/* ===== Базовые сбросы ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --fg: #2c3e50;
    --fg-muted: #6c757d;
    --fg-light: #adb5bd;
    --border: #e9ecef;
    --border-focus: #ced4da;
    --btn-bg: #e9ecef;
    --btn-bg-hover: #dee2e6;
    --btn-fg: #2c3e50;
    --error-bg: #fdf2f2;
    --error-fg: #b04a4a;
    --error-border: #f0d4d4;
    --success-bg: #f8f9fa;
    --success-fg: #2c3e50;
    --success-border: #e9ecef;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.02), 0 8px 24px rgba(0,0,0,0.03);
    --font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

html, body {
    min-height: 100%;
}

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.5;
    color: var(--fg);
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    padding: max(24px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

/* ===== Карточка ===== */
.card {
    width: 100%;
    max-width: 420px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px 28px;
}

.card__header {
    margin-bottom: 28px;
    text-align: center;
}

.card__title {
    font-size: 28px;
    font-weight: 300;
    color: var(--fg);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.card__subtitle {
    color: var(--fg-muted);
    font-size: 15px;
}

.card__subtitle code,
.field__hint code {
    font-family: var(--mono);
    font-size: 0.9em;
    background: var(--bg);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--fg-muted);
}

/* ===== Поля ===== */
.form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field__label {
    font-size: 14px;
    font-weight: 400;
    color: var(--fg-muted);
}

.field__input {
    width: 100%;
    padding: 12px 14px;
    font-size: 16px;
    font-family: inherit;
    color: var(--fg);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    -webkit-appearance: none;
    appearance: none;
}

.field__input::placeholder {
    color: var(--fg-light);
    transition: opacity 0.15s;
}

.field__input:focus::placeholder {
    opacity: 0;
}

.field__input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(206, 212, 218, 0.25);
}

.field__input:invalid:not(:placeholder-shown) {
    border-color: #e0b4b4;
}

.field__hint {
    font-size: 12px;
    color: var(--fg-light);
}

/* ===== Кнопка ===== */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    min-height: 48px;
    padding: 12px 20px;
    margin-top: 6px;
    font-size: 16px;
    font-weight: 400;
    font-family: inherit;
    color: var(--btn-fg);
    background: var(--btn-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s;
    -webkit-tap-highlight-color: transparent;
}

.btn:hover:not(:disabled) { background: var(--btn-bg-hover); }
.btn:active:not(:disabled) { transform: scale(0.99); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn__spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(44, 62, 80, 0.15);
    border-top-color: var(--btn-fg);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Сообщения ===== */
.message {
    margin-top: 18px;
    padding: 12px 14px;
    font-size: 14px;
    border-radius: 6px;
    border: 1px solid transparent;
    word-break: break-word;
}

.message--success {
    background: var(--success-bg);
    color: var(--success-fg);
    border-color: var(--success-border);
}

.message--error {
    background: var(--error-bg);
    color: var(--error-fg);
    border-color: var(--error-border);
}

/* ===== Футер (как на jcq.su) ===== */
.card__footer {
    margin-top: 28px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--fg-light);
    text-align: center;
}

/* ===== Мобильная адаптация ===== */
@media (max-width: 480px) {
    body {
        padding: 16px 12px;
        align-items: flex-start;
    }
    .card {
        padding: 24px 20px;
    }
    .card__title { font-size: 24px; }
    .field__input { padding: 11px 12px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* Тёмная тема */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1c1f22;
        --card-bg: #26292d;
        --fg: #e6e8ea;
        --fg-muted: #9aa0a6;
        --fg-light: #6b7075;
        --border: #34383d;
        --border-focus: #4a4f55;
        --btn-bg: #34383d;
        --btn-bg-hover: #3d4248;
        --btn-fg: #e6e8ea;
        --error-bg: #2e2020;
        --error-fg: #e0a8a8;
        --error-border: #4a3030;
        --success-bg: #26292d;
        --success-fg: #e6e8ea;
        --success-border: #34383d;
        --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.25);
    }
}

/* ===== Инструкция после регистрации ===== */
.steps {
    margin: 8px 0 24px;
}

.steps__title {
    font-size: 16px;
    font-weight: 500;
    color: var(--fg);
    margin-bottom: 16px;
    text-align: center;
}

.steps__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.steps__item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.steps__num {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--fg-muted);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    margin-top: 1px;
}

.steps__content {
    flex: 1;
    min-width: 0;
}

.steps__text {
    margin: 0 0 8px;
    font-size: 14px;
    color: var(--fg);
    line-height: 1.5;
}

.steps__text strong {
    font-weight: 500;
}

.steps__code {
    display: block;
    padding: 8px 12px;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--fg);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    word-break: break-all;
}

/* Кнопки магазинов */
.stores {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.store {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    font-size: 14px;
    color: var(--fg);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.store:hover {
    background: var(--card-bg);
    border-color: var(--border-focus);
}

.store__icon {
    font-size: 16px;
    line-height: 1;
}

.btn--secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--fg-muted);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--bg);
    color: var(--fg);
}

/* ===== Кнопка копирования ===== */
.copy-row {
    display: flex;
    align-items: stretch;
    gap: 8px;
}

.copy-row__value {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    padding: 10px 12px;
    font-family: var(--mono);
    font-size: 14px;
    color: var(--fg);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    font-family: inherit;
    font-size: 14px;
    color: var(--fg-muted);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    -webkit-tap-highlight-color: transparent;
    white-space: nowrap;
}

.copy-btn:hover {
    background: var(--bg);
    color: var(--fg);
    border-color: var(--border-focus);
}

.copy-btn:active {
    transform: scale(0.98);
}

.copy-btn__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.copy-btn--copied {
    color: #2e7d32;
    border-color: #c8e6c9;
    background: #f1f8f2;
}

@media (prefers-color-scheme: dark) {
    .copy-btn--copied {
        color: #86efac;
        border-color: #2e4a33;
        background: #1b2a1f;
    }
}

@media (max-width: 480px) {
    .copy-row {
        flex-direction: column;
    }
    .copy-row__value {
        text-align: center;
        justify-content: center;
    }
    .copy-btn {
        justify-content: center;
        min-height: 44px;
    }
}