/* ===== CSS Variables ===== */
:root {
    /* Warm, sophisticated color palette */
    --color-primary: #D4845C;
    --color-primary-light: #E9A17C;
    --color-primary-dark: #B86F4D;

    --color-bg-primary: #FAF8F5;
    --color-bg-secondary: #FFF9F4;
    --color-bg-tertiary: #FFFFFF;

    --color-text-primary: #2C2416;
    --color-text-secondary: #6B5D4F;
    --color-text-tertiary: #9A8A7A;

    --color-border: #E8DFD6;
    --color-border-light: #F2EDE7;

    --color-success: #7FA97F;
    --color-error: #C07A7A;
    --color-warning: #D4A574;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(44, 36, 22, 0.04);
    --shadow-md: 0 4px 16px rgba(44, 36, 22, 0.08);
    --shadow-lg: 0 8px 32px rgba(44, 36, 22, 0.12);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Fonts */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

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

    /* Emotion-based Avatar Variables (dynamically updated by JS) */
    --emotion-hue: 18;           /* Base hue for coral color */
    --emotion-saturation: 60%;   /* Base saturation */
    --emotion-lightness: 62%;    /* Base lightness */
    --emotion-pulse-speed: 2s;   /* Pulse animation speed */
    --emotion-glow-intensity: 0; /* Glow effect intensity */
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Header ===== */
.header {
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.logo .company {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.settings-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* ===== Main Content ===== */
.main {
    min-height: calc(100vh - 80px);
    padding: var(--spacing-xl) 0;
}

/* ===== Welcome Screen ===== */
.welcome-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
    text-align: center;
}

.welcome-content {
    max-width: 600px;
}

.ai-avatar {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
}

.avatar-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg,
        hsl(var(--emotion-hue), var(--emotion-saturation), var(--emotion-lightness)),
        hsl(var(--emotion-hue), var(--emotion-saturation), calc(var(--emotion-lightness) + 10%))
    );
    border-radius: 50%;
    box-shadow: var(--shadow-lg),
        0 0 calc(20px * var(--emotion-glow-intensity))
        hsla(var(--emotion-hue), var(--emotion-saturation), var(--emotion-lightness), var(--emotion-glow-intensity));
    transition: all 0.8s ease;
}

.pulse-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border: 2px solid hsl(var(--emotion-hue), var(--emotion-saturation), calc(var(--emotion-lightness) + 10%));
    border-radius: 50%;
    animation: pulse var(--emotion-pulse-speed) ease-in-out infinite;
    opacity: 0;
    transition: border-color 0.8s ease, animation-duration 0.8s ease;
}

.pulse-ring.delay-1 {
    animation-delay: 0.5s;
}

.pulse-ring.delay-2 {
    animation-delay: 1s;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0;
    }
}

.welcome-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.welcome-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.start-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

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

.start-btn svg {
    transition: transform var(--transition-base);
}

.start-btn:hover svg {
    transform: translateX(4px);
}

/* ===== Chat Interface ===== */
.chat-interface {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 140px);
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: 16px 16px 0 0;
    border: 1px solid var(--color-border);
    border-bottom: none;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.status-indicator:hover {
    background: rgba(233, 213, 183, 0.15);
    color: var(--color-text-primary);
}

.status-indicator.recording {
    background: rgba(242, 158, 109, 0.15);
    color: var(--color-primary);
}

.status-indicator.recording .status-dot {
    background: var(--color-primary);
    animation: pulse-dot 1s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.tools-used {
    display: flex;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
}

.tool-badge {
    padding: 4px 8px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-tertiary);
}

/* ===== Chat Messages ===== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.4s ease;
}

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

.message-avatar {
    flex-shrink: 0;
}

.avatar-small {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.message.user .avatar-small {
    background: linear-gradient(135deg, var(--color-text-secondary), var(--color-text-tertiary));
}

.message-content {
    flex: 1;
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    border: none;
}

.message-content p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

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

.message-tools {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ===== Chat Input ===== */
.chat-input-container {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 0 0 16px 16px;
    padding: var(--spacing-md);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-sm);
    transition: border-color var(--transition-fast);
}

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

.voice-btn {
    position: relative;
    flex-shrink: 0;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

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

.voice-btn.recording {
    color: var(--color-error);
}

.recording-indicator {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 8px;
    color: var(--color-error);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.voice-btn.recording .recording-indicator {
    opacity: 1;
    animation: blink 1s ease-in-out infinite;
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    resize: none;
    min-height: 24px;
    max-height: 120px;
    line-height: 1.5;
}

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

.send-btn {
    flex-shrink: 0;
    background: var(--color-primary);
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.send-btn:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(44, 36, 22, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--color-bg-tertiary);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
}

.setting-group {
    margin-bottom: var(--spacing-lg);
}

.setting-group label {
    display: block;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.setting-group input[type="password"],
.setting-group input[type="text"],
.setting-group select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    transition: all var(--transition-fast);
}

.setting-group input:focus,
.setting-group select:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(212, 132, 92, 0.1);
}

.setting-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.setting-group small a {
    color: var(--color-primary);
    text-decoration: none;
}

.setting-group small a:hover {
    text-decoration: underline;
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Slider styles */
.setting-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.setting-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.setting-group input[type="range"]:hover::-webkit-slider-thumb {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.setting-group input[type="range"]:hover::-moz-range-thumb {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.setting-group input[type="range"]:active::-webkit-slider-thumb {
    background: var(--color-primary-dark);
    transform: scale(1.2);
}

.setting-group input[type="range"]:active::-moz-range-thumb {
    background: var(--color-primary-dark);
    transform: scale(1.2);
}

.setting-group label span {
    float: right;
    color: var(--color-primary);
    font-weight: 600;
}

.modal-footer {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

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

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

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

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

.btn-danger {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: var(--color-error);
    color: white;
    width: 100%;
    margin-top: var(--spacing-xs);
}

.btn-danger:hover {
    background: #A05555;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(192, 122, 122, 0.2);
}

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

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(250, 248, 245, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    animation: spin 1s linear infinite;
}

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

.loading-spinner p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Scrollbar ===== */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

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

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

/* ===== Responsive Design ===== */

/* Tablet */
@media (max-width: 1024px) {
    .container {
        max-width: 100%;
        padding: 0 var(--spacing-sm);
    }

    .chat-interface {
        height: calc(100vh - 90px);
    }
}

/* Mobile */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .header {
        padding: var(--spacing-sm) 0;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .logo .company {
        font-size: 0.75rem;
    }

    .settings-btn {
        width: 36px;
        height: 36px;
    }

    .welcome-title {
        font-size: 1.75rem;
    }

    .welcome-subtitle {
        font-size: 0.95rem;
    }

    .start-btn {
        padding: 0.875rem 1.75rem;
        font-size: 0.95rem;
    }

    .chat-interface {
        height: calc(100vh - 80px);
    }

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

    .status-indicator span {
        font-size: 0.85rem;
    }

    .chat-messages {
        padding: var(--spacing-sm);
        max-height: calc(100vh - 250px);
    }

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

    .message-content {
        padding: var(--spacing-sm);
        font-size: 0.95rem;
    }

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

    .input-wrapper {
        gap: 0.5rem;
    }

    .voice-btn, .send-btn {
        width: 40px;
        height: 40px;
        min-width: 40px;
    }

    .message-input {
        font-size: 0.95rem;
        padding: 0.75rem;
    }

    .input-footer {
        font-size: 0.8rem;
    }

    .modal-content {
        width: 95%;
        max-width: none;
        margin: var(--spacing-sm);
        max-height: calc(100vh - 2rem);
        overflow-y: auto;
    }

    .modal-header h3 {
        font-size: 1.25rem;
    }

    .setting-group {
        margin-bottom: var(--spacing-md);
    }

    .setting-group label {
        font-size: 0.9rem;
    }

    .notification {
        width: calc(100% - 2rem);
        max-width: none;
        left: 1rem;
        right: 1rem;
        transform: translateX(0);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    html {
        font-size: 13px;
    }

    .container {
        padding: 0 0.75rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .welcome-title {
        font-size: 1.5rem;
    }

    .ai-avatar {
        width: 100px;
        height: 100px;
    }

    .avatar-core {
        width: 40px;
        height: 40px;
    }

    .start-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    .chat-messages {
        max-height: calc(100vh - 220px);
    }

    .message-content {
        padding: 0.75rem;
    }

    .voice-btn, .send-btn {
        width: 36px;
        height: 36px;
        min-width: 36px;
    }

    .input-footer .tip {
        font-size: 0.75rem;
    }

    .modal-body {
        padding: var(--spacing-sm);
    }

    .modal-footer {
        padding: var(--spacing-sm);
        gap: 0.5rem;
    }

    .btn-primary, .btn-secondary, .btn-danger {
        padding: 0.625rem 1.25rem;
        font-size: 0.85rem;
    }
}

/* Landscape orientation for mobile */
@media (max-height: 600px) and (orientation: landscape) {
    .welcome-screen {
        padding: var(--spacing-md) 0;
    }

    .ai-avatar {
        width: 80px;
        height: 80px;
        margin-bottom: var(--spacing-sm);
    }

    .welcome-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }

    .welcome-subtitle {
        margin-bottom: var(--spacing-sm);
    }

    .chat-messages {
        max-height: calc(100vh - 180px);
    }
}

/* Touch-friendly adjustments */
@media (hover: none) and (pointer: coarse) {
    .voice-btn, .send-btn, .settings-btn, .close-btn {
        min-width: 44px;
        min-height: 44px;
    }

    .checkbox-label {
        padding: 0.75rem 0;
    }

    input[type="range"] {
        height: 40px;
    }
}

/* ===== Chat History Sidebar ===== */
.sidebar-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-right: var(--spacing-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    color: var(--color-primary);
}

/* Chat History Bottom Sheet - Samantha-inspired Design */
.chat-sidebar {
    position: fixed;
    bottom: -75vh;
    left: 0;
    right: 0;
    width: 100%;
    height: 75vh;
    max-height: 75vh;
    background: linear-gradient(to bottom,
        rgba(255, 252, 247, 0.98),
        rgba(255, 252, 247, 0.95));
    backdrop-filter: blur(20px);
    box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.12),
                0 -2px 8px rgba(0, 0, 0, 0.08);
    z-index: 200;
    transition: bottom 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    border-radius: 32px 32px 0 0;
    overflow: hidden;
}

.chat-sidebar.open {
    bottom: 0;
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg) 0;
    border-bottom: 1px solid rgba(233, 213, 183, 0.3);
    position: relative;
}

/* Drag Handle */
.sidebar-header::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 4px;
    background: rgba(233, 213, 183, 0.5);
    border-radius: 2px;
    transition: all 0.2s ease;
}

.sidebar-header:hover::before {
    background: var(--color-primary);
    width: 64px;
}

/* Sidebar Tabs */
.sidebar-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.sidebar-tab {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-tertiary);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.6;
}

.sidebar-tab svg {
    flex-shrink: 0;
}

.sidebar-tab:hover {
    color: var(--color-primary);
    opacity: 0.9;
}

.sidebar-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    opacity: 1;
}

.sidebar-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-text-tertiary);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    opacity: 0.6;
}

.sidebar-close:hover {
    color: var(--color-primary);
    background: rgba(233, 213, 183, 0.2);
    opacity: 1;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-xl);
    scroll-behavior: smooth;
    display: none;
}

.sidebar-content.active {
    display: block;
}

/* Custom scrollbar for sidebar */
.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: rgba(233, 213, 183, 0.3);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: rgba(233, 213, 183, 0.5);
}

.history-empty {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xl);
}

.history-empty p {
    font-size: 1rem;
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
    opacity: 0.8;
}

.history-empty small {
    font-size: 0.875rem;
    opacity: 0.6;
    line-height: 1.6;
}

.history-date-group {
    margin-bottom: var(--spacing-xl);
}

.history-date {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xs);
    opacity: 0.7;
}

.history-item {
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.6),
        rgba(255, 252, 247, 0.4));
    border: 1px solid rgba(233, 213, 183, 0.25);
    border-radius: 16px;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.history-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg,
        rgba(242, 158, 109, 0.05),
        rgba(233, 213, 183, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.history-item:hover {
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.8),
        rgba(255, 252, 247, 0.6));
    border-color: rgba(242, 158, 109, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(242, 158, 109, 0.1);
}

.history-item:hover::before {
    opacity: 1;
}

.history-item-role {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.375rem;
    letter-spacing: 0.03em;
    opacity: 0.9;
}

.history-item-preview {
    font-size: 0.9375rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    white-space: normal;
}

/* Memories Section */
.memories-empty {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xl);
}

.memories-empty p {
    font-size: 1rem;
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
    opacity: 0.8;
}

.memories-empty small {
    font-size: 0.875rem;
    opacity: 0.6;
    line-height: 1.6;
}

.memory-category-group {
    margin-bottom: var(--spacing-xl);
}

.memory-category {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xs);
    opacity: 0.7;
}

.memory-item {
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.5),
        rgba(255, 248, 238, 0.4));
    border: 1px solid rgba(233, 213, 183, 0.25);
    border-left: 3px solid var(--color-primary);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.memory-item:hover {
    background: linear-gradient(135deg,
        rgba(255, 255, 255, 0.7),
        rgba(255, 248, 238, 0.6));
    border-left-color: hsl(calc(var(--emotion-hue) + 10), 70%, 60%);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(242, 158, 109, 0.15);
}

.memory-content {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.memory-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    align-items: center;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    opacity: 0.7;
}

.memory-importance {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.importance-stars {
    color: var(--color-primary);
}

.memory-timestamp {
    opacity: 0.6;
}

.memory-access-count {
    opacity: 0.6;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: linear-gradient(to bottom,
        rgba(44, 36, 22, 0.3),
        rgba(44, 36, 22, 0.5));
    backdrop-filter: blur(4px);
    z-index: 199;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Mobile adjustments for bottom sheet */
@media (max-width: 768px) {
    .chat-sidebar {
        height: 80vh;
        max-height: 80vh;
        bottom: -80vh;
        border-radius: 24px 24px 0 0;
    }

    .sidebar-content {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .chat-sidebar {
        height: 85vh;
        max-height: 85vh;
        bottom: -85vh;
        border-radius: 20px 20px 0 0;
    }

    .sidebar-header h2 {
        font-size: 1rem;
    }

    .history-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* ===== Voice Visualization - Samantha-inspired ===== */
.voice-visualization {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: linear-gradient(135deg,
        rgba(255, 252, 247, 0.95),
        rgba(255, 248, 238, 0.95));
    z-index: 10;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.voice-visualization.active {
    display: flex;
    opacity: 1;
}

.visualization-canvas {
    width: 100%;
    max-width: 600px;
    height: auto;
    filter: drop-shadow(0 4px 20px rgba(242, 158, 109, 0.2));
}

.infinity-loop {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 2;
    stroke-linecap: round;
    opacity: 0.3;
    animation: pulse-path 3s ease-in-out infinite;
}

@keyframes pulse-path {
    0%, 100% {
        opacity: 0.3;
        stroke-width: 2;
    }
    50% {
        opacity: 0.6;
        stroke-width: 3;
    }
}

.particle {
    fill: var(--color-primary);
    filter: blur(0.5px);
}

.particle-1 {
    fill: hsl(var(--emotion-hue), var(--emotion-saturation), var(--emotion-lightness));
}

.particle-2 {
    fill: hsl(calc(var(--emotion-hue) + 20), var(--emotion-saturation), calc(var(--emotion-lightness) - 10%));
}

.particle-3 {
    fill: hsl(calc(var(--emotion-hue) - 20), var(--emotion-saturation), calc(var(--emotion-lightness) + 10%));
}

.visualization-text {
    margin-top: var(--spacing-xl);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    opacity: 0.8;
    letter-spacing: 0.05em;
    animation: fade-pulse 2s ease-in-out infinite;
}

@keyframes fade-pulse {
    0%, 100% {
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
}

/* Active state animations */
.voice-visualization.speaking .infinity-loop {
    stroke-width: 4;
    opacity: 0.8;
    animation: pulse-path-active 1.5s ease-in-out infinite;
}

@keyframes pulse-path-active {
    0%, 100% {
        opacity: 0.6;
        stroke-width: 3;
    }
    50% {
        opacity: 1;
        stroke-width: 5;
    }
}

.voice-visualization.speaking .particle {
    r: 6;
}

/* ===== Bottom History Toggle Bar ===== */
.bottom-toggle-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top,
        rgba(255, 252, 247, 0.98),
        rgba(255, 252, 247, 0.95));
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(233, 213, 183, 0.3);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
    z-index: 150;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: center;
    opacity: 0;
    transform: translateY(100%);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.bottom-toggle-bar.visible {
    opacity: 1;
    transform: translateY(0);
}

.history-toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: linear-gradient(135deg,
        rgba(242, 158, 109, 0.15),
        rgba(233, 213, 183, 0.15));
    border: 1px solid rgba(242, 158, 109, 0.3);
    border-radius: 24px;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-primary);
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.02em;
    min-width: 200px;
    justify-content: center;
}

.history-toggle-btn:hover {
    background: linear-gradient(135deg,
        rgba(242, 158, 109, 0.25),
        rgba(233, 213, 183, 0.25));
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(242, 158, 109, 0.2);
}

.history-toggle-btn svg {
    flex-shrink: 0;
}

.history-toggle-btn span {
    opacity: 0.9;
}

/* Hide bottom bar when sidebar is open */
.chat-sidebar.open ~ .bottom-toggle-bar {
    opacity: 0;
    pointer-events: none;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .bottom-toggle-bar {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .history-toggle-btn {
        font-size: 0.875rem;
        padding: 0.625rem var(--spacing-md);
        min-width: 160px;
    }
}

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

    .visualization-text {
        font-size: 1rem;
    }

    .history-toggle-btn {
        font-size: 0.8125rem;
        gap: 0.5rem;
    }
}