24px;
    }

    .project-content {
        padding: 20px 22px 24px;
    }

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

    .project-metrics {
        grid-template-columns: 1fr;
    }

    .project-table th,
    .project-table td {
        padding: 10px 12px;
    }

    .about-profile {
        padding: 26px 22px;
    }

    /* Timeline */

    .education-timeline {
        padding-left: 24px;
    }

    .education-card-marker {
        left: -24px;
        width: 10px;
        height: 10px;
    }

    .education-card-body {
        padding: 20px 20px;
    }

    /* Certifications */

    .certification-card {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 24px;
    }

    .certification-image-link {
        max-width: 360px;
    }

    .certification-document-link {
        width: 100%;
        max-width: 360px;
    }

    .cert-lightbox {
        padding: 24px;
    }

    .cert-lightbox-image {
        max-width: 95vw;
    }

    /* Footer */

    .footer-main {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 36px 6% 30px;
    }

    .footer-brand {
        grid-column: auto;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 14px;
        text-align: center;
        padding: 18px 6%;
    }

}

@media (max-width: 480px) {

    .hero-buttons a {
        width: 100%;
        max-width: 280px;
    }

}