/* ==========================================================================
   SHARED STYLES
   Common styles used across multiple pages (extracted from inline CSS)
   ========================================================================== */

/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--button-radius);
    transition: all var(--transition-speed) var(--transition-ease);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-link:hover {
    background: var(--bg-muted);
    color: var(--primary);
}

.nav-link.active {
    background: var(--primary);
    color: var(--text-inverse);
}

.nav-link.admin-link {
    background: var(--accent);
    color: var(--text-inverse);
    font-weight: 600;
}

.nav-link.admin-link:hover {
    background: var(--accent-dark);
}

/* ==========================================================================
   THEME TOGGLE
   ========================================================================== */
.theme-toggle {
    background: var(--bg-muted);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--button-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed) var(--transition-ease);
    color: var(--text-primary);
    margin-left: 0.5rem;
}

.theme-toggle:hover {
    background: var(--border-color);
}

/* ==========================================================================
   MOBILE MENU
   ========================================================================== */
.mobile-menu-btn {
    display: none;
    background: var(--bg-muted);
    border: none;
    width: 44px;
    height: 44px;
    border-radius: var(--button-radius);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .nav {
        display: none !important;
    }

    .mobile-menu-btn {
        display: flex !important;
    }

    .nav.mobile-open {
        display: flex !important;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        z-index: 999;
    }

    .nav.mobile-open .nav-link {
        width: 100%;
        text-align: left;
        padding: 0.75rem 1rem;
    }

    .nav.mobile-open .theme-toggle {
        width: 100%;
        justify-content: center;
        margin-top: 0.5rem;
    }
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    padding: 4rem var(--spacing-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--bg-surface), transparent);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero p {
        font-size: 1.1rem;
    }
}

/* ==========================================================================
   CONTAINER
   ========================================================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg) 4rem;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--button-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) var(--transition-ease);
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--text-inverse);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-muted);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-icon {
    font-size: 1.25rem;
}

/* ==========================================================================
   CARDS
   ========================================================================== */
.card {
    background: var(--bg-surface);
    border-radius: var(--card-radius);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s var(--transition-ease);
}

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

/* Code Card */
.code-card {
    max-width: 600px;
    margin: -2rem auto 3rem;
    background: var(--bg-surface);
    border-radius: var(--card-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.code-display {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--button-radius);
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.code-display::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.code-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.code-value {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 2rem;
    font-weight: 700;
    color: white;
    letter-spacing: 0.1em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.referrer-name {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.code-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.code-actions .btn {
    width: 100%;
}

@media (max-width: 768px) {
    .code-value {
        font-size: 1.5rem;
    }
}

/* Info Cards */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.info-card {
    background: var(--bg-surface);
    border-radius: var(--card-radius);
    padding: 1.75rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s var(--transition-ease);
}

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

.info-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--button-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.info-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.reward-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    display: block;
    margin: 1rem 0 0.5rem;
}

.reward-detail {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    margin-top: 4rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-speed) var(--transition-ease);
}

.footer-link:hover {
    color: var(--primary);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    border-radius: var(--button-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: none;
    animation: slideUp 0.3s var(--transition-ease);
}

.toast.show {
    display: block;
}

@keyframes slideUp {
    from {
        transform: translateX(-50%) translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */
.info-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

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

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

/* ==========================================================================
   FORMS
   ========================================================================== */
.form-card {
    background: var(--bg-surface);
    border-radius: var(--card-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--button-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-speed) var(--transition-ease);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* ==========================================================================
   ALERTS
   ========================================================================== */
.alert {
    padding: 1rem;
    border-radius: var(--button-radius);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideDown 0.3s var(--transition-ease);
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        margin-bottom: 0;
    }
    to {
        opacity: 1;
        max-height: 100px;
        margin-bottom: 1.5rem;
    }
}

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

.alert-success {
    background: var(--success-bg);
    border: 1px solid var(--success);
    color: var(--success);
}

.alert-error {
    background: var(--error-bg);
    border: 1px solid var(--error);
    color: var(--error);
}

.alert-warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning);
    color: var(--warning);
}

.alert-info {
    background: var(--info-bg);
    border: 1px solid var(--info);
    color: var(--info);
}

.alert-icon {
    font-size: 1.25rem;
}

/* ==========================================================================
   INFO SECTION
   ========================================================================== */
.info-section {
    margin-top: 3rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--button-radius);
    border: 1px solid var(--border-color);
}

.info-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.info-list {
    list-style: none;
    padding: 0;
}

.info-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.info-list li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: 600;
}