:root {
    --primary: #8e24aa;
    --primary-variant: #a44fbb;
    --secondary: #a1887f;
    --background: #efebe9;
    --surface: #F5EDED;
    --error: #c62828;
    --success: #2e7d32;
    --warning: #f9a825;
    --on-primary: #ffffff;
    --on-secondary: #000000;
    --on-background: #3e2723;
    --on-surface: #3e2723;
    --on-error: #ffffff;
    --text-primary: rgba(62, 39, 35, 0.95);
    --text-secondary: rgba(62, 39, 35, 0.7);
    --text-hint: rgba(62, 39, 35, 0.5);
    --border-color: rgba(62, 39, 35, 0.12);
    --divider-color: rgba(62, 39, 35, 0.08);
    
    --elevation-1: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --elevation-2: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --elevation-4: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    --shape-small: 4px;
    --shape-medium: 8px;
    --shape-large: 16px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --animation-duration: 0.3s;
    --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #8C3061;
    --primary-variant: #AD49E1;
    --secondary: #5d4037;
    --background: #1E201E;
    --surface: #331D2C;
    --error: #f44336;
    --success: #4caf50;
    --warning: #ff9800;
    --on-primary: #ffffff;
    --on-secondary: #ffffff;
    --on-background: #ffffff;
    --on-surface: #ffffff;
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-hint: rgba(255, 255, 255, 0.5);
    --border-color: rgba(255, 255, 255, 0.12);
    --divider-color: rgba(255, 255, 255, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: "Anek Tamil", sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.6;
    transition: 
        background-color var(--animation-duration) var(--animation-easing),
        color var(--animation-duration) var(--animation-easing);
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    background-color: var(--background);
    width: 100%;
}

.app-header {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    background-color: var(--primary);
    color: var(--on-primary);
    box-shadow: var(--elevation-2);
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.app-header h1 {
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-weight: 700;
    letter-spacing: 0.15px;
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 var(--spacing-sm);
}

.refresh-btn {
    background: none;
    border: none;
    color: var(--on-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 50%;
    transition: all var(--animation-duration) var(--animation-easing);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.refresh-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.refresh-btn .material-icons {
    font-size: 24px;
}

.app-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-bottom: 80px;
    width: 100%;
}

.screen {
    display: none;
    width: 100%;
}

.screen.active {
    display: block;
    animation: fadeIn var(--animation-duration) var(--animation-easing);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.kavithai-card {
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    box-shadow: var(--elevation-1);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--animation-duration) var(--animation-easing);
    border: 1px solid var(--border-color);
    width: 100%;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.kavithai-content {
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(1rem, 4vw, 1.2rem);
    white-space: pre-line;
    line-height: 1.8;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) 0;
}

.copy-button {
    background-color: var(--primary);
    color: var(--on-primary);
    border: none;
    border-radius: var(--shape-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(0.875rem, 3vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: background-color var(--animation-duration) var(--animation-easing);
}

.copy-button:hover {
    background-color: var(--primary-variant);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface);
    box-shadow: 0 -1px 3px 1px rgba(0, 0, 0, 0.1), 0 -1px 2px 0 rgba(0, 0, 0, 0.06);
    z-index: 100;
    border-top: 1px solid var(--border-color);
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.nav-container {
    display: flex;
    justify-content: space-around;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-xs) 0;
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs) 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(0.65rem, 2.5vw, 0.75rem);
    font-weight: 600;
    letter-spacing: 0.5px;
    opacity: 0.9;
    min-width: 0;
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 3px;
}

.nav-item .material-icons {
    margin-bottom: 2px;
    font-size: clamp(20px, 5vw, 24px);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-xs);
    width: 100%;
}

.history-header h2 {
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(1.1rem, 4vw, 1.25rem);
    font-weight: 700;
    color: var(--text-primary);
}

.text-button {
    background: none;
    border: none;
    color: var(--primary);
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    font-family: "Anek Tamil", sans-serif;
    font-weight: 600;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--shape-medium);
    transition: background-color 0.2s;
    white-space: nowrap;
}

.text-button:hover {
    background-color: color-mix(in srgb, var(--primary) 10%, transparent);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    margin-bottom: var(--spacing-md);
}

.history-item {
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    padding: var(--spacing-md);
    box-shadow: var(--elevation-1);
    border: 1px solid var(--border-color);
    transition: all var(--animation-duration) var(--animation-easing);
    overflow: hidden;
    word-wrap: break-word;
    width: 100%;
}

.history-item .kavithai-text {
    white-space: pre-line;
    margin-bottom: var(--spacing-sm);
    font-size: clamp(0.875rem, 3vw, 1rem);
    line-height: 1.6;
}

.history-item .timestamp {
    color: var(--text-secondary);
    font-size: clamp(0.65rem, 2.5vw, 0.75rem);
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.history-item .timestamp .material-icons {
    font-size: clamp(14px, 3vw, 16px);
    margin-right: 4px;
}

.empty-history {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl) 0;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
}

.api-status {
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    padding: var(--spacing-md);
    box-shadow: var(--elevation-1);
    border: 1px solid var(--border-color);
    width: 100%;
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    width: 100%;
}

.status-item:last-child {
    margin-bottom: 0;
}

.status-item .material-icons {
    font-size: clamp(18px, 4vw, 20px);
}

.status-indicator {
    margin-left: auto;
    font-weight: 600;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
}

.status-indicator.online {
    color: var(--success);
}

.status-indicator.offline {
    color: var(--error);
}

.settings-screen {
    padding: 0 var(--spacing-xs);
    width: 100%;
}

.settings-screen h2 {
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(1.1rem, 4vw, 1.25rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding: 0 var(--spacing-xs);
}

.setting-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s;
    gap: var(--spacing-md);
    width: 100%;
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item:hover {
    background-color: color-mix(in srgb, var(--primary) 5%, transparent);
}

.setting-item span {
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    color: var(--text-primary);
    flex-grow: 1;
}

.api-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--shape-small);
    border: 1px solid var(--border-color);
    background-color: var(--surface);
    color: var(--text-primary);
    font-family: "Anek Tamil", sans-serif;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    margin-left: auto;
}

.switch {
    position: relative;
    display: inline-block;
    width: 42px;
    height: 24px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: color-mix(in srgb, var(--text-primary) 30%, transparent);
    transition: .2s var(--animation-easing);
    border-radius: 12px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: var(--surface);
    transition: .2s var(--animation-easing);
    border-radius: 50%;
    box-shadow: var(--elevation-1);
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(18px);
}

.about-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--surface);
    border-radius: var(--shape-medium);
    box-shadow: var(--elevation-1);
    border: 1px solid var(--border-color);
    width: 100%;
}

.about-section h3 {
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.about-section p {
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--error);
    color: var(--on-error);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--shape-medium);
    box-shadow: var(--elevation-6);
    opacity: 0;
    transition: opacity var(--animation-duration) var(--animation-easing);
    z-index: 1000;
    max-width: 90%;
    text-align: center;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    font-weight: 500;
}

.toast.success {
    background-color: var(--success);
    color: var(--on-primary);
}

.toast.show {
    opacity: 1;
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 12px;
        --spacing-lg: 16px;
    }
    
    .app-header {
        padding: var(--spacing-sm);
    }
    
    .app-content {
        padding: var(--spacing-md);
        padding-bottom: 80px;
    }
    
    .kavithai-card {
        padding: var(--spacing-md);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}