/* =========================================
   GRAYKAZU ELITE - SIÊU CẤP DESIGN
   ========================================= */

:root {
    --primary: #ff6b00;
    --primary-dark: #e65100;
    --primary-light: #ff9d3f;
    --bg-dark: #0a0a0a;
    --bg-card: #141414;
    --bg-hover: #1f1f1f;
    --text: #ffffff;
    --text-secondary: #b0b0b0;
    --border: #2a2a2a;
    --success: #00c853;
    --warning: #ffd600;
    --danger: #ff3d00;
    --info: #00b0ff;
    --shadow: 0 8px 30px rgba(0,0,0,0.3);
    --shadow-hover: 0 15px 40px rgba(255,107,0,0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Inter', system-ui, sans-serif;
}

body {
    background: var(--bg-dark);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== Container ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* ===== Loading Spinner ===== */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border);
}

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

.logo h1 {
    font-size: 2.5rem;
    background: linear-gradient(45deg, var(--primary), #ffaa00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 2px;
}

.badge {
    background: var(--primary);
    color: var(--bg-dark);
    padding: 5px 15px;
    border-radius: 30px;
    font-weight: bold;
    font-size: 0.8rem;
    animation: pulse 2s infinite;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* ===== Version Tag ===== */
.version-tag {
    background: linear-gradient(145deg, var(--bg-card), #1a1a1a);
    padding: 10px 25px;
    border-radius: 40px;
    border: 1px solid var(--primary);
    color: var(--primary);
    font-weight: bold;
    font-size: 1.1rem;
    box-shadow: 0 0 20px rgba(255,107,0,0.3);
    position: relative;
    overflow: hidden;
}

.version-tag::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,107,0,0.1), transparent);
    animation: shine 3s infinite;
}

/* ===== User Menu ===== */
.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 5px 15px;
    background: var(--bg-card);
    border-radius: 40px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    position: relative;
}

.user-menu:hover {
    border-color: var(--primary);
    background: var(--bg-hover);
}

.avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    border: 2px solid var(--primary);
}

.dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 15px;
    padding: 10px;
    min-width: 150px;
    display: none;
    z-index: 1000;
}

.user-menu:hover .dropdown {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.dropdown button {
    background: transparent;
    border: none;
    color: var(--text);
    padding: 10px;
    text-align: left;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

.dropdown button:hover {
    background: var(--primary);
}

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

.stat-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    animation: slideIn 0.5s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.stat-icon {
    font-size: 3rem;
    background: linear-gradient(45deg, var(--primary), #ffaa00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
}

/* ===== Search Section ===== */
.search-section {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}

.search-input {
    flex: 1;
    padding: 15px 25px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    color: var(--text);
    font-size: 1.1rem;
    transition: all 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(255,107,0,0.3);
}

.filter-select {
    padding: 15px 25px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    color: var(--text);
    font-size: 1.1rem;
    cursor: pointer;
    min-width: 150px;
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 12px 25px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--primary);
    background: var(--bg-card);
}

.tab-btn.active {
    background: var(--primary);
    color: var(--bg-dark);
}

/* ===== Content Grid ===== */
.content {
    min-height: 500px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
    animation: fadeIn 0.5s ease;
}

/* ===== Card ===== */
.card {
    background: var(--bg-card);
    border-radius: 25px;
    padding: 25px;
    border: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}

.card:hover::before {
    width: 6px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.card-title {
    font-size: 1.5rem;
    color: var(--primary);
    margin: 0;
}

.card-badge {
    background: linear-gradient(45deg, var(--primary), #ffaa00);
    color: var(--bg-dark);
    padding: 5px 15px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: bold;
}

.card-price {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
    margin: 15px 0;
}

.card-meta {
    display: flex;
    gap: 15px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 10px 0;
}

.card-footer {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* ===== Buttons ===== */
.btn {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
}

.btn:hover {
    background: var(--primary);
    color: var(--bg-dark);
    transform: scale(1.05);
}

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

.btn-danger {
    border-color: var(--danger);
    color: var(--danger);
}

.btn-danger:hover {
    background: var(--danger);
    color: white;
}

/* ===== Floating Buttons ===== */
.dev-btn, .login-btn, .chat-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1000;
    transition: all 0.3s;
    animation: bounce 2s infinite;
}

.dev-btn {
    background: var(--primary);
    color: var(--bg-dark);
    box-shadow: 0 5px 20px var(--primary);
}

.login-btn {
    background: var(--info);
    color: white;
    bottom: 100px;
}

.chat-btn {
    background: var(--success);
    color: white;
    width: 60px;
    height: 60px;
    padding: 0;
    border-radius: 50%;
    font-size: 1.5rem;
    bottom: 30px;
    left: 30px;
    right: auto;
}

/* ===== Chat Widget ===== */
.chat-widget {
    position: fixed;
    bottom: 100px;
    left: 30px;
    width: 350px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    z-index: 999;
    box-shadow: var(--shadow);
}

.chat-header {
    background: var(--primary);
    padding: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-badge {
    background: white;
    color: var(--primary);
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.chat-body {
    max-height: 400px;
    overflow-y: auto;
}

.chat-messages {
    padding: 15px;
    min-height: 300px;
    max-height: 300px;
    overflow-y: auto;
}

.message {
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
}

.message.sent {
    align-items: flex-end;
}

.message.received {
    align-items: flex-start;
}

.message-text {
    max-width: 80%;
    padding: 10px;
    border-radius: 15px;
    background: var(--bg-hover);
}

.message.sent .message-text {
    background: var(--primary);
    color: var(--bg-dark);
}

.chat-input {
    display: flex;
    padding: 10px;
    gap: 10px;
    border-top: 1px solid var(--border);
}

.chat-input input {
    flex: 1;
    padding: 10px;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: 30px;
    color: var(--text);
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-card);
    border-radius: 30px;
    width: 90%;
    max-width: 1200px;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border);
    animation: slideUp 0.4s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg-card);
    z-index: 10;
}

.modal-header h2 {
    color: var(--primary);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.close-btn:hover {
    background: var(--danger);
    transform: rotate(90deg);
}

.modal-body {
    padding: 30px;
}

/* ===== Admin Tabs ===== */
.admin-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.admin-tab {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 25px;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s;
}

.admin-tab:hover, .admin-tab.active {
    background: var(--primary);
    color: var(--bg-dark);
    border-color: var(--primary);
}

/* ===== Admin Forms ===== */
.admin-form {
    background: var(--bg-hover);
    padding: 25px;
    border-radius: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 15px;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(255,107,0,0.3);
}

/* ===== Login Modal ===== */
.login-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.login-tab {
    flex: 1;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s;
}

.login-tab.active {
    background: var(--primary);
    color: var(--bg-dark);
    border-color: var(--primary);
}

.login-form {
    animation: fadeIn 0.4s ease;
}

.login-input {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: 15px;
    color: var(--text);
    font-size: 1rem;
}

.login-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.login-submit {
    width: 100%;
    padding: 15px;
    background: var(--primary);
    border: none;
    border-radius: 15px;
    color: var(--bg-dark);
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.login-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--primary);
}

.login-divider {
    text-align: center;
    margin: 20px 0;
    position: relative;
}

.login-divider::before,
.login-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 45%;
    height: 1px;
    background: var(--border);
}

.login-divider::before { left: 0; }
.login-divider::after { right: 0; }

.google-login {
    width: 100%;
    padding: 15px;
    background: white;
    border: none;
    border-radius: 15px;
    color: #333;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s;
}

.google-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255,255,255,0.3);
}

.google-login img {
    width: 20px;
    height: 20px;
}

/* ===== Toast Notifications ===== */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    background: var(--primary);
    color: var(--bg-dark);
    border-radius: 50px;
    font-weight: bold;
    z-index: 3000;
    animation: slideIn 0.3s ease;
    box-shadow: 0 5px 20px rgba(255,107,0,0.5);
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

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

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container { padding: 10px; }
    
    .logo h1 { font-size: 1.8rem; }
    
    .stats-grid { grid-template-columns: 1fr; }
    
    .search-section { flex-direction: column; }
    
    .grid { grid-template-columns: 1fr; }
    
    .modal-content { width: 95%; padding: 15px; }
    
    .chat-widget {
        width: 300px;
        left: 10px;
        bottom: 80px;
    }
}

/* ===== Utilities ===== */
.hidden { display: none !important; }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.bg-primary { background: var(--primary); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.p-20 { padding: 20px; }