/* =========================
   Sziklai Zsolt — sziklaizsolt.hu
   v2 · 2026
   ========================= */

:root {
    --bg-0: #0a0a14;
    --bg-1: #11111d;
    --bg-2: #16162a;
    --bg-card: rgba(255,255,255,0.03);
    --bg-card-hover: rgba(255,255,255,0.06);
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.16);
    --text-1: #f4f4f8;
    --text-2: #b8b8c8;
    --text-3: #7a7a90;
    --primary: #6c5ce7;
    --primary-2: #4fc3f7;
    --gradient: linear-gradient(135deg, #6c5ce7 0%, #4fc3f7 100%);
    --gradient-soft: linear-gradient(135deg, rgba(108,92,231,0.15), rgba(79,195,247,0.10));
    --shadow-card: 0 10px 30px rgba(0,0,0,0.35);
    --radius: 14px;
    --radius-lg: 20px;
    --max: 1200px;
    --tr: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-0);
    color: var(--text-1);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--primary-2); }

img { max-width: 100%; display: block; }

button {
    background: none;
    border: none;
    color: inherit;
    font-family: inherit;
    cursor: pointer;
}

.container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 24px;
}

.dot { color: var(--primary-2); }

/* =========================
   NAVIGATION
   ========================= */
#navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 18px 0;
    transition: all var(--tr);
    background: rgba(10,10,20,0);
    backdrop-filter: blur(0px);
}

#navbar.scrolled {
    background: rgba(10,10,20,0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.nav-container {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-menu a {
    color: var(--text-2);
    font-size: 0.94rem;
    font-weight: 500;
    position: relative;
    padding: 6px 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text-1);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    left: 0; right: 0;
    bottom: 0;
    height: 2px;
    background: var(--gradient);
    border-radius: 2px;
}

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
    padding: 4px 10px;
    border: 1px solid var(--border-strong);
    border-radius: 20px;
}

.lang-btn {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-3);
    padding: 2px 4px;
}

.lang-btn:hover { color: var(--text-1); }
.lang-btn.active {
    color: var(--primary-2);
}

.lang-sep { color: var(--text-3); }

#nav-toggle {
    display: none;
    font-size: 1.4rem;
    color: var(--text-1);
}

/* =========================
   HERO
   ========================= */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(108,92,231,0.18), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(79,195,247,0.14), transparent 50%),
        radial-gradient(circle at 50% 100%, rgba(108,92,231,0.10), transparent 60%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 80%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 880px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: var(--gradient-soft);
    border: 1px solid var(--border-strong);
    border-radius: 30px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-1);
    margin-bottom: 28px;
}

.hero-badge i { color: var(--primary-2); }

.hero-title {
    font-size: clamp(2.6rem, 7vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 22px;
}

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

.hero-subtitle {
    font-size: clamp(1rem, 1.6vw, 1.18rem);
    color: var(--text-2);
    max-width: 760px;
    margin: 0 auto 12px;
    font-weight: 400;
}

.hero-tagline {
    font-size: 0.95rem;
    color: var(--text-3);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.02em;
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 26px;
    border-radius: 30px;
    font-size: 0.96rem;
    font-weight: 600;
    transition: all var(--tr);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 6px 20px rgba(108,92,231,0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(108,92,231,0.5);
    color: #fff;
}

.btn-ghost {
    background: rgba(255,255,255,0.04);
    border-color: var(--border-strong);
    color: var(--text-1);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.08);
    border-color: var(--primary-2);
    color: var(--text-1);
}

.hero-scroll {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-3);
    font-size: 1.4rem;
    animation: bob 2.4s ease-in-out infinite;
    z-index: 1;
}

@keyframes bob {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, 8px); }
}

/* =========================
   SECTION
   ========================= */
.section {
    padding: 110px 0;
    position: relative;
}

.section-alt {
    background: var(--bg-1);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.section-subtitle {
    color: var(--text-3);
    font-size: 1rem;
    margin-bottom: 56px;
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.01em;
}

/* =========================
   ABOUT
   ========================= */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.about-text p {
    margin-bottom: 18px;
    color: var(--text-2);
    font-size: 1.04rem;
}

.about-text strong {
    color: var(--text-1);
    font-weight: 600;
}

.about-meta {
    margin-top: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 22px;
}

.meta-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    gap: 12px;
}

.meta-row:last-child { border-bottom: none; }

.meta-key {
    color: var(--text-3);
    font-size: 0.92rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.meta-val {
    color: var(--text-1);
    font-size: 0.98rem;
    text-align: right;
}

.about-side {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    transition: all var(--tr);
}

.card:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
}

.card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-1);
    letter-spacing: -0.01em;
}

.hobby-list,
.link-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.hobby-list li,
.link-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-2);
    font-size: 0.95rem;
}

.hobby-list i,
.link-list i {
    color: var(--primary-2);
    width: 18px;
}

.link-list a:hover { color: var(--primary-2); }

/* =========================
   EXPERIENCE / TIMELINE
   ========================= */
.timeline {
    position: relative;
    margin-top: 20px;
    padding-left: 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--primary-2), transparent);
    opacity: 0.5;
}

.t-item {
    position: relative;
    padding-left: 50px;
    margin-bottom: 30px;
}

.t-item::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 22px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bg-0);
    border: 2px solid var(--primary-2);
    z-index: 1;
}

.t-item.current::before {
    background: var(--primary-2);
    box-shadow: 0 0 0 4px rgba(79,195,247,0.2);
}

.t-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
    color: var(--primary-2);
    margin-bottom: 8px;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.t-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 26px;
    transition: all var(--tr);
}

.t-card:hover {
    border-color: var(--border-strong);
    transform: translateX(4px);
    box-shadow: var(--shadow-card);
}

.t-role {
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.t-org {
    font-size: 0.95rem;
    color: var(--primary-2);
    margin-bottom: 12px;
    font-weight: 500;
}

.t-desc {
    color: var(--text-2);
    font-size: 0.97rem;
    margin-bottom: 16px;
}

.t-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.t-tags span {
    font-size: 0.78rem;
    padding: 4px 12px;
    background: rgba(108,92,231,0.10);
    border: 1px solid rgba(108,92,231,0.25);
    color: var(--text-1);
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
}

/* =========================
   EDUCATION
   ========================= */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
}

.edu-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    transition: all var(--tr);
    position: relative;
    overflow: hidden;
}

.edu-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-soft);
    opacity: 0;
    transition: opacity var(--tr);
    pointer-events: none;
}

.edu-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.edu-card:hover::before { opacity: 1; }

.edu-card > * { position: relative; z-index: 1; }

.edu-years {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.84rem;
    color: var(--primary-2);
    margin-bottom: 8px;
    font-weight: 500;
}

.edu-card h3 {
    font-size: 1.14rem;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.edu-school {
    color: var(--text-2);
    font-size: 0.96rem;
    margin-bottom: 10px;
    font-weight: 500;
}

.edu-degree {
    color: var(--text-3);
    font-size: 0.88rem;
    font-family: 'JetBrains Mono', monospace;
}

/* =========================
   TEACHING
   ========================= */
.teach-intro {
    max-width: 880px;
    margin-bottom: 40px;
}

.teach-intro p {
    color: var(--text-2);
    font-size: 1.04rem;
}

.teach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
}

.teach-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--tr);
}

.teach-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.teach-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: var(--gradient-soft);
    border: 1px solid var(--border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: var(--primary-2);
    font-size: 1.3rem;
}

.teach-card h3 {
    font-size: 1.14rem;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.teach-card p {
    color: var(--text-2);
    font-size: 0.96rem;
}

/* =========================
   PROJECTS
   ========================= */
.proj-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.proj-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    transition: all var(--tr);
    position: relative;
}

.proj-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.proj-card.highlight {
    border-color: rgba(108,92,231,0.4);
    background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(79,195,247,0.04));
}

.proj-card.proj-link {
    color: var(--text-1);
    cursor: pointer;
    display: block;
}

.proj-card.proj-link:hover {
    border-color: var(--primary-2);
    color: var(--text-1);
}

.proj-card.proj-link:hover .proj-ext {
    transform: translate(2px, -2px);
    color: var(--primary-2);
}

.proj-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.74rem;
    font-weight: 700;
    color: #4caf50;
    margin-bottom: 12px;
    letter-spacing: 0.08em;
}

.proj-tag i {
    font-size: 0.5rem;
    animation: pulse 2s ease-in-out infinite;
}

.proj-tag .proj-ext {
    font-size: 0.78rem;
    color: var(--text-3);
    margin-left: auto;
    animation: none;
    transition: transform var(--tr), color var(--tr);
}

.proj-ext {
    font-size: 0.78rem;
    color: var(--text-3);
    transition: transform var(--tr), color var(--tr);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.proj-card h3 {
    font-size: 1.16rem;
    font-weight: 700;
    color: var(--text-1);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.proj-meta {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: var(--primary-2);
    margin-bottom: 12px;
}

.proj-card p {
    color: var(--text-2);
    font-size: 0.94rem;
    margin-bottom: 16px;
}

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

.proj-tags span {
    font-size: 0.74rem;
    padding: 3px 10px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    color: var(--text-2);
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
}

/* =========================
   CONTACT
   ========================= */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.c-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 22px;
    text-align: center;
    transition: all var(--tr);
    color: var(--text-1);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.c-card:not(.c-card-static):hover {
    border-color: var(--primary-2);
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    color: var(--text-1);
}

.c-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--gradient-soft);
    border: 1px solid var(--border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-2);
    font-size: 1.2rem;
    margin-bottom: 14px;
}

.c-label {
    font-size: 0.78rem;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 4px;
    font-weight: 600;
}

.c-val {
    font-size: 0.95rem;
    color: var(--text-1);
    font-weight: 500;
    word-break: break-word;
}

/* =========================
   FOOTER
   ========================= */
footer {
    padding: 36px 0;
    border-top: 1px solid var(--border);
    background: var(--bg-1);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 800;
}

.footer-text {
    color: var(--text-3);
    font-size: 0.88rem;
}

.footer-links {
    display: flex;
    gap: 14px;
}

.footer-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-2);
    transition: all var(--tr);
}

.footer-links a:hover {
    border-color: var(--primary-2);
    color: var(--primary-2);
    transform: translateY(-2px);
}

/* =========================
   RESPONSIVE
   ========================= */
@media (max-width: 980px) {
    .about-grid { grid-template-columns: 1fr; }
    .proj-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
    #nav-toggle { display: block; }
    .nav-menu {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: rgba(10,10,20,0.96);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 24px;
        gap: 18px;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--tr);
    }
    .nav-menu.active {
        max-height: 600px;
    }
    .lang-switch {
        margin-left: 0;
    }
    .section { padding: 70px 0; }
    .edu-grid,
    .teach-grid,
    .proj-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .meta-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    .meta-val { text-align: left; }
    .timeline::before { left: 8px; }
    .t-item { padding-left: 36px; }
    .t-item::before { left: 2px; }
}