/* Base styles - Material Design inspired */
:root {
    /* Material Design color palette */
    --md-primary: #4CAF50;
    --md-primary-light: #80e27e;
    --md-primary-dark: #087f23;
    --md-secondary: #1e293b;
    --md-background: #f8faf8;
    --md-surface: #ffffff;
    --md-error: #ef4444;
    --md-on-primary: #ffffff;
    --md-on-secondary: #f8fafc;
    --md-on-background: #0f172a;
    --md-on-surface: #0f172a;
    --md-on-error: #f8fafc;

    /* Legacy variables for compatibility */
    --background: var(--md-background);
    --foreground: var(--md-on-background);
    --card: var(--md-surface);
    --card-foreground: var(--md-on-surface);
    --primary: var(--md-primary);
    --primary-foreground: var(--md-on-primary);
    --secondary: var(--md-secondary);
    --secondary-foreground: var(--md-on-secondary);
    --muted: #f1f5f9;
    --muted-foreground: #64748b;
    --accent: #f1f5f9;
    --accent-foreground: #1e293b;
    --destructive: var(--md-error);
    --destructive-foreground: var(--md-on-error);
    --border: #e2e8f0;
    --input: #e2e8f0;
    --ring: var(--md-primary);

    /* Material Design elevation (shadows) */
    --radius: 0.5rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Material Design animation */
    --md-transition-standard: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --md-transition-emphasized: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Category colors */
    --all-color: #03A9F4;
    --animal-color: #795548;
    --plant-color: #4CAF50;
    --insect-color: #E91E63;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.main-container {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
    background-color: var(--background);
    max-width: 100%;
    overflow-x: hidden;
}

/* Header styles */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s ease;
}

.fixed-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icons {
    display: flex;
}

.icon {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}

.logo-container:hover .icon {
    transform: scale(1.1);
}

.animal-icon {
    color: var(--animal-color);
}

.plant-icon {
    color: var(--plant-color);
}

.insect-icon {
    color: var(--insect-color);
}

.title-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    transition: color 0.3s ease;
}

/* Name container */
.name-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Language toggle */
.language-toggle-container {
    display: flex;
    align-items: center;
}

.language-toggle-header {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    padding: 0.5rem 0.75rem;
    border-radius: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    color: var(--all-color);
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.language-toggle-header:hover {
    background-color: rgba(255, 255, 255, 1);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

.language-toggle-header:active {
    transform: translateY(0);
}

.language-hint {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Content styles */
.content-container {
    padding-top: 4.5rem;
    padding-bottom: 1rem;
    padding-left: 1rem;
    padding-right: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.subtitle {
    color: var(--muted-foreground);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.main-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--foreground);
    margin-bottom: 1rem;
}

.description {
    color: var(--muted-foreground);
    margin-bottom: 2rem;
    max-width: 42rem;
    margin-left: auto;
    margin-right: auto;
}

/* Organism container */
.organism-container {
    flex: 1;
    padding: 0.5rem 1rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Card styles */
.card {
    overflow: hidden;
    max-width: 28rem;
    margin: 0 auto;
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--card);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-image-container {
    position: relative;
    aspect-ratio: 4/3;
    width: 100%;
    overflow: hidden;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-image {
    transform: scale(1.05);
}

.card-content {
    padding: 1.5rem;
    background-color: var(--card);
}

.card-title-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.card-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--foreground);
}

.card-subtitle-container {
    margin-bottom: 1.5rem;
}

.card-subtitle {
    font-size: 1.5rem;
    color: var(--secondary);
}

.pronunciation-container {
    display: flex;
    justify-content: flex-start;
    margin-top: 0.75rem;
}

.pronunciation-box {
    display: flex;
    justify-content: flex-start;
    gap: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background-color: rgba(255, 255, 255, 0.5);
    width: 100%;
    flex-wrap: wrap;
}

.pronunciation-item {
    display: flex;
    align-items: center;
}

.pronunciation-label {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    margin-right: 0.5rem;
}

.sound-button {
    background: none;
    border: none;
    cursor: pointer;
    height: 2.25rem;
    width: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.sound-button.mandarin {
    color: var(--plant-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    background-color: rgba(76, 175, 80, 0.1);
    transition: all 0.2s;
    min-width: 6.5rem;
    justify-content: center;
    border: none;
}

.sound-button.mandarin:hover {
    background-color: rgba(76, 175, 80, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.sound-button.mandarin:active {
    transform: translateY(0);
}

.sound-button.cantonese {
    color: var(--insect-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    background-color: rgba(233, 30, 99, 0.1);
    transition: all 0.2s;
    min-width: 5.5rem;
    justify-content: center;
    border: none;
}

.sound-button.cantonese:hover {
    background-color: rgba(233, 30, 99, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.sound-button.cantonese:active {
    transform: translateY(0);
}

.sound-button.english {
    color: var(--all-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    background-color: rgba(3, 169, 244, 0.1);
    transition: all 0.2s;
    min-width: 5.5rem;
    justify-content: center;
    border: none;
}

.sound-button.english:hover {
    background-color: rgba(3, 169, 244, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.sound-button.english:active {
    transform: translateY(0);
}

.description-container {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.description-text {
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.fun-facts-container {
    margin-top: 1.25rem;
    background-color: var(--accent);
    padding: 1rem;
    border-radius: 0.75rem;
}

.fun-facts-title {
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--secondary);
}

.fun-facts-list {
    list-style-position: inside;
    padding-left: 1.25rem;
}

.fun-fact-item {
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

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

/* Navigation buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    padding: 1.25rem 0 0.5rem;
}

.nav-button-prev,
.nav-button-next {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    background-color: var(--muted);
    color: var(--secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-button-prev:hover,
.nav-button-next:hover {
    background-color: var(--primary);
    color: var(--primary-foreground);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.nav-button-prev:active,
.nav-button-next:active {
    transform: translateY(0);
}

.nav-button-prev:disabled,
.nav-button-next:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Loading spinner */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 50vh;
}

.spinner {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: 3px solid var(--muted);
    border-top-color: var(--primary);
    animation: spin 1s linear infinite;
    margin-bottom: 1.25rem;
}

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

/* Navigation arrows */
.image-navigation {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
    padding: 0 0.5rem;
}

.arrow-button {
    background-color: rgba(255, 255, 255, 0.8);
    border: none;
    height: 3rem;
    width: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
}

.arrow-button:hover {
    background-color: var(--primary);
    color: var(--primary-foreground);
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.arrow-button:active {
    transform: scale(1);
}

.arrow-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

/* Responsive adjustments - Material Design Breakpoints */

/* Large desktop and up */
@media (min-width: 1200px) {
    .card {
        max-width: 36rem; /* Larger cards on big screens */
    }

    .organism-container {
        display: flex;
        justify-content: center;
    }
}

/* Desktop */
@media (max-width: 1199px) and (min-width: 1025px) {
    .card {
        max-width: 32rem;
    }
}

/* Small desktop and large tablets */
@media (max-width: 1024px) and (min-width: 769px) {
    .card {
        max-width: 100%;
    }

    /* iPad Pro and larger tablets specific styles */
    .organism-container {
        padding: 1rem 2rem;
    }

    .card-content {
        padding: 1.75rem;
    }

    .pronunciation-box {
        display: flex;
        flex-direction: row;
        justify-content: space-around;
    }

    .pronunciation-item {
        flex: 1;
        max-width: 30%;
    }
}

/* iPad and medium tablets - specific styles */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: portrait),
       (min-width: 1024px) and (max-width: 1366px) and (orientation: landscape) {
    .card {
        max-width: 90%;
        margin: 0 auto;
    }

    .card-image-container {
        aspect-ratio: 16/9; /* Wider aspect ratio for tablets */
    }

    .card-content {
        padding: 1.5rem;
    }

    .pronunciation-box {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
    }

    .pronunciation-item {
        width: auto;
        margin-right: 1rem;
        margin-bottom: 0.5rem;
    }

    .sound-button {
        width: auto;
    }

    /* Material elevation for tablets */
    .card {
        box-shadow: var(--shadow-lg);
    }
}

/* Tablets and smaller devices */
@media (max-width: 768px) {
    .header-content {
        padding: 0.75rem 1rem;
    }

    .app-title {
        font-size: 1.125rem;
    }

    .content-container {
        padding-top: 4rem;
    }

    .card-content {
        padding: 1.25rem;
    }

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

    .card-subtitle {
        font-size: 1.25rem;
    }

    .pronunciation-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .pronunciation-item {
        width: 100%;
    }

    .sound-button {
        width: 100%;
    }
}

/* Mobile phones */
@media (max-width: 640px) {
    .header-content {
        padding: 0.5rem 0.75rem;
    }

    .logo-icons {
        transform: scale(0.9);
    }

    .app-title {
        font-size: 1rem;
    }

    .language-toggle-header {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }

    .card-title {
        font-size: 1.25rem;
    }

    .card-subtitle {
        font-size: 1.125rem;
    }

    .navigation-buttons {
        padding: 1rem 0 0.5rem;
    }

    .nav-button-prev,
    .nav-button-next {
        padding: 0.4rem 0.75rem;
        font-size: 0.875rem;
    }

    .arrow-button {
        height: 2.5rem;
        width: 2.5rem;
    }
}

/* Device-specific adjustments */
/* iPad Mini */
@media only screen
and (min-device-width: 768px)
and (max-device-width: 1024px)
and (-webkit-min-device-pixel-ratio: 1) {
    .card {
        max-width: 85%;
    }

    .card-image-container {
        aspect-ratio: 4/3;
    }
}

/* iPad Pro */
@media only screen
and (min-device-width: 1024px)
and (max-device-width: 1366px)
and (-webkit-min-device-pixel-ratio: 2) {
    .card {
        max-width: 80%;
    }

    .card-content {
        padding: 2rem;
    }

    .card-title {
        font-size: 2rem;
    }

    .card-subtitle {
        font-size: 1.5rem;
    }
}

/* Device class-based styles */
.device-tablet .card {
    max-width: 85%;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.device-tablet .card-content {
    padding: 1.75rem;
}

.device-tablet .pronunciation-box {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.75rem;
}

.device-tablet .pronunciation-item {
    width: auto;
    flex: 1;
    min-width: 150px;
}

.device-tablet .sound-button {
    width: 100%;
}

.device-tablet .card-title {
    font-size: 1.75rem;
}

.device-tablet .card-subtitle {
    font-size: 1.5rem;
}

/* iPad specific styles */
.device-ipad .card {
    max-width: 90%;
    box-shadow: var(--shadow-lg);
    border-radius: 12px;
}

.device-ipad .card-image-container {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.device-ipad .card-content {
    padding: 2rem;
}

.device-ipad .pronunciation-box {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    background-color: rgba(76, 175, 80, 0.05);
    border-radius: 12px;
    padding: 1rem;
}

.device-ipad .sound-button {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.device-ipad .sound-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.device-ipad .navigation-buttons {
    padding: 1.5rem 0 1rem;
}

.device-ipad .nav-button-prev,
.device-ipad .nav-button-next {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 8px;
}

/* Animation for speaking */
.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

/* Material Design Ripple Effect - Enhanced */
.ripple {
    position: relative;
    overflow: hidden;
    transform: translate3d(0, 0, 0);
    transition: background-color var(--md-transition-standard);
}

.ripple:after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.7) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.ripple:active:after {
    transform: scale(0, 0);
    opacity: 0.3;
    transition: 0s;
}

/* Material Design Elevation */
.md-elevation-1 {
    box-shadow: var(--shadow-sm);
}

.md-elevation-2 {
    box-shadow: var(--shadow);
}

.md-elevation-3 {
    box-shadow: var(--shadow-md);
}

.md-elevation-4 {
    box-shadow: var(--shadow-lg);
}

.md-elevation-5 {
    box-shadow: var(--shadow-xl);
}

/* Material Design Button Styles */
.md-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-sizing: border-box;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.25rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.0892857143em;
    cursor: pointer;
    transition: box-shadow var(--md-transition-standard),
                background-color var(--md-transition-standard),
                color var(--md-transition-standard);
    overflow: hidden;
}

.md-button-contained {
    background-color: var(--md-primary);
    color: var(--md-on-primary);
    box-shadow: var(--shadow-sm);
}

.md-button-contained:hover {
    background-color: var(--md-primary-dark);
    box-shadow: var(--shadow-md);
}

.md-button-outlined {
    background-color: transparent;
    color: var(--md-primary);
    border: 1px solid var(--md-primary);
}

.md-button-outlined:hover {
    background-color: rgba(76, 175, 80, 0.08);
}

.md-button-text {
    background-color: transparent;
    color: var(--md-primary);
    padding: 0.5rem 0.75rem;
}

.md-button-text:hover {
    background-color: rgba(76, 175, 80, 0.08);
}

/* Light mode only - No dark mode support */