/* iOS-стиль переменные */
:root {
    --primary-color: #007aff;
    --primary-hover: #0056cc;
    --background: #f2f2f7;
    --card-background: #ffffff;
    --text-primary: #000000;
    --text-secondary: #8e8e93;
    --text-tertiary: #c7c7cc;
    --border-color: #e5e5ea;
    --success-color: #34c759;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-elevated: 0 4px 16px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px 16px;
    min-height: 100vh;
}

/* Заголовок */
.header {
    text-align: center;
    margin-bottom: 32px;
    padding-top: 20px;
}

.header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.header p {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Карточка формы */
.form-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

/* Группы полей формы */
.form-group {
    margin-bottom: 20px;
}

.form-group:last-of-type {
    margin-bottom: 24px;
}

label {
    display: block;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

/* Стили для input */
input[type='text'],
input[type='number'],
input[type='time'] {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--card-background);
    color: var(--text-primary);
    transition: var(--transition);
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

input[type='text']:focus,
input[type='number']:focus,
input[type='time']:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

input[type='text']::placeholder,
input[type='number']::placeholder {
    color: var(--text-tertiary);
}

/* Стили для select */
.select-wrapper {
    position: relative;
}

select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background: var(--card-background);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.select-arrow {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-secondary);
}

/* Поле суммы */
.amount-input {
    position: relative;
    display: flex;
    align-items: center;
}

.amount-input input {
    padding-right: 32px;
}

.currency {
    position: absolute;
    right: 16px;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    pointer-events: none;
}

/* Текст помощи */
.help-text {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 400;
}

/* Тоггл переключатель iOS стиль */
.toggle-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

.toggle-label {
    margin-bottom: 0 !important;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.toggle-wrapper {
    position: relative;
}

.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-slider {
    position: relative;
    display: inline-block;
    width: 51px;
    height: 31px;
    background-color: var(--text-tertiary);
    border-radius: 31px;
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 27px;
    height: 27px;
    border-radius: 50%;
    background-color: white;
    top: 2px;
    left: 2px;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-input:checked + .toggle-slider {
    background-color: var(--primary-color);
}

.toggle-input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-input:focus + .toggle-slider {
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* Кнопка генерации */
.generate-btn {
    width: 100%;
    padding: 16px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-small);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 52px;
}

.generate-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-elevated);
}

.generate-btn:active:not(:disabled) {
    transform: translateY(0);
}

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Спиннер */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Карточка результата */
.result-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-top: 24px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    text-align: center;
    margin-bottom: 20px;
}

.result-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--success-color);
    margin-bottom: 4px;
}

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

.result-content {
    text-align: center;
}

.result-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn,
.new-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--border-radius-small);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

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

.download-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.pdf-btn {
    background: #ff6b35 !important;
}

.pdf-btn:hover {
    background: #e55a2f !important;
}

.new-btn {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.new-btn:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

/* Адаптивность */
@media (max-width: 480px) {
    .container {
        padding: 16px 12px;
    }

    .form-card,
    .result-card {
        padding: 20px;
    }

    .header h1 {
        font-size: 24px;
    }

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

    .download-btn,
    .new-btn {
        justify-content: center;
    }
}

/* Dark mode поддержка */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #000000;
        --card-background: #1c1c1e;
        --text-primary: #ffffff;
        --text-secondary: #8e8e93;
        --text-tertiary: #48484a;
        --border-color: #38383a;
    }

    .generate-btn:hover:not(:disabled) {
        background: var(--primary-hover);
    }

    .new-btn {
        background: #2c2c2e;
        border-color: #48484a;
    }

    .new-btn:hover {
        background: #48484a;
    }
}