/* ═══════════════════════════════════════════════
   THEME TOKENS
═══════════════════════════════════════════════ */
:root {
    --violet: #6d28d9;
    --violet-2: #7c3aed;
    --violet-3: #8b5cf6;
    --radius: 8px;
    --ease: cubic-bezier(.4, 0, .2, 1);
    --transition: all 0.3s var(--ease);
    --text-primary: var(--ink);
    --text-secondary: var(--mid);
    --bg-primary: var(--bg);
    --bg-secondary: var(--surface);
}

[data-theme="light"] {
    --bg: #f8f7ff;
    --surface: #ffffff;
    --surface-2: #f5f3ff;
    --ink: #18171f;
    --mid: #6b6880;
    --subtle: #9c99ac;
    --violet-lt: #ede9fe;
    --violet-xlt: #f5f3ff;
    --border: #e4e0f5;
    --nav-bg: rgba(248, 247, 255, 0.92);
    --card-shadow: 0 2px 12px rgba(109, 40, 217, .07);
    --skills-bg: #18171f;
    --skills-item-bg: #1c1926;
    --skills-item-hov: #21202e;
    --skills-border: #24202e;
    --skills-name: #e0dcf4;
    --skills-cat: #4c4868;
    --contact-bg: var(--violet);
    --contact-ink: #ffffff;
    --contact-mid: rgba(255, 255, 255, .6);
    --footer-bg: #18171f;
    --footer-ink: #4c4868;
    --toggle-bg: #e4e0f5;
    --toggle-knob: #7c3aed;
    --toggle-icon: "☀️";
}

[data-theme="dark"] {
    --bg: #0f0e17;
    --surface: #171620;
    --surface-2: #1e1c2a;
    --ink: #eeeaf8;
    --mid: #9893b0;
    --subtle: #5c5878;
    --violet-lt: #2d1f5e;
    --violet-xlt: #1e1838;
    --border: #2d2a3e;
    --nav-bg: rgba(15, 14, 23, 0.92);
    --card-shadow: 0 2px 20px rgba(0, 0, 0, .35);
    --skills-bg: #0a0912;
    --skills-item-bg: #13111e;
    --skills-item-hov: #1a1828;
    --skills-border: #1e1c2a;
    --skills-name: #d4cff0;
    --skills-cat: #3e3a58;
    --contact-bg: #1e1838;
    --contact-ink: #eeeaf8;
    --contact-mid: rgba(238, 234, 248, .5);
    --footer-bg: #0a0912;
    --footer-ink: #3e3a58;
    --toggle-bg: #2d2a3e;
    --toggle-knob: #8b5cf6;
    --toggle-icon: "🌙";
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    transition: var(--transition);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('data:image/svg+xml;utf8,<svg ...>');
    opacity: 0.015;
    pointer-events: none;
}

::-webkit-scrollbar {
    width: 4px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--violet-3);
    border-radius: 2px;
}

/* ═══════════════════════════════════════════════
   THEME TOGGLE
═══════════════════════════════════════════════ */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--toggle-bg);
    border: 1px solid var(--border);
    border-radius: 100px;
    padding: 0.25rem 0.6rem 0.25rem 0.35rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.75rem;
    color: var(--mid);
    user-select: none;
}

.theme-toggle:hover {
    border-color: var(--violet-3);
}

.toggle-track {
    width: 32px;
    height: 18px;
    background: var(--toggle-bg);
    border: 1px solid var(--border);
    border-radius: 100px;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.toggle-knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
    background: var(--toggle-knob);
    border-radius: 50%;
    transition: transform 0.3s cubic-bezier(.4, 0, .2, 1), background 0.3s;
}

[data-theme="dark"] .toggle-knob {
    transform: translateX(14px);
}

.toggle-label {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--mid);
    white-space: nowrap;
}

/* ═══════════════════════════════════════════════
   NAV
═══════════════════════════════════════════════ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5vw;
    height: 64px;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

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

.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    color: var(--ink);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-logo span {
    color: var(--violet-2);
    font-style: italic;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--mid);
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 1px;
    background: var(--violet-2);
    transition: width 0.25s;
}

.nav-links a:hover {
    color: var(--violet-2);
}

.nav-links a:hover::after {
    width: 100%;
}

/* ═══════════════════════════════════════════════
   HERO
═══════════════════════════════════════════════ */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 64px 5vw 0;
    gap: 4rem;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    transition: var(--transition);
    background:
        radial-gradient(ellipse 60% 70% at 80% 40%, rgba(139, 92, 246, 0.09) 0%, transparent 70%),
        radial-gradient(ellipse 40% 50% at 15% 75%, rgba(109, 40, 217, 0.06) 0%, transparent 60%);
}

[data-theme="dark"] .hero-bg {
    background:
        radial-gradient(ellipse 60% 70% at 80% 40%, rgba(139, 92, 246, 0.18) 0%, transparent 70%),
        radial-gradient(ellipse 40% 50% at 15% 75%, rgba(109, 40, 217, 0.12) 0%, transparent 60%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image: linear-gradient(rgba(109, 40, 217, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(109, 40, 217, 0.04) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 20%, transparent 100%);
}

[data-theme="dark"] .hero-grid {
    background-image: linear-gradient(rgba(139, 92, 246, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(139, 92, 246, 0.07) 1px, transparent 1px);
}

.hero-left {
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--violet-lt);
    color: var(--violet-3);
    font-size: 0.68rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.4rem 0.9rem;
    border-radius: 100px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.hero,
section,
.project-card,
.cert-card {
    contain: layout paint;
}

.pulse {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--violet-2);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1)
    }

    50% {
        opacity: .4;
        transform: scale(.7)
    }
}

h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(3rem, 5.5vw, 5.5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--ink);
    margin-bottom: 1.5rem;
    transition: color 0.3s;
}

h1 em {
    font-style: italic;
    color: var(--violet-2);
    font-weight: 400;
}

.hero-sub {
    font-size: 1rem;
    color: var(--mid);
    max-width: 40ch;
    line-height: 1.8;
    margin-bottom: 2.5rem;
    transition: color 0.3s;
}

.ctas {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.08);
    opacity: 0;
    transition: opacity 0.2s;
}

.btn:hover::after {
    opacity: 1;
}

.btn-primary {
    background: var(--violet);
    color: #fff;
    box-shadow: 0 4px 14px rgba(109, 40, 217, .3);
}

.btn-primary:hover {
    background: var(--violet-2);
    box-shadow: 0 6px 20px rgba(109, 40, 217, .4);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    border-color: var(--violet-3);
    color: var(--violet-3);
    background: var(--violet-xlt);
}

/* STAT CARDS */
.hero-right {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.1rem 1.4rem;
    display: flex;
    align-items: center;
    gap: 1.1rem;
    box-shadow: var(--card-shadow);
    transition: transform .3s, box-shadow .3s, background 0.35s, border-color 0.35s;
    opacity: 0;
    animation: riseIn .5s ease forwards;
}

.stat-card:nth-child(1) {
    animation-delay: .1s
}

.stat-card:nth-child(2) {
    animation-delay: .22s
}

.stat-card:nth-child(3) {
    animation-delay: .34s
}

.stat-card:nth-child(4) {
    animation-delay: .46s
}

@keyframes riseIn {
    from {
        opacity: 0;
        transform: translateX(22px)
    }

    to {
        opacity: 1;
        transform: translateX(0)
    }
}

.stat-card:hover {
    transform: translateY(-5px) translateZ(0);
    will-change: transform;
    box-shadow: 4px 4px 0 var(--violet-3), 0 4px 20px rgba(109, 40, 217, .15);
}

.stat-icon {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    background: var(--violet-lt);
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: background 0.35s;
}

.stat-label {
    font-size: 0.65rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--subtle);
    margin-bottom: 1px;
    transition: color 0.3s;
}

.stat-value {
    font-family: 'Playfair Display', serif;
    font-size: 1rem;
    color: var(--ink);
    transition: color 0.3s;
}

/* ═══════════════════════════════════════════════
   SECTIONS
═══════════════════════════════════════════════ */
section {
    padding: 6rem 5vw;
    transition: background 0.35s;
}

.sec-label {
    display: inline-flex;
    align-items: center;
    gap: .6rem;
    font-size: .68rem;
    font-weight: 500;
    letter-spacing: .15em;
    text-transform: uppercase;
    color: var(--violet-3);
    margin-bottom: .8rem;
}

.sec-label::before {
    content: '';
    width: 20px;
    height: 1px;
    background: var(--violet-3);
}

h2 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--ink);
    margin-bottom: .6rem;
    transition: color 0.3s;
}

.sec-intro {
    font-size: .9rem;
    color: var(--mid);
    max-width: 52ch;
    line-height: 1.8;
    margin-bottom: 2.75rem;
    transition: color 0.3s;
}

/* ═══════════════════════════════════════════════
   SKILLS
═══════════════════════════════════════════════ */
#skills {
    background: var(--skills-bg);
}

#skills h2 {
    color: #fff;
}

#skills .sec-intro {
    color: rgba(255, 255, 255, .35);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
    gap: 1px;
    border: 1px solid var(--skills-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.skill-item {
    background: var(--skills-item-bg);
    padding: 1.3rem 1.4rem;
    display: flex;
    flex-direction: column;
    gap: .35rem;
    transition: background .2s;
    position: relative;
    overflow: hidden;
}

.skill-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--violet), var(--violet-3));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .3s;
}

.skill-item:hover {
    background: var(--skills-item-hov);
}

.skill-item:hover::before {
    transform: scaleX(1);
}

.skill-name {
    font-size: .85rem;
    font-weight: 400;
    color: var(--skills-name);
}

.skill-cat {
    font-size: .6rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--skills-cat);
}

/* ═══════════════════════════════════════════════
   CERTIFICATIONS
═══════════════════════════════════════════════ */
#certifications {
    background: var(--violet-xlt);
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.1rem;
}

.cert-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition: transform .25s, box-shadow .25s, background 0.35s, border-color 0.35s;
}

.cert-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(109, 40, 217, .05), transparent 60%);
    opacity: 0;
    transition: opacity .3s;
    border-radius: var(--radius);
}

.cert-card:hover {
    transform: translateY(-5px) translateZ(0);
    will-change: transform;
    box-shadow: 0 16px 40px rgba(109, 40, 217, .15);
}

.cert-card:hover::after {
    opacity: 1;
}

.cert-badge {
    width: 38px;
    height: 38px;
    background: var(--violet-lt);
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 1.1rem;
    transition: background 0.35s;
}

.cert-issuer {
    font-size: .62rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--violet-3);
    font-weight: 500;
    margin-bottom: .4rem;
}

.cert-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--ink);
    margin-bottom: .6rem;
    flex: 1;
    transition: color 0.3s;
}

.cert-desc {
    font-size: .78rem;
    color: var(--mid);
    line-height: 1.7;
    margin-bottom: 1.25rem;
    transition: color 0.3s;
}

.cert-link {
    font-size: .68rem;
    font-weight: 500;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--violet-3);
    display: flex;
    align-items: center;
    gap: .3rem;
}

.cert-link svg {
    transition: transform .2s;
}

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

/* ═══════════════════════════════════════════════
   PROJECTS
═══════════════════════════════════════════════ */
#projects {
    background: var(--surface);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 1.1rem;
}

.project-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg);
    transition: transform .25s, box-shadow .25s, background 0.35s, border-color 0.35s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-card:hover {
    transform: translateY(-5px) translateZ(0);
    will-change: transform;
    box-shadow: 0 20px 48px rgba(109, 40, 217, .15);
}

.project-thumb {
    height: 148px;
    background: linear-gradient(135deg, var(--violet-lt), var(--border));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.6rem;
    position: relative;
    overflow: hidden;
    transition: background 0.35s;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 9, 18, .88);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .3s;
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.overlay-label {
    font-size: .68rem;
    font-weight: 500;
    letter-spacing: .15em;
    text-transform: uppercase;
    color: #fff;
}

.project-body {
    padding: 1.3rem;
}

.project-tag {
    font-size: .6rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--violet-3);
    font-weight: 500;
    margin-bottom: .35rem;
}

.project-name {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: .35rem;
    transition: color 0.3s;
}

.project-desc {
    font-size: .76rem;
    color: var(--mid);
    line-height: 1.7;
    margin-bottom: .9rem;
    transition: color 0.3s;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: .3rem;
}

.tag {
    font-size: .6rem;
    font-weight: 500;
    background: var(--violet-lt);
    color: var(--violet-3);
    padding: .18rem .5rem;
    border-radius: 4px;
    transition: background 0.35s, color 0.35s;
}

.projects-note {
    margin-top: 1.75rem;
    text-align: center;
    font-size: .78rem;
    color: var(--subtle);
    font-style: italic;
    transition: color 0.3s;
}

.projects-note a {
    color: var(--violet-3);
    text-decoration: none;
}

/* ═══════════════════════════════════════════════
   CONTACT
═══════════════════════════════════════════════ */
#contact {
    background: var(--contact-bg);
    position: relative;
    overflow: hidden;
}

#contact::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 580px;
    height: 580px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .04);
    pointer-events: none;
}

#contact::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -15%;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .03);
    pointer-events: none;
}

.contact-inner {
    max-width: 580px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

#contact .sec-label {
    color: rgba(255, 255, 255, .5);
    justify-content: center;
}

#contact .sec-label::before {
    background: rgba(255, 255, 255, .3);
}

#contact h2 {
    color: var(--contact-ink);
    margin-bottom: .75rem;
}

#contact .sec-intro {
    color: var(--contact-mid);
    margin-bottom: 2.25rem;
    max-width: 100%;
}

.contact-btns {
    display: flex;
    justify-content: center;
    gap: .85rem;
    flex-wrap: wrap;
}

.btn-white {
    background: #fff;
    color: var(--violet);
    font-weight: 500;
}

.btn-white:hover {
    background: var(--violet-lt);
    transform: translateY(-1px);
}

.btn-outline-white {
    background: transparent;
    color: var(--contact-ink);
    border: 1px solid rgba(255, 255, 255, .3);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, .1);
    border-color: rgba(255, 255, 255, .6);
}

.contact-meta {
    margin-top: 2.25rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-meta span {
    font-size: .78rem;
    color: var(--contact-mid);
}

/* ═══════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════ */
footer {
    padding: 1.4rem 5vw;
    background: var(--footer-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .7rem;
    color: var(--footer-ink);
    flex-wrap: wrap;
    gap: .75rem;
    transition: background 0.35s, color 0.35s;
}

footer a {
    color: var(--violet-3);
    text-decoration: none;
}

footer a:hover {
    color: var(--ink);
}

/* ═══════════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════════ */
.fade-up {
    opacity: 0;
    transform: translateY(24px) scale(.98);
    transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.fade-up.visible {
    opacity: 1;
    transform: none;
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════ */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        padding-top: 80px;
        gap: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    section {
        padding: 4rem 5vw;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
    }
}

/* ═══════════════════════════════════════════════
   KEYBOARD UX
═══════════════════════════════════════════════ */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--violet-3);
    outline-offset: 2px;
    border-radius: 4px;
}