/* ============================================================================
   PREMIUM PROFESSIONAL DESIGN
   Clean, Minimal, Sophisticated
   ============================================================================ */

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

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

:root {
    /* Professional Color Palette - Slate & Indigo */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #6366f1;
    --accent: #0ea5e9;
    
    /* Neutrals */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadows - Subtle & Professional */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Animated Background Gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0.03;
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

/* ============================================================================
   NAVBAR - Clean & Professional
   ============================================================================ */

.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--transition-base);
}

.navbar:hover {
    box-shadow: var(--shadow-sm);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.375rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    transition: transform var(--transition-base);
}

.navbar-brand:hover {
    transform: translateY(-1px);
}

.navbar-nav {
    display: flex;
    gap: 2.5rem;
    list-style: none;
    align-items: center;
}

.navbar-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
    position: relative;
}

.navbar-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--primary);
}

.navbar-nav a:hover::after,
.navbar-nav a.active::after {
    transform: scaleX(1);
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* ============================================================================
   MAIN CONTENT
   ============================================================================ */

main {
    flex: 1;
    width: 100%;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2.5rem;
}

.container-sm {
    max-width: 960px;
}

.container-lg {
    max-width: 1600px;
}

/* ============================================================================
   BUTTONS - Premium Feel
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 0.625rem;
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.35);
    transform: translateY(-2px);
}

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

.btn-secondary {
    background: var(--bg-primary);
    color: var(--primary);
    border: 2px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* ============================================================================
   CARDS - Elevated Design
   ============================================================================ */

.card {
    background: var(--bg-primary);
    border-radius: 1.25rem;
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

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

/* ============================================================================
   AUTH PAGES - Centered Premium Cards
   ============================================================================ */

.auth-container {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-primary);
    border-radius: 1.5rem;
    padding: 3.5rem;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 480px;
    border: 1px solid var(--border-light);
    animation: slideUp 0.5s ease;
}

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

.auth-card h2 {
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.auth-card > p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-size: 0.9375rem;
}

/* Form Inputs */
input[type="email"],
input[type="password"],
input[type="text"] {
    width: 100%;
    padding: 0.875rem 1.125rem;
    border: 2px solid var(--border);
    border-radius: 0.75rem;
    font-size: 0.9375rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--bg-secondary);
}

input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

label {
    display: block;
    margin-bottom: 0.625rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    letter-spacing: 0.01em;
}

/* ============================================================================
   UPLOAD ZONE - Interactive
   ============================================================================ */

.upload-zone {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border: 3px dashed var(--border);
    border-radius: 1.25rem;
    padding: 4rem 2rem;
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.upload-zone:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.upload-zone:hover::before {
    opacity: 1;
}

.upload-zone input[type="file"] {
    display: none;
}

.upload-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    opacity: 0.6;
    transition: all var(--transition-base);
}

.upload-zone:hover .upload-icon {
    transform: scale(1.1);
    opacity: 1;
}

/* ============================================================================
   TABLE - Premium Data Display
   ============================================================================ */

.table-container {
    overflow-x: auto;
    background: var(--bg-primary);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

table {
    width: 100%;
    min-width: 800px;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.875rem;
}

table th {
    background: var(--bg-tertiary);
    padding: 1rem 1.25rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: sticky;
    top: 0;
    z-index: 10;
}

table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    transition: background var(--transition-fast);
}

table tr:last-child td {
    border-bottom: none;
}

table tr:hover td {
    background: var(--bg-secondary);
}

/* ============================================================================
   PRICING CARDS
   ============================================================================ */

.pricing-card {
    background: var(--bg-primary);
    border-radius: 1.5rem;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.pricing-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
    border-color: var(--primary);
}

.pricing-card:hover::before {
    transform: scaleX(1);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-card.featured::before {
    transform: scaleX(1);
}

.plan-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.plan-price {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.plan-price span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.plan-features {
    list-style: none;
    margin: 2rem 0;
    text-align: left;
}

.plan-features li {
    padding: 0.875rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
}

.plan-features li::before {
    content: "✓";
    color: var(--primary);
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* ============================================================================
   FOOTER - Minimal & Clean
   ============================================================================ */

.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
    padding: 2.5rem 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2.5rem;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* ============================================================================
   UTILITY & RESPONSIVE
   ============================================================================ */

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

.badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.025em;
}

.badge-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
}

.badge-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .navbar-container {
        padding: 1rem 1.5rem;
    }
    
    .navbar-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        display: none;
        gap: 1rem;
    }
    
    .navbar-nav.active {
        display: flex;
    }
    
    .navbar-toggle {
        display: block;
    }
    
    .container {
        padding: 2rem 1.5rem;
    }
    
    .auth-card {
        padding: 2.5rem;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    table {
        min-width: 600px;
    }
}

/* ============================================================================
   ANIMATIONS & EFFECTS
   ============================================================================ */

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

.fade-in {
    animation: fadeIn 0.6s ease;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection color */
::selection {
    background: rgba(79, 70, 229, 0.2);
    color: var(--text-primary);
}