/* ─────────────────────────────────────────────────────────────────────
    DESIGN TOKENS
    Original palette preserved exactly: #000, #0a0a0a, #7c5cff, #b3b3b3.
    Refinements are structural (spacing, type scale) not chromatic.
───────────────────────────────────────────────────────────────────── */
:root {
    --bg-primary:    #000000;
    --bg-secondary:  #0a0a0a;
    --bg-card:       rgba(255, 255, 255, 0.02);
    --bg-card-hover: rgba(124, 92, 255, 0.06);

    --text-primary:   #ffffff;
    --text-secondary: #b3b3b3;
    --text-dim:       #444;

    --accent:        #7c5cff;
    --accent-soft:   #9a7dff;
    --accent-bright: #b69cff;
    --accent-deep:   #5b3df5;

    --border-soft:   rgba(255, 255, 255, 0.08);
    --border-accent: rgba(124, 92, 255, 0.4);

    --gradient-accent: linear-gradient(90deg, #5b3df5 0%, #7c5cff 45%, #b69cff 100%);

    --ff-display: 'Syne', sans-serif;
    --ff-body:    'DM Sans', sans-serif;
    --ff-mono:    'DM Mono', monospace;

    --radius-sm:   8px;
    --radius-md:   14px;
    --radius-lg:   20px;
    --radius-full: 999px;

    --transition:     250ms ease;
    --shadow-purple:  0 10px 28px rgba(124, 92, 255, 0.18);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--ff-body);
    font-size: 1rem;
    line-height: 1.7;
    overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

section { scroll-margin-top: 100px; }

/* ─────────────────────────────────────────────────────────────────────
    UTILITIES
───────────────────────────────────────────────────────────────────── */
.container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: 24px;
}

.section { padding-block: 120px; }

.section__eyebrow {
    display: inline-block;
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--accent-soft);
    margin-bottom: 10px;
}

.section__title {
    font-family: var(--ff-display);
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 12px;
}

.section__sub {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 56ch;
    margin-bottom: 48px;
}

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

/* ─────────────────────────────────────────────────────────────────────
    BUTTONS
───────────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-family: var(--ff-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
}

.btn--primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 16px rgba(124, 92, 255, 0.3);
}
.btn--primary:hover {
    opacity: .88;
    transform: translateY(-1px);
    box-shadow: 0 6px 22px rgba(124, 92, 255, 0.42);
}

.btn--ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-soft);
}
.btn--ghost:hover {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.btn--outline-accent {
    background: transparent;
    color: var(--accent-soft);
    border: 1px solid rgba(124, 92, 255, 0.3);
    border-radius: var(--radius-full);
    padding: 8px 18px;
    font-size: 0.82rem;
    font-family: var(--ff-body);
    cursor: pointer;
    transition: all var(--transition);
}
.btn--outline-accent:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 0 1px var(--accent);
}

/* ─────────────────────────────────────────────────────────────────────
    TAGS
───────────────────────────────────────────────────────────────────── */
.tags { display: flex; flex-wrap: wrap; gap: 7px; }

.tag {
    font-family: var(--ff-mono);
    font-size: 0.74rem;
    padding: 5px 11px;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    background: var(--bg-card);
    transition: border-color var(--transition), color var(--transition);
}
.tag:hover {
    border-color: var(--accent);
    color: var(--accent-soft);
}

/* ─────────────────────────────────────────────────────────────────────
    DIVIDER
───────────────────────────────────────────────────────────────────── */
.divider {
    height: 1px;
    background: var(--border-soft);
    max-width: 1200px;
    margin-inline: auto;
}

/* ─────────────────────────────────────────────────────────────────────
    NAV
───────────────────────────────────────────────────────────────────── */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding-block: 22px;
    transition: background var(--transition), border-bottom var(--transition);
}

.nav.nav--scrolled {
    background: rgba(0, 0, 0, .88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-soft);
}

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

.nav__logo {
    font-family: var(--ff-display);
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: .01em;
}

.nav__links {
    display: none;
    gap: 36px;
}

.nav__link {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}
.nav__link:hover,
.nav__link.active { color: var(--text-primary); }

/* Hamburger */
.nav__burger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}
.nav__burger span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--text-primary);
    transition: transform var(--transition), opacity var(--transition);
}
.nav__burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav__drawer {
    position: fixed;
    inset: 0;
    background: var(--bg-secondary);
    z-index: 99;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    transform: translateX(100%);
    transition: transform 280ms cubic-bezier(.4,0,.2,1);
}
.nav__drawer.open { transform: translateX(0); }

.nav__drawer .drawer-link {
    font-family: var(--ff-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color var(--transition);
}
.nav__drawer .drawer-link:hover { color: var(--accent-soft); }

/* ─────────────────────────────────────────────────────────────────────
    HERO
───────────────────────────────────────────────────────────────────── */
.hero {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px;
    padding-bottom: 40px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(to bottom, var(--bg-primary), var(--bg-secondary));
}

/* Ambient radial glow — subtle, consistent with original purple identity */
.hero::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(720px, 100vw);
    height: 500px;
    background: radial-gradient(ellipse, rgba(124,92,255,.1) 0%, transparent 68%);
    pointer-events: none;
}

.hero__content { position: relative; z-index: 1; }

.hero__eyebrow {
    font-family: var(--ff-mono);
    font-size: 0.74rem;
    color: var(--accent-soft);
    letter-spacing: .18em;
    text-transform: uppercase;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}
.hero__eyebrow::before,
.hero__eyebrow::after {
    content: '';
    width: 2rem;
    height: 1px;
    background: var(--accent-soft);
    opacity: .45;
}

.hero__name {
    font-family: var(--ff-display);
    font-size: clamp(3.5rem, 10vw, 6.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -.025em;
    margin-bottom: 20px;
    animation: revealName 1.1s ease-out both;
}

@keyframes revealName {
    from { opacity: 0; transform: translateY(22px); letter-spacing: .08em; }
    to   { opacity: 1; transform: translateY(0);    letter-spacing: -.025em; }
}

.hero__tagline {
    font-family: var(--ff-display);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.hero__desc {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 50ch;
    margin: 0 auto 40px;
    line-height: 1.78;
}

.hero__actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 48px;
}

.hero__social {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.hero__social-link {
    font-size: 0.88rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-soft);
    padding: 8px 20px;
    border-radius: var(--radius-full);
    transition: border-color var(--transition), color var(--transition);
}
.hero__social-link:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

/* ─────────────────────────────────────────────────────────────────────
    ABOUT
───────────────────────────────────────────────────────────────────── */
.about { background: var(--bg-primary); }

.about__grid {
    display: grid;
    gap: 56px;
    align-items: center;
}

.about__image-wrap {
    max-width: 400px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-soft);
    transition: transform .4s ease, box-shadow .4s ease;
}
.about__image-wrap:hover {
    transform: scale(1.02);
    box-shadow: 0 12px 32px rgba(124, 92, 255, 0.15);
}
.about__image-wrap img { width: 100%; object-fit: cover; }

.about__text p {
    font-size: 0.96rem;
    color: var(--text-secondary);
    line-height: 1.82;
}
.about__text p + p { margin-top: 16px; }
.about__text strong { color: var(--text-primary); font-weight: 500; }

.about__stack { margin-top: 32px; }

.about__stack-label {
    font-family: var(--ff-mono);
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: .14em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

/* ─────────────────────────────────────────────────────────────────────
    PROJECTS
───────────────────────────────────────────────────────────────────── */
.projects { background: var(--bg-secondary); }

.projects__grid {
    display: grid;
    gap: 20px;
}

.project-card {
    padding: 26px 28px;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: transform var(--transition) ease-in-out, 
                border-color var(--transition) ease-in-out,
                box-shadow var(--transition) ease-in-out, 
                background var(--transition) ease-in-out;
                
}
.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-purple);
}

.project-card__num {
    font-family: var(--ff-mono);
    font-size: 0.68rem;
    color: var(--text-dim);
    letter-spacing: .08em;
}

.project-card__name {
    font-family: var(--ff-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.project-card__desc {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--text-secondary);
    flex: 1;
}

.project-card__highlights {
    padding: 12px 14px;
    background: rgba(124,92,255,.05);
    border-left: 2px solid var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.project-card__highlights li {
    font-family: var(--ff-mono);
    font-size: 0.73rem;
    color: var(--text-secondary);
    line-height: 1.9;
}
.project-card__highlights li::before {
    content: '→ ';
    color: var(--accent-soft);
}

.project-card__actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ─────────────────────────────────────────────────────────────────────
    CERTIFICATES
───────────────────────────────────────────────────────────────────── */
.certificates { background: var(--bg-primary); }

.certs__grid { display: grid; gap: 16px; }

.cert-card {
    background: var(--bg-card);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    padding: 22px 24px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: border-color var(--transition);
}
.cert-card:hover { border-color: var(--border-accent); }

.cert-card__name {
    font-family: var(--ff-display);
    font-size: 1rem;
    font-weight: 600;
}

.cert-card__meta {
    font-family: var(--ff-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    display: flex;
    gap: 20px;
}

.cert-card__link {
    font-family: var(--ff-mono);
    font-size: 0.74rem;
    color: var(--accent-soft);
    width: fit-content;
    margin-top: 4px;
    transition: opacity var(--transition);
}
.cert-card__link:hover { opacity: .7; }

.cert-placeholder {
    border-style: dashed;
    text-align: center;
    padding: 52px;
    color: var(--text-dim);
    font-family: var(--ff-mono);
    font-size: 0.84rem;
}

/* ─────────────────────────────────────────────────────────────────────
    CONTACT
───────────────────────────────────────────────────────────────────── */
.contact { background: var(--bg-primary); }

.contact__layout { display: grid; gap: 48px; }

.contact__info p {
    font-size: 0.96rem;
    color: var(--text-secondary);
    line-height: 1.78;
    margin-bottom: 24px;
}

.contact__info-links { display: flex; flex-direction: column; gap: 12px; }

.contact__info-link {
    font-family: var(--ff-mono);
    font-size: 0.84rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    width: fit-content;
    transition: color var(--transition);
    position: relative;
}
.contact__info-link::before { content: '→'; color: var(--accent-soft); flex-shrink: 0; }
.contact__info-link:hover   { color: var(--text-primary); }

/* Form */
.form { display: flex; flex-direction: column; gap: 20px; }

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

.form__label {
    font-family: var(--ff-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: .14em;
    text-transform: uppercase;
}

.form__input,
.form__textarea {
    background: rgba(255,255,255,.03);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-sm);
    padding: 13px 16px;
    color: var(--text-primary);
    font-family: var(--ff-body);
    font-size: 0.95rem;
    outline: none;
    width: 100%;
    transition: border-color var(--transition);
}
.form__input::placeholder,
.form__textarea::placeholder { color: var(--text-dim); }
.form__input:focus,
.form__textarea:focus { border-color: var(--accent); }
.form__input.error,
.form__textarea.error { border-color: #e74c3c; }

.form__textarea { resize: vertical; min-height: 140px; }

.form__error {
    font-family: var(--ff-mono);
    font-size: 0.7rem;
    color: #e74c3c;
    display: none;
}
.form__error.visible { display: block; }

.form__feedback {
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--ff-mono);
    font-size: 0.84rem;
    display: none;
}
.form__feedback.success {
    display: block;
    background: rgba(124,92,255,.08);
    border: 1px solid rgba(124,92,255,.3);
    color: var(--accent-soft);
}
.form__feedback.error-msg {
    display: block;
    background: rgba(231,76,60,.06);
    border: 1px solid #c0392b;
    color: #e74c3c;
}

/* ─────────────────────────────────────────────────────────────────────
    FOOTER
───────────────────────────────────────────────────────────────────── */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-soft);
    padding-block: 48px;
}

.footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    text-align: center;
}

.footer__logo {
    font-family: var(--ff-display);
    font-weight: 800;
    font-size: 1.1rem;
}

.footer__links { display: flex; gap: 28px; }

.footer__link {
    font-size: 0.88rem;
    color: var(--text-secondary);
    position: relative;
    transition: color var(--transition);
}
.footer__link::after {
    content: '';
    position: absolute;
    left: 0; bottom: -5px;
    width: 0; height: 1px;
    background: var(--gradient-accent);
    transition: width var(--transition);
}
.footer__link:hover { color: var(--text-primary); }
.footer__link:hover::after { width: 100%; }

.footer__copy {
    font-family: var(--ff-mono);
    font-size: 0.73rem;
    color: var(--text-dim);
}

/* ─────────────────────────────────────────────────────────────────────
    SCROLL REVEAL
───────────────────────────────────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 480ms ease, transform 480ms ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger siblings inside reveal-group */
.reveal-group .project-card:nth-child(1) { transition-delay:   0ms; }
.reveal-group .project-card:nth-child(2) { transition-delay:  70ms; }
.reveal-group .project-card:nth-child(3) { transition-delay: 140ms; }
.reveal-group .project-card:nth-child(4) { transition-delay: 210ms; }
.reveal-group .project-card:nth-child(5) { transition-delay: 280ms; }
.reveal-group .project-card:nth-child(6) { transition-delay: 350ms; }

/* ─────────────────────────────────────────────────────────────────────
    RESPONSIVE — desktop breakpoints
───────────────────────────────────────────────────────────────────── */
@media (min-width: 768px) {
    .nav__links  { display: flex; }
    .nav__burger { display: none; }

    .about__grid {
    grid-template-columns: 1fr 300px;
    align-items: center;
    }
    .about__image-wrap { order: 1; }
    .about__text       { order: 0; }

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

    .contact__layout {
    grid-template-columns: 1fr 1.5fr;
    align-items: start;
    }

    .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    }
}

@media (min-width: 1024px) {
    .projects__grid { grid-template-columns: repeat(3, 1fr); }
    .certs__grid    { grid-template-columns: repeat(3, 1fr); }
}