/* ============================================
   СОВРЕМЕННЫЙ ВЕБ-ИНТЕРФЕЙС ЛАСТОЧКА
   ============================================ */

:root {
    /* Цветовая палитра - светлая тема */
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-primary: #20808d;
    --color-primary-hover: #1a6b76;
    --color-primary-light: #e0f2f4;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --color-user-msg: #20808d;
    --color-assistant-msg: #f9fafb;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.12);
    
    /* Градиенты */
    --gradient-primary: linear-gradient(135deg, #20808d 0%, #1a6b76 100%);
    --gradient-bg: linear-gradient(135deg, #fafafa 0%, #e0f2f4 100%);
    
    /* Радиусы */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Отступы */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Тени */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
}

/* Темная тема */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-surface: #1e293b;
        --color-surface-elevated: #334155;
        --color-text: #f1f5f9;
        --color-text-secondary: #94a3b8;
        --color-primary: #32b8c6;
        --color-primary-hover: #38d9e9;
        --color-primary-light: #1e3a3f;
        --color-border: #334155;
        --color-border-light: #1e293b;
        --color-error: #f87171;
        --color-error-bg: #7f1d1d;
        --color-user-msg: #32b8c6;
        --color-assistant-msg: #1e293b;
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-shadow-hover: rgba(0, 0, 0, 0.4);
        
        --gradient-primary: linear-gradient(135deg, #32b8c6 0%, #38d9e9 100%);
        --gradient-bg: linear-gradient(135deg, #0f172a 0%, #1e3a3f 100%);
    }
}

/* ============================================
   БАЗОВЫЕ СТИЛИ
   ============================================ */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
}

/* ============================================
   СТРАНИЦА ВХОДА
   ============================================ */

.login-page {
    background: var(--gradient-bg);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(32, 128, 141, 0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-30px, -30px) rotate(180deg); }
}

.login-container {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease;
    border: 1px solid var(--color-border);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card .logo {
    text-align: center;
    font-size: 5em;
    margin-bottom: var(--spacing-sm);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.login-card h1 {
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 15px;
    font-weight: 400;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.form-group label {
    color: var(--color-text);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.2px;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    background: var(--color-bg);
    color: var(--color-text);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-light);
    background: var(--color-surface);
}

.form-group input::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.6;
}

.btn-primary {
    width: 100%;
    padding: 16px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before {
    width: 300px;
    height: 300px;
}

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

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

.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-error);
    padding: 12px 16px;
    background: var(--color-error-bg);
    border-radius: var(--radius-md);
    font-size: 14px;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.info-text {
    margin-top: var(--spacing-lg);
    text-align: center;
    font-size: 13px;
    color: var(--color-text-secondary);
    opacity: 0.7;
}

/* ============================================
   СТРАНИЦА ЧАТА
   ============================================ */

.chat-page {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    background: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(30, 41, 59, 0.9);
    }
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header .logo {
    font-size: 32px;
    animation: none;
}

.header h1 {
    color: var(--color-primary);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.header-right {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.user-info {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.btn-secondary,
.btn-outline {
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: 2px solid transparent;
}

.btn-secondary {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-color: var(--color-primary-light);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-outline:hover {
    background: var(--color-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

.message {
    max-width: 75%;
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    line-height: 1.6;
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    word-wrap: break-word;
    position: relative;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message.user {
    background: var(--gradient-primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    box-shadow: var(--shadow-md);
}

.message.assistant {
    background: var(--color-assistant-msg);
    color: var(--color-text);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.message a {
    color: var(--color-primary);
    text-decoration: underline;
    word-break: break-all;
    transition: opacity 0.2s;
}

.message a:hover {
    opacity: 0.8;
}

.message.user a {
    color: white;
    font-weight: 500;
}

.message-time {
    font-size: 11px;
    opacity: 0.6;
    margin-top: 8px;
    display: block;
}

.typing-indicator {
    display: none;
    align-self: flex-start;
    padding: 16px 20px;
    background: var(--color-assistant-msg);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    margin-left: var(--spacing-md);
}

.typing-indicator.active {
    display: flex;
    gap: 6px;
    align-items: center;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.3;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

.input-container {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -2px 8px var(--color-shadow);
    position: sticky;
    bottom: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

@media (prefers-color-scheme: dark) {
    .input-container {
        background: rgba(30, 41, 59, 0.95);
    }
}

.input-wrapper {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

#messageInput {
    flex: 1;
    padding: 14px 18px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    background: var(--color-bg);
    color: var(--color-text);
    resize: none;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 52px;
    max-height: 150px;
    line-height: 1.5;
}

#messageInput:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-light);
    background: var(--color-surface);
}

#messageInput::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.6;
}

#messageInput:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-send {
    padding: 14px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
    height: 52px;
}

.btn-send:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-lg);
}

.btn-send:active:not(:disabled) {
    transform: translateY(0) scale(1);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.empty-state {
    text-align: center;
    padding: 80px var(--spacing-md);
    color: var(--color-text-secondary);
    margin: auto;
}

.empty-state .icon {
    font-size: 72px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.6;
    animation: float 3s ease-in-out infinite;
}

.empty-state h3 {
    font-size: 22px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 600;
}

.empty-state p {
    font-size: 15px;
    opacity: 0.7;
}

/* ============================================
   АДАПТИВНОСТЬ
   ============================================ */

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .header-right {
        flex-wrap: wrap;
        width: 100%;
        justify-content: flex-end;
    }
    
    .user-info {
        display: none;
    }
    
    .message {
        max-width: 85%;
    }
    
    .chat-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .input-container {
        padding: var(--spacing-md);
    }
    
    .login-card {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .login-card .logo {
        font-size: 4em;
    }
    
    .login-card h1 {
        font-size: 28px;
    }
    
    .message {
        max-width: 90%;
        padding: 14px 16px;
    }
    
    .btn-secondary,
    .btn-outline {
        padding: 8px 14px;
        font-size: 13px;
    }
}

/* ============================================
   УЛУЧШЕНИЯ ДЛЯ ДОСТУПНОСТИ
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Фокус для клавиатурной навигации */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}