/**
 * Базовые стили crosscalc.net (шрифты, кнопки, формы, контейнеры, светлая/тёмная тема).
 * Стили блоков/страниц — в отдельных файлах при необходимости.
 */

:root {
    /* Светлая тема */
    --color-bg: #f5f5f5;
    --color-surface: #fff;
    --color-text: #1a1a1a;
    --color-text-muted: #666;
    --color-link: #2563eb;
    --color-link-hover: #1d4ed8;
    --color-border: #e5e7eb;
    --color-border-hover: #c4c8cc;
    --color-accent: #2563eb;
    --color-button-bg: #2563eb;
    --color-button-text: #fff;
    --color-button-hover: #1d4ed8;
    --color-surface-hover: #eef2f7;
}

[data-theme="dark"] {
    --color-bg: #111;
    --color-surface: #1a1a1a;
    --color-text: #e5e5e5;
    --color-text-muted: #a3a3a3;
    --color-link: #60a5fa;
    --color-link-hover: #93c5fd;
    --color-border: #333;
    --color-border-hover: #555;
    --color-accent: #60a5fa;
    --color-button-bg: #2563eb;
    --color-button-text: #fff;
    --color-button-hover: #3b82f6;
    --color-surface-hover: #252525;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    transition: background-color 0.2s, color 0.2s;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Контейнер */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Кнопки */
button,
.btn {
    font: inherit;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0;
    background: var(--color-button-bg);
    color: var(--color-button-text);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
button:hover,
.btn:hover {
    background: var(--color-button-hover);
    border-color: var(--color-button-hover);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
.theme-toggle:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}
.theme-toggle .theme-icon {
    display: block;
}
.theme-toggle .icon-moon {
    display: none;
}
[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}
[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}

/* Заголовки */
h1, h2, h3 {
    margin-top: 0;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.25;
}
h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
    margin: 0 0 1em;
}
.lead {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* Header / Footer */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow 0.2s ease;
}
.site-header--scrolled {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
[data-theme="dark"] .site-header--scrolled {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
.site-header__backdrop {
    display: none;
}
.site-header .container.site-header__inner {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}
.site-header .container.site-header__inner {
    position: relative;
}
.site-header__row1 {
    display: flex;
    align-items: center;
    gap: 1rem 1.5rem;
    width: 100%;
    flex-wrap: wrap;
    transition: transform 0.25s ease, opacity 0.25s ease;
}
.site-header--scrolled .site-header__row1 {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}
.site-header--scrolled .site-header .container.site-header__inner {
    min-height: 140px;
    justify-content: flex-end;
}
.site-header__row2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem 1.25rem;
    width: 100%;
    flex-wrap: wrap;
    padding-top: 0.5rem;
    border-top: 1px solid var(--color-border);
}
.site-header--scrolled .site-header__row2 {
    border-top: none;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}
.site-header--scrolled .site-header .container.site-header__inner {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}
.site-logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
    margin-right: 0.5rem;
}
.site-logo:hover {
    opacity: 0.9;
}
.site-logo__img {
    display: block;
    width: 142px;
    height: 60px;
    object-fit: contain;
}
.site-header__row1 .site-nav__social {
    margin-right: auto;
}
.header-utils {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}
.site-header__account {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
.site-header__account:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    color: var(--color-text);
    text-decoration: none;
}
.site-header__account svg {
    display: block;
    width: 25px;
    height: 25px;
}
.site-header__burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    margin-left: auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}
.site-header__burger:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}
.site-header__burger-line {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    transition: transform 0.2s, opacity 0.2s;
}
.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(2) {
    opacity: 0;
}
.site-header__burger[aria-expanded="true"] .site-header__burger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}
.site-header__row2.site-nav {
    flex: 1;
    min-width: 0;
}
.site-nav__links {
    display: flex;
    align-items: center;
    gap: 0.75rem 1.25rem;
    flex-wrap: wrap;
}
.site-nav__links a {
    white-space: nowrap;
}
.site-nav a {
    white-space: nowrap;
}
.site-nav a.active {
    font-weight: 600;
}
.site-nav a:hover:not(.active) {
    color: var(--color-link-hover);
}
.site-nav__support {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    background: var(--color-accent);
    color: var(--color-button-text);
    border: 1px solid var(--color-accent);
    font-weight: 600;
    text-decoration: none;
    flex-shrink: 0;
}
.site-nav__support:hover {
    background: var(--color-button-hover);
    border-color: var(--color-button-hover);
    color: var(--color-button-text);
    text-decoration: none;
}
.site-nav__support.active {
    background: var(--color-button-hover);
    border-color: var(--color-button-hover);
}
.site-nav__social {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.site-nav__social a {
    display: inline-flex;
    padding: 0.25rem;
}
.site-nav__social a:hover {
    opacity: 0.8;
}
.menuitem__icon {
    display: block;
    width: 24px;
    height: 24px;
    color: var(--color-text);
}

@media (max-width: 900px) {
    .site-header__inner {
        flex-wrap: wrap;
    }
}

.site-header__mobile-extra {
    display: none;
}

@media (max-width: 768px) {
    .site-header .container.site-header__inner {
        flex-direction: row;
        flex-wrap: nowrap;
    }
    .site-header__row1 {
        width: auto;
        flex: 1;
        min-width: 0;
    }
    .site-header__row1 .site-nav__social,
    .site-header__row1 .site-header__account {
        display: none;
    }
    .site-header__mobile-extra {
        display: flex;
        align-items: center;
        gap: 1rem;
        padding-bottom: 1rem;
        margin-bottom: 1rem;
        border-bottom: 1px solid var(--color-border);
    }
    .site-header__mobile-extra .site-nav__social {
        margin-right: 0;
    }
    .site-header__burger {
        display: flex;
        flex-shrink: 0;
    }
    .site-header__backdrop {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 98;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s;
    }
    .site-header--open .site-header__backdrop {
        display: block;
        opacity: 1;
        pointer-events: auto;
    }
    .site-header__row2.site-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(320px, 100vw);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0;
        margin: 0;
        padding: 3rem 1.25rem 1.5rem;
        border-top: none;
        border-left: 1px solid var(--color-border);
        background: var(--color-surface);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.2s ease;
        z-index: 99;
    }
    .site-header--open .site-header__row2.site-nav {
        transform: translateX(0);
    }
    .site-nav__links {
        flex-direction: column;
        align-items: stretch;
    }
    .site-nav__links a {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-border);
    }
    .site-nav a.site-nav__support {
        padding: 0.4rem 0.9rem;
        margin-top: 0.5rem;
        text-align: center;
    }
}

[data-theme="dark"] .site-nav__social .menuitem__icon {
    color: var(--color-text);
}
.lang-form {
    display: inline-flex;
    align-items: center;
}
.lang-select {
    font: inherit;
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    border-radius: 0;
}
.lang-select:hover {
    border-color: var(--color-border-hover);
}
.lang-select:focus {
    outline: none;
    border-color: var(--color-accent);
}

.currency-form {
    display: inline-flex;
    align-items: center;
}
.currency-select {
    font: inherit;
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    border-radius: 0;
}
.currency-select:hover {
    border-color: var(--color-border-hover);
}
.currency-select:focus {
    outline: none;
    border-color: var(--color-accent);
}
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-main {
    min-height: 50vh;
    padding: 1.5rem 0;
}

.db-notice {
    margin: 0 0 1rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--color-text);
    background: var(--color-surface-hover);
    border: 1px solid var(--color-border);
    border-radius: 0;
}
.db-notice:hover {
    border-color: var(--color-border-hover);
}

/* Плашка согласия на cookie */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 1rem 0;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.25s ease, opacity 0.25s ease;
}
[data-theme="dark"] .cookie-banner {
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
}
.cookie-banner--hidden {
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}
.cookie-banner__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1rem;
}
.cookie-banner__text {
    margin: 0;
    flex: 1 1 280px;
    font-size: 0.875rem;
    color: var(--color-text);
}
.cookie-banner__link {
    flex-shrink: 0;
    font-size: 0.875rem;
}
.cookie-banner__btn {
    flex-shrink: 0;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}
.cookie-banner__btn:hover {
    background: var(--color-button-hover);
    border-color: var(--color-button-hover);
}

.site-footer {
    margin-top: 2rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}
.site-footer__inner {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.site-footer__top {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem 1.5rem;
}
.site-footer__nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
}
.site-footer__nav a {
    color: var(--color-text-muted);
    text-decoration: none;
}
.site-footer__nav a:hover {
    color: var(--color-link-hover);
}
.site-footer__copy {
    margin: 0;
}
.site-footer__disclaimer {
    margin: 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    max-width: 56em;
}

/* Хлебные крошки */
.breadcrumbs {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}
.breadcrumbs a:hover {
    color: var(--color-link-hover);
}

/* Страница главная */
.page-home .hero {
    text-align: center;
    padding: 2rem 0;
}