:root {
    --bg: #ffffff;
    --bg-alt: #f5f7fb;
    --text: #1c2333;
    --muted: #667085;
    --primary: #4f46e5;
    --primary-dark: #3d35c4;
    --border: #e4e7ee;
    --radius: 16px;
    --shadow: 0 8px 30px rgba(31, 41, 80, .08);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1320;
        --bg-alt: #151a2b;
        --text: #e8ebf5;
        --muted: #9aa3bb;
        --border: #262d45;
        --shadow: 0 8px 30px rgba(0, 0, 0, .35);
    }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
    font-family: 'Vazirmatn', Tahoma, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.9;
}
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; height: auto; }
.container { width: min(1100px, 92%); margin-inline: auto; }
.narrow { width: min(760px, 92%); }
.center { text-align: center; }
.muted { color: var(--muted); }

/* هدر */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--text); }
.menu { display: flex; align-items: center; gap: 22px; }
.menu a { color: var(--text); font-weight: 400; }
.menu a:hover { color: var(--primary); }
.menu-toggle { display: none; background: none; border: 0; font-size: 1.6rem; color: var(--text); cursor: pointer; }

/* دکمه */
.btn {
    display: inline-block; cursor: pointer; border: 2px solid var(--primary);
    background: var(--primary); color: #fff !important;
    padding: 10px 26px; border-radius: 999px; font: inherit; font-weight: 600;
    transition: transform .15s, background .15s;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--primary) !important; }
.btn-outline:hover { background: var(--primary); color: #fff !important; }
.btn-small { padding: 4px 18px; }

/* قهرمان */
.hero { padding: 80px 0 60px; background: linear-gradient(160deg, var(--bg-alt), var(--bg)); }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 40px; }
.eyebrow { color: var(--primary); font-weight: 600; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.4rem); font-weight: 800; line-height: 1.4; }
.hero h2 { font-size: 1.3rem; font-weight: 400; color: var(--muted); margin-bottom: 14px; }
.lead { font-size: 1.1rem; max-width: 520px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-photo { display: flex; justify-content: center; }
.hero-photo img { border-radius: 50%; box-shadow: var(--shadow); border: 6px solid var(--bg); }

/* آمار */
.stats { padding: 10px 0 30px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; }
.stat { background: var(--bg-alt); border-radius: var(--radius); padding: 20px; text-align: center; border: 1px solid var(--border); }
.stat strong { display: block; font-size: 2rem; color: var(--primary); line-height: 1.4; }
.stat span { color: var(--muted); }

/* بخش‌ها */
.section { padding: 70px 0; }
.section.alt { background: var(--bg-alt); }
.section-title { text-align: center; font-size: 1.9rem; margin-bottom: 34px; position: relative; }
.section-title::after { content: ''; display: block; width: 56px; height: 4px; border-radius: 4px; background: var(--primary); margin: 8px auto 0; }
.about-text { font-size: 1.1rem; text-align: justify; }
.about-meta { list-style: none; margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: center; }

/* کارت‌ها */
.grid { display: grid; gap: 22px; }
.cols-4 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.cols-3 { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.card {
    background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 26px; box-shadow: var(--shadow); transition: transform .2s;
}
.card:hover { transform: translateY(-4px); }
.card .icon { font-size: 2rem; }
.card h3 { margin: 8px 0; font-size: 1.1rem; }
.card p { color: var(--muted); }
.tag { display: inline-block; font-size: .8rem; background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary); padding: 0 12px; border-radius: 999px; }
.more { display: inline-block; margin-top: 10px; font-weight: 600; }
.project.hidden { display: none; }

/* فیلتر */
.filters { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 26px; }
.filter { font: inherit; cursor: pointer; background: var(--bg); color: var(--text); border: 1px solid var(--border); padding: 4px 18px; border-radius: 999px; }
.filter.active, .filter:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* مهارت */
.skill { margin-bottom: 20px; }
.skill-head { display: flex; justify-content: space-between; margin-bottom: 4px; font-weight: 600; }
.bar { height: 10px; background: var(--border); border-radius: 999px; overflow: hidden; }
.fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--primary), #8b5cf6); border-radius: 999px; transition: width 1.1s ease; }

/* فرم */
.form { display: grid; gap: 16px; margin-top: 24px; }
.form label { display: grid; gap: 6px; font-weight: 600; }
.form input, .form textarea {
    font: inherit; padding: 12px 14px; border-radius: 12px;
    border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.form input:focus, .form textarea:focus { outline: 2px solid var(--primary); border-color: transparent; }
.form .btn { justify-self: start; }
.hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }
.alert { margin-top: 20px; padding: 12px 16px; border-radius: 12px; font-weight: 600; }
.alert.ok { background: #e7f8ee; color: #136c3a; }
.alert.err { background: #fdeaea; color: #a12626; }

/* فوتر */
.site-footer { padding: 30px 0; text-align: center; border-top: 1px solid var(--border); color: var(--muted); }
.socials { display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: center; margin-bottom: 10px; }

/* ریسپانسیو */
@media (max-width: 800px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-photo { order: -1; }
    .hero-photo img { width: 220px; height: 220px; }
    .lead { margin-inline: auto; }
    .hero-actions { justify-content: center; }
    .menu-toggle { display: block; }
    .menu {
        display: none; position: absolute; top: 64px; inset-inline: 0;
        flex-direction: column; padding: 16px; gap: 14px;
        background: var(--bg); border-bottom: 1px solid var(--border);
    }
    .menu.open { display: flex; }
}