/* ===== ROOT VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #6c63ff;
    --primary-dark: #554fb8;
    --primary-light: #8a84ff;
    --secondary-color: #495057;
    --accent-color: #ff6b6b;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Background Colors */
    --bg-dark: #0d0e0f;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --bg-card: #1a1b1e;
    --bg-nav: #2d2e33;
    
    /* Text Colors */
    --text-primary: #343a40;
    --text-light: #6c757d;
    --text-white: #ffffff;
    --text-muted: #adb5bd;
    
    /* Border & Shadow */
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --shadow-light: 0 3px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 10px 30px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --space-xs: 5px;
    --space-sm: 10px;
    --space-md: 15px;
    --space-lg: 20px;
    --space-xl: 30px;
    --space-xxl: 40px;
    
    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 15px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', 'Segoe UI', Arial, sans-serif;
    background: #0d0e0f;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1a2e 50%, #16213e 100%);
    color: var(--text-white);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 2rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--space-sm);
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), transparent);
    border-radius: var(--radius-sm);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-white);
}

p {
    margin-bottom: var(--space-md);
    color: var(--text-muted);
}

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

/* Header */
header {
    background: #2d2e33;
    background: linear-gradient(135deg, var(--bg-nav) 0%, #2d2e33 100%);
    color: var(--text-white);
    padding: var(--space-lg) var(--space-xl);
    text-align: center;
    box-shadow: var(--shadow-heavy);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--info-color));
}

.header-content {
    position: relative;
    z-index: 2;
}

/* Navigation */
.nav-menu {
    display: flex;
    justify-content: center;
    background: rgba(45, 46, 51, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    padding: var(--space-md);
    margin-top: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-menu ul {
    list-style: none;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-white);
    font-size: 0.95rem;
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: block;
}

.nav-menu a:hover {
    color: var(--primary-light);
    background: rgba(108, 99, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 99, 255, 0.2);
}

.nav-menu a:active {
    transform: none;
    background: rgba(108, 99, 255, 0.2);
    transition: all 0.1s ease;
}

.nav-menu a:focus {
    transform: none;
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    background: rgba(108, 99, 255, 0.15);
}

.nav-menu a.active {
    background: var(--primary-color);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
    transform: none;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.nav-menu a:hover::before {
    left: 100%;
}

.nav-menu a:active::before {
    animation: none;
    transition: none;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: var(--space-xl);
}

/* Sections */
.section {
    background: var(--bg-card);
    margin: var(--space-lg) auto;
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-heavy);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    max-width: 1200px;
}

.section:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

/* ===== FORM ELEMENTS ===== */

/* Form Groups */
.form-group {
    margin-bottom: var(--space-lg);
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--text-white);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-white);
    transition: all var(--transition-normal);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}I

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
    transform: translateY(-2px);
}

/* ===== LOGIN & AUTHENTICATION STYLES ===== */

/* Login Container */
.login-container {
    max-width: 450px;
    margin: 80px auto;
    padding: var(--space-xxl);
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-heavy);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.login-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.login-header h2 {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Login Form */
.login-form {
    margin-bottom: var(--space-lg);
}

.login-form .form-group {
    margin-bottom: var(--space-lg);
}

.login-form label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--text-white);
    font-size: 0.95rem;
}

.login-form input[type="email"],
.login-form input[type="password"],
.login-form input[type="text"] {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-white);
    transition: all var(--transition-normal);
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
}

/* Remember Me Checkbox */
.remember-me {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.remember-me input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.remember-me label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
    cursor: pointer;
}

/* Login Button */
.login-btn {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.4);
}

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

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Login Links */
.login-links {
    text-align: center;
    margin-top: var(--space-lg);
}

.login-links a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: block;
    margin-bottom: var(--space-sm);
}

.login-links a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.login-links .register-link {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== ALERT & MESSAGE STYLES ===== */
.alert {
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    text-align: center;
    border: 1px solid transparent;
    animation: slideInDown 0.3s ease;
}

.alert-success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
    border-color: rgba(40, 167, 69, 0.3);
}

.alert-error {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    border-color: rgba(220, 53, 69, 0.3);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
    border-color: rgba(255, 193, 7, 0.3);
}

.alert-info {
    background: rgba(23, 162, 184, 0.1);
    color: var(--info-color);
    border-color: rgba(23, 162, 184, 0.3);
}

/* ===== LOADING STYLES ===== */
.loader {
    display: none;
    text-align: center;
    margin: var(--space-lg) 0;
    padding: var(--space-md);
}

.loader.active {
    display: block;
}

.loader-content {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

@keyframes slideInDown {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ===== BUTTONS ===== */
button, .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

button::before, .button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

button:hover::before, .button:hover::before {
    left: 100%;
}

.btn-primary {
    background: #6c63ff;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    background: linear-gradient(135deg, var(--success-color), #20c997);
    color: var(--text-white);
}

.btn-danger {
    background: #dc3545;
    background: linear-gradient(135deg, var(--danger-color), #e63946);
    color: var(--text-white);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

.register-button {
    background-color: #28a745;
}

.register-button:hover {
    background-color: #218838;
}

.login-button {
    background-color: #17a2b8;
}

.login-button:hover {
    background-color: #117a8b;
}

/* Button Groups */
.top-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-md);
    flex-wrap: wrap;
}

/* ===== TABLE STYLES ===== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}

table th,
table td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

table th {
    background: #6c63ff;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

table tr {
    transition: background-color var(--transition-fast);
}

table tr:hover {
    background: rgba(108, 99, 255, 0.05);
}

table tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

table tr:nth-child(even):hover {
    background: rgba(108, 99, 255, 0.08);
}

/* ===== SPECIAL COMPONENTS ===== */

/* Timer */
.timer {
    text-align: center;
    padding: var(--space-xl);
    background: rgba(108, 99, 255, 0.1);
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(255, 107, 107, 0.1));
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: var(--space-lg) 0;
}

.timer p {
    font-size: 1.1rem;
    margin-bottom: var(--space-md);
    color: var(--text-white);
}

#timer {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(108, 99, 255, 0.3);
}

/* Auction Actions */
.auction-actions {
    text-align: center;
    padding: var(--space-xl);
}

.calculator {
    background: rgba(40, 167, 69, 0.1);
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.1), rgba(23, 162, 184, 0.1));
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Cards */
.card {
    background: var(--bg-card);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

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

.card-header {
    background: #6c63ff;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    padding: var(--space-md);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    margin: -var(--space-lg) -var(--space-lg) var(--space-lg) -var(--space-lg);
}

/* ===== HOMEPAGE SPECIFIC STYLES ===== */

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(255, 107, 107, 0.1));
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-content {
    text-align: center;
    padding: 40px 20px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 40px 0;
}

.stat {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
}

.hero-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-large {
    padding: 15px 30px;
    font-size: 1.1rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

/* Steps Container */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
}

/* Calculator Styles */
.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.calculator-form {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.calculator-button {
    width: 100%;
    margin-top: 10px;
}

.calculator-result {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.profit-result h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    text-align: center;
}

.result-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.result-item.total {
    border-top: 2px solid var(--primary-color);
    border-bottom: none;
    font-weight: bold;
    font-size: 1.1rem;
}

.profit {
    color: var(--success-color);
}

.total-return {
    color: var(--primary-color);
}

.error-message {
    color: var(--danger-color);
    text-align: center;
    padding: 10px;
}

/* Schedule Grid */
.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.session-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.session-time {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.session-name {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.session-status {
    font-weight: bold;
}

/* Contact Grid */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-section {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(255, 107, 107, 0.1));
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

/* ===== MESSAGE STYLES ===== */
.message {
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-md) 0;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-align: center;
    border: 1px solid transparent;
}

.message.success {
    background: rgba(40, 167, 69, 0.1);
    color: #28a745;
    border-color: rgba(40, 167, 69, 0.3);
}

.message.error {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
    border-color: rgba(220, 53, 69, 0.3);
}

.message.warning {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
    border-color: rgba(255, 193, 7, 0.3);
}

.message.info {
    background: rgba(23, 162, 184, 0.1);
    color: #17a2b8;
    border-color: rgba(23, 162, 184, 0.3);
}

/* ===== LOADING & ANIMATIONS ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* ===== FOOTER ===== */
footer {
    background: #2d2e33;
    background: linear-gradient(135deg, var(--bg-nav) 0%, #2d2e33 100%);
    color: var(--text-white);
    text-align: center;
    padding: var(--space-xl);
    margin-top: var(--space-xxl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-top: var(--space-sm);
}

footer a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

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

/* Tablets */
@media (max-width: 768px) {
    :root {
        --space-xl: 20px;
        --space-xxl: 30px;
    }
    
    header {
        padding: var(--space-lg);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .nav-menu ul {
        flex-direction: column;
        gap: var(--space-xs);
    }
    
    .nav-menu li {
        width: 100%;
        text-align: center;
    }
    
    .section {
        padding: var(--space-lg);
        margin: var(--space-md);
    }
    
    .top-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .top-buttons .button {
        width: 100%;
        max-width: 250px;
    }
    
    .login-container {
        margin: 40px 20px;
        padding: var(--space-xl);
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-container {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-actions, .cta-buttons {
        flex-direction: column;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    #timer {
        font-size: 2rem;
    }
}

/* Mobile Phones */
@media (max-width: 480px) {
    :root {
        --space-lg: 15px;
        --space-xl: 15px;
    }
    
    main {
        padding: var(--space-md);
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .section {
        padding: var(--space-md);
        margin: var(--space-sm) 0;
    }
    
    .login-container {
        margin: 20px 10px;
        padding: var(--space-lg);
    }
    
    .login-header h2 {
        font-size: 1.5rem;
    }
    
    .form-group input,
    .form-group select,
    button,
    .button {
        width: 100%;
    }
    
    table {
        display: block;
        overflow-x: auto;        
        -webkit-overflow-scrolling: touch;       
    }
    
    #timer {
        font-size: 1.75rem;
    }
}

/* Large Screens */
@media (min-width: 1200px) {
    .section {
        max-width: 1400px;
    }
    
    .login-container {
        max-width: 500px;
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-xs); }
.p-2 { padding: var(--space-sm); }
.p-3 { padding: var(--space-md); }
.p-4 { padding: var(--space-lg); }
.p-5 { padding: var(--space-xl); }

.d-flex { display: flex; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-none { display: none; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.align-center { align-items: center; }
.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }

.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.shadow { box-shadow: var(--shadow-medium); }
.shadow-lg { box-shadow: var(--shadow-heavy); }

.hidden {
    display: none !important;
}

/* ===== ACCESSIBILITY ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Fallback for browsers that don't support :focus-visible */
button:focus,
a:focus,
input:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* Safari specific fixes */
@supports (-webkit-touch-callout: none) {
    .nav-menu {
        -webkit-backdrop-filter: blur(10px);
        backdrop-filter: blur(10px);
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        -webkit-backdrop-filter: blur(10px);
        backdrop-filter: blur(10px);
    }
}

/* Microsoft Edge specific fixes */
@supports (-ms-ime-align: auto) {
    .nav-menu {
        background: rgba(45, 46, 51, 0.98);
    }
}

/* Basic reset and styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    color: #e0e0e0;
    min-height: 100vh;
    line-height: 1.6;
}

/* END OF FILE */