:root {
    /* Light theme colors */
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --secondary-color: #FF9800;
    --accent-color: #F44336;
    --light-bg: #F5F7FA;
    --light-text: #212121;
    --card-bg-light: #FFFFFF;
    --border-light: #E0E0E0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.2);
}

/* Dark theme colors */
body.dark-theme {
    --primary-color: #64B5F6;
    --primary-dark: #42A5F5;
    --primary-light: #90CAF9;
    --secondary-color: #FFB74D;
    --accent-color: #EF5350;
    --dark-bg: #0A192F;
    --dark-text: #E6F1FF;
    --card-bg-dark: #112240;
    --border-dark: #1E3A5F;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.4);
    /* Lighter header for dark theme */
    --header-bg: linear-gradient(135deg, #1E3A5F, #2E5C8A);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--light-text);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    overflow-x: hidden;
}

body.dark-theme {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

/* Loader Styles */
.loader-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loader {
    width: 80px;
    height: 80px;
    position: relative;
    margin-bottom: 20px;
}

.loader-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 5px solid transparent;
    border-top-color: var(--primary-color);
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader-text {
    color: white;
    font-size: 1.2rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* Welcome Screen */
.welcome-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.8s, visibility 0.8s;
}

.welcome-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.welcome-content {
    text-align: center;
    color: white;
    animation: fadeInUp 1.5s ease-out;
}

.logo-container {
    margin-bottom: 30px;
}

.logo-container i {
    font-size: 4rem;
    margin-bottom: 10px;
    color: white;
}

.logo-container h1 {
    font-size: 2.5rem;
    font-weight: bold;
}

.welcome-animation {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.diamond {
    width: 30px;
    height: 30px;
    background-color: white;
    margin: 0 10px;
    transform: rotate(45deg);
    animation: float 3s infinite ease-in-out;
}

.diamond:nth-child(2) {
    animation-delay: 0.5s;
}

.diamond:nth-child(3) {
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(-20px); }
}

.welcome-text {
    font-size: 1.2rem;
    opacity: 0.9;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* App Container */
.app-container {
    max-width: 100%;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 15px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

body.dark-theme .header {
    background: var(--header-bg);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo i {
    font-size: 1.8rem;
    margin-right: 10px;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-toggle, .theme-toggle {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.lang-toggle:hover, .theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-light);
    overflow-x: auto;
    scrollbar-width: none;
}

body.dark-theme .tab-navigation {
    border-bottom-color: var(--border-dark);
}

.tab-navigation::-webkit-scrollbar {
    display: none;
}

.tab-button {
    background: none;
    border: none;
    padding: 12px 20px;
    font-weight: 600;
    color: var(--light-text);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    white-space: nowrap;
}

body.dark-theme .tab-button {
    color: var(--dark-text);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-button i {
    margin-right: 8px;
}

/* Tab Panels */
.tab-panel {
    display: none;
    animation: fadeIn 0.8s;
}

.tab-panel.active {
    display: block;
}

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

.panel-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* Diamond Cards */
.diamonds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
}

.diamond-card {
    background-color: var(--card-bg-light);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.5s, box-shadow 0.5s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    text-align: center;
}

body.dark-theme .diamond-card {
    background-color: var(--card-bg-dark);
}

.diamond-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.diamond-card .card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.diamond-card .card-content p {
    color: #757575;
    margin-bottom: 10px;
}

body.dark-theme .diamond-card .card-content p {
    color: #BDBDBD;
}

.price {
    font-weight: bold;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

/* Membership Cards */
.memberships-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.membership-card {
    background-color: var(--card-bg-light);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.5s, box-shadow 0.5s;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 15px;
}

body.dark-theme .membership-card {
    background-color: var(--card-bg-dark);
}

.membership-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.membership-card .card-icon {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-right: 15px;
}

.membership-card .card-content h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.membership-card .card-content p {
    color: #757575;
    margin-bottom: 5px;
}

body.dark-theme .membership-card .card-content p {
    color: #BDBDBD;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg-light);
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-hover);
    animation: slideIn 0.5s;
    overflow: hidden;
}

body.dark-theme .modal-content {
    background-color: var(--card-bg-dark);
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-light);
}

body.dark-theme .modal-header {
    border-bottom-color: var(--border-dark);
}

.modal-header h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #757575;
    cursor: pointer;
    transition: color 0.3s;
}

.close-modal:hover {
    color: var(--accent-color);
}

.modal-body {
    padding: 20px;
}

.purchase-info {
    margin-bottom: 20px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.info-value {
    font-weight: bold;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background-color: var(--card-bg-light);
    color: var(--light-text);
    font-size: 1rem;
}

body.dark-theme .form-group input {
    background-color: var(--card-bg-dark);
    color: var(--dark-text);
    border-color: var(--border-dark);
}

.phone-input {
    position: relative;
    display: flex;
    align-items: center;
}

.phone-prefix {
    position: absolute;
    left: 10px;
    color: #757575;
    font-weight: bold;
}

.phone-input input {
    padding-left: 25px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .logo-container h1 {
        font-size: 2rem;
    }
    
    .welcome-text {
        font-size: 1rem;
    }
    
    .diamonds-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .tab-button {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .panel-title {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .header-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 10px;
    }
    
    .diamonds-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-content {
        max-width: 100%;
    }
}