/* ============================================
   БАЗОВЫЕ СТИЛИ И ПЕРЕМЕННЫЕ
   ============================================ */

:root {
    /* Цветовая палитра из приложения */
    --color-primary: #2979FF;
    --color-dark: #10131A;
    --color-light-blue: #E3F0FF;
    --color-light-gray: #F3F6FA;
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-black87: rgba(0, 0, 0, 0.87);
    --color-black54: rgba(0, 0, 0, 0.54);
    --color-black38: rgba(0, 0, 0, 0.38);
    
    /* Градиенты */
    --gradient-main: linear-gradient(135deg, #FFFFFF 0%, #F3F6FA 30%, #E3F0FF 60%, #2979FF 85%, #10131A 100%);
    --gradient-text: linear-gradient(135deg, #2979FF 0%, #10131A 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.45) 0%, rgba(255, 255, 255, 0.25) 100%);
    
    /* Тени */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.15);
    
    /* Скругления */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* Отступы */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* Шрифты */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
}

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

html {
    scroll-behavior: smooth;
    height: 100%;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    color: var(--color-black87);
    background: var(--gradient-main);
    background-attachment: fixed;
    background-size: 100% 100%;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ============================================
   АНИМИРОВАННЫЙ ФОН
   ============================================ */

.animated-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-height: 100vh;
    background: transparent;
    z-index: -1;
    overflow: hidden;
}

.floating-circle {
    position: absolute;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.1;
    filter: blur(20px);
    animation: float 8s ease-in-out infinite;
}

.circle-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.circle-3 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(20px, -20px) scale(1.1);
    }
}

/* ============================================
   НАВИГАЦИЯ
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    background: rgba(255, 255, 255, 0.7);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-sm);
    overflow: visible;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    min-height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0;
    text-decoration: none;
    color: var(--color-black87);
    margin: -20px 0;
    padding: 20px 0;
}

.logo-img {
    width: 120px;
    height: 60px;
    object-fit: contain;
    display: block;
}

.logo-text {
    font-size: 20px;
    font-weight: var(--font-weight-bold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-black87);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: 15px;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link.cta-nav {
    padding: 10px 20px;
    background: var(--color-black);
    color: var(--color-white);
    border-radius: var(--radius-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nav-link.cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--color-white);
}

/* ============================================
   ПЕРЕКЛЮЧАТЕЛЬ ЯЗЫКОВ
   ============================================ */

.language-switcher {
    position: relative;
    margin-left: var(--spacing-md);
    z-index: 1001;
}

.lang-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1.5px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-black87);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    position: relative;
    z-index: 1002;
}

.lang-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.lang-toggle-btn:active {
    transform: translateY(0);
}

.lang-toggle-btn svg {
    width: 20px;
    height: 20px;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1001;
    overflow: hidden;
    pointer-events: none;
    }
    
.lang-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: 12px 16px;
    border: none;
    background: transparent;
    color: var(--color-black87);
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: rgba(41, 121, 255, 0.08);
    color: var(--color-primary);
}

.lang-option.active {
    background: rgba(41, 121, 255, 0.12);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.lang-code {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 24px;
    padding: 0 8px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    font-weight: var(--font-weight-semibold);
    font-size: 12px;
    letter-spacing: 0.5px;
}

.lang-option.active .lang-code {
    background: var(--color-primary);
    color: var(--color-white);
}

.lang-name {
    flex: 1;
}

@media (max-width: 767px) {
    .language-switcher {
        margin-left: 0;
        margin-right: var(--spacing-sm);
    }
    
    .lang-dropdown {
        right: 0;
        left: auto;
        min-width: 140px;
    }
    
    .nav-links {
        display: none;
    }
}

@media (min-width: 768px) {
    .lang-dropdown {
        right: 0;
        left: auto;
    }
}

/* ============================================
   HERO СЕКЦИЯ
   ============================================ */

.hero {
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr 1fr;
    }
}

.hero-title {
    font-size: 42px;
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-black87);
    letter-spacing: -0.5px;
}

/* ============================================
   АНИМАЦИЯ ПЕРЕКЛЮЧЕНИЯ СЛОВ
   ============================================ */

.rotating-words {
    position: relative;
    display: inline-block;
    height: 1.2em;
    vertical-align: bottom;
    overflow: visible;
    /* Ширина будет установлена через JavaScript на основе самого длинного слова */
}

.rotating-words .word {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transform: translateY(30px) scale(0.9);
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    /* Убираем width: 100%, чтобы слова не растягивались */
}

.rotating-words .word.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    z-index: 2;
    /* Оставляем position: absolute для всех слов */
}

.rotating-words .word.exit {
    opacity: 0;
    transform: translateY(-30px) scale(0.9);
    z-index: 1;
}

/* Скрытый элемент для измерения максимальной ширины */
.rotating-words::after {
    content: attr(data-max-width);
    visibility: hidden;
    position: absolute;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
}

/* RTL поддержка для анимации */
body.rtl .rotating-words {
    direction: rtl;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 52px;
    }
    
    .gradient-text {
        white-space: nowrap;
        display: inline-block;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 58px;
    }
    
    .gradient-text {
        white-space: nowrap;
        display: inline-block;
    }
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 18px;
    color: var(--color-black54);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

@media (min-width: 768px) {
    .hero-description {
        font-size: 20px;
    }
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

@media (min-width: 768px) {
    .hero-buttons {
        flex-direction: row;
    }
}

/* ============================================
   КНОПКИ
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: 16px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.btn-large svg {
    width: 24px;
    height: 24px;
}

.btn-primary {
    background: var(--color-black);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-black87);
    border: 1.5px solid rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-large {
    padding: 20px 40px;
    font-size: 18px;
}

.btn-disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-disabled:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

/* ============================================
   PHONE MOCKUP
   ============================================ */

.phone-mockup {
    position: relative;
    max-width: 320px;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .phone-mockup {
        max-width: 400px;
    }
}

.phone-screen {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: 16px;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    background: rgba(255, 255, 255, 0.9);
}

.chat-interface {
    background: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-height: 400px;
}

.chat-header {
    display: flex;
    gap: 6px;
    padding: 16px;
    background: var(--color-light-gray);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.chat-header-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-black54);
}

.chat-messages {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    min-height: 300px;
    max-height: 400px;
    overflow: hidden;
    justify-content: flex-end;
    position: relative;
    align-items: stretch;
}

.message {
    display: flex;
    margin-bottom: var(--spacing-xs);
    opacity: 0;
    flex-shrink: 0;
    transform-origin: center bottom;
}

.message.message-visible {
    opacity: 1;
}

.message.user-message {
    justify-content: flex-end;
    align-items: flex-end;
}

.message.ai-message {
    justify-content: flex-start;
    align-items: flex-start;
}

.message-bubble {
    max-width: 75%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
    transform: translateZ(0);
    backface-visibility: hidden;
    position: relative;
    will-change: transform;
}

.message-text {
    white-space: pre-wrap;
}

.user-message .message-bubble {
    background: var(--color-light-gray);
    color: var(--color-black87);
    border-bottom-right-radius: 4px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
}

.ai-message .message-bubble {
    background: var(--color-primary);
    color: var(--color-white);
    border-bottom-left-radius: 4px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}

/* Фиксация ширины для message-bubble с превью */
.ai-message .message-bubble[style*="padding: 0"] {
    width: 80% !important;
    max-width: 80% !important;
    box-sizing: border-box;
    margin-left: 0;
    margin-right: auto;
}

/* Ширина превью 80% для всех устройств */
.preview-card {
    width: 80% !important;
    max-width: 80% !important;
    margin-left: 0;
    margin-right: auto;
}

.preview-image-container,
.preview-image-container.preview-pdf-style {
    width: 100% !important;
    max-width: 100% !important;
}

.preview-image,
.preview-image.preview-image-cropped {
    width: 100% !important;
    max-width: 100% !important;
}

@media (max-width: 767px) {
    /* Уменьшаем размеры демо-экрана для мобильных */
    .phone-screen {
        padding: 8px;
    }
    
    .chat-interface {
        min-height: 450px;
    }
    
    .chat-header {
        padding: 10px 12px;
    }
    
    .chat-header-dot {
        width: 6px;
        height: 6px;
    }
    
    .chat-messages {
        padding: 12px;
        gap: 8px;
        min-height: 380px;
        max-height: 420px;
    }
    
    .message-bubble {
        padding: 8px 12px;
        font-size: 12px;
        max-width: 80%;
        border-radius: 12px;
    }
    
    .typing-indicator span {
        width: 6px;
        height: 6px;
    }
    
    .preview-card {
        border-radius: 12px;
        margin-top: 6px;
    }
    
    .preview-image.preview-image-cropped {
        height: 150px;
    }
    
    .preview-pdf-footer {
        bottom: 8px;
        left: 8px;
        padding: 3px 6px;
        font-size: 12px;
    }
    
    .preview-pdf-footer::after {
        font-size: 12px;
    }
    
    .ai-message .message-bubble[style*="padding: 0"] {
        width: 80% !important;
        max-width: 80% !important;
    }
    
    .preview-card {
        width: 80% !important;
        max-width: 80% !important;
        margin-left: 0;
        margin-right: auto;
    }
    
    .preview-image-container,
    .preview-image-container.preview-pdf-style {
        width: 100% !important;
        max-width: 100% !important;
    }
    
    .preview-image,
    .preview-image.preview-image-cropped {
        width: 100% !important;
        max-width: 100% !important;
    }
}

.typing-indicator {
    display: flex;
    gap: 5px;
    align-items: center;
    padding: 4px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-white);
    animation: typingBounce 1.4s infinite ease-in-out;
    transform: translateZ(0);
    opacity: 0.6;
}

.typing-indicator span:nth-child(1) {
    animation-delay: 0s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0) scale(1);
        opacity: 0.6;
    }
    30% {
        transform: translateY(-8px) scale(1.1);
        opacity: 1;
    }
}

/* Состояния сообщений */
.message.typing {
    opacity: 0;
}

.message.typing.typing-visible {
    opacity: 1;
}

/* ============================================
   ПРЕВЬЮ ОТВЕТОВ (КАК В ПРИЛОЖЕНИИ)
   ============================================ */

.preview-card {
    width: 100%;
    max-width: 100%;
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 0, 0, 0.08);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-top: var(--spacing-xs);
    opacity: 0;
    will-change: transform, opacity;
    flex-shrink: 0;
    transform-origin: center bottom;
    box-sizing: border-box;
}

.preview-card.preview-visible {
    opacity: 1;
}

.preview-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-dark) 100%);
    color: var(--color-white);
    padding: 12px 16px;
    font-weight: var(--font-weight-semibold);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-header-icon {
    width: 16px;
    height: 16px;
    opacity: 0.9;
}

.preview-content {
    padding: 12px;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

.preview-table th {
    background: var(--color-light-gray);
    padding: 8px;
    text-align: left;
    font-weight: var(--font-weight-semibold);
    color: var(--color-black87);
    font-size: 11px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.preview-table td {
    padding: 8px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    color: var(--color-black87);
}

.preview-table tr:last-child td {
    border-bottom: none;
}

.preview-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-top: 8px;
}

.preview-stat-item {
    background: var(--color-light-gray);
    padding: 8px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.preview-stat-label {
    font-size: 10px;
    color: var(--color-black54);
    margin-bottom: 4px;
}

.preview-stat-value {
    font-size: 14px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

.preview-chart-placeholder {
    height: 120px;
    background: linear-gradient(135deg, var(--color-light-blue) 0%, rgba(41, 121, 255, 0.1) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 12px;
    font-weight: var(--font-weight-medium);
    margin-top: 8px;
}

.preview-parameters {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 10px;
    color: var(--color-black54);
}

.preview-param-item {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

.preview-param-icon {
    width: 12px;
    height: 12px;
    opacity: 0.6;
}

.preview-image-container {
    width: 100%;
    max-width: 100%;
    position: relative;
    background: var(--color-white);
    transform: translateZ(0);
    backface-visibility: hidden;
    box-sizing: border-box;
}

.preview-image-container.preview-pdf-style {
    width: 100%;
    max-width: 100%;
    background: transparent;
    padding: 0;
    border-radius: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
    box-sizing: border-box;
}

.preview-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 0;
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    transform: translateZ(0);
    box-sizing: border-box;
}

.preview-image.preview-image-cropped {
    width: 100%;
    max-width: 100%;
    height: 200px;
    display: block;
    border-radius: 0;
    margin: 0;
    padding: 0;
    flex-shrink: 0;
    object-fit: cover;
    object-position: top center;
    box-sizing: border-box;
}

.preview-image.loaded {
    opacity: 1;
}

.preview-image-fallback {
    width: 100%;
    min-height: 200px;
    background: var(--color-light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-pdf-footer {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 8px;
    padding: 4px 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    z-index: 10;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: none;
    will-change: transform;
}

.preview-pdf-footer::before {
    content: '';
    display: none;
}

.preview-pdf-footer::after {
    content: 'PDF Report';
    font-size: 15px;
    color: #222222;
    font-weight: 600;
    letter-spacing: 0.1px;
    text-transform: none;
    position: relative;
    z-index: 1;
    text-shadow: none;
}

.preview-image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-black54);
    font-size: 14px;
}

.preview-image-placeholder svg {
    color: var(--color-black54);
    opacity: 0.5;
}

/* Стили для текстовых комментариев со стримингом порциями */
.streaming-text-chunks {
    position: relative;
    font-size: 14px;
    line-height: 1.6;
    color: #374151;
    white-space: pre-wrap;
}

/* Стили для заголовков в AI сообщениях */
.ai-heading {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    margin: 16px 0 8px 0;
    line-height: 1.4;
}

.ai-heading:first-child {
    margin-top: 0;
}

/* Жирный текст в AI сообщениях */
.streaming-text-chunks strong {
    font-weight: 600;
    color: #1f2937;
}

/* Градиент для жирного текста */
strong .text-chunk-fade.streaming-gradient {
    background: linear-gradient(
        90deg,
        rgba(31, 41, 55, 1) 0%,
        rgba(31, 41, 55, 1) 25%,
        rgba(31, 41, 55, 0.85) 50%,
        rgba(31, 41, 55, 0.6) 75%,
        rgba(31, 41, 55, 0.3) 100%
    );
    background-size: 200% 100%;
    background-position: 100% 0;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: streamingGradientBold 1.5s ease-out forwards;
}

@keyframes streamingGradientBold {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: 0% 0;
    }
}

/* Эффект fade-in для каждой порции текста */
.text-chunk-fade {
    opacity: 0;
    transition: opacity 0.15s ease-out;
}

.text-chunk-fade.visible {
    opacity: 1;
}

/* Градиентный эффект стриминга как у AI */
.text-chunk-fade.streaming-gradient {
    position: relative;
    background: linear-gradient(
        90deg,
        rgba(55, 65, 81, 1) 0%,
        rgba(55, 65, 81, 1) 25%,
        rgba(55, 65, 81, 0.85) 50%,
        rgba(55, 65, 81, 0.6) 75%,
        rgba(55, 65, 81, 0.3) 100%
    );
    background-size: 200% 100%;
    background-position: 100% 0;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: streamingGradient 1.5s ease-out forwards;
    transition: opacity 0.5s ease-out;
}

@keyframes streamingGradient {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: 0% 0;
    }
}

@media (max-width: 767px) {
    .streaming-text-chunks {
        font-size: 12px;
        line-height: 1.5;
    }
    
    .ai-heading {
        font-size: 12px;
        font-weight: 700;
        margin: 12px 0 6px 0;
    }
    
    .ai-heading:first-child {
        margin-top: 0;
    }
}

/* ============================================
   FEATURES СЕКЦИЯ
   ============================================ */

.features {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 36px;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

@media (max-width: 767px) {
    .section-title {
        white-space: normal;
        font-size: 28px;
    }
}

@media (min-width: 768px) {
    .section-title {
        font-size: 48px;
    }
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-black54);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-text);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--color-light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-black87);
}

.feature-description {
    font-size: 15px;
    color: var(--color-black54);
    line-height: 1.6;
}

/* ============================================
   BENEFITS СЕКЦИЯ
   ============================================ */

.benefits {
    padding: var(--spacing-3xl) 0;
    background: transparent;
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .benefits-content {
        grid-template-columns: 1fr 1fr;
    }
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.benefit-number {
    font-size: 48px;
    font-weight: var(--font-weight-bold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    min-width: 60px;
}

.benefit-title {
    font-size: 22px;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--color-black87);
}

.benefit-description {
    font-size: 16px;
    color: var(--color-black54);
    line-height: 1.7;
}

.stats-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 56px;
    font-weight: var(--font-weight-bold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

/* Стили для значения с префиксом */
.stat-value:has(.stat-prefix) {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.stat-prefix {
    font-size: 16px;
    font-weight: var(--font-weight-medium);
    color: var(--color-black54);
    line-height: 1;
}

.stat-number {
    font-size: 56px;
    font-weight: var(--font-weight-bold);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.stat-icon svg {
    width: 48px;
    height: 48px;
}

.stat-label {
    font-size: 16px;
    color: var(--color-black54);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   CTA СЕКЦИЯ
   ============================================ */

.cta {
    padding: var(--spacing-3xl) 0;
}

.cta-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.cta-title {
    font-size: 32px;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (min-width: 768px) {
    .cta-title {
        font-size: 40px;
    }
}

.cta-description {
    font-size: 18px;
    color: var(--color-black54);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    justify-content: center;
    align-items: center;
}

@media (min-width: 768px) {
    .cta-buttons {
        flex-direction: row;
    }
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: var(--color-dark);
    color: var(--color-white);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    align-items: center;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-logo-img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.footer-logo-text {
    font-size: 20px;
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

@media (min-width: 768px) {
    .footer-links {
        flex-direction: row;
        gap: var(--spacing-lg);
    }
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--color-white);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.social-link img {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ============================================
   АДАПТИВНОСТЬ И АНИМАЦИИ
   ============================================ */

@media (max-width: 767px) {
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .cta-title {
        font-size: 24px;
    }
    
    .benefit-number {
        font-size: 36px;
    }
    
    .stat-value {
        font-size: 40px;
    }
}

/* Плавное появление элементов при скролле */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   ПОДДЕРЖКА RTL (АРАБСКИЙ ЯЗЫК)
   ============================================ */

body.rtl {
    direction: rtl;
    text-align: right;
}

body.rtl .nav-content {
    flex-direction: row-reverse;
}

body.rtl .nav-links {
    flex-direction: row-reverse;
}

body.rtl .language-switcher {
    margin-left: 0;
    margin-right: var(--spacing-md);
}

body.rtl .lang-dropdown {
    right: auto;
    left: 0;
}

body.rtl .hero-content {
    direction: rtl;
}

body.rtl .benefits-content {
    direction: rtl;
}

body.rtl .footer-content {
    flex-direction: row-reverse;
}

body.rtl .footer-links {
    flex-direction: row-reverse;
}

body.rtl .benefit-item {
    flex-direction: row-reverse;
}

body.rtl .btn {
    flex-direction: row-reverse;
}

body.rtl .message.user-message {
    justify-content: flex-start;
}

body.rtl .message.ai-message {
    justify-content: flex-end;
}

body.rtl .message-bubble {
    text-align: right;
}

/* Убраны лишние CSS анимации - используются только inline transitions для лучшей производительности */

/* Адаптация для арабского шрифта */
body.rtl {
    font-family: 'Cairo', 'Inter', sans-serif;
}

@media (max-width: 767px) {
    body.rtl .language-switcher {
        margin-right: var(--spacing-sm);
        margin-left: 0;
    }
}