:root {
    --color-bg: #f7f8fa;
    --color-surface: #ffffff;
    --color-surface-secondary: #f3f4f6;
    --color-text: #1a1d24;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-border: #e5e7eb;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-success-bg: #ecfdf5;
    --color-success-text: #065f46;
    --color-success-border: #a7f3d0;
    --color-warning-bg: #fffbeb;
    --color-warning-text: #92400e;
    --color-error-bg: #fef2f2;
    --color-error-text: #991b1b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --radius-md: 8px;
    --radius-lg: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 32px 20px;
}

.container.narrow {
    max-width: 480px;
}

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

.header h1 {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 6px;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: 14px;
}

h1, h2, h3 { font-weight: 600; line-height: 1.3; }
h1 { font-size: 22px; }
h2 { font-size: 18px; }
h3 { font-size: 16px; }
p { margin-bottom: 8px; }

.calc-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.calc-header {
    background: var(--color-surface-secondary);
    border-radius: var(--radius-lg);
    padding: 16px 18px;
    margin-bottom: 20px;
}

.calc-eyebrow {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
    margin-top: 0;
}

.calc-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    line-height: 1.4;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
}

.hint {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.form-row .form-group {
    margin-bottom: 0;
}

.field-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="url"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.mode-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.mode-btn {
    padding: 10px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.15s;
}

.mode-btn:hover {
    background: var(--color-bg);
}

.mode-btn.active {
    background: #eff6ff;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.fraction-input {
    display: flex;
    align-items: center;
    gap: 8px;
}

.fraction-input input {
    text-align: center;
    flex: 1;
}

.fraction-divider {
    font-size: 18px;
    color: var(--color-text-secondary);
}

.btn {
    display: inline-block;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: background-color 0.15s, transform 0.05s;
    text-decoration: none;
    text-align: center;
}

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

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    width: 100%;
    margin-top: 8px;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
}

.result-card {
    background: var(--color-success-bg);
    border: 1px solid var(--color-success-border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin-top: 16px;
}

.result-title {
    font-size: 13px;
    color: var(--color-success-text);
    font-weight: 500;
    margin-bottom: 12px;
    margin-top: 0;
}

.result-list {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px 16px;
    font-size: 14px;
    color: var(--color-success-text);
}

.result-list .result-name {
    color: var(--color-success-text);
}

.result-list .result-value {
    font-weight: 600;
}

.alert {
    padding: 12px 14px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    margin-top: 12px;
    font-size: 13px;
    line-height: 1.5;
}

.alert-error {
    background-color: var(--color-error-bg);
    color: var(--color-error-text);
}

.alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success-text);
}

.alert-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning-text);
}

code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
}

.footer {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 13px;
    margin-top: 32px;
    padding: 20px 0;
}

.footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-text-muted);
}

.footer a:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

@media (max-width: 480px) {
    .container { padding: 20px 16px; }
    .header h1 { font-size: 26px; }
    .calc-card { padding: 16px; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .form-row .form-group { margin-bottom: 16px; }
}

/* === Плашка установки приложения === */
.install-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 14px 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.install-banner-icon {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    background: #eff6ff;
    color: var(--color-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.install-banner-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.install-banner-text strong {
    font-size: 14px;
    color: var(--color-text);
    font-weight: 600;
}

.install-banner-text span {
    font-size: 12px;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.install-banner-btn {
    flex-shrink: 0;
    padding: 8px 14px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s;
}

.install-banner-btn:hover {
    background: var(--color-primary-hover);
}

@media (max-width: 480px) {
    .install-banner {
        flex-wrap: wrap;
    }
    .install-banner-text {
        flex: 1 1 calc(100% - 50px);
    }
    .install-banner-btn {
        flex: 1 1 100%;
        margin-top: 4px;
        padding: 10px;
    }
}

/* === Модальное окно === */
.install-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s, visibility 0.2s;
}

.install-modal.open {
    visibility: visible;
    opacity: 1;
}

.install-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
}

.install-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: calc(100% - 32px);
    max-width: 500px;
    max-height: calc(100vh - 32px);
    overflow-y: auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

.install-modal-close {
    position: absolute;
    top: 12px;
    right: 14px;
    background: none;
    border: none;
    font-size: 26px;
    color: var(--color-text-secondary);
    cursor: pointer;
    line-height: 1;
    padding: 4px 8px;
}

.install-modal-close:hover {
    color: var(--color-text);
}

.install-modal-content h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    padding-right: 30px;
}

.install-modal-intro {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.5;
}

.install-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 16px;
    background: var(--color-surface-secondary);
    padding: 4px;
    border-radius: 8px;
}

.install-tab {
    padding: 8px 4px;
    background: transparent;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.install-tab:hover {
    color: var(--color-text);
}

.install-tab.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.install-section {
    display: none;
}

.install-section.active {
    display: block;
}

.install-steps {
    list-style: none;
    counter-reset: step;
    padding: 0;
    margin: 0;
}

.install-steps li {
    counter-increment: step;
    position: relative;
    padding-left: 36px;
    padding-top: 4px;
    padding-bottom: 12px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text);
}

.install-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 2px;
    width: 24px;
    height: 24px;
    background: #eff6ff;
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.install-tip {
    background: var(--color-success-bg);
    color: var(--color-success-text);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 13px;
    margin-top: 8px;
    line-height: 1.5;
}

.install-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 13px;
    margin-bottom: 12px;
    line-height: 1.5;
}

.install-modal-footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.install-pdf-link {
    display: inline-block;
    color: var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: background-color 0.15s;
}

.install-pdf-link:hover {
    background: #eff6ff;
}
/* === Юридические документы (политика, условия) === */
.legal-doc {
    line-height: 1.7;
}

.legal-doc h2 {
    font-size: 17px;
    font-weight: 600;
    margin-top: 28px;
    margin-bottom: 10px;
    color: var(--color-text);
}

.legal-doc h2:first-of-type {
    margin-top: 16px;
}

.legal-doc p {
    margin-bottom: 12px;
    color: var(--color-text);
    font-size: 14px;
}

.legal-doc ul {
    margin-bottom: 14px;
    padding-left: 22px;
}

.legal-doc li {
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--color-text);
}

.legal-doc a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s;
}

.legal-doc a:hover {
    border-bottom-color: var(--color-primary);
}

.legal-meta {
    color: var(--color-text-secondary);
    font-size: 13px;
    margin-bottom: 8px;
    margin-top: 0 !important;
}

.legal-footer {
    margin-top: 32px;
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

/* === Ссылки в подвале === */
.footer-links {
    margin-top: 6px;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    margin: 0 6px;
    border-bottom: 1px dashed var(--color-text-muted);
}

.footer-links a:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}
/* === Подсказка под полем формы === */
.field-hint {
    margin: 6px 0 0 0;
    font-size: 12px;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.4;
}

/* === Cookies-плашка === */
.cookie-banner {
    position: fixed;
    bottom: 16px;
    left: 16px;
    right: 16px;
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 14px 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.10);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 100;
    transform: translateY(20px);
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.cookie-banner.visible {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}

.cookie-banner-text {
    flex: 1;
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-text);
}

.cookie-banner-text a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.cookie-banner-text a:hover {
    border-bottom-color: var(--color-primary);
}

.cookie-banner-btn {
    flex-shrink: 0;
    padding: 8px 16px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.15s;
}

.cookie-banner-btn:hover {
    background: var(--color-primary-hover);
}

@media (max-width: 480px) {
    .cookie-banner {
        flex-wrap: wrap;
    }
    .cookie-banner-text {
        flex: 1 1 100%;
    }
    .cookie-banner-btn {
        flex: 1 1 100%;
        padding: 10px;
    }
}