/* =========================
   БАЗА
   ========================= */

:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --text: #172033;
    --muted: #647084;
    --line: #e5eaf1;
    --accent: #2563eb;
    --accent-dark: #1d4ed8;
    --accent-soft: #eff6ff;
    --dark: #111827;
    --radius: 20px;
    --shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
    --shadow-hover: 0 18px 42px rgba(15, 23, 42, 0.13);
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    opacity: 1;
    transition: opacity 0.18s ease;
}

body.page-leaving {
    opacity: 0;
}

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

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

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.container {
    width: min(1120px, calc(100% - 40px));
    margin-inline: auto;
}


/* =========================
   ШАПКА
   ========================= */

.top-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    height: 72px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid rgba(229, 234, 241, 0.9);
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.04);
    backdrop-filter: blur(14px);
}

.nav {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    font-size: 22px;
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
}

.brand::before {
    content: "";
    width: 9px;
    height: 9px;
    margin-right: 10px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 6px var(--accent-soft);
}


/* =========================
   КНОПКИ И ССЫЛКИ
   ========================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    width: fit-content;
    padding: 12px 22px;
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 12px;
    background: #fff;
    color: var(--accent);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.12);
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background-color 0.2s ease,
        color 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
}

.btn:focus-visible,
.text-link:focus-visible,
.brand:focus-visible,
.contact-list a:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.28);
    outline-offset: 4px;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    color: var(--accent);
    font-weight: 700;
}

.text-link::after {
    content: "→";
    transition: transform 0.2s ease;
}

.text-link:hover::after {
    transform: translateX(3px);
}

.text-link:hover {
    color: var(--accent-dark);
}


/* =========================
   ГЛАВНЫЙ ЭКРАН
   ========================= */

.welcome {
    padding: 104px 0 32px;
}

.welcome-content {
    position: relative;
    min-height: 610px;
    padding: clamp(40px, 7vw, 78px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 16px;
    overflow: hidden;
    border-radius: 28px;
    color: #fff;
    isolation: isolate;
    background:
        linear-gradient(110deg, rgba(8, 18, 38, 0.88), rgba(15, 23, 42, 0.48)),
        url("https://abrakadabra.fun/uploads/posts/2022-01/1643276179_1-abrakadabra-fun-fon-igrovoi-tematiki-1.jpg")
        center / cover;
    box-shadow: 0 22px 60px rgba(15, 23, 42, 0.18);
}

.welcome-content::after {
    content: "";
    position: absolute;
    width: 320px;
    height: 320px;
    right: -100px;
    bottom: -130px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.26);
    filter: blur(8px);
    z-index: -1;
}

.welcome h1 {
    max-width: 760px;
    margin: 0;
    font-size: clamp(42px, 6vw, 68px);
    line-height: 1.03;
    letter-spacing: -0.045em;
}

.welcome-tag {
    margin: 0;
    color: #bfdbfe;
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.welcome-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}


/* =========================
   ОБО МНЕ
   ========================= */

.about-section {
    padding: 72px 0 36px;
    background: var(--surface);
}

.about-container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(280px, 420px) 1fr;
    align-items: center;
    gap: clamp(35px, 6vw, 80px);
}

.about-image {
    position: relative;
}

.about-image::after {
    content: "";
    position: absolute;
    inset: 14px -14px -14px 14px;
    border: 2px solid #dbeafe;
    border-radius: 18px;
    z-index: 0;
}

.about-image img {
    position: relative;
    z-index: 1;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.about-content h2 {
    margin: 0 0 14px;
    font-size: clamp(30px, 4vw, 40px);
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--text);
}

.about-content p {
    max-width: 680px;
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}


/* =========================
   НАВЫКИ
   ========================= */

.cards-section {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
    padding: 36px 0 72px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.card {
    min-height: 210px;
    padding: 26px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
    transition:
        transform 0.22s ease,
        box-shadow 0.22s ease,
        border-color 0.22s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: #cbdcfb;
    box-shadow: var(--shadow-hover);
}

.card h3 {
    margin: 0 0 12px;
    color: var(--accent);
    font-size: 20px;
    line-height: 1.25;
}

.card p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}


/* =========================
   ВНУТРЕННИЕ СТРАНИЦЫ
   ========================= */

.page-content {
    width: min(900px, calc(100% - 40px));
    min-height: calc(100vh - 72px);
    margin: 0 auto;
    padding: 132px 0 72px;
    display: flex;
    align-items: flex-start;
}

.page-card {
    width: 100%;
    padding: clamp(30px, 6vw, 58px);
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.page-card h1 {
    margin: 0 0 14px;
    font-size: clamp(34px, 5vw, 48px);
    line-height: 1.1;
    letter-spacing: -0.035em;
}

.page-card p {
    max-width: 680px;
    margin: 0 0 28px;
    color: var(--muted);
    font-size: 17px;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.page-actions .btn {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.page-actions .btn:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
}


/* =========================
   ПОДВАЛ
   ========================= */

.site-footer {
    margin-top: 0;
    padding: 42px 0 34px;
    background: var(--dark);
    color: #fff;
    text-align: center;
}

.footer-content {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.footer-title {
    margin: 0 0 14px;
    color: #e5e7eb;
    font-weight: 700;
}

.contact-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 24px;
}

.contact-list a {
    color: #93c5fd;
    transition: color 0.2s ease;
}

.contact-list a:hover {
    color: #fff;
}

.copyright {
    margin: 22px 0 0;
    color: #9ca3af;
    font-size: 14px;
}


/* =========================
   АДАПТИВНОСТЬ
   ========================= */

@media (max-width: 980px) {
    .cards-section {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .container,
    .about-container,
    .cards-section,
    .page-content,
    .footer-content {
        width: min(100% - 28px, 680px);
    }

    .top-header {
        height: 66px;
    }

    .brand {
        font-size: 19px;
    }

    .welcome {
        padding-top: 84px;
        padding-bottom: 20px;
    }

    .welcome-content {
        min-height: 560px;
        padding: 36px 24px;
        border-radius: 22px;
    }

    .welcome h1 {
        font-size: clamp(38px, 12vw, 54px);
    }

    .welcome-actions {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    .welcome-actions .btn {
        width: 100%;
    }

    .about-section {
        padding-top: 52px;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 42px;
    }

    .about-image {
        width: min(100%, 430px);
        margin-inline: auto;
    }

    .about-content h2 {
        text-align: left;
    }

    .cards-section {
        grid-template-columns: 1fr;
        padding-top: 28px;
        padding-bottom: 54px;
    }

    .card {
        min-height: auto;
    }

    .page-content {
        min-height: calc(100vh - 66px);
        padding-top: 104px;
        padding-bottom: 48px;
    }

    .page-card {
        padding: 28px 22px;
        border-radius: 20px;
    }

    .page-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .page-actions .btn {
        width: 100%;
    }

    .site-footer {
        padding-top: 34px;
    }
}

@media (max-width: 420px) {
    body {
        font-size: 15px;
    }

    .brand::before {
        width: 7px;
        height: 7px;
        margin-right: 8px;
        box-shadow: 0 0 0 5px var(--accent-soft);
    }

    .welcome-content {
        min-height: 520px;
    }

    .welcome h1 {
        font-size: 38px;
    }

    .about-content p,
    .page-card p {
        font-size: 16px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}