:root {
    --primary: #0f766e;
    --primary-light: #14b8a6;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-lighter: #94a3b8;
    --bg: #fff;
    --surface: #f8fafc;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-hover: 0 8px 25px rgba(0,0,0,.1);
    --radius: 12px;
    --radius-lg: 16px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --container: 1120px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); line-height: 1.6; background: var(--bg); }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.section { padding: 96px 0; }
.section--alt { background: var(--surface); }
.section-title { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; text-align: center; margin-bottom: 12px; }
.section-subtitle {
    font-size: clamp(.95rem, 2vw, 1.15rem); color: var(--text-muted); text-align: center;
    max-width: 720px; margin: 0 auto 48px; line-height: 1.7;
}

/* Scroll animation */
.animate-on-scroll {
    opacity: 0; transform: translateY(20px);
    transition: opacity .5s, transform .5s, border-color .2s, box-shadow .2s;
    transition-delay: calc(var(--i, 0) * 60ms);
}
.animate-on-scroll.visible { opacity: 1; transform: none; }

/* Shared interactive style */
.card, .safety-item {
    border: 1px solid var(--border); border-radius: var(--radius);
    transition: border-color .2s, box-shadow .2s;
}
.card:hover, .safety-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-hover); }

/* Nav */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-light);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { font-size: 1.35rem; font-weight: 700; color: var(--primary); }
.nav-menu { display: flex; list-style: none; gap: 8px; }
.nav-link {
    font-size: .9rem; font-weight: 500; color: var(--text-muted);
    padding: 8px 14px; border-radius: 8px; transition: color .2s, background .2s;
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-link.active { color: var(--primary); background: var(--surface); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* Hero */
.hero { padding: 140px 0 80px; background: var(--surface); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-label {
    display: inline-block; font-size: clamp(.7rem, 1.5vw, .85rem); font-weight: 600;
    color: var(--primary); letter-spacing: .08em; text-transform: uppercase; margin-bottom: 16px;
}
.hero-title {
    font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; color: var(--primary);
    line-height: 1.1; letter-spacing: -.03em; margin-bottom: 16px;
}
.hero-subtitle {
    font-size: clamp(.85rem, 1.8vw, 1rem); color: var(--text-muted);
    font-weight: 500; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 12px;
}
.hero-tagline { font-size: clamp(1rem, 2vw, 1.15rem); color: var(--text-muted); margin-bottom: 32px; line-height: 1.6; }
.btn { display: inline-block; font-weight: 600; font-size: 1rem; padding: 14px 32px; border-radius: var(--radius); transition: background .2s, box-shadow .2s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-hover); }
.hero-image { display: flex; justify-content: center; }
.hero-image img { max-width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-hover); }

/* About */
.about-text { font-size: clamp(.95rem, 1.8vw, 1.1rem); line-height: 1.8; max-width: 800px; margin: 0 auto 20px; text-align: center; }
.highlight-box {
    display: flex; align-items: flex-start; gap: 16px; max-width: 800px; margin: 32px auto 0;
    padding: 24px 28px; background: var(--surface); border: 1px solid var(--border);
    border-left: 4px solid var(--primary); border-radius: 0 var(--radius) var(--radius) 0;
}
.highlight-icon { color: var(--accent); flex-shrink: 0; }
.highlight-box p { font-size: .95rem; line-height: 1.75; color: var(--text-muted); }

/* Purpose Cards */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card { padding: 32px 24px; text-align: center; border-radius: var(--radius-lg); }
.card-icon {
    width: 48px; height: 48px; margin: 0 auto 16px; display: flex; align-items: center;
    justify-content: center; border-radius: 50%; background: var(--surface);
    color: var(--primary); border: 1px solid var(--border);
}
.card-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.card-text { font-size: .9rem; color: var(--text-muted); line-height: 1.65; }

/* Safety */
.safety-list { display: flex; flex-direction: column; gap: 16px; max-width: 800px; margin: 0 auto; }
.safety-item { display: flex; align-items: flex-start; gap: 16px; padding: 20px 24px; }
.safety-icon {
    width: 40px; height: 40px; flex-shrink: 0; display: flex; align-items: center;
    justify-content: center; border-radius: 50%; background: var(--surface);
    color: var(--primary); border: 1px solid var(--border);
}
.safety-name { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.safety-desc { font-size: .9rem; color: var(--text-muted); line-height: 1.6; }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 800px; margin: 0 auto; }
.tag {
    padding: 8px 18px; font-size: .88rem; font-weight: 500; color: var(--text);
    background: var(--bg); border: 1px solid var(--border); border-radius: 100px;
    transition: border-color .2s, color .2s; cursor: default;
}
.tag:hover { border-color: var(--primary-light); color: var(--primary); }
.tags-compact { display: flex; flex-wrap: wrap; gap: 8px; }
.tags-compact .tag { padding: 6px 14px; font-size: .85rem; }

/* Accordion */
.accordion, .programs-accordion { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.accordion details, .programs-accordion details { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.accordion details[open], .programs-accordion details[open] { border-color: var(--primary-light); }
.accordion summary, .programs-accordion summary {
    display: flex; align-items: center; gap: 12px; padding: 16px 20px;
    font-size: .95rem; font-weight: 600; cursor: pointer; list-style: none;
    user-select: none; transition: background .2s;
}
.accordion summary::-webkit-details-marker, .programs-accordion summary::-webkit-details-marker { display: none; }
.accordion summary:hover, .programs-accordion summary:hover { background: var(--surface); }
.accordion summary svg:first-child, .programs-accordion summary svg:first-child { color: var(--primary); flex-shrink: 0; }
.accordion summary .chevron, .programs-accordion summary .chevron { margin-left: auto; color: var(--text-lighter); transition: transform .3s; }
.accordion details[open] summary .chevron, .programs-accordion details[open] summary .chevron { transform: rotate(180deg); }
.accordion-body, .programs-accordion .accordion-body { padding: 0 20px 16px 52px; font-size: .9rem; color: var(--text-muted); line-height: 1.65; }

/* Details */
.details-block { max-width: 720px; margin: 0 auto 40px; padding-bottom: 40px; border-bottom: 1px solid var(--border); }
.details-block:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.details-heading { display: flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 600; margin-bottom: 16px; }
.details-heading svg { color: var(--primary); }
.details-block p { font-size: .95rem; color: var(--text-muted); line-height: 1.7; }
.details-block strong { color: var(--primary); }
.details-intro { margin-bottom: 16px; }
.details-list { list-style: none; counter-reset: item; }
.details-list li { counter-increment: item; padding: 10px 0 10px 36px; position: relative; font-size: .95rem; border-bottom: 1px solid var(--border-light); }
.details-list li:last-child { border-bottom: none; }
.details-list li::before {
    content: counter(item); position: absolute; left: 0; top: 10px; width: 24px; height: 24px;
    border-radius: 50%; background: var(--surface); border: 1px solid var(--border);
    font-size: .8rem; font-weight: 600; color: var(--primary); display: flex; align-items: center; justify-content: center;
}

/* Specs */
.specs-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.spec-card { padding: 20px 16px; border: 1px solid var(--border); border-radius: var(--radius); text-align: center; }
.spec-icon { color: var(--primary); margin-bottom: 8px; }
.spec-label { display: block; font-size: .8rem; color: var(--text-lighter); text-transform: uppercase; letter-spacing: .04em; margin-bottom: 4px; }
.spec-value { font-size: .95rem; font-weight: 600; }

/* Electrodes */
.electrodes-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.electrode-item { display: flex; align-items: flex-start; gap: 12px; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); color: var(--primary); }
.electrode-item strong { display: block; font-size: .95rem; color: var(--text); margin-bottom: 2px; }
.electrode-item p { font-size: .85rem; }

/* Warning */
.details-block--warn {
    background: var(--bg); padding: 24px 28px; border-radius: var(--radius);
    border: 1px solid var(--accent); border-left: 4px solid var(--accent);
    max-width: 720px; margin-left: auto; margin-right: auto; margin-bottom: 0;
}

/* Contact */
.contact-body { text-align: center; padding: 32px 0; }
.contact-text { font-size: 1.05rem; color: var(--text-muted); margin-bottom: 24px; }
.contact-phone {
    display: inline-flex; align-items: center; gap: 10px; font-size: clamp(1.3rem, 3.5vw, 1.8rem);
    font-weight: 700; color: var(--accent); padding: 20px 40px; border: 2px solid var(--accent);
    border-radius: var(--radius-lg); transition: background .2s, color .2s;
}
.contact-phone:hover { background: var(--accent); color: #fff; }

/* Footer */
.footer { background: var(--text); padding: 40px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-logo { font-size: 1.1rem; font-weight: 700; color: #fff; }
.footer-copy { font-size: .85rem; color: var(--text-lighter); }

/* Steps / How to use */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; max-width: 900px; margin: 0 auto; }
.step-card {
    padding: 40px 24px; text-align: center;
    border: 1px solid var(--border); border-radius: var(--radius-lg);
    position: relative; background: var(--bg);
}
.step-number {
    position: absolute; top: -8px; left: -8px;
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--primary); color: #fff;
    font-size: 1.2rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}
.step-icon { color: var(--primary); margin-bottom: 16px; }
.step-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.step-text { font-size: .9rem; color: var(--text-muted); line-height: 1.6; }
.howto-note {
    display: flex; align-items: center; justify-content: center;
    gap: 12px; padding: 20px 24px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); max-width: 720px; margin: 32px auto 0;
}
.howto-note svg { color: var(--primary); flex-shrink: 0; }

/* Certificates */
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 900px; margin: 0 auto; }
.cert-card { padding: 32px 24px; text-align: center; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); }
.cert-icon { color: var(--primary); margin-bottom: 16px; }
.cert-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 10px; }
.cert-text { font-size: .9rem; color: var(--text-muted); line-height: 1.6; }

/* Doctor review */
.doctor-review {
    max-width: 720px; margin: 0 auto 48px; padding: 32px;
    background: var(--surface); border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    display: flex; align-items: flex-start; gap: 20px;
}
.doctor-avatar {
    width: 64px; height: 64px; flex-shrink: 0;
    border-radius: 50%; background: var(--bg);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary); border: 1px solid var(--border);
}
.doctor-content blockquote { font-size: 1.05rem; font-style: italic; color: var(--text-muted); line-height: 1.75; margin-bottom: 16px; }
.doctor-content blockquote::before { content: '\201C'; font-size: 3rem; color: var(--primary-light); line-height: 0; display: block; margin-bottom: 8px; }
.doctor-info { display: flex; flex-direction: column; gap: 2px; }
.doctor-info strong { font-size: .95rem; color: var(--text); }
.doctor-info span { font-size: .85rem; color: var(--text-lighter); }

/* Reviews */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-card { padding: 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.review-avatar {
    width: 48px; height: 48px; flex-shrink: 0;
    border-radius: 50%; background: var(--surface);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary); border: 1px solid var(--border);
}
.review-author strong { display: block; font-size: .95rem; color: var(--text); }
.review-author span { font-size: .85rem; color: var(--text-lighter); }
.review-text { font-size: .9rem; color: var(--text-muted); line-height: 1.65; margin-bottom: 16px; }
.review-result { display: flex; align-items: center; gap: 6px; font-size: .85rem; color: var(--primary); }
.review-result svg { color: var(--primary-light); }

/* Contraindications */
.contraindications-box {
    display: flex; align-items: flex-start; gap: 24px;
    max-width: 720px; margin: 0 auto; padding: 32px;
    background: var(--bg); border: 1px solid var(--accent);
    border-radius: var(--radius-lg);
}
.contraindications-icon {
    width: 64px; height: 64px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%; background: rgba(245, 158, 11, .1);
    color: var(--accent);
}
.contraindications-content h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 12px; }
.contraindications-content h3:not(:first-child) { margin-top: 16px; }
.contraindications-content ul { list-style: none; }
.contraindications-content li {
    position: relative; padding: 6px 0 6px 24px;
    font-size: .95rem; color: var(--text-muted);
    border-bottom: 1px solid var(--border-light);
}
.contraindications-content li:last-child { border-bottom: none; }
.contraindications-content li::before {
    content: ''; position: absolute; left: 0; top: 14px;
    width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
}
.contraindications-note {
    margin-top: 16px; padding: 12px 16px;
    background: var(--surface); border-radius: 8px;
    font-size: .85rem; color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-menu {
        position: fixed; top: 64px; left: 0; right: 0; background: var(--bg);
        flex-direction: column; padding: 16px 24px; gap: 4px; border-bottom: 1px solid var(--border);
        transform: translateY(-120%); opacity: 0; transition: transform .3s, opacity .3s;
    }
    .nav-menu.active { transform: translateY(0); opacity: 1; }
    .hero { padding: 110px 0 60px; }
    .hero-inner { grid-template-columns: 1fr; gap: 40px; text-align: center; }
    .hero-image { order: -1; }
    .hero-image img { max-width: 280px; margin: 0 auto; }
    .section { padding: 64px 0; }
    .grid-4, .specs-row, .electrodes-row, .steps-grid, .cert-grid, .reviews-grid { grid-template-columns: 1fr; }
    .highlight-box, .contraindications-box { flex-direction: column; text-align: center; align-items: center; }
    .accordion summary { font-size: .9rem; padding: 14px 16px; }
    .accordion-body { padding: 0 16px 14px 48px; }
    .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}