/* =============================================================================
   T&D Construction & Renovation - Main Stylesheet
   ============================================================================= */

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - T&D Luxury Branding */
    --primary-color: #FFD700;
    --primary-hover: #FFC700;
    --secondary-color: #2C1810;
    --accent-color: #B8860B;
    --luxury-gold: #D4AF37;
    --dark-wood: #3D2914;
    --kerala-red: #8B4513;
    --warm-cream: #FFF8DC;
    --construction-orange: #FF8C00;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Neutral Colors */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

/* Base Styles */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--secondary-color);
    background: linear-gradient(135deg, 
        #8B4513 0%, 
        #D2691E 25%, 
        #F4A460 50%, 
        #DEB887 75%, 
        #FFF8DC 100%);
    background-attachment: fixed;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 69, 19, 0.1) 0%, transparent 50%),
        linear-gradient(45deg, transparent 40%, rgba(255, 215, 0, 0.05) 50%, transparent 60%);
    background-size: 300px 300px, 400px 400px, 200px 200px;
    pointer-events: none;
    z-index: -1;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-6) var(--spacing-4);
    position: relative;
}

.section {
    margin-bottom: var(--spacing-8);
}

.hidden {
    display: none !important;
}

/* Kerala Traditional Pattern Overlay */
.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255, 215, 0, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(139, 69, 19, 0.05) 0%, transparent 50%);
    background-size: 100px 100px;
    pointer-events: none;
    z-index: 0;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-6) var(--spacing-8);
    background: linear-gradient(135deg, rgba(44, 24, 16, 0.95) 0%, rgba(61, 41, 20, 0.95) 100%);
    border-bottom: 3px solid var(--primary-color);
    border-top: 3px solid var(--luxury-gold);
    margin-bottom: var(--spacing-8);
    min-height: 140px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 215, 0, 0.2);
    backdrop-filter: blur(10px);
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(255, 215, 0, 0.05) 40%, transparent 60%),
        radial-gradient(ellipse at center, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.company-info {
    flex: 1;
}

.company-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
    padding: var(--spacing-6);
    background: linear-gradient(135deg, 
        rgba(255, 248, 220, 0.15) 0%, 
        rgba(255, 215, 0, 0.1) 50%, 
        rgba(255, 248, 220, 0.15) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 215, 0, 0.3);
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    position: relative;
    overflow: hidden;
}

.company-logo::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 25%, 
        var(--primary-color) 50%, 
        var(--luxury-gold) 75%, 
        var(--primary-color) 100%);
    border-radius: var(--radius-xl);
    animation: borderGlow 3s ease-in-out infinite alternate;
    z-index: -1;
}

@keyframes borderGlow {
    0% { opacity: 0.3; }
    100% { opacity: 0.7; }
}

.logo-placeholder {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

/* When actual logo is provided, this class can replace logo-placeholder */
.company-logo-img {
    width: 150px;
    height: 100px;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(255, 215, 0, 0.4);
    flex-shrink: 0;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(255, 248, 220, 0.95) 100%);
    padding: var(--spacing-3);
    border: 3px solid rgba(255, 215, 0, 0.6);
    transition: all 0.3s ease;
    filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.3));
}

.company-logo-img:hover {
    transform: scale(1.05);
    box-shadow: 
        0 12px 32px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(255, 215, 0, 0.6);
    filter: drop-shadow(0 0 20px rgba(255, 215, 0, 0.5));
}

.invoice-logo .company-logo-img,
.invoice-logo .logo-placeholder {
    width: 120px;
    height: 80px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.logo-text {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 1px;
}

.company-text {
    flex: 1;
    z-index: 2;
}

.company-name {
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    font-weight: 800;
    color: var(--warm-cream);
    margin-bottom: var(--spacing-2);
    text-shadow: 
        2px 2px 4px rgba(0, 0, 0, 0.5),
        0 0 20px rgba(255, 215, 0, 0.6),
        0 0 40px rgba(255, 215, 0, 0.3);
    background: linear-gradient(135deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 30%, 
        var(--warm-cream) 70%, 
        var(--primary-color) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    font-family: 'Georgia', 'Times New Roman', serif;
    letter-spacing: 2px;
    text-transform: uppercase;
    position: relative;
}

.company-name::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--primary-color) 30%, 
        var(--luxury-gold) 70%, 
        transparent 100%);
    border-radius: 2px;
}

.company-tagline {
    color: var(--warm-cream);
    font-size: clamp(0.9rem, 2vw, 1.3rem);
    font-weight: 500;
    font-style: italic;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    letter-spacing: 1px;
    font-family: 'Georgia', serif;
    opacity: 0.95;
    margin-top: var(--spacing-3);
}

.header-actions {
    display: flex;
    gap: var(--spacing-4);
    align-items: center;
    padding: var(--spacing-4);
    background: linear-gradient(135deg, 
        rgba(255, 215, 0, 0.1) 0%, 
        rgba(44, 24, 16, 0.2) 50%, 
        rgba(255, 215, 0, 0.1) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 215, 0, 0.3);
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 215, 0, 0.2);
    backdrop-filter: blur(5px);
    position: relative;
    z-index: 2;
}

.header-actions::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    background: linear-gradient(45deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 25%, 
        var(--primary-color) 50%, 
        var(--luxury-gold) 75%, 
        var(--primary-color) 100%);
    border-radius: var(--radius-xl);
    opacity: 0.4;
    z-index: -1;
    animation: actionGlow 3s ease-in-out infinite alternate;
}

@keyframes actionGlow {
    0% { opacity: 0.4; }
    100% { opacity: 0.6; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
}

h2 {
    font-size: var(--font-size-2xl);
    color: var(--gray-800);
}

h3 {
    font-size: var(--font-size-xl);
    color: var(--gray-700);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-decoration: none;
    line-height: 1;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

.btn-primary {
    background: linear-gradient(135deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 30%, 
        var(--primary-color) 70%, 
        var(--accent-color) 100%);
    color: var(--secondary-color);
    font-weight: 700;
    border: 2px solid var(--luxury-gold);
    box-shadow: 
        0 6px 20px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2),
        0 0 10px rgba(255, 215, 0, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.2) 50%, 
        transparent 100%);
    transition: left 0.5s ease;
}

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

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, 
        var(--luxury-gold) 0%, 
        var(--primary-color) 30%, 
        var(--luxury-gold) 70%, 
        var(--primary-color) 100%);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 12px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 20px rgba(255, 215, 0, 0.5);
    border-color: var(--primary-color);
}

.btn-secondary {
    background: linear-gradient(135deg, 
        var(--dark-wood) 0%, 
        var(--secondary-color) 50%, 
        var(--kerala-red) 100%);
    color: var(--warm-cream);
    border: 2px solid var(--luxury-gold);
    box-shadow: 
        0 6px 20px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 215, 0, 0.15),
        0 0 10px rgba(139, 69, 19, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 215, 0, 0.2) 50%, 
        transparent 100%);
    transition: left 0.5s ease;
}

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

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, 
        var(--kerala-red) 0%, 
        var(--dark-wood) 50%, 
        var(--secondary-color) 100%);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 12px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 215, 0, 0.3),
        0 0 20px rgba(255, 215, 0, 0.4);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
}

.btn-outline {
    background: linear-gradient(135deg, 
        rgba(44, 24, 16, 0.95) 0%, 
        rgba(61, 41, 20, 0.95) 100%);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 215, 0, 0.2);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.btn-outline:hover:not(:disabled) {
    background: linear-gradient(135deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 100%);
    color: var(--secondary-color);
    border-color: var(--luxury-gold);
    transform: translateY(-2px);
    box-shadow: 
        0 8px 25px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2),
        0 0 15px rgba(255, 215, 0, 0.4);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
}

.icon {
    font-size: var(--font-size-sm);
}

/* Form Styles */
.form-container {
    background: linear-gradient(135deg, 
        rgba(255, 248, 220, 0.95) 0%, 
        rgba(245, 222, 179, 0.95) 50%, 
        rgba(255, 248, 220, 0.95) 100%);
    padding: var(--spacing-10);
    border-radius: var(--radius-xl);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 30px rgba(255, 215, 0, 0.1);
    border: 3px solid rgba(255, 215, 0, 0.3);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 1;
}

.form-container::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 25%, 
        var(--primary-color) 50%, 
        var(--luxury-gold) 75%, 
        var(--primary-color) 100%);
    border-radius: var(--radius-xl);
    opacity: 0.3;
    z-index: -1;
    animation: borderShimmer 4s ease-in-out infinite alternate;
}

@keyframes borderShimmer {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 0.6; transform: scale(1.01); }
}

.form-group-container {
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-6);
    border-bottom: 1px solid var(--gray-200);
}

.form-group-container:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-4);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-shadow: 1px 1px 2px rgba(255, 215, 0, 0.2);
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: var(--spacing-4);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(255, 248, 220, 0.95) 100%);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.1),
        0 2px 8px rgba(255, 215, 0, 0.1);
    transition: all 0.3s ease;
    color: var(--secondary-color);
    font-weight: 500;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.1),
        0 0 20px rgba(255, 215, 0, 0.3),
        0 4px 16px rgba(255, 215, 0, 0.2);
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 1) 0%, 
        rgba(255, 248, 220, 1) 100%);
    transform: scale(1.02);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
}

/* Line Items */
.line-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr auto;
    gap: var(--spacing-4);
    align-items: end;
    padding: var(--spacing-5);
    background: linear-gradient(135deg, 
        rgba(255, 248, 220, 0.8) 0%, 
        rgba(255, 255, 255, 0.9) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-4);
    border: 2px solid rgba(255, 215, 0, 0.3);
    box-shadow: 
        0 8px 16px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    position: relative;
}

.line-item:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 24px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        0 0 15px rgba(255, 215, 0, 0.2);
    border-color: var(--primary-color);
}

.remove-item-btn {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color 0.2s ease-in-out;
}

.remove-item-btn:hover {
    background-color: #dc2626;
}

/* Invoice Summary */
.invoice-summary {
    background: linear-gradient(135deg, 
        rgba(139, 69, 19, 0.95) 0%, 
        rgba(61, 41, 20, 0.95) 50%, 
        rgba(44, 24, 16, 0.95) 100%);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    margin-top: var(--spacing-6);
    border: 3px solid var(--primary-color);
    box-shadow: 
        0 15px 35px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 215, 0, 0.2),
        0 0 25px rgba(255, 215, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.invoice-summary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at top, rgba(255, 215, 0, 0.1) 0%, transparent 70%),
        radial-gradient(ellipse at bottom, rgba(255, 215, 0, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3) 0;
    font-size: var(--font-size-lg);
    color: var(--dark-brown);
    font-weight: 600;
    text-shadow: 1px 1px 2px rgba(255, 215, 0, 0.3);
    border-bottom: 1px solid rgba(255, 215, 0, 0.2);
    position: relative;
    z-index: 1;
}

.summary-row.total {
    border-top: 3px solid var(--primary-color);
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-4);
    font-weight: 800;
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    text-shadow: 
        2px 2px 4px rgba(0, 0, 0, 0.5),
        0 0 15px rgba(255, 215, 0, 0.6);
    background: linear-gradient(135deg, 
        rgba(255, 215, 0, 0.2) 0%, 
        rgba(212, 175, 55, 0.2) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    border-bottom: none;
    animation: totalGlow 2s ease-in-out infinite alternate;
}

@keyframes totalGlow {
    0% { box-shadow: inset 0 0 20px rgba(255, 215, 0, 0.2); }
    100% { box-shadow: inset 0 0 30px rgba(255, 215, 0, 0.4); }
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--spacing-3);
    justify-content: flex-end;
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--gray-200);
}

/* Preview Section */
.preview-container,
.list-container {
    background: linear-gradient(135deg, 
        rgba(255, 248, 220, 0.98) 0%, 
        rgba(245, 222, 179, 0.98) 50%, 
        rgba(255, 248, 220, 0.98) 100%);
    padding: var(--spacing-10);
    border-radius: var(--radius-xl);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 30px rgba(255, 215, 0, 0.15);
    border: 2px solid rgba(255, 215, 0, 0.4);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 1;
}

.preview-container::before,
.list-container::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -1px;
    right: -1px;
    bottom: -1px;
    background: linear-gradient(45deg, 
        var(--primary-color) 0%, 
        var(--luxury-gold) 25%, 
        var(--primary-color) 50%, 
        var(--luxury-gold) 75%, 
        var(--primary-color) 100%);
    border-radius: var(--radius-xl);
    opacity: 0.2;
    z-index: -1;
    animation: containerGlow 3s ease-in-out infinite alternate;
}

@keyframes containerGlow {
    0% { opacity: 0.2; }
    100% { opacity: 0.4; }
}

.preview-header,
.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--gray-200);
}

/* Invoice Template */
.invoice-template {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.98) 0%, 
        rgba(255, 248, 220, 0.98) 50%, 
        rgba(255, 255, 255, 0.98) 100%);
    padding: var(--spacing-10);
    border: 3px solid var(--primary-color);
    border-radius: var(--radius-xl);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        0 0 40px rgba(255, 215, 0, 0.15);
    position: relative;
    backdrop-filter: blur(10px);
}

.invoice-template::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 10% 10%, rgba(255, 215, 0, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(139, 69, 19, 0.05) 0%, transparent 40%);
    border-radius: var(--radius-xl);
    pointer-events: none;
}

.invoice-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-10);
    margin-bottom: var(--spacing-10);
    padding-bottom: var(--spacing-8);
    border-bottom: 4px solid var(--primary-color);
    background: linear-gradient(135deg, 
        rgba(255, 215, 0, 0.1) 0%, 
        transparent 50%, 
        rgba(139, 69, 19, 0.1) 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    position: relative;
}

.invoice-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 20%;
    width: 60%;
    height: 4px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--luxury-gold) 30%, 
        var(--primary-color) 50%, 
        var(--luxury-gold) 70%, 
        transparent 100%);
    border-radius: 2px;
}

.invoice-company {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
}

.invoice-logo .logo-placeholder {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-lg);
}

.company-details h1 {
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-2);
}

.company-details .tagline {
    color: var(--gray-600);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-3);
}

.contact-info {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.contact-info p {
    margin: var(--spacing-1) 0;
}

.invoice-details {
    text-align: right;
}

.invoice-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.invoice-to h4,
.invoice-project h4 {
    color: var(--gray-700);
    margin-bottom: var(--spacing-3);
    text-transform: uppercase;
    font-size: var(--font-size-sm);
    letter-spacing: 0.5px;
}

/* Invoice Table */
.invoice-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-8);
}

.invoice-table th,
.invoice-table td {
    padding: var(--spacing-3);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.invoice-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.5px;
}

.invoice-table td.text-right,
.invoice-table th.text-right {
    text-align: right;
}

.invoice-totals {
    margin-left: auto;
    width: 300px;
}

.invoice-totals .summary-row {
    border-bottom: 1px solid var(--gray-200);
}

.invoice-totals .summary-row.total {
    background: var(--secondary-color);
    color: var(--primary-color);
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
    border-bottom: none;
    font-weight: 700;
    border: 2px solid var(--primary-color);
}

/* Invoices List */
.invoices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-4);
}

.invoice-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    transition: all 0.2s ease-in-out;
}

.invoice-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.invoice-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-4);
}

.invoice-card h4 {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-1);
}

.invoice-card-meta {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.invoice-card-amount {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-800);
}

.invoice-card-actions {
    display: flex;
    gap: var(--spacing-2);
    margin-top: var(--spacing-4);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-16) var(--spacing-4);
    color: var(--gray-500);
}

.empty-state .icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-4) var(--spacing-3);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-6);
        text-align: center;
        padding: var(--spacing-8) var(--spacing-4);
        min-height: auto;
    }

    .company-logo {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-4);
        padding: var(--spacing-5);
    }

    .company-logo-img {
        width: 120px;
        height: 80px;
    }

    .company-name {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
        letter-spacing: 1px;
    }

    .company-tagline {
        font-size: clamp(0.8rem, 3vw, 1.1rem);
    }

    .form-container {
        padding: var(--spacing-6);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .line-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
        padding: var(--spacing-4);
    }

    .invoice-header {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-6);
    }

    .invoice-company {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: var(--spacing-4);
    }

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

    .invoice-info {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
        gap: var(--spacing-4);
    }

    .invoice-card-actions {
        flex-direction: column;
    }

    .invoices-grid {
        grid-template-columns: 1fr;
    }

    .summary-row {
        font-size: var(--font-size-base);
    }

    .summary-row.total {
        font-size: var(--font-size-xl);
    }

    .header-actions {
        flex-direction: column;
        gap: var(--spacing-3);
        align-items: center;
        width: 100%;
    }

    .header-actions .btn-secondary {
        width: 100%;
        max-width: 280px;
        padding: var(--spacing-3) var(--spacing-6);
        font-size: var(--font-size-base);
        text-align: center;
    }

    .preview-container,
    .list-container {
        padding: var(--spacing-4);
        margin: var(--spacing-4) 0;
    }

    .invoice-template {
        padding: var(--spacing-4);
    }

    .preview-header,
    .list-header {
        flex-direction: column;
        gap: var(--spacing-3);
        text-align: center;
    }

    .invoice-header {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
        text-align: center;
        padding: var(--spacing-4);
    }

    .invoice-details {
        text-align: center;
        margin-bottom: var(--spacing-4);
    }

    .invoice-table {
        font-size: var(--font-size-sm);
        overflow-x: auto;
        display: block;
        white-space: nowrap;
    }

    .invoice-table th,
    .invoice-table td {
        padding: var(--spacing-2) var(--spacing-1);
        font-size: var(--font-size-sm);
    }

    .invoice-totals {
        margin-top: var(--spacing-6);
    }
}

@media (max-width: 480px) {
    .invoice-table {
        font-size: var(--font-size-sm);
    }
    
    .invoice-table th,
    .invoice-table td {
        padding: var(--spacing-2);
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    .header,
    .form-actions,
    .preview-header,
    .btn {
        display: none !important;
    }

    .invoice-template {
        border: none;
        box-shadow: none;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}