:root {
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-alt: #f9fafb;
    --color-primary: #16a34a;
    --color-primary-soft: rgba(22, 163, 74, 0.12);
    --color-accent: #15803d;
    --color-text: #0f172a;
    --color-muted: #64748b;
    --color-border: #e2e8f0;
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.12);
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-pill: 999px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

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

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5rem 0 4rem;
}

.section-inner {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.section-header {
    max-width: 720px;
}

.section-header h2 {
    font-size: 2rem;
    margin: 0 0 0.75rem;
}

.section-header p {
    margin: 0;
    color: var(--color-muted);
}

/* Header */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.05);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.25rem;
}

.logo {
    font-weight: 700;
    letter-spacing: 0.04em;
    font-size: 1.1rem;
}

.logo span {
    font-weight: 500;
    color: var(--color-primary);
    margin-left: 0.4rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list a {
    font-size: 0.95rem;
    color: var(--color-muted);
}

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

.nav-cta {
    margin-left: 0.5rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: 0.4rem;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 999px;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.4rem;
    border-radius: var(--radius-pill);
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.18s ease-out;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #16a34a, #15803d);
    border-color: #15803d;
    color: white;
    box-shadow: 0 12px 30px rgba(22, 163, 74, 0.35);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 40px rgba(22, 163, 74, 0.5);
}

.btn-secondary {
    background: transparent;
    border-color: rgba(148, 163, 184, 0.7);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: rgba(209, 250, 229, 0.9);
}

/* Hero */

.hero {
    padding: 5.5rem 0 4.5rem;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.3fr);
    gap: 2.4rem;
    align-items: stretch;
}

.hero-content h1 {
    font-size: clamp(2.1rem, 3vw, 2.7rem);
    line-height: 1.2;
    margin: 0 0 1rem;
}

.hero-content p {
    margin: 0 0 1.2rem;
    color: var(--color-muted);
}

.hero-highlights {
    list-style: none;
    margin: 0 0 1.6rem;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero-highlights li {
    font-size: 0.9rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.3);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.hero-card {
    background: radial-gradient(circle at top left, rgba(22, 163, 74, 0.18), transparent 55%),
        linear-gradient(145deg, #ffffff, #f9fafb);
    border-radius: 24px;
    padding: 1.75rem 1.8rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
}

.hero-card h2 {
    margin: 0 0 1rem;
    font-size: 1.15rem;
}

.hero-card ol {
    margin: 0 0 1.1rem;
    padding-left: 1.1rem;
    color: var(--color-muted);
    font-size: 0.95rem;
}

.hero-card .note {
    margin: 0;
    font-size: 0.8rem;
    color: var(--color-muted);
}

.application-card {
    background: var(--color-surface);
    border-radius: 24px;
    padding: 1.8rem 1.9rem 2rem;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
    max-width: 520px;
    margin-left: auto;
    position: relative;
}

.application-card h2 {
    margin: 0 0 1.1rem;
    font-size: 1.25rem;
}

.app-step {
    display: none;
}

.app-step.active {
    display: block;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.slider-row input[type="range"] {
    flex: 1;
}

.amount-display {
    min-width: 90px;
    text-align: center;
    font-weight: 600;
    border-radius: var(--radius-pill);
    padding: 0.25rem 0.8rem;
    background: rgba(22, 163, 74, 0.08);
    border: 1px solid rgba(22, 163, 74, 0.4);
}

.app-note {
    font-size: 0.8rem;
    color: var(--color-muted);
    margin: 0 0 1rem;
}

.full-width {
    width: 100%;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 0.75rem;
    margin-bottom: 1.1rem;
}

.form-grid .field-full {
    grid-column: 1 / -1;
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.85rem;
}

.field-group label {
    font-weight: 500;
}

.field-group input[type="text"],
.field-group input[type="tel"] {
    border-radius: 999px;
    border: 1px solid var(--color-border);
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
    outline: none;
}

.field-group input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px rgba(22, 163, 74, 0.3);
}

.upload-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.1rem;
}

.upload-group input[type="file"] {
    font-size: 0.85rem;
}

.app-helper {
    font-size: 0.8rem;
    color: var(--color-muted);
}

.app-loading {
    position: absolute;
    inset: 0.9rem 1rem 1.1rem;
    background: rgba(241, 245, 249, 0.9);
    backdrop-filter: blur(4px);
    border-radius: 20px;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 5;
}

.app-loading.visible {
    display: flex;
}

.app-loading-inner {
    text-align: center;
    max-width: 260px;
    color: var(--color-text);
}

.app-loading-inner p {
    margin-top: 0.8rem;
    font-size: 0.9rem;
}

.app-loading-spinner {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid rgba(22, 163, 74, 0.2);
    border-top-color: var(--color-primary);
    animation: appSpin 0.9s linear infinite;
    margin: 0 auto;
}

@keyframes appSpin {
    to {
        transform: rotate(360deg);
    }
}

/* About */

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.about-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 1.5rem 1.4rem;
    border: 1px solid var(--color-border);
}

.about-item h3 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
}

.about-item p {
    margin: 0;
    font-size: 0.92rem;
    color: var(--color-muted);
}

/* Products */

.products {
    background: var(--color-surface-alt);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.7rem 1.6rem;
    border: 1px solid rgba(148, 163, 184, 0.28);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.7);
}

.card h3 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
}

.card p {
    margin: 0 0 0.9rem;
    font-size: 0.92rem;
    color: var(--color-muted);
}

.card ul {
    margin: 0;
    padding-left: 1.1rem;
    font-size: 0.9rem;
    color: var(--color-text);
}

/* How it works */

.how-it-works {
    background: var(--color-bg);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.4rem;
}

.step {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 1.4rem 1.3rem 1.5rem;
    border: 1px solid var(--color-border);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.8rem;
    height: 1.8rem;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.15);
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
}

.step h3 {
    margin: 0 0 0.4rem;
    font-size: 1rem;
}

.step p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.section-cta {
    margin-top: 1.5rem;
}

/* FAQ */

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

details {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: 0.8rem 1rem;
}

details[open] {
    background: var(--color-surface-alt);
}

summary {
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    list-style: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "+";
    float: right;
    color: var(--color-muted);
}

details[open] summary::after {
    content: "–";
}

details p {
    margin: 0.6rem 0 0;
    font-size: 0.9rem;
    color: var(--color-muted);
}

/* Contact */

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.3rem;
}

.contact-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 1.2rem 1.1rem;
    border: 1px solid var(--color-border);
}

.contact-item h3 {
    margin: 0 0 0.4rem;
    font-size: 0.98rem;
}

.contact-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-muted);
}

.contact-item a {
    color: var(--color-text);
}

.contact-note {
    margin-top: 1.5rem;
    padding: 1.2rem 1.1rem;
    border-radius: var(--radius-md);
    border: 1px dashed rgba(148, 163, 184, 0.45);
    background: rgba(15, 23, 42, 0.7);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
}

.contact-note p {
    margin: 0;
    font-size: 0.9rem;
}

/* Footer */

.site-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    padding: 1.6rem 0 2rem;
    background: #0f172a;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.footer-note {
    max-width: 720px;
}

/* Responsive */

@media (max-width: 960px) {
    .hero-inner {
        grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.1fr);
    }

    .about-grid,
    .card-grid,
    .steps,
    .contact-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: auto;
        padding: 0.65rem 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        inset: 3.4rem 0 auto;
        background: linear-gradient(to bottom, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.96));
        border-bottom: 1px solid rgba(148, 163, 184, 0.2);
        padding: 0.75rem 1.5rem 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.18s ease-out;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }

    .nav-cta {
        width: 100%;
        justify-content: center;
    }

    .hero {
        padding-top: 4.5rem;
    }

    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
        gap: 1.8rem;
    }

    .application-card {
        order: -1;
        max-width: 100%;
    }

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

    .contact-note {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3.5rem 0 3rem;
    }

    .hero-inner {
        gap: 1.6rem;
    }

    .hero-content h1 {
        font-size: 1.7rem;
    }
}