:root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-primary: #0d9488;
    --color-primary-dark: #0f766e;
    --color-primary-light: #ccfbf1;
    --color-accent: #38bdf8;
    --color-border: #e2e8f0;
    --color-success: #059669;
    --color-error: #dc2626;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --header-h: 72px;
    --max-w: 1120px;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--color-primary-dark);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(100% - 2rem, var(--max-w));
    margin-inline: auto;
}

.section {
    padding: 4.5rem 0;
}

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

.section__title {
    margin: 0 0 0.75rem;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section__lead {
    margin: 0 0 2.5rem;
    max-width: 42rem;
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.header--scrolled {
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 1rem;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    letter-spacing: -0.03em;
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
}

.nav {
    display: none;
    gap: 1.5rem;
}

.nav a {
    color: var(--color-text);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
}

.nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.header__actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 900px) {
    .nav {
        display: flex;
    }

    .nav-toggle {
        display: none;
    }
}

.nav-mobile {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    padding: 1rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    gap: 0.5rem;
}

.nav-mobile.is-open {
    display: flex;
}

.nav-mobile a {
    padding: 0.75rem 1rem;
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--radius);
    text-decoration: none;
}

.nav-mobile a:hover {
    background: var(--color-primary-light);
    text-decoration: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.35rem;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.2;
    border-radius: 999px;
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn--primary {
    background: var(--color-primary);
    color: #fff;
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
}

.btn--outline {
    background: transparent;
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}

.btn--outline:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.btn--ghost {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn--ghost:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.btn--sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn--block {
    width: 100%;
}

/* Hero */
.hero {
    padding: calc(var(--header-h) + 3rem) 0 4rem;
    background: linear-gradient(165deg, #f0fdfa 0%, #f8fafc 45%, #e0f2fe 100%);
}

.hero__grid {
    display: grid;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 900px) {
    .hero__grid {
        grid-template-columns: 1fr 1fr;
    }
}

.hero__badge {
    display: inline-block;
    margin-bottom: 1rem;
    padding: 0.35rem 0.85rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    background: var(--color-primary-light);
    border-radius: 999px;
}

.hero__title {
    margin: 0 0 1rem;
    font-size: clamp(1.85rem, 5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.hero__subtitle {
    margin: 0 0 1.5rem;
    font-size: 1.15rem;
    color: var(--color-text-muted);
}

.hero__trust {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    margin-bottom: 2rem;
    padding: 0;
    list-style: none;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.hero__trust li::before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: 700;
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero__diagram {
    padding: 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

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

.flow__item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--color-bg);
    border-radius: var(--radius);
    font-weight: 600;
}

.flow__icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-radius: 10px;
    font-size: 1.25rem;
}

.flow__arrow {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.25rem;
}

/* Cards grid */
.cards {
    display: grid;
    gap: 1.25rem;
    align-items: stretch;
}

@media (min-width: 640px) {
    .cards--2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .cards--3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .cards--4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .cards--4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

.card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.card__label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
}

.card__title {
    margin: 0 0 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
}

.card__text {
    margin: 0;
    flex: 1;
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.card__link {
    margin-top: auto;
    padding-top: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Integrations */
.integration-note {
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;
    background: var(--color-primary-light);
    border-radius: var(--radius);
    font-size: 0.95rem;
    color: var(--color-primary-dark);
}

/* Timeline */
.timeline {
    display: grid;
    gap: 1rem;
    counter-reset: step;
}

@media (min-width: 768px) {
    .timeline {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .timeline {
        grid-template-columns: repeat(3, 1fr);
    }
}

.timeline__item {
    position: relative;
    padding: 1.25rem 1.25rem 1.25rem 3.5rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    counter-increment: step;
}

.timeline__item::before {
    content: counter(step);
    position: absolute;
    left: 1rem;
    top: 1.25rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 800;
    color: #fff;
    background: var(--color-primary);
    border-radius: 50%;
}

.timeline__title {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    font-weight: 700;
}

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

/* Stack chips */
.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 2rem;
}

.chip {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
}

/* Pricing */
.pricing {
    display: grid;
    gap: 1.25rem;
}

@media (min-width: 768px) {
    .pricing {
        grid-template-columns: repeat(3, 1fr);
        align-items: stretch;
    }
}

.price-card {
    display: flex;
    flex-direction: column;
    padding: 1.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.price-card--featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: scale(1.02);
}

.price-card__badge {
    display: none;
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-primary);
}

.price-card--featured .price-card__badge {
    display: block;
}

.price-card__title {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.price-card__price {
    margin: 0 0 1rem;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary-dark);
}

.price-card__price span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.price-card__features {
    flex: 1;
    margin: 0 0 1.5rem;
    padding: 0;
    list-style: none;
}

.price-card__features li {
    position: relative;
    padding-left: 1.35rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.price-card__features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.pricing__note {
    margin-top: 2rem;
    padding: 1.25rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px dashed var(--color-border);
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* FAQ */
.faq {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.faq__item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq__question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.1rem 1.25rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    color: var(--color-text);
    background: transparent;
    border: none;
    cursor: pointer;
}

.faq__question:hover {
    color: var(--color-primary-dark);
}

.faq__icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    position: relative;
}

.faq__icon::before,
.faq__icon::after {
    content: "";
    position: absolute;
    background: var(--color-primary);
    border-radius: 2px;
    transition: transform 0.2s;
}

.faq__icon::before {
    top: 11px;
    left: 5px;
    width: 14px;
    height: 2px;
}

.faq__icon::after {
    top: 5px;
    left: 11px;
    width: 2px;
    height: 14px;
}

.faq__item.is-open .faq__icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

.faq__answer {
    display: none;
    padding: 0 1.25rem 1.25rem;
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.faq__item.is-open .faq__answer {
    display: block;
}

/* About */
.about {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .about {
        grid-template-columns: auto 1fr;
        align-items: start;
    }
}

.about__avatar {
    width: 140px;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    background: linear-gradient(135deg, var(--color-primary-light), #e0f2fe);
    border-radius: 50%;
    border: 3px solid var(--color-surface);
    box-shadow: var(--shadow-md);
}

.about__chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.about__text p {
    margin: 0 0 1rem;
}

.about__principles {
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

.about__principles li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
}

.about__principles li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* Contact */
.contact__grid {
    display: block;
    gap: 2rem;
}

@media (min-width: 900px) {
    .contact__grid {
        grid-template-columns: 1fr 1.1fr;
    }
}

.contact__info {
    padding: 1.5rem;
    margin-bottom: 1rem;
    text-align: center;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
}

.contact__info h3 {
    margin: 0 0 0.75rem;
    font-size: 1.15rem;
}

.contact__info p {
    margin: 0 0 1rem;
    color: var(--color-primary-dark);
}

.form {
    padding: 1.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form__group {
    margin-bottom: 1.25rem;
}

.form__label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.form__label--required::after {
    content: " *";
    color: var(--color-error);
}

.form__input,
.form__select,
.form__textarea {
    width: 100%;
    padding: 0.7rem 0.9rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.form__input.is-invalid,
.form__select.is-invalid,
.form__textarea.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

.form__textarea {
    min-height: 120px;
    resize: vertical;
}

.form__fieldset {
  margin: 0;
  padding: 0;
  border: none;
}

.form__fieldset .form__label {
  margin-bottom: 0.4rem;
}

.form__checkboxes {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form__checkboxes.is-invalid {
  padding: 0.75rem;
  border-radius: 8px;
  outline: 2px solid var(--color-error);
  outline-offset: 2px;
}

.form__checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.95rem;
    cursor: pointer;
}

.form__checkbox input {
    margin-top: 0.25rem;
    accent-color: var(--color-primary);
}

.form__status {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    display: none;
}

.form__status.is-visible {
    display: block;
}

.form__status--success {
    background: #d1fae5;
    color: var(--color-success);
}

.form__status--error {
    background: #fee2e2;
    color: var(--color-error);
}

.form__alt {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Footer */
.footer {
    padding: 2.5rem 0;
    background: #0f172a;
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer__inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .footer__inner {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.footer a {
    color: #e2e8f0;
}

.footer__brand {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
}

.footer__links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}