/* ==========================================================================
   PDF-полка — стили лендинга и админки. Ванильный CSS, без сборщиков.
   ========================================================================== */

:root {
    --ink: #1f2a44;
    --ink-soft: #4a5670;
    --muted: #8a94a6;
    --bg: #f6f7fb;
    --panel: #ffffff;
    --line: #e4e8f0;
    --accent: #2f6fed;
    --accent-dark: #1e56c8;
    --success: #1e9e6a;
    --danger: #d64545;
    --warning-bg: #fff4d6;
    --warning-ink: #7a5b00;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(31, 42, 68, .08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink);
    background: var(--bg);
}

h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
a { color: var(--accent); }
code { background: #eef1f7; padding: .1em .4em; border-radius: 5px; font-size: .9em; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 640px; }

.text-muted { color: var(--muted); }

/* --- Плашка «демо» ------------------------------------------------------ */

.demo-banner {
    background: var(--warning-bg);
    color: var(--warning-ink);
    text-align: center;
    padding: 8px 16px;
    font-size: .9rem;
}
.demo-banner a { color: inherit; font-weight: 600; }

/* --- Шапка -------------------------------------------------------------- */

.site-header {
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 10;
}
.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 60px;
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
}
.logo {
    font-weight: 800;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--ink);
    letter-spacing: -.02em;
}
.logo span { color: var(--accent); }
.logo em { font-style: normal; font-weight: 500; color: var(--muted); font-size: .85rem; }

.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a {
    text-decoration: none;
    color: var(--ink-soft);
    font-size: .95rem;
}
.site-nav a:hover, .site-nav a.is-active { color: var(--accent); }

/* --- Кнопки ------------------------------------------------------------- */

.btn {
    display: inline-block;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 10px 20px;
    font-size: .95rem;
    font-weight: 600;
    font-family: inherit;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: background .15s, color .15s, border-color .15s;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dark); }
.btn--ghost {
    background: transparent;
    color: var(--ink-soft);
    border-color: var(--line);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--lg { padding: 14px 28px; font-size: 1.05rem; }
.btn--sm { padding: 5px 12px; font-size: .85rem; }
.btn--wide { width: 100%; }

/* --- Hero ---------------------------------------------------------------- */

.hero {
    background: linear-gradient(135deg, #1f2a44 0%, #2b3c66 55%, #2f6fed 130%);
    color: #fff;
    padding: 56px 0;
}
.hero__inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
    align-items: center;
}
.hero__eyebrow {
    text-transform: uppercase;
    letter-spacing: .12em;
    font-size: .78rem;
    color: #9db4e8;
    margin: 0 0 12px;
}
.hero__desc { color: #c9d4ec; max-width: 46ch; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin: 24px 0 12px; }
.hero .btn--ghost { color: #dbe4f7; border-color: rgba(255, 255, 255, .35); }
.hero .btn--ghost:hover { border-color: #fff; color: #fff; }
.hero__note { font-size: .85rem; color: #9db4e8; margin: 0; }
.hero__cover { display: flex; justify-content: center; }
.hero__cover .cover { max-width: 260px; box-shadow: 0 24px 48px rgba(0, 0, 0, .35); }

/* --- Обложки ------------------------------------------------------------- */

.cover {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border-radius: 10px;
    display: block;
}
/* Плейсхолдер вместо картинки: градиент с оттенком из --hue */
.cover--placeholder {
    display: flex;
    align-items: flex-end;
    padding: 18px;
    background:
        radial-gradient(120% 90% at 85% 10%, hsl(var(--hue, 220) 80% 72% / .55), transparent 60%),
        linear-gradient(160deg, hsl(var(--hue, 220) 62% 46%), hsl(calc(var(--hue, 220) + 40) 60% 30%));
}
.cover--placeholder span {
    color: #fff;
    font-weight: 700;
    font-size: 1.05rem;
    line-height: 1.3;
    text-shadow: 0 2px 8px rgba(0, 0, 0, .35);
}

/* --- «Как это работает» --------------------------------------------------- */

.how { padding: 56px 0 24px; }
.how__steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 0;
    margin: 24px 0 0;
    counter-reset: step;
    list-style: none;
}
.how__steps li {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    counter-increment: step;
}
.how__steps li::before {
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    margin-bottom: 12px;
}
.how__steps strong { display: block; margin-bottom: 4px; }
.how__steps span { color: var(--muted); font-size: .92rem; }

/* --- Каталог -------------------------------------------------------------- */

.products { padding: 32px 0 72px; }
.products__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
    margin-top: 24px;
}
.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: var(--shadow);
}
.card__body { flex: 1; }
.card__body h3 { font-size: 1.1rem; }
.card__body p { color: var(--ink-soft); font-size: .92rem; margin: 0; }
.card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.card__price { font-size: 1.15rem; font-weight: 800; }

/* --- Сообщения ------------------------------------------------------------ */

.alert {
    border-radius: 10px;
    padding: 12px 16px;
    margin: 16px 0;
    font-size: .95rem;
}
.alert--error { background: #fdecec; color: #8f2323; }
.alert--info { background: #e8f0fe; color: #1d4a9e; }
.alert--success { background: #e3f6ee; color: #14684a; }

/* --- Модальное окно покупки ------------------------------------------------ */

.buy-dialog {
    border: none;
    border-radius: var(--radius);
    padding: 0;
    width: min(420px, calc(100vw - 32px));
    box-shadow: 0 30px 80px rgba(31, 42, 68, .35);
}
.buy-dialog::backdrop { background: rgba(31, 42, 68, .55); }
.buy-form { padding: 28px; position: relative; display: grid; gap: 14px; }
.buy-form__close {
    position: absolute;
    top: 10px;
    right: 14px;
    border: none;
    background: none;
    font-size: 1.6rem;
    color: var(--muted);
    cursor: pointer;
    line-height: 1;
}
.buy-form__title { margin: 0; padding-right: 24px; }
.buy-form__price { margin: 0; font-weight: 800; font-size: 1.2rem; color: var(--accent); }
.buy-form__hint { margin: 0; color: var(--muted); font-size: .85rem; }

/* Honeypot: убрано с глаз, но доступно ботам */
.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* --- Формы ------------------------------------------------------------------ */

.field { display: grid; gap: 6px; }
.field > span { font-size: .9rem; font-weight: 600; color: var(--ink-soft); }
.field input[type="text"],
.field input[type="email"],
.field textarea {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 11px 14px;
    font: inherit;
    width: 100%;
    background: #fff;
}
.field input:focus, .field textarea:focus {
    outline: 2px solid var(--accent);
    outline-offset: -1px;
    border-color: var(--accent);
}
.field input[type="file"] { font-size: .92rem; }
.field--short { max-width: 220px; }
.field small { line-height: 1.4; }

/* --- Панели и внутренние страницы ------------------------------------------- */

.narrow-page { padding: 40px 0 72px; }
.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}

/* Демо-оплата */
.pay-panel__badge {
    display: inline-block;
    background: #e8f0fe;
    color: #1d4a9e;
    border-radius: 999px;
    font-size: .8rem;
    padding: 4px 12px;
    margin: 0 0 14px;
}
.pay-panel__details { margin: 20px 0; display: grid; gap: 8px; }
.pay-panel__details div { display: flex; justify-content: space-between; gap: 16px; }
.pay-panel__details dt { color: var(--muted); }
.pay-panel__details dd { margin: 0; font-weight: 600; text-align: right; }
.pay-panel__amount { font-size: 1.3rem; font-weight: 800; }
.pay-panel__actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0 12px; }
.pay-panel__hint { color: var(--muted); font-size: .88rem; }

/* Спасибо / ошибки */
.thankyou { text-align: center; }
.thankyou__icon { font-size: 2.6rem; margin-bottom: 8px; }
.thankyou__icon--ok {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--success);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}
.thankyou__note { color: var(--muted); font-size: .92rem; }
.thankyou .btn { margin-top: 12px; }

/* Демо-почта */
.mail-view__meta { color: var(--muted); font-size: .9rem; }
.mail-view__frame {
    width: 100%;
    height: 640px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
}

/* --- Таблицы (админка, почта) ------------------------------------------------ */

.table { width: 100%; border-collapse: collapse; font-size: .93rem; }
.table th, .table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}
.table th { color: var(--muted); font-weight: 600; white-space: nowrap; }
.table tr:last-child td { border-bottom: none; }
.table tr.is-muted { opacity: .55; }
.table__actions { display: flex; gap: 8px; white-space: nowrap; }
.table__actions form { display: inline; }

.badge {
    display: inline-block;
    border-radius: 999px;
    padding: 2px 10px;
    font-size: .8rem;
    font-weight: 600;
}
.badge--paid { background: #e3f6ee; color: #14684a; }
.badge--pending { background: #fff4d6; color: #7a5b00; }
.badge--failed { background: #fdecec; color: #8f2323; }

/* --- Админка ------------------------------------------------------------------ */

.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}
.page-head h1 { margin: 0; font-size: 1.6rem; }

.tabs { display: flex; gap: 6px; margin-bottom: 18px; flex-wrap: wrap; }
.tabs a {
    text-decoration: none;
    color: var(--ink-soft);
    padding: 7px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    font-size: .92rem;
    background: var(--panel);
}
.tabs a.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }

.admin-form { display: grid; gap: 18px; max-width: 560px; }

/* --- Подвал --------------------------------------------------------------------- */

.site-footer {
    border-top: 1px solid var(--line);
    background: var(--panel);
    padding: 20px 0;
    font-size: .9rem;
    color: var(--muted);
}
.site-footer__inner {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.site-footer nav { display: flex; gap: 16px; }
.site-footer a { color: var(--muted); }

/* --- Мобильная вёрстка ------------------------------------------------------------ */

@media (max-width: 820px) {
    .hero { padding: 40px 0; }
    .hero__inner { grid-template-columns: 1fr; gap: 28px; }
    .hero__cover { order: -1; }
    .hero__cover .cover { max-width: 180px; }
    .how__steps { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .site-header__inner { justify-content: center; }
    .pay-panel__actions .btn { width: 100%; }
    .page-head .btn { width: 100%; }
    .panel { padding: 20px; }
    /* Таблицы прокручиваются, а не ломают вёрстку */
    .panel { overflow-x: auto; }
    .mail-view__frame { height: 480px; }
}