/* ===================================
   CSS Custom Properties (Design System)
   =================================== */
:root {
    /* Colors - Medical/Health Theme */
    --color-primary: #00B6E2;
    --color-primary-dark: #0682BB;
    --color-accent: #10B981;
    --color-accent-light: #CCDC29;
    --color-background: #0a0e27;
    --color-background-light: #1a1f3a;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    --color-text: #ffffff;
    --color-text-secondary: #a0aec0;
    --color-text-muted: #718096;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-error: #ef4444;
    --color-success: #10b981;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00B6E2 0%, #0682BB 100%);
    --gradient-background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 50%, #0f1629 100%);
    --gradient-accent: linear-gradient(135deg, #10B981 0%, #059669 100%);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(0, 182, 226, 0.3);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: #333333;
    background: #00B6E2;
    background-attachment: fixed;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   App Container
   =================================== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100vw;
    overflow-x: hidden;
}

/* ===================================
   Header
   =================================== */
.app-header {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.app-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0;
}

.title-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px rgba(0, 182, 226, 0.5));
    display: inline-block;
    vertical-align: middle;
    margin-right: var(--spacing-sm);
}

.app-subtitle {
    color: #FFFFFF;
    font-size: var(--font-size-lg);
    font-weight: 400;
}

/* ===================================
   Main Chat Container
   =================================== */
.chat-container {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow: hidden;
}

.chat-wrapper {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    height: calc(100vh - 280px);
}

/* ===================================
   Messages Container
   =================================== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    background: #ffffff;
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* ===================================
   Welcome Message
   =================================== */
.welcome-message {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    animation: fadeInUp 0.6s ease;
}

.welcome-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 20px rgba(16, 185, 129, 0.5));
}

.welcome-message h2 {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: #0682BB;
}

.welcome-message>p {
    color: #666666;
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

/* ===================================
   Quick Start Section (Outside Chat)
   =================================== */
.quick-start-section {
    padding: var(--spacing-sm) 0;
    margin: 0;
}

.quick-start-label {
    color: #FFFFFF;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.symptom-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.chip {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: #ffffff;
    border: 2px solid #00B6E2;
    border-radius: var(--radius-full);
    color: #00B6E2;
    font-size: var(--font-size-sm);
    font-weight: 600;
    font-family: var(--font-primary);
    transition: all var(--transition-base);
    cursor: pointer;
}

.chip:hover {
    background: #00B6E2;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 182, 226, 0.3);
}

.chip:active {
    transform: translateY(0);
}

/* ===================================
   Chat Messages
   =================================== */
.message {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.4s ease;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.message.user .message-avatar {
    background: var(--gradient-primary);
}

.message.assistant .message-avatar {
    background: var(--gradient-accent);
}

.message-content {
    max-width: 75%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.message.user .message-content {
    background: rgba(0, 182, 226, 0.15);
    border: 1px solid rgba(0, 182, 226, 0.3);
    border-bottom-right-radius: var(--radius-sm);
}

.message.assistant .message-content {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-bottom-left-radius: var(--radius-sm);
}

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

.message-text {
    color: #333333;
    line-height: 1.6;
    word-wrap: break-word;
}

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

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

.message-text strong {
    color: var(--color-primary);
    font-weight: 600;
}

.message-text ul,
.message-text ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

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

/* ===================================
   Typing Indicator
   =================================== */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0 var(--spacing-lg) var(--spacing-md);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-xl);
    width: fit-content;
    animation: fadeIn 0.3s ease;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    animation: typingAnimation 1.4s infinite;
}

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

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

.typing-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-left: var(--spacing-sm);
}

/* ===================================
   Input Container
   =================================== */
.input-container {
    background: #ffffff;
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(0, 0, 0, 0.1);
    padding: var(--spacing-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-base);
}

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

.input-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.message-input {
    flex: 1;
    background: #f5f5f5;
    border: 1px solid #dddddd;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    color: #333333;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    resize: none;
    max-height: 150px;
    transition: all var(--transition-base);
}

.message-input:focus {
    outline: none;
    background: #ffffff;
    border-color: var(--color-primary);
}

.message-input::placeholder {
    color: #999999;
}

.send-button {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.send-button:active:not(:disabled) {
    transform: translateY(0);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-hint {
    margin-top: var(--spacing-sm);
    color: #999999;
    font-size: var(--font-size-xs);
    text-align: center;
}

/* ===================================
   Footer
   =================================== */
.app-footer {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.03);
    border-top: 1px solid var(--color-border);
}

.disclaimer {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    color: #FFFFFF;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.disclaimer strong {
    color: #CCDC29;
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes typingAnimation {

    0%,
    60%,
    100% {
        transform: translateY(0);
        opacity: 0.7;
    }

    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.25rem;
        --spacing-xl: 1.5rem;
    }

    .app-header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .app-title {
        font-size: var(--font-size-lg);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0;
        margin-bottom: 0;
    }

    .title-icon {
        font-size: 1.5rem;
        margin-right: 0;
        margin-bottom: 0;
    }

    .chat-container {
        padding: var(--spacing-md);
    }

    .chat-wrapper {
        height: calc(100vh - 320px);
    }

    .messages-container {
        padding: var(--spacing-md);
    }

    .message-content {
        max-width: 85%;
    }

    .welcome-message {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .welcome-icon {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .message-content {
        max-width: 90%;
    }

    .symptom-chips {
        flex-direction: column;
        align-items: stretch;
    }

    .chip {
        text-align: center;
    }
}

/* ===================================
   Clinic Info Header
   =================================== */
.clinic-info {
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    animation: fadeIn 0.5s ease;
}

.clinic-details {
    text-align: left;
}

.clinic-name {
    color: #FFFFFF;
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: 0;
}

.dentist-name {
    color: #FFFFFF;
    font-size: var(--font-size-base);
    font-weight: 600;
}

.clinic-contact {
    text-align: right;
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-xs);
}

.clinic-phone {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.clinic-address {
    max-width: 250px;
    line-height: 1.4;
}

@media (max-width: 768px) {
    .clinic-info {
        flex-direction: column;
        text-align: center;
        justify-content: center;
    }

    .clinic-details,
    .clinic-contact {
        text-align: center;
    }

    .clinic-address {
        margin: 0 auto;
    }
}