/* Viettel Management System - CSS Framework */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* Password Change Page Styles */
.change-password-container {
    animation: fadeInUp 0.6s ease-out;
}

.password-requirements {
    background: var(--surface-secondary);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.requirement {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
    font-size: 0.875rem;
}

.requirement .icon {
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn-full {
    width: 100%;
}

.form-note {
    background: var(--warning-50);
    border-left: 4px solid var(--warning-500);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.form-note ul {
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

.form-note li {
    margin-bottom: 0.25rem;
}

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

*::before,
*::after {
    box-sizing: border-box;
}

:root {
    /* Modern Professional Color Palette - Red Theme */
    --primary-25: #fffbfb;
    --primary-50: #fef2f2;
    --primary-75: #fee5e5;
    --primary-100: #fecaca;
    --primary-200: #fca5a5;
    --primary-300: #f87171;
    --primary-400: #f56565;
    --primary-500: #ef4444;
    --primary-600: #dc2626;
    --primary-700: #b91c1c;
    --primary-800: #991b1b;
    --primary-900: #7f1d1d;
    
    --secondary-25: #fbfcfd;
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    --success-50: #ecfdf5;
    --success-100: #d1fae5;
    --success-200: #a7f3d0;
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    
    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-200: #fecaca;
    --danger-400: #f87171;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --danger-700: #b91c1c;
    
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-200: #fde68a;
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    
    /* Semantic Color Variables */
    --primary-color: var(--primary-600);
    --primary-dark: var(--primary-700);
    --secondary-color: var(--secondary-500);
    --success-color: var(--success-500);
    --danger-color: var(--danger-500);
    --warning-color: var(--warning-500);
    
    /* Background & Surface */
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --background-subtle: linear-gradient(135deg, var(--secondary-50) 0%, var(--primary-50) 100%);
    --surface-primary: #ffffff;
    --surface-secondary: var(--secondary-50);
    --surface-elevated: #ffffff;
    
    /* Text Colors */
    --text-primary: var(--secondary-900);
    --text-secondary: var(--secondary-600);
    --text-tertiary: var(--secondary-500);
    --text-inverse: #ffffff;
    
    /* Border & Divider */
    --border-color: var(--secondary-200);
    --border-focus: var(--primary-300);
    --divider-color: var(--secondary-100);
    
    /* Professional Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* Modern Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.90);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   BASE STYLES
   ========================================================================== */

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-base);
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background-subtle);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

/* Professional backdrop for modern browsers */
@supports (-webkit-backdrop-filter: blur(10px)) or (backdrop-filter: blur(10px)) {
    body::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: var(--background-gradient);
        z-index: -2;
    }
    
    body::after {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(255, 255, 255, 0.85);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        z-index: -1;
    }
}

/* ==========================================================================
   LAYOUT & CONTAINERS
   ========================================================================== */

.container {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 640px) {
    .container {
        max-width: 640px;
        padding: 0 var(--space-lg);
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 768px;
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: 1024px;
        padding: 0 var(--space-xl);
    }
}

@media (min-width: 1280px) {
    .container {
        max-width: 1200px;
    }
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */

.header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-fast);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        var(--primary-600) 0%, 
        var(--primary-500) 50%, 
        var(--primary-600) 100%);
    opacity: 0.03;
    pointer-events: none;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) 0;
    position: relative;
    z-index: 1;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    transition: all var(--transition-fast);
}

.logo:hover {
    color: var(--primary-700);
    transform: translateY(-1px);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    filter: drop-shadow(0 2px 4px rgba(37, 99, 235, 0.2));
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    background: var(--surface-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.user-info:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.btn-logout {
    color: var(--danger-500);
    text-decoration: none;
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    background: var(--danger-50);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-logout:hover {
    background: var(--danger-100);
    color: var(--danger-600);
    border-color: var(--danger-200);
    transform: translateY(-1px);
}

/* ==========================================================================
   LOGIN PAGE
   ========================================================================== */

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    position: relative;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 15%;
    left: -5%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--primary-400) 0%, transparent 70%);
    opacity: 0.08;
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.login-container::after {
    content: '';
    position: absolute;
    bottom: 15%;
    right: -5%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--success-400) 0%, transparent 70%);
    opacity: 0.08;
    border-radius: 50%;
    animation: float 4s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.login-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--glass-shadow);
    padding: var(--space-3xl) var(--space-xl);
    width: 100%;
    max-width: 420px;
    position: relative;
    overflow: hidden;
    animation: slideUpIn 0.6s ease-out;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, 
        var(--primary-500) 0%, 
        var(--primary-400) 50%, 
        var(--primary-500) 100%);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

@keyframes slideUpIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.025em;
}

.login-subtitle {
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    font-weight: 400;
    margin-bottom: var(--space-2xl);
    line-height: 1.5;
}

/* ==========================================================================
   FORM COMPONENTS
   ========================================================================== */

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

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.025em;
    transition: color var(--transition-fast);
}

.form-label.required::after {
    content: ' *';
    color: var(--danger-500);
    font-weight: 500;
}

.form-input {
    width: 100%;
    max-width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: 400;
    background: var(--surface-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
    position: relative;
    z-index: 1;
    box-sizing: border-box;
}

.form-input::placeholder {
    color: var(--text-tertiary);
    font-weight: 400;
    transition: color var(--transition-fast);
}

.form-input:hover {
    border-color: var(--border-focus);
    background: var(--surface-elevated);
    box-shadow: var(--shadow-sm);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-400);
    background: var(--surface-elevated);
    box-shadow: 0 0 0 4px var(--primary-100), var(--shadow-md);
    transform: translateY(-1px);
}

.form-input:focus::placeholder {
    color: var(--primary-400);
}

.form-input.error {
    border-color: var(--danger-400);
    background: var(--danger-50);
    animation: shake 0.5s ease-in-out;
}

.form-input.error:focus {
    box-shadow: 0 0 0 4px var(--danger-100), var(--shadow-md);
    border-color: var(--danger-500);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-3px); }
    20%, 40%, 60%, 80% { transform: translateX(3px); }
}

.form-select {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: 400;
    background: var(--surface-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    background-image: url("data:image/svg+xml;charset=utf-8,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-md) center;
    background-repeat: no-repeat;
    background-size: 1.25rem 1.25rem;
    padding-right: var(--space-3xl);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.form-select:hover {
    border-color: var(--border-focus);
    background-color: var(--surface-elevated);
    box-shadow: var(--shadow-sm);
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-400);
    background-color: var(--surface-elevated);
    box-shadow: 0 0 0 4px var(--primary-100), var(--shadow-md);
    transform: translateY(-1px);
}

.form-textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: 400;
    background: var(--surface-primary);
    color: var(--text-primary);
    min-height: 120px;
    resize: vertical;
    font-family: inherit;
    line-height: 1.6;
    transition: all var(--transition-normal);
}

.form-textarea::placeholder {
    color: var(--text-tertiary);
}

.form-textarea:hover {
    border-color: var(--border-focus);
    background: var(--surface-elevated);
    box-shadow: var(--shadow-sm);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--primary-400);
    background: var(--surface-elevated);
    box-shadow: 0 0 0 4px var(--primary-100), var(--shadow-md);
    transform: translateY(-1px);
}

.error-message {
    color: var(--danger-600);
    font-size: var(--font-size-xs);
    font-weight: 500;
    margin-top: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    animation: slideInDown 0.3s ease-out;
}

.error-message::before {
    content: '⚠';
    font-size: var(--font-size-sm);
}

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

/* ==========================================================================
   BUTTON COMPONENTS
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    border: 2px solid transparent;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    gap: var(--space-sm);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.025em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn:disabled::before {
    display: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-700) 0%, var(--primary-600) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--surface-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--surface-elevated);
    border-color: var(--border-focus);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-600) 0%, var(--success-500) 100%);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--success-700) 0%, var(--success-600) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.btn-lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--font-size-base);
}

/* ==========================================================================
   DASHBOARD & CARDS
   ========================================================================== */

.dashboard {
    padding: var(--space-xl) 0;
}

.dashboard-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--space-2xl);
    text-align: center;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

@media (min-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-400) 100%);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

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

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    color: var(--primary-600);
    margin-bottom: var(--space-xs);
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-card.success .stat-value {
    background: linear-gradient(135deg, var(--success-600) 0%, var(--success-500) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-card.success::before {
    background: linear-gradient(90deg, var(--success-500) 0%, var(--success-400) 100%);
}

.form-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--space-xl);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.form-card:hover {
    box-shadow: var(--shadow-xl);
}

.form-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-xl);
    text-align: center;
    color: var(--text-primary);
    position: relative;
    padding-bottom: var(--space-md);
}

.form-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-400) 100%);
    border-radius: var(--radius-full);
}

.form-grid {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .form-group.full-width {
        grid-column: 1 / -1;
    }
}


/* ==========================================================================
   ALERTS & NOTIFICATIONS
   ========================================================================== */

.alert {
    padding: var(--space-lg);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-lg);
    border-left: 4px solid;
    font-weight: 500;
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
    animation: slideInDown 0.4s ease-out;
}

.alert::before {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.alert-success {
    background: linear-gradient(135deg, var(--success-50) 0%, var(--success-100) 100%);
    border-color: var(--success-500);
    color: var(--success-700);
}

.alert-success::before {
    content: '✅';
}

.alert-error {
    background: linear-gradient(135deg, var(--danger-50) 0%, var(--danger-100) 100%);
    border-color: var(--danger-500);
    color: var(--danger-700);
}

.alert-error::before {
    content: '❌';
}

.alert-warning {
    background: linear-gradient(135deg, var(--warning-50) 0%, var(--warning-100) 100%);
    border-color: var(--warning-500);
    color: var(--warning-700);
}

.alert-warning::before {
    content: '⚠️';
}

.alert-info {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-color: var(--primary-500);
    color: var(--primary-700);
}

.alert-info::before {
    content: 'ℹ️';
}

/* ==========================================================================
   LOADING & ANIMATIONS
   ========================================================================== */

.spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 3px solid transparent;
    border-top: 3px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ==========================================================================
   TRIPS LIST & DATA DISPLAY
   ========================================================================== */

.trips-list .trip-item {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--divider-color);
    transition: all var(--transition-fast);
    position: relative;
}

.trips-list .trip-item:last-child {
    border-bottom: none;
}

.trips-list .trip-item:hover {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--secondary-50) 100%);
    transform: translateX(4px);
}

/* ==========================================================================
   GROUPED TRIPS DISPLAY
   ========================================================================== */

.trip-group {
    transition: all var(--transition-normal);
}

.trip-group:last-child {
    border-bottom: none !important;
}

.trip-group:hover {
    background: linear-gradient(135deg, var(--primary-25) 0%, var(--secondary-25) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
}

.trip-group-header {
    position: relative;
}

.trip-main-info {
    flex: 1;
}

.trip-date-info {
    flex-shrink: 0;
}

.trip-summary {
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.trip-summary:hover {
    border-color: var(--border-focus);
    background: var(--surface-elevated) !important;
}

.trip-points-list {
    position: relative;
}

.trip-points-list::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-200), transparent);
    z-index: 1;
}

.trip-point-item {
    position: relative;
    z-index: 2;
    transition: all var(--transition-fast);
}

.trip-point-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-focus) !important;
}

.trip-point-item:last-child {
    margin-bottom: 0 !important;
}

.point-number {
    position: relative;
    z-index: 3;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.trip-point-item:hover .point-number {
    background: var(--primary-200) !important;
    color: var(--primary-800) !important;
    transform: scale(1.1);
}

.point-details {
    background: transparent;
}

.point-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.point-metrics {
    margin-top: 0.5rem;
}

.point-note {
    transition: all var(--transition-fast);
}

.trip-point-item:hover .point-note {
    background: var(--warning-100) !important;
}

/* Trip type badges */
.trip-type-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.trip-type-badge.ket-noi {
    background: var(--primary-100);
    color: var(--primary-700);
}

.trip-type-badge.kinh-doanh {
    background: var(--success-100);
    color: var(--success-700);
}

.trip-type-badge.phuc-vu {
    background: var(--warning-100);
    color: var(--warning-700);
}

.trip-type-badge.phat-hang {
    background: var(--secondary-100);
    color: var(--secondary-700);
}

.trip-type-badge.bdsc {
    background: var(--danger-100);
    color: var(--danger-700);
}

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

.demo-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.demo-info {
    background: #f8fafc;
    padding: 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    text-align: left;
}

.form-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
}

.success-actions {
    margin-top: 1rem;
}

.btn-spacing {
    margin-right: 0.5rem;
}

.demo-subtitle {
    margin-bottom: 1rem;
}

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

@media (max-width: 639px) {
    body {
        overflow-x: hidden;
    }
    
    .container {
        max-width: 100vw;
        overflow-x: hidden;
    }
    
    .form-card {
        margin: 0.5rem;
        padding: 1rem;
        max-width: calc(100vw - 1rem);
        box-sizing: border-box;
        border-radius: var(--radius-xl);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        padding: 0.75rem 1rem; /* Smaller padding for mobile */
        font-size: 16px; /* Prevent zoom on iOS */
        min-height: 48px; /* Touch-friendly minimum height */
        border-radius: var(--radius-lg);
    }
    
    .form-group {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        margin-bottom: 1rem;
    }
    
    /* Mobile-specific date input styling */
    input[type="date"] {
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
        background: var(--surface-primary);
        border: 2px solid var(--border-color);
        border-radius: var(--radius-lg);
        padding: 0.75rem 1rem;
        font-size: 16px;
        width: 100%;
        min-height: 48px;
        box-sizing: border-box;
    }
    
    input[type="date"]:focus {
        border-color: var(--primary-400);
        box-shadow: 0 0 0 4px var(--primary-100);
        outline: none;
    }
    
    input[type="date"]::-webkit-calendar-picker-indicator {
        background: transparent;
        bottom: 0;
        color: transparent;
        cursor: pointer;
        height: auto;
        left: 0;
        position: absolute;
        right: 0;
        top: 0;
        width: auto;
    }
    
    .login-card {
        margin: var(--space-md);
        padding: var(--space-xl) var(--space-lg);
    }
    
    .header-content {
        padding: var(--space-md) 0;
    }
    
    .user-info {
        gap: var(--space-sm);
        padding: var(--space-xs) var(--space-sm);
    }
    
    /* Mobile button improvements */
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 16px;
        min-height: 48px;
        line-height: 1.2;
        border-radius: var(--radius-lg);
    }
    
    .form-actions {
        gap: 0.75rem;
        grid-template-columns: 1fr 1fr;
    }
    
    .form-actions .btn {
        padding: 0.875rem 1rem;
        font-size: 15px;
        white-space: nowrap;
    }
    
    .user-name {
        display: none; /* Hide on very small screens */
    }
}

/* ==========================================================================
   ACCESSIBILITY & FOCUS STATES
   ========================================================================== */

.btn:focus-visible,
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    .form-input,
    .form-select,
    .form-textarea {
        border-width: 3px;
    }
    
    .btn {
        border-width: 3px;
    }
}

/* Dark mode support (future enhancement) */
@media (prefers-color-scheme: dark) {
    /* Dark mode variables would go here */
}

/* ==========================================================================
   AUTOCOMPLETE STYLES - Modern & Clean
   ========================================================================== */
   
.autocomplete-container {
    position: relative;
    width: 100%;
}

.autocomplete-suggestions {
    position: absolute;
    top: calc(100% + 4px); /* Tạo khoảng cách với input */
    left: 0;
    right: 0;
    background: var(--surface-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    max-height: 250px;
    overflow: hidden;
    overflow-y: auto;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.95);
    transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.autocomplete-suggestions.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Custom scrollbar for suggestions */
.autocomplete-suggestions::-webkit-scrollbar {
    width: 6px;
}

.autocomplete-suggestions::-webkit-scrollbar-track {
    background: transparent;
}

.autocomplete-suggestions::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.autocomplete-suggestions::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-400);
}

.suggestion-item {
    padding: 12px 16px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.15s ease;
    border-bottom: 1px solid var(--secondary-100);
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    background: var(--surface-primary);
}

.suggestion-item:last-child {
    border-bottom: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.suggestion-item:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.suggestion-item:only-child {
    border-radius: var(--radius-lg);
}

.suggestion-item:hover {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-25) 100%);
    color: var(--primary-700);
    transform: translateX(2px);
}

.suggestion-item.selected {
    background: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-75) 100%);
    color: var(--primary-800);
    box-shadow: inset 3px 0 0 var(--primary-500);
}

/* Highlight matched text */
.suggestion-item mark {
    background: var(--primary-200) !important;
    color: var(--primary-800) !important;
    padding: 2px 4px !important;
    border-radius: 3px !important;
    font-weight: 600 !important;
}

.autocomplete-no-results {
    padding: 20px 16px;
    color: var(--text-tertiary);
    font-size: 14px;
    text-align: center;
    background: var(--secondary-25);
    border-radius: var(--radius-lg);
    font-style: italic;
}

/* Loading state */
.autocomplete-loading {
    padding: 16px;
    text-align: center;
    color: var(--primary-600);
    font-size: 14px;
    background: var(--primary-25);
    border-radius: var(--radius-lg);
}

.autocomplete-loading::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 8px;
    border: 2px solid var(--primary-200);
    border-top: 2px solid var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    vertical-align: middle;
}

/* Ensure input styling works well with autocomplete */
.autocomplete-container .form-input {
    position: relative;
    z-index: 1002; /* Above suggestions */
}

.autocomplete-container .form-input:focus {
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px var(--primary-100), var(--shadow-md);
}

/* Connect input with dropdown when suggestions are showing */
.autocomplete-container.has-suggestions .form-input:focus {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border-bottom-color: transparent;
}

.autocomplete-container.has-suggestions .autocomplete-suggestions {
    border-top: 1px solid var(--primary-400);
    border-top-left-radius: 0;
    border-top-right-radius: 0;
    top: calc(100% - 1px); /* Overlap by 1px for seamless connection */
}

/* ==========================================================================
   MULTI-POINT SECTION STYLES
   ========================================================================== */

.multi-point-section {
    margin-top: var(--space-xl);
}

.section-divider {
    display: flex;
    align-items: center;
    margin: var(--space-xl) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.section-divider hr {
    flex: 1;
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 0;
}

.section-divider span {
    padding: 0 var(--space-lg);
    background: var(--surface-primary);
    white-space: nowrap;
}

.add-point-section {
    text-align: center;
    margin: var(--space-lg) 0;
}

.add-point-help {
    margin-top: var(--space-sm);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    line-height: 1.4;
}

.dynamic-point {
    background: var(--surface-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    position: relative;
    transition: all var(--transition-normal);
}

.dynamic-point:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-sm);
}

.dynamic-point-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
}

.dynamic-point-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.remove-point-btn {
    background: var(--danger-50);
    color: var(--danger-600);
    border: 1px solid var(--danger-200);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.remove-point-btn:hover {
    background: var(--danger-100);
    border-color: var(--danger-300);
    color: var(--danger-700);
}

.dynamic-point .form-grid {
    gap: var(--space-md);
}

/* Point counter styling */
.point-counter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary-100);
    color: var(--primary-700);
    border-radius: 50%;
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-right: var(--space-sm);
}

/* Readonly input styling */
.readonly-input {
    background: var(--secondary-50) !important;
    color: var(--text-secondary) !important;
    border-color: var(--secondary-200) !important;
    cursor: not-allowed !important;
    user-select: none;
    pointer-events: none;
}

.readonly-input:focus {
    box-shadow: none !important;
    border-color: var(--secondary-200) !important;
}

/* Input hint styling */
.input-hint {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--space-xs);
    font-style: italic;
    line-height: 1.3;
}

/* Auto-filled label styling */
.form-label:has(+ .readonly-input) {
    color: var(--text-secondary);
}

/* KM chaining visual indicators */
.form-group:has(.readonly-input) {
    position: relative;
}

.form-group:has(.readonly-input)::before {
    content: '🔗';
    position: absolute;
    right: 0.75rem;
    top: 2.5rem;
    font-size: var(--font-size-sm);
    opacity: 0.6;
    z-index: 5;
    pointer-events: none;
}

    /* Mobile responsive */
@media (max-width: 640px) {
    .suggestion-item {
        padding: 14px 16px;
        font-size: 16px; /* Prevent zoom on iOS */
    }
    
    .autocomplete-suggestions {
        max-height: 200px;
        box-shadow: 0 8px 25px -5px rgba(0, 0, 0, 0.15);
    }
    
    .dynamic-point {
        padding: var(--space-lg);
        margin-bottom: var(--space-md);
    }
    
    .dynamic-point-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .section-divider span {
        font-size: var(--font-size-xs);
        padding: 0 var(--space-md);
    }
}
    
    /* Compact stats cards on mobile */
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-sm);
        margin-bottom: var(--space-lg);
    }
    
    .stat-card {
        padding: var(--space-md);
        border-radius: var(--radius-lg);
    }
    
    .stat-label {
        font-size: var(--font-size-xs);
        margin-bottom: var(--space-xs);
        letter-spacing: 0.03em;
    }
    
    .stat-value {
        font-size: var(--font-size-xl);
        margin-bottom: 0;
        line-height: 1.2;
    }
    
    .dashboard-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--space-lg);
    }
    
    /* Mobile dashboard adjustments */
    .dashboard {
        padding: var(--space-lg) 0;
    }
    
    /* Compact form cards on mobile */
    .form-card {
        padding: var(--space-lg);
        margin-bottom: var(--space-lg);
        border-radius: var(--radius-lg);
    }
    
    .form-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--space-lg);
    }
    
    /* Compact header on mobile */
    .header-content {
        padding: var(--space-sm) 0;
    }
    
    .logo {
        font-size: var(--font-size-lg);
        gap: var(--space-xs);
    }
    
    .logo-icon {
        font-size: var(--font-size-xl);
    }
    
    /* Compact trip items on mobile */
    .trips-list .trip-item {
        padding: var(--space-md);
    }
    
    /* Grouped trips mobile styles */
    .trip-group {
        padding: var(--space-md) !important;
        margin-bottom: var(--space-md) !important;
    }
    
    .trip-group-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--space-sm);
        margin-bottom: var(--space-md) !important;
    }
    
    .trip-main-info {
        width: 100%;
        margin-bottom: var(--space-sm);
    }
    
    .trip-date-info {
        width: 100%;
        text-align: left !important;
    }
    
    .trip-summary {
        grid-template-columns: 1fr 1fr !important;
        gap: var(--space-sm) !important;
        padding: var(--space-sm) !important;
        margin-bottom: var(--space-md) !important;
    }
    
    .trip-summary > div:last-child {
        grid-column: 1 / -1;
    }
    
    .trip-points-list::before {
        left: 12px;
    }
    
    .trip-point-item {
        padding: var(--space-sm) !important;
        gap: var(--space-sm) !important;
        margin-bottom: var(--space-sm) !important;
    }
    
    .point-number {
        width: 28px !important;
        height: 28px !important;
        font-size: var(--font-size-xs) !important;
    }
    
    .point-metrics {
        grid-template-columns: 1fr !important;
        gap: var(--space-xs) !important;
    }
    
    .point-header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: var(--space-xs);
    }
    
    .point-note {
        padding: var(--space-xs) var(--space-sm) !important;
        font-size: var(--font-size-xs) !important;
    }
    
    /* More compact spacing overall */
    .container {
        padding: 0 var(--space-sm);
    }