:root {
    --bg: #0b1020;
    --bg-alt: #111629;
    --card-bg: #161b2e;
    --accent: #3abff8;
    --accent-soft: rgba(58, 191, 248, 0.1);
    --accent-strong: #22c55e;
    --accent-warning: #f97316;
    --accent-danger: #ef4444;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --radius-lg: 14px;
    --radius-md: 10px;
    --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.35);
    --transition-fast: 0.18s ease-out;
    --max-width: 1120px;
    --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html, body {
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: radial-gradient(circle at top left, #1f2937 0, #020617 45%, #020617 100%);
    color: var(--text);
    line-height: 1.6;
}

/* Layout helpers */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
}

.logo-main {
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: 0.03em;
}

.logo-main span {
    color: var(--accent);
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--muted);
    display: block;
    margin-top: 2px;
}

.nav a {
    margin-left: 18px;
    font-size: 0.92rem;
    color: var(--muted);
    text-decoration: none;
    padding: 6px 8px;
    border-radius: 999px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav a:hover {
    color: #f9fafb;
    background-color: rgba(148, 163, 184, 0.13);
}

/* Hero */

.hero {
    padding: 40px 0 32px;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 32px;
    align-items: center;
}

.hero h1 {
    font-size: 2.4rem;
    line-height: 1.15;
    margin-bottom: 12px;
}

.hero p {
    color: var(--muted);
    max-width: 640px;
}

.hero-note {
    margin-top: 6px;
    font-size: 0.9rem;
}

.hero-highlight {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(34, 197, 94, 0.05));
    border-radius: var(--radius-lg);
    padding: 18px 18px 16px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    box-shadow: var(--shadow-soft);
}

.hero-highlight h2 {
    font-size: 1.1rem;
    margin-top: 0;
}

.hero-highlight ul {
    padding-left: 16px;
    margin: 10px 0;
}

.hero-highlight li {
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.disclaimer-small {
    font-size: 0.78rem;
    color: var(--muted);
    margin-top: 8px;
}

/* Buttons */

.btn-primary,
.btn-secondary,
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 16px;
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.94rem;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #38bdf8);
    color: #020617;
    box-shadow: 0 14px 35px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 40px rgba(56, 189, 248, 0.45);
}

.btn-secondary {
    background-color: rgba(15, 23, 42, 0.9);
    border-color: rgba(148, 163, 184, 0.3);
    color: var(--muted);
}

.btn-secondary:hover {
    background-color: rgba(30, 41, 59, 0.95);
    color: #e5e7eb;
}

.btn-outline {
    border-color: rgba(148, 163, 184, 0.5);
    color: var(--text);
    background-color: transparent;
}

.btn-outline:hover {
    border-color: var(--accent);
    background-color: rgba(15, 23, 42, 0.9);
}

/* Sections */

.section {
    padding: 32px 0 28px;
}

.section-alt {
    background: radial-gradient(circle at top right, rgba(15, 118, 110, 0.18), rgba(15, 23, 42, 0.98));
}

.section-title {
    font-size: 1.6rem;
    margin: 0 0 4px;
}

.section-intro {
    color: var(--muted);
    max-width: 720px;
    margin-bottom: 20px;
}

/* Cards & tool layout */

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 18px 18px 16px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    box-shadow: var(--shadow-soft);
}

.tool-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 20px;
    align-items: flex-start;
}

/* Form */

.field-label {
    display: block;
    margin-top: 10px;
    margin-bottom: 4px;
    font-size: 0.9rem;
}

select,
input[type="text"],
input[type="number"],
textarea {
    width: 100%;
    padding: 7px 9px;
    border-radius: 8px;
    border: 1px solid rgba(148, 163, 184, 0.4);
    background-color: rgba(15, 23, 42, 0.95);
    color: var(--text);
    font-size: 0.92rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

select:focus,
input:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    margin: 6px 0 2px;
}

.checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--muted);
}

.checkbox-item input {
    margin-top: 2px;
}

.hint {
    font-size: 0.82rem;
    color: var(--muted);
    margin-top: 0;
}

.form-actions {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* Results card */

.results-card h3 {
    margin-top: 0;
    margin-bottom: 8px;
}

.placeholder-text {
    font-size: 0.9rem;
    color: var(--muted);
}

.bsl-summary {
    padding: 10px;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.9);
    border: 1px dashed rgba(148, 163, 184, 0.5);
    margin-bottom: 10px;
}

.bsl-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.bsl-1 {
    background-color: rgba(34, 197, 94, 0.16);
    color: #bbf7d0;
    border: 1px solid rgba(34, 197, 94, 0.7);
}

.bsl-2 {
    background-color: rgba(250, 204, 21, 0.16);
    color: #fef9c3;
    border: 1px solid rgba(250, 204, 21, 0.7);
}

.bsl-3 {
    background-color: rgba(249, 115, 22, 0.16);
    color: #fed7aa;
    border: 1px solid rgba(249, 115, 22, 0.7);
}

.bsl-4 {
    background-color: rgba(239, 68, 68, 0.18);
    color: #fee2e2;
    border: 1px solid rgba(239, 68, 68, 0.8);
}

.ppe-list,
.controls-list {
    margin-top: 10px;
}

.ppe-list ul,
.controls-list ul {
    margin: 6px 0 0;
    padding-left: 18px;
}

.ppe-list li,
.controls-list li {
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.hidden {
    display: none;
}

.warning-box {
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: 10px;
    background-color: rgba(239, 68, 68, 0.14);
    border: 1px solid rgba(239, 68, 68, 0.7);
    font-size: 0.86rem;
}

.note-box {
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    background-color: rgba(56, 189, 248, 0.06);
    border: 1px dashed rgba(56, 189, 248, 0.5);
    font-size: 0.85rem;
    color: var(--muted);
}

/* Affiliate grid */

.affiliate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 16px;
}

.affiliate-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 14px 14px 14px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.affiliate-card h3 {
    margin-top: 0;
    margin-bottom: 4px;
    font-size: 1.05rem;
}

.affiliate-card p {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 6px;
}

.bullet-list {
    padding-left: 16px;
    margin: 4px 0 10px;
    color: var(--muted);
    font-size: 0.86rem;
}

.bullet-list li {
    margin-bottom: 2px;
}

/* FAQ */

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.faq-item {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 14px;
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: 4px;
    font-size: 1rem;
}

.faq-item p {
    font-size: 0.9rem;
    color: var(--muted);
}

/* About */

.about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 18px;
}

.about-box {
    background-color: rgba(15, 23, 42, 0.94);
    border-radius: var(--radius-lg);
    padding: 14px;
    border: 1px solid rgba(148, 163, 184, 0.35);
}

/* Footer */

.site-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.25);
    padding: 10px 0 14px;
    background-color: #020617;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.site-footer p {
    margin: 0;
    font-size: 0.82rem;
    color: var(--muted);
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    margin: 0 4px;
    font-size: 0.82rem;
}

.footer-links a:hover {
    color: var(--accent);
}

/* Responsive */

@media (max-width: 900px) {
    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-highlight {
        order: -1;
    }

    .tool-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .about-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .nav a {
        margin-left: 10px;
    }
}

@media (max-width: 600px) {
    .hero {
        padding-top: 28px;
    }

    .hero h1 {
        font-size: 1.85rem;
    }

    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .nav {
        display: flex;
        flex-wrap: wrap;
    }
}