/* ===========================
   CSS RESET & BASE STYLES
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Matching Android App */
    --primary-teal: #008080;
    --dark-bg: #1A1A1A;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --text-gray: #666666;
    --text-dark: #424242;
    --text-light: #BDBDBD;
    --success-bg: #E8F5E9;
    --success-text: #2E7D32;
    --error-bg: #FFEBEE;
    --error-text: #C62828;
    --warning-bg: #FFF3E0;
    --warning-text: #E65100;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

body {
    font-family: var(--font-family);
    background-color: #FFFFFF;
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   LAYOUT COMPONENTS
   =========================== */

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--medium-gray);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.header-title {
    display: flex;
    flex-direction: column;
}

.header-welcome {
    font-size: 14px;
    color: var(--text-gray);
    font-weight: 400;
}

.header-app-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-top: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.diamond-balance {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--dark-bg);
    color: #FFFFFF;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.diamond-balance:hover {
    transform: translateY(-2px);
}

.diamond-icon {
    width: 20px;
    height: 20px;
}

.create-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary-teal) 0%, #006666 100%);
    color: #FFFFFF;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.create-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* ===========================
   CATEGORY TABS
   =========================== */

.category-tabs {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.category-tab {
    flex-shrink: 0;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background-color: transparent;
    color: var(--text-gray);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.category-tab:hover {
    background-color: var(--light-gray);
}

.category-tab.active {
    background-color: var(--primary-teal);
    color: #FFFFFF;
    font-weight: 600;
}

/* ===========================
   MAIN CONTENT
   =========================== */

.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    padding: var(--spacing-lg);
}

.prompts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ===========================
   PROMPT CARD
   =========================== */

.prompt-card {
    background-color: #FFFFFF;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

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

.prompt-card-image-container {
    position: relative;
    width: 100%;
    padding-top: 100%;
    background-color: var(--light-gray);
    overflow: hidden;
}

.prompt-card-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.premium-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: var(--dark-bg);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: var(--shadow-md);
}

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

.prompt-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-bg);
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.prompt-card-author {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.prompt-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.like-count {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-gray);
    font-size: 14px;
}

.credit-cost {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--warning-text);
    font-weight: 600;
    font-size: 14px;
}

/* ===========================
   PAGINATION
   =========================== */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.pagination-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--primary-teal);
    background-color: #FFFFFF;
    color: var(--primary-teal);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    background-color: var(--primary-teal);
    color: #FFFFFF;
    transform: translateY(-2px);
}

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

.pagination-info {
    font-size: 15px;
    color: var(--text-gray);
    font-weight: 500;
}

/* ===========================
   DETAIL PAGE
   =========================== */

.detail-page {
    min-height: 100vh;
    background-color: #FFFFFF;
}

.detail-header {
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--medium-gray);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--dark-bg);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: background-color var(--transition-fast);
    width: 40px;
    height: 40px;
}

.back-btn:hover {
    background-color: var(--light-gray);
}

.back-btn:active {
    background-color: var(--medium-gray);
}

.back-icon {
    font-size: 24px;
    font-weight: bold;
    line-height: 1;
}

.detail-header-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark-bg);
}

.detail-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .detail-content {
        grid-template-columns: 1fr 1.2fr;
        align-items: start;
    }
}

.detail-left-column {
    position: sticky;
    top: calc(var(--spacing-xl) + 60px);
}

.detail-right-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.detail-image-container {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.detail-image {
    width: 100%;
    height: auto;
    display: block;
}

.detail-section {
    margin-bottom: var(--spacing-xl);
}

.detail-section-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.detail-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: var(--spacing-sm);
}

.detail-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--text-gray);
    font-size: 14px;
}

.prompt-box {
    background-color: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.prompt-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-dark);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.locked-prompt {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-gray);
}

.locked-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.action-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--primary-teal);
    background-color: #FFFFFF;
    color: var(--primary-teal);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.action-btn:hover {
    background-color: var(--primary-teal);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.action-btn.primary {
    background-color: var(--primary-teal);
    color: #FFFFFF;
}

.action-btn.primary:hover {
    background-color: #006666;
}

.info-card {
    background-color: var(--light-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.info-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
}

.info-icon {
    font-size: 20px;
}

.info-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.info-value {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 500;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.tag {
    background-color: var(--primary-teal);
    color: #FFFFFF;
    padding: 6px 12px;
    border-radius: var(--radius-lg);
    font-size: 13px;
    font-weight: 500;
}

/* ===========================
   LOADING & EMPTY STATES
   =========================== */

.loading-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary-teal);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--text-gray);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
}

.empty-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.empty-message {
    font-size: 15px;
    color: var(--text-gray);
}

/* ===========================
   TOAST NOTIFICATIONS
   =========================== */

.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--dark-bg);
    color: #FFFFFF;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

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

.toast.error {
    background-color: var(--error-text);
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */

@media (max-width: 1200px) {
    .prompts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .prompts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

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

    .header-app-name {
        font-size: 20px;
    }

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

    .detail-content {
        grid-template-columns: 1fr;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .detail-left-column {
        position: relative;
        top: auto;
    }

    .action-buttons {
        flex-direction: column;
    }

    .diamond-balance,
    .create-btn {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 14px;
    }
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: #ffffff;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    text-align: center;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
    border: none;
    position: relative;
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: #1a1a1a;
}

.modal-description {
    color: #666666;
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-gray);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--light-gray);
    color: var(--text-primary);
}

.modal-logo {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    margin-bottom: var(--spacing-lg);
    object-fit: cover;
    box-shadow: var(--shadow-md);
}



.play-store-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background-color: var(--primary-teal);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    transition: transform var(--transition-fast), background-color var(--transition-fast);
    width: 100%;
}

.play-store-btn:hover {
    background-color: #006666;
    /* Darker teal */
    transform: translateY(-2px);
}

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

@media (max-width: 768px) {
    .modal-content {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .header-welcome {
        font-size: 12px;
    }

    .header-app-name {
        font-size: 18px;
    }

    .category-tab {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 14px;
    }

    .detail-title {
        font-size: 20px;
    }
}

/* ===========================
   UTILITY CLASSES
   =========================== */

.hidden {
    display: none !important;
}

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

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