/* Design System - Variables
   ========================================================================== */
:root {
    /* Brand Colors */
    --color-primary: #4f46e5;
    --color-primary-light: #6366f1;
    --color-primary-dark: #4338ca;
    --color-primary-alpha: rgba(79, 70, 229, 0.1);

    /* Neutrals */
    --color-background: #f9fafb;
    --color-surface: #ffffff;
    --color-surface-dark: #f3f4f6;
    --color-text: #111827;
    --color-text-light: #6b7280;
    --color-border: #e5e7eb;

    /* Message Colors */
    --color-user-message: var(--color-primary);
    --color-agent-message: #e9ecef;
    --color-message-text: #ffffff;
    --color-message-text-dark: #1f2937;

    /* Status Colors */
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-error-bg: #fef2f2;
    --color-success: #10b981;
    --color-success-light: #dcfce7;
    --color-success-bg: #f0fdf4;

    /* Elevation */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
        0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Animation */
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --container-max-width: 440px;
    --chat-max-width: 800px;
    --header-height: 60px;
    --input-height: 48px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

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

body {
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        sans-serif;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Auth Page Styles
   ========================================================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f6f7ff 0%, #f0f4ff 100%);
    padding: var(--spacing-lg);
}

.auth-container {
    width: 100%;
    max-width: var(--container-max-width);
    background: var(--color-surface);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transform: translateY(0);
    transition:
        transform var(--transition-base),
        box-shadow var(--transition-base);
}

.auth-container:hover {
    transform: translateY(-2px);
    box-shadow:
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.auth-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(
        135deg,
        var(--color-primary) 0%,
        var(--color-primary-dark) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--color-primary);
}

.auth-tabs {
    display: flex;
    background-color: var(--color-surface-dark);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: none;
    color: var(--color-text-light);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
    z-index: 1;
}

.auth-tab.active {
    color: var(--color-primary);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

/* Form Styles
   ========================================================================== */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-field {
    position: relative;
    width: 100%;
    margin: 0;
}

.form-label {
    display: block;
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.form-field input {
    width: 100%;
    height: var(--input-height);
    padding: 0 var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-base);
    background-color: var(--color-surface);
}

.form-field input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha);
    outline: none;
}

.form-field input.error {
    border-color: var(--color-error);
    background-color: var(--color-error-bg);
}

.form-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

/* Button Styles
   ========================================================================== */
.button,
.auth-submit,
.send-button {
    height: var(--input-height);
    padding: 0 var(--spacing-xl);
    background: linear-gradient(
        135deg,
        var(--color-primary) 0%,
        var(--color-primary-dark) 100%
    );
    color: var(--color-message-text);
    border: none;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-width: 100px;
    line-height: 1;
    white-space: nowrap;
    text-decoration: none;
}

.button:hover:not(:disabled),
.auth-submit:hover:not(:disabled),
.send-button:hover:not(:disabled) {
    background: linear-gradient(
        135deg,
        var(--color-primary-dark) 0%,
        var(--color-primary) 100%
    );
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.button:disabled,
.auth-submit:disabled,
.send-button:disabled {
    background: linear-gradient(135deg, #9ca3af 0%, #6b7280 100%);
    cursor: not-allowed;
    opacity: 0.7;
}

/* Loading State Styles
   ========================================================================== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.loading-spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    font-size: 0.925rem;
    font-weight: 500;
    color: var(--color-message-text);
}

/* Chat Container Styles
   ========================================================================== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height));
    max-width: var(--chat-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
}

/* Messages Container
   ========================================================================== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background-color: var(--color-background);
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-surface-dark);
}

.messages-container::-webkit-scrollbar {
    width: 6px;
}

.messages-container::-webkit-scrollbar-track {
    background: var(--color-surface-dark);
    border-radius: var(--radius-full);
}

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

/* Message Bubbles
   ========================================================================== */
.message {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    max-width: 80%;
    animation: messageSlide 0.3s ease-out;
    box-shadow: var(--shadow-sm);
    background: linear-gradient(
        135deg,
        var(--color-primary) 0%,
        var(--color-primary-dark) 100%
    );
    color: var(--color-message-text);
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
}

.user-message {
    margin-left: auto;
    background-color: var(--color-user-message);
    color: var(--color-message-text);
    border-bottom-right-radius: var(--spacing-xs);
}

.agent-message {
    margin-right: auto;
    background-color: var(--color-agent-message);
    color: var(--color-message-text-dark);
    border-bottom-left-radius: var(--spacing-xs);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.sender {
    font-weight: 600;
}

.timestamp {
    font-size: 0.75rem;
    opacity: 0.8;
}

.message-content {
    word-break: break-word;
    line-height: 1.5;
}

/* Chat Input Area
   ========================================================================== */
.chat-form {
    position: relative;
    margin-top: auto;
    padding: var(--spacing-lg);
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.input-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: var(--color-background);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-border);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: all var(--transition-base);
}

.input-container:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

.input-container .form-field {
    flex: 1;
    margin: 0;
}

.input-container input {
    width: 100%;
    height: var(--input-height);
    padding: 0 var(--spacing-md);
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--color-text);
}

.input-container input:focus {
    outline: none;
    box-shadow: none;
}

.input-container input::placeholder {
    color: var(--color-text-light);
}

/* Error Messages
   ========================================================================== */
.error-message {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid var(--color-error-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    animation: fadeIn 0.3s ease-out;
}

/* Accessibility
   ========================================================================== */
.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;
}

/* Animations
   ========================================================================== */
@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    .chat-container {
        height: calc(100vh - var(--header-height));
        padding: var(--spacing-md);
        margin: 0;
        border-radius: 0;
    }

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

    .message {
        max-width: 90%;
    }

    .input-container {
        padding: var(--spacing-xs);
    }

    .send-button {
        padding: 0 var(--spacing-lg);
    }
}

/* Dark Mode Support
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #1a1b1e;
        --color-surface: #2c2e33;
        --color-surface-dark: #242629;
        --color-text: #e4e5e7;
        --color-text-light: #a1a2a5;
        --color-border: #404348;
        --color-agent-message: #323438;
    }

    .input-container {
        background-color: var(--color-surface-dark);
    }

    .input-container input {
        color: var(--color-text);
    }

    .input-container input::placeholder {
        color: var(--color-text-light);
    }

    .agent-message {
        color: var(--color-text);
    }

    .message-header {
        color: var(--color-text-light);
    }
}

/* Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Main Navigation
   ========================================================================== */
.main-navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: center; /* Center the nav-content */
}

.main-navigation .nav-content {
    width: 100%;
    max-width: 720px;
    height: 100%;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
}

.main-navigation .branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.main-navigation .logo {
    height: 32px;
    width: auto;
}

.main-navigation .brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    background: linear-gradient(
        135deg,
        var(--color-primary) 0%,
        var(--color-primary-dark) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-navigation .nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
    list-style: none;
}

.main-navigation .nav-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: auto; /* Push to the right */
}

.main-navigation .nav-link {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.main-navigation .nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-alpha);
}

.main-navigation .nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-primary-alpha);
}

/* Navigation Buttons
   ========================================================================== */
.nav-button {
    height: 38px;
    padding: 0 var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: 2px solid transparent;
}

.logout-button {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.logout-button:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: var(--color-primary-alpha);
}

/* Responsive Navigation
   ========================================================================== */
@media (max-width: 768px) {
    .main-navigation .nav-content {
        padding: 0 var(--spacing-md);
    }

    .main-navigation .brand-name {
        font-size: 1.1rem;
    }

    .main-navigation .nav-links {
        gap: var(--spacing-md);
    }

    .nav-button {
        padding: 0 var(--spacing-md);
    }
}

/* Mobile Navigation Menu
   ========================================================================== */
@media (max-width: 640px) {
    .main-navigation .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-smooth);
    }

    .main-navigation .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-navigation .nav-link {
        width: 100%;
        padding: var(--spacing-md);
        text-align: center;
    }

    .mobile-menu-button {
        display: block;
        background: none;
        border: none;
        padding: var(--spacing-sm);
        cursor: pointer;
        color: var(--color-text);
    }

    .mobile-menu-button:hover {
        color: var(--color-primary);
    }

    .main-navigation .nav-group {
        width: auto;
        justify-content: flex-end;
    }
}

/* Dark Mode Navigation Adjustments
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    .main-navigation {
        background-color: var(--color-surface);
    }

    .logout-button {
        color: var(--color-text);
        border-color: var(--color-border);
    }

    .logout-button:hover {
        border-color: var(--color-primary);
        color: var(--color-primary);
    }
}

/* Submit Button
   ========================================================================== */
.submit-button {
    height: var(--input-height);
    padding: 0 var(--spacing-xl);
    background: linear-gradient(
        135deg,
        var(--color-success) 0%,
        var(--color-success) 100%
    );
    color: var(--color-message-text);
    border: none;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-width: 120px;
}

.submit-button:hover:not(:disabled) {
    background: linear-gradient(
        135deg,
        var(--color-success) 0%,
        var(--color-success-light) 100%
    );
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.submit-button:disabled {
    background: linear-gradient(135deg, #9ca3af 0%, #6b7280 100%);
    cursor: not-allowed;
    opacity: 0.7;
}

.submit-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-success-light);
}

/* Link Button
   ========================================================================== */
.link-button {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-radius: var(--radius-md);
}

.link-button:hover {
    background-color: var(--color-primary-alpha);
    color: var(--color-primary-dark);
    text-decoration: none;
}

.link-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

.link-button svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base);
}

.link-button:hover svg {
    transform: translateX(2px);
}

/* Message Label
   ========================================================================== */
.message-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    animation: fadeIn 0.3s ease-out;
}

.message-label.info {
    background-color: var(--color-primary-alpha);
    color: var(--color-primary-dark);
}

.message-label.success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.message-label.error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

.message-label svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Responsive Adjustments
   ========================================================================== */
@media (max-width: 768px) {
    .submit-button,
    .link-button {
        width: 100%;
        justify-content: center;
    }

    .message-label {
        padding: var(--spacing-sm);
        font-size: 0.8125rem;
    }
}

/* Dark Mode Adjustments
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    .link-button {
        color: var(--color-primary-light);
    }

    .link-button:hover {
        background-color: rgba(99, 102, 241, 0.15);
        color: var(--color-primary-light);
    }

    .message-label.info {
        background-color: rgba(99, 102, 241, 0.15);
        color: var(--color-primary-light);
    }

    .message-label.success {
        background-color: rgba(16, 185, 129, 0.15);
        color: var(--color-success-light);
    }

    .message-label.error {
        background-color: rgba(239, 68, 68, 0.15);
        color: var(--color-error-light);
    }
}