/* 0702 - Enterprise AI Platform */
/* Professional Chat Interface */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Brand Colors */
    --color-brand: #C2410C;
    --color-brand-light: #EA580C;
    --color-brand-lighter: #FB923C;
    --color-brand-subtle: #FFF7ED;
    --color-brand-bg: #FFFBEB;
    
    /* Neutral Palette */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #F8FAFC;
    --color-bg-tertiary: #F1F5F9;
    --color-bg-hover: #E2E8F0;
    --color-bg-input: #ffffff;
    --color-bg-dark: #431407;
    
    --color-text-primary: #0F172A;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94A3B8;
    --color-text-inverse: #ffffff;
    
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --color-border-focus: #EA580C;
    
    --color-accent: #EA580C;
    --color-accent-hover: #C2410C;
    --color-accent-light: #FFF7ED;
    
    --color-success: #059669;
    --color-error: #DC2626;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.03);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.06), 0 1px 2px -1px rgb(0 0 0 / 0.06);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
    --shadow-input: 0 1px 2px 0 rgb(0 0 0 / 0.04);
    --shadow-input-focus: 0 0 0 3px rgba(234, 88, 12, 0.12);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.9375rem;
    --font-size-lg: 1.0625rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.625rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Layout */
    --max-width-chat: 48rem;
    --header-height: 3.25rem;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    height: 100vh;
    overflow: hidden;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

textarea {
    font-family: inherit;
    resize: none;
}

/* ============================================
   Layout
   ============================================ */
.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    background: var(--color-bg-primary);
}

/* Centered layout when no messages */
.main-content:not(.has-messages) .chat-area {
    display: none;
}

.main-content:not(.has-messages) .input-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: transparent;
    padding-bottom: var(--spacing-12);
}

.main-content:not(.has-messages) .input-container {
    width: 100%;
}

/* ============================================
   Header
   ============================================ */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-5);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.brand-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Header Orbital Logo (compact) */
.brand-orbital {
    position: relative;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-ring {
    position: absolute;
    border-radius: 50%;
    border: 1.5px solid transparent;
}

.brand-ring-1 {
    width: 26px;
    height: 26px;
    border-top-color: var(--color-brand-light);
    border-right-color: rgba(234, 88, 12, 0.3);
    animation: spin1 3s linear infinite;
}

.brand-ring-2 {
    width: 18px;
    height: 18px;
    border-bottom-color: var(--color-brand-lighter);
    border-left-color: rgba(251, 146, 60, 0.3);
    animation: spin2 2s linear infinite reverse;
}

.brand-nucleus {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 35%, #ffffff, var(--color-brand-lighter) 50%, var(--color-brand));
    box-shadow: 0 0 6px rgba(234, 88, 12, 0.8);
    animation: pulse 2s ease-in-out infinite;
    z-index: 10;
}

.brand-name {
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    letter-spacing: -0.025em;
    line-height: 1;
}

.brand-parent {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-tertiary);
    letter-spacing: 0.01em;
    line-height: 1;
}

.brand-badge {
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-brand);
    background: var(--color-brand-subtle);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    line-height: 1.3;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-success);
    box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.15);
}

.status-text {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-tertiary);
    letter-spacing: 0.01em;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 6px var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    line-height: 1.4;
}

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

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-primary {
    color: var(--color-text-inverse);
    background: var(--color-accent);
}

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

/* ============================================
   Chat Area
   ============================================ */
.chat-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    background: var(--color-bg-secondary);
}

.chat-container {
    max-width: var(--max-width-chat);
    margin: 0 auto;
    padding: var(--spacing-6) var(--spacing-4);
    display: flex;
    flex-direction: column;
}

/* ============================================
   Welcome Content
   ============================================ */
.welcome-content {
    display: none;
}

.main-content:not(.has-messages) .welcome-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.logo-wrap {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    margin-bottom: var(--spacing-10);
}

.welcome-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-2);
}

/* Welcome Orbital Logo (large) */
.orbital-container {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ring {
    position: absolute;
    border-radius: 50%;
    border: 1.5px solid transparent;
}

.ring-1 {
    width: 92px;
    height: 92px;
    border-top-color: var(--color-brand-light);
    border-right-color: rgba(234, 88, 12, 0.3);
    animation: spin1 3s linear infinite;
    box-shadow: 0 0 12px rgba(234, 88, 12, 0.3);
}

.ring-2 {
    width: 66px;
    height: 66px;
    border-bottom-color: var(--color-brand-lighter);
    border-left-color: rgba(251, 146, 60, 0.3);
    animation: spin2 2s linear infinite reverse;
    box-shadow: 0 0 12px rgba(251, 146, 60, 0.3);
}

.ring-3 {
    width: 44px;
    height: 44px;
    border-top-color: #FDBA74;
    border-right-color: rgba(253, 186, 116, 0.2);
    animation: spin1 1.4s linear infinite;
}

.nucleus {
    position: relative;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 35%, #ffffff, var(--color-brand-lighter) 40%, var(--color-brand));
    box-shadow: 0 0 20px rgba(234, 88, 12, 0.9), 0 0 40px rgba(234, 88, 12, 0.4);
    animation: pulse 2s ease-in-out infinite;
    z-index: 10;
}

/* Orbital Animations */
@keyframes spin1 {
    to { transform: rotate(360deg); }
}

@keyframes spin2 {
    to { transform: rotate(-360deg); }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(234, 88, 12, 0.9), 0 0 40px rgba(234, 88, 12, 0.4);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 30px rgba(234, 88, 12, 1), 0 0 60px rgba(234, 88, 12, 0.6);
        transform: scale(1.15);
    }
}

.welcome-brand {
    font-weight: 700;
    font-size: var(--font-size-3xl);
    color: var(--color-text-primary);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.welcome-brand .ket {
    font-weight: 300;
    color: var(--color-brand-light);
}

.welcome-equation {
    font-family: 'Times New Roman', Georgia, serif;
    font-size: var(--font-size-sm);
    font-style: italic;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
    opacity: 0.6;
    margin-top: -4px;
}

.welcome-equation sub {
    font-size: 0.7em;
}

.welcome-parent {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
}

.tagline {
    font-weight: 500;
    font-size: var(--font-size-sm);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-brand-light);
    margin-top: -2px;
}

.welcome-divider {
    width: 48px;
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-1) 0;
}

.welcome-subtitle {
    font-weight: 400;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    letter-spacing: 0.01em;
}

/* ============================================
   Messages
   ============================================ */
.message {
    display: flex;
    gap: var(--spacing-4);
    padding: var(--spacing-5) var(--spacing-4);
    animation: messageIn 0.25s ease-out;
    border-radius: var(--radius-xl);
}

.message.user {
    background: transparent;
}

.message.ai {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-xs);
    margin-bottom: var(--spacing-2);
}

.message + .message {
    margin-top: var(--spacing-1);
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #475569, #334155);
    color: white;
    border-radius: var(--radius-lg);
}

.message.ai .message-avatar {
    background: var(--color-bg-dark);
    border-radius: var(--radius-lg);
    padding: 4px;
}

/* AI Avatar Icon */
.avatar-orbital {
    position: relative;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid transparent;
}

.avatar-ring-1 {
    width: 30px;
    height: 30px;
    border-top-color: var(--color-brand-light);
    border-right-color: rgba(234, 88, 12, 0.3);
    animation: spin1 3s linear infinite;
}

.avatar-ring-2 {
    width: 20px;
    height: 20px;
    border-bottom-color: var(--color-brand-lighter);
    border-left-color: rgba(251, 146, 60, 0.3);
    animation: spin2 2s linear infinite reverse;
}

.avatar-nucleus {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 35%, #ffffff, var(--color-brand-lighter) 50%, var(--color-brand));
    box-shadow: 0 0 8px rgba(234, 88, 12, 0.8);
    animation: pulse 2s ease-in-out infinite;
    z-index: 10;
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-sender {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.message-text {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-primary);
    white-space: pre-wrap;
    word-break: break-word;
}

.message-text p {
    margin-bottom: var(--spacing-3);
}

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

.message-timestamp {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-2);
}

/* ============================================
   Typing Indicator
   ============================================ */
.message.ai.typing {
    padding: var(--spacing-4) var(--spacing-4);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-xs);
    border-radius: var(--radius-xl);
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-1) var(--spacing-2);
}

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

/* Hide old orbital elements */
.typing-ring, .typing-ring-1, .typing-ring-2, .typing-ring-3, .typing-nucleus {
    display: none;
}

/* Enterprise typing dots via indicator container */
.typing-indicator::after {
    content: 'Thinking...';
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
    animation: typingFade 1.5s ease-in-out infinite;
}

@keyframes typingFade {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* ============================================
   Input Area
   ============================================ */
.input-area {
    flex-shrink: 0;
    padding: var(--spacing-4) var(--spacing-4) var(--spacing-5);
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border-light);
    transition: all var(--transition-slow);
}

.main-content:not(.has-messages) .input-area {
    background: transparent;
    border-top: none;
}

.input-container {
    max-width: var(--max-width-chat);
    margin: 0 auto;
}

.input-box {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-input);
    transition: all var(--transition-fast);
}

.input-box:focus-within {
    border-color: var(--color-border-focus);
    box-shadow: var(--shadow-input-focus);
}

.input-box textarea {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    max-height: 200px;
    padding: var(--spacing-1) 0;
}

.input-box textarea::placeholder {
    color: var(--color-text-tertiary);
}

.send-button {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background: var(--color-accent-hover);
}

.send-button:disabled {
    background: var(--color-bg-tertiary);
    color: var(--color-text-tertiary);
    cursor: not-allowed;
}

.input-hint {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-2);
}

/* ============================================
   Scrollbar
   ============================================ */
.chat-area::-webkit-scrollbar {
    width: 6px;
}

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

.chat-area::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 640px) {
    .header {
        padding: 0 var(--spacing-3);
    }
    
    .brand-name {
        font-size: var(--font-size-base);
    }
    
    .brand-badge {
        display: none;
    }

    .header-status .status-text {
        display: none;
    }
    
    .btn span {
        display: none;
    }
    
    .chat-container {
        padding: var(--spacing-4) var(--spacing-3);
    }
    
    .message {
        gap: var(--spacing-3);
    }
    
    .input-area {
        padding: var(--spacing-3);
    }
    
    .input-box {
        padding: var(--spacing-2) var(--spacing-3);
    }

    .welcome-brand {
        font-size: var(--font-size-2xl);
    }
}

/* ============================================
   Utilities
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}