/* =========================
   RESET
========================= */

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

html {
    scroll-behavior: smooth;
}

body {

    font-family: "Inter", sans-serif;

     background:
        radial-gradient(
            circle at top,
            rgba(59,130,246,.08),
            transparent 45%
        ),
        var(--background);

    color: var(--text-primary);

    line-height: 1.7;

    overflow-x: hidden;

    transition:
        background .3s ease,
        color .3s ease;
}

/* =========================
   VARIABLES
========================= */

:root {
    --background: #09090b;
    --surface: #111827;
    --surface-hover: #1f2937;
    --border: #27272a;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --container: 1200px;
}

[data-theme="light"] {

    --background: #f8fafc;

    --surface: #ffffff;

    --surface-hover: #f1f5f9;

    --border: #e2e8f0;

    --text-primary: #0f172a;

    --text-secondary: #475569;

    --accent: #2563eb;

    --accent-hover: #1d4ed8;

}

/* =========================
   GLOBAL
========================= */

main {
    width: 100%;
}

.section {
    max-width: var(--container);
    margin: 0 auto;
    padding: 120px 24px;
}

.section h2 {
    font-size: 2.4rem;
    margin-bottom: 24px;
    font-weight: 700;
}

.section p {
    color: var(--text-secondary);
    max-width: 800px;
}

/* =========================
   HEADER
========================= */

.header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(18px);
    background: rgba(9, 9, 11, 0.75);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.navbar {
    max-width: var(--container);
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: 0.3s ease;
}

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

.language-switcher {
    display: flex;
    gap: 10px;
}

.language-switcher button {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
}

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

.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 60px;
}

.hero-content {
    max-width: 900px;
    text-align: center;
}

.hero-badge {
    display: inline-block;

    margin-bottom: 24px;

    padding: 8px 16px;

    border: 1px solid var(--border);
    border-radius: 999px;

    background: color-mix(in srgb,
            var(--surface) 80%,
            transparent);

    color: var(--text-secondary);

    font-size: 0.9rem;
}

.hero h1 {
    font-size: clamp(2.8rem, 6vw, 4.8rem);

    background: linear-gradient(180deg,
            #ffffff 0%,
            #dbeafe 100%);

    -webkit-background-clip: text;

    -webkit-text-fill-color: transparent;

    max-width: 1000px;

    line-height: 1.1;

    margin: 0 auto 28px;

    font-weight: 800;

    letter-spacing: -2px;
}

.hero p {
    color: var(--text-secondary);

    font-size: 1.2rem;

    max-width: 700px;

    margin: auto;
}

.hero-actions {
    margin-top: 40px;

    display: flex;
    justify-content: center;
    gap: 16px;

    flex-wrap: wrap;
}

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

.btn-primary,
.btn-secondary {
    text-decoration: none;

    padding: 14px 26px;

    border-radius: 12px;

    transition: 0.3s ease;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* =========================
   METRICS
========================= */

.metrics {
    max-width: var(--container);

    margin: auto;

    display: grid;
    grid-template-columns: repeat(4, 1fr);

    gap: 24px;

    padding: 0 24px 120px;
}

.metric-card {
    background: var(--surface);

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

    padding: 32px;

    border-radius: 20px;

    text-align: center;
}

.metric-card h3 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.metric-card p {
    color: var(--text-secondary);
}

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

.cards-grid {
    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));

    gap: 24px;

    margin-top: 40px;
}

.card,
.project-card {
    background: var(--surface);

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

    border-radius: 20px;

    padding: 28px;

    transition: all .3s ease;
}

.card:hover,
.project-card:hover {
    transform: translateY(-6px);

    border-color: rgba(59, 130, 246, .35);

    background: var(--surface-hover);
}

.card h3,
.project-card h3 {
    margin-bottom: 12px;
}

.card p,
.project-card p {
    color: var(--text-secondary);
}

/* =========================
   TECH STACK
========================= */

.tech-stack {
    display: flex;
    flex-wrap: wrap;

    gap: 14px;

    margin-top: 40px;
}

.tech-stack span {
    padding: 10px 18px;

    background: var(--surface);

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

    border-radius: 999px;

    color: var(--text-secondary);
}

/* =========================
   TIMELINE
========================= */

.timeline {
    margin-top: 40px;

    border-left: 2px solid var(--border);

    padding-left: 32px;
}

.timeline-item {
    position: relative;

    margin-bottom: 50px;
}

.timeline-item::before {
    content: "";

    position: absolute;

    left: -41px;
    top: 8px;

    width: 14px;
    height: 14px;

    border-radius: 50%;

    background: var(--accent);
}

.timeline-item h3 {
    margin-bottom: 10px;
}

.timeline-item p {
    color: var(--text-secondary);
}

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

.contact-links {
    display: flex;
    gap: 20px;

    margin-top: 30px;

    flex-wrap: wrap;
}

.contact-links a {
    text-decoration: none;

    color: var(--accent);

    transition: 0.3s ease;
}

.contact-links a:hover {
    color: white;
}

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

.footer {
    border-top: 1px solid var(--border);

    text-align: center;

    padding: 50px 24px;

    color: var(--text-secondary);
}

.footer p:first-child {
    margin-bottom: 10px;
}

/* ========================= BACK TO TOP ========================= */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: #3b82f6;
    color: white;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

#backToTop:hover {
    transform: translateY(-3px);
}

#backToTop.show {
    opacity: 1;
    visibility: visible;
}

/* ========================= SECTION ANIMATION ========================= */
.section,
.metric-card,
.project-card,
.card {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s ease;
}

.show-element {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* ========================= ACTIVE NAV ========================= */
.nav-links a.active {
    color: #ffffff;
}

.nav-links a.active::after {
    content: "";
    display: block;
    margin-top: 6px;
    width: 100%;
    height: 2px;
    background: #3b82f6;
}

/* =========================
   THEME BUTTON
========================= */

.controls {

    display: flex;

    align-items: center;

    gap: 16px;
}

#theme-toggle {

    border: none;

    background: transparent;

    color: var(--text-primary);

    cursor: pointer;

    font-size: 1.2rem;

    transition: .3s ease;
}

#theme-toggle:hover {

    transform: rotate(20deg);
}

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

@media (max-width: 960px) {

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

    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .section {
        padding: 90px 24px;
    }
}

@media (max-width: 640px) {

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

    .hero {
        text-align: center;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section h2 {
        font-size: 2rem;
    }
}

.language-switcher button.active {
    transform: scale(1.15);
}

.language-switcher button {
    transition: all 0.3s ease;
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

.card:hover,
.project-card:hover {
    transform: translateY(-6px) scale(1.02);
}

@media (max-width:960px) {
    .menu-toggle {
        display: block;
    }

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