:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-alt: #f9fafb;
    --text: #17212b;
    --muted: #667585;
    --border: #d8dee6;
    --border-strong: #c8d0da;
    --accent-border: #CFE6FF;
    --accent-gradient: #F3F8FF;
    --accent: #0074D7;
    --accent-hover: #0062B8;
    --accent-soft: #E8F3FF;
    --success-bg: #eaf7ea;
    --success-border: #9ed39e;
    --success-text: #1f5f1f;
    --error-bg: #fdeaea;
    --error-border: #e2a2a2;
    --error-text: #922020;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04);
    --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.06);
    --container: 1180px;
}

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

html {
    height: 100%;
}
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    font-family: Inter, "Segoe UI", Arial, sans-serif;
}

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

.site-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.site-main {
    flex: 1 0 auto;
    padding: 40px 0 72px;
}

.container {
    width: min(var(--container), calc(100% - 32px));
    margin: 0 auto;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(246, 247, 249, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(216, 222, 230, 0.9);
}

.header-inner {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.logo {
    display: flex;
    align-items: center;
}
.logo-image {
    height: 46px;
    width: auto;
    display: block;
}
@media (max-width: 768px) {

    .logo-image {
        height: 38px;
    }
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}
.main-nav a {
    padding: 11px 16px;
    border: 1px solid transparent;
    border-radius: 999px;
    color: var(--text);
    font-weight: 600;
    transition: 0.18s ease;
}
.main-nav a:hover {
    background: var(--surface);
    border-color: var(--border);
}
.main-nav a.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.menu-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface);
    cursor: pointer;
    padding: 0;
}
.menu-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    margin: 4px auto;
    background: var(--text);
    border-radius: 999px;
}

/* Hero */
.hero-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 28px;
    box-shadow: var(--shadow-sm);
    padding: 56px;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    gap: 28px;
    align-items: center;
}
.hero-title {
    margin: 0 0 14px;
    font-size: clamp(1.8rem, 3vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}
.hero-subtitle {
    color: var(--muted);
    max-width: 680px;
}
.hero-card h1 {
    margin: 0 0 16px;
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
}
.hero-card p {
    margin: 0;
    max-width: 700px;
    color: var(--muted);
    font-size: 1.08rem;
}
.hero-actions {
    margin-top: 28px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}
.hero-side {
    background: linear-gradient(180deg, var(--accent-gradient) 0%, #ffffff 100%);
    border: 1px solid var(--accent-border);
    border-radius: 24px;
    padding: 28px;
}
.hero-side h2 {
    margin: 0 0 14px;
    font-size: 1.1rem;
}

.tech-list,
.meta-list {
    gap: 10px;
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.chip {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--surface);
    color: #415161;
    font-size: 0.95rem;
    font-weight: 600;
}

.page-title {
    margin: 0 0 20px;
    font-weight: 800;
    line-height: 1.15;
    color: var(--text);
    letter-spacing: -0.02em;
    font-size: clamp(2rem, 3.5vw, 2.6rem);
}
.page-intro {
    margin: 0 0 36px;
    max-width: 720px;
    font-size: 1.05rem;
    color: var(--muted);
}

/* Sections */
.section {
    margin-top: 30px;
}
.section-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
}
.section-header {
    margin-bottom: 24px;
}
.section-header h2 {
    margin: 0 0 8px;
    font-size: clamp(1.5rem, 2vw, 2rem);
    letter-spacing: -0.02em;
}
.section-header p {
    margin: 0;
    color: var(--muted);
}

/* Cards grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}
.info-card {
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 24px;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #cfd7e1;
}
.info-card h3 {
    margin: 0 0 12px;
    font-size: 1.35rem;
    line-height: 1.3;
}
.info-card p {
    margin: 0 0 18px;
    color: var(--muted);
}
.info-card-footer {
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid #e9edf2;
}

/* Buttons */
.button,
.button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 18px;
    border-radius: 14px;
    font-weight: 700;
    transition: 0.18s ease;
    border: 1px solid transparent;
    cursor: pointer;
}
.button {
    background: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.button:hover {
    background: var(--accent-hover);
}
.button-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}
.button-secondary:hover {
    background: #fbfbfc;
    border-color: var(--border-strong);
}
.cards-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}
.process-step {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 24px;
}
.process-number {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-weight: 800;
    margin-bottom: 14px;
    box-shadow: var(--shadow-sm);
}
.process-step h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}
.process-step p {
    margin: 0;
    color: var(--muted);
}

.cta-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    background: linear-gradient(180deg, var(--accent-gradient) 0%, #ffffff 100%);
    border: 1px solid var(--accent-border);
    border-radius: 24px;
    padding: 28px 32px;
}
.cta-panel h2 {
    margin: 0 0 8px;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}
.cta-panel p {
    margin: 0;
    color: var(--muted);
}
.cta-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

@media (max-width: 980px) {
    .cards-grid-2,
    .process-grid {
        grid-template-columns: 1fr;
    }

    .cta-panel {
        flex-direction: column;
        align-items: flex-start;
    }
}
.about-hero {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 24px;
    align-items: start;
}
.lead {
    margin: 0;
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 780px;
}
.profile-panel {
    background: linear-gradient(180deg, var(--accent-gradient) 0%, #ffffff 100%);
    border: 1px solid #ffe0cc;
    border-radius: 22px;
    padding: 24px;
}
.profile-panel h2 {
    margin: 0 0 14px;
    font-size: 1.1rem;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}
.principle-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 24px;
}
.principle-card h3 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}
.principle-card p {
    margin: 0;
    color: var(--muted);
}

.stack-layout {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}
.stack-block {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 24px;
}
.stack-block h3 {
    margin: 0 0 14px;
    font-size: 1.1rem;
}

@media (max-width: 980px) {
    .about-hero,
    .principles-grid,
    .stack-layout {
        grid-template-columns: 1fr;
    }
}

.about-list {
    margin: 16px 0 28px;
    padding-left: 20px;
    color: var(--muted);
}
.about-list li {
    margin-bottom: 6px;
}
.about-cta {
    margin-top: 28px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Contact form */
.form-shell {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
}
.contact-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 24px;
}
.contact-form {
    max-width: 100%;
}
.form-row {
    margin-bottom: 18px;
}
.form-row label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.96rem;
    font-weight: 700;
}
.form-row input,
.form-row textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    padding: 14px 16px;
    font: inherit;
    color: var(--text);
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.form-row input:focus,
.form-row textarea:focus {
    outline: none;
    border-color: #ffb186;
    box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.12);
}

.validation-error {
    display: block;
    margin-top: 6px;
    color: var(--error-text);
    font-size: 0.92rem;
}

.form-message {
    margin-bottom: 20px;
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid transparent;
    font-weight: 600;
}
.form-message.success {
    background: var(--success-bg);
    border-color: var(--success-border);
    color: var(--success-text);
}
.form-message.error {
    background: var(--error-bg);
    border-color: var(--error-border);
    color: var(--error-text);
}



/* Footer */
.site-footer {
    flex-shrink: 0;
    border-top: 1px solid var(--border);
    background: #ffffff;
    margin-top: auto;
}
.footer-inner {
    padding: 24px 0 34px;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}
.footer-brand {
    max-width: 520px;
}
.footer-brand h3 {
    margin: 0 0 8px;
    font-size: 1.05rem;
}
.footer-brand p,
.footer-meta p {
    margin: 0 0 6px;
    color: var(--muted);
}
.footer-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 10px;
}
.footer-links a {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-weight: 600;
}
.footer-links a:hover {
    border-color: var(--border-strong);
}

/* Simple content */
.content-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 32px;
}

/* Responsive */
@media (max-width: 980px) {
    .hero-grid,
    .contact-layout,
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .hero-card {
        padding: 36px;
    }
}

@media (max-width: 768px) {
    .site-main {
        padding: 28px 0 48px;
    }

    .header-inner {
        min-height: 70px;
        flex-wrap: wrap;
        padding: 12px 0;
    }

    .menu-toggle {
        display: inline-block;
    }

    .main-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding-top: 10px;
    }

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

    .main-nav a {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 14px;
    }

    .hero-card,
    .section-card,
    .form-shell,
    .content-card {
        padding: 24px;
        border-radius: 20px;
    }

    .hero-card h1 {
        font-size: 2rem;
    }
}