/* ==========================================================================
   AI Chat SPA - Styles
   Colors from: Стиль.pptx (ЛУКОЙЛ branding)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    /* Brand colors - ЛУКОЙЛ Цифровые поставки */
    --color-primary: #2C7AF3;
    --color-primary-dark: #1153BF;
    --color-primary-light: #E8F1FE;

    /* Header/Sidebar dark theme */
    --color-header-bg: #1D2229;
    --color-header-text: #FFFFFF;

    /* Neutral colors */
    --color-bg: #F8F9FA;
    --color-surface: #FFFFFF;
    --color-text: #1D2229;
    --color-text-secondary: #6C757D;
    --color-border: #DEE2E6;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Typography */
    --font-family: Arial, sans-serif;
    --font-family-heading: 'Arial Black', Arial, sans-serif;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;

    /* Layout */
    --header-height: 60px;
    --input-area-height: auto;
    --max-width: 900px;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   App Layout
   -------------------------------------------------------------------------- */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: var(--max-width);
    margin: 0 auto;
    background-color: var(--color-surface);
    box-shadow: var(--shadow-lg);
}

@media (min-width: 1024px) {
    .app {
        margin: var(--spacing-lg) auto;
        height: calc(100vh - var(--spacing-lg) * 2);
        border-radius: var(--radius-lg);
        overflow: hidden;
    }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-lg);
    background-color: var(--color-header-bg);
    flex-shrink: 0;
}

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

.header__icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.header__title {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-header-text);
}

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

.header__assistant-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-header-text);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    cursor: pointer;
    outline: none;
    transition: background-color 0.2s, border-color 0.2s;
}

.header__assistant-select:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
}

.header__assistant-select:focus {
    border-color: var(--color-primary);
    background-color: rgba(255, 255, 255, 0.2);
}

.header__assistant-select option {
    background-color: var(--color-header-bg);
    color: var(--color-header-text);
}

.header__new-chat {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: transparent;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.header__new-chat:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #FFFFFF;
}

.header__new-chat svg {
    width: 24px;
    height: 24px;
}

/* --------------------------------------------------------------------------
   Chat Area
   -------------------------------------------------------------------------- */
.chat {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat__messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Welcome message */
.chat__welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
    height: 100%;
}

.chat__welcome-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    opacity: 0.6;
}

.chat__welcome-icon svg {
    width: 100%;
    height: 100%;
}

.chat__welcome h2 {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.chat__welcome p {
    font-size: var(--font-size-md);
}

/* --------------------------------------------------------------------------
   Messages
   -------------------------------------------------------------------------- */
.message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    animation: messageIn 0.3s ease-out;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message--user {
    align-self: flex-end;
}

.message--assistant {
    align-self: flex-start;
}

.message__content {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message--user .message__content {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border-bottom-right-radius: var(--spacing-xs);
}

.message--user .message__content a {
    color: #FFFFFF;
    text-decoration: underline;
}

.message--assistant .message__content {
    background-color: var(--color-surface);
    border-bottom-left-radius: var(--spacing-xs);
}

.message--cancelled .message__content {
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    font-style: italic;
}

.message__time {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    padding: 0 var(--spacing-xs);
}

.message--user .message__time {
    text-align: right;
}

/* Message content HTML styling */
.message__content h1,
.message__content h2,
.message__content h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.message__content h1:first-child,
.message__content h2:first-child,
.message__content h3:first-child {
    margin-top: 0;
}

.message__content p {
    margin-bottom: var(--spacing-sm);
}

.message__content p:last-child {
    margin-bottom: 0;
}

.message__content ul,
.message__content ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.message__content li {
    margin-bottom: var(--spacing-xs);
}

.message__content a {
    color: var(--color-primary);
    text-decoration: none;
}

.message__content a:hover {
    text-decoration: underline;
}

.message__content code {
    background-color: var(--color-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.message__content pre {
    background-color: #1e1e1e;
    color: #d4d4d4;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.message__content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.message__content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-sm) 0;
}

.message__content th,
.message__content td {
    border: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    text-align: left;
}

.message__content th {
    background-color: var(--color-bg);
    font-weight: bold;
}

.message__content blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Loading indicator
   -------------------------------------------------------------------------- */
.message--loading {
    max-width: none;
}

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

.message--loading .message__content {
    position: relative;
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-right: calc(var(--spacing-lg) + 16px);
}

.loading-timer {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.loading-cancel {
    position: absolute;
    top: -8px;
    right: -8px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background-color: var(--color-text-secondary);
    color: white;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.loading-cancel:hover {
    background-color: #e53935;
    transform: scale(1.1);
}

.loading-cancel svg {
    width: 14px;
    height: 14px;
}

.loading-dots {
    display: flex;
    gap: 4px;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
    animation: loadingDot 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes loadingDot {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* --------------------------------------------------------------------------
   Input Area
   -------------------------------------------------------------------------- */
.input-area {
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.input-area__form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-area__wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    transition: border-color 0.2s;
}

.input-area__wrapper:focus-within {
    border-color: var(--color-primary);
}

.input-area__input {
    flex: 1;
    border: none;
    background: none;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--color-text);
    resize: none;
    outline: none;
    min-height: 24px;
    max-height: 150px;
    line-height: 1.5;
}

.input-area__input::placeholder {
    color: var(--color-text-secondary);
}

.input-area__submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-sm);
    background-color: var(--color-primary);
    color: white;
    cursor: pointer;
    transition: background-color 0.2s, opacity 0.2s;
    flex-shrink: 0;
}

.input-area__submit:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
}

.input-area__submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-area__submit svg {
    width: 24px;
    height: 24px;
}

.input-area__hint {
    font-size: 12px;
    color: var(--color-text-secondary);
    text-align: center;
}

/* --------------------------------------------------------------------------
   Toast notifications
   -------------------------------------------------------------------------- */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
    z-index: 1000;
    max-width: 90%;
}

.toast--visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast--error {
    background-color: var(--color-primary);
    color: white;
}

.toast__message {
    flex: 1;
}

.toast__close {
    background: none;
    border: none;
    color: inherit;
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
}

.toast__close:hover {
    opacity: 1;
}

/* --------------------------------------------------------------------------
   Scrollbar styling
   -------------------------------------------------------------------------- */
.chat__messages::-webkit-scrollbar {
    width: 8px;
}

.chat__messages::-webkit-scrollbar-track {
    background: transparent;
}

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

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

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 600px) {
    .header__title {
        font-size: var(--font-size-sm);
    }

    .header__assistant-select {
        font-size: 12px;
        padding: 4px 6px;
    }

    .message {
        max-width: 95%;
    }

    .input-area__hint {
        display: none;
    }
}