/* ===================================
   LETSINVOICE - DARK GLASSMORPHISM THEME
   Modern Dark Theme with Glass Effects
   =================================== */

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

:root {
    /* Light Grey Theme Colors */
    --bg-primary: #f5f5f7;
    --bg-secondary: #e8e8ed;
    --bg-tertiary: #d1d1d6;

    /* Glass Effect Colors */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-hover: rgba(255, 255, 255, 0.9);

    /* Accent Colors */
    --accent-primary: #0071e3;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #0071e3 0%, #7c3aed 100%);

    /* Status Colors */
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;

    /* Text Colors */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-muted: #86868b;
    --text-color: #1d1d1f;

    /* Layout Colors */
    --light-bg: #f5f5f7;
    --border-color: #d1d1d6;

    /* Alias for compatibility */
    --primary-color: #0071e3;
    --primary-dark: #005bb5;

    /* Other */
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    background-image:
        radial-gradient(at 0% 0%, rgba(124, 58, 237, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 212, 255, 0.1) 0px, transparent 50%);
    background-attachment: fixed;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   GLASS EFFECT COMPONENTS
   =================================== */

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.glass-card:hover {
    background: var(--glass-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

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

.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-menu a:hover {
    color: var(--accent-primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

/* ===================================
   BUTTONS
   =================================== */

.btn-primary, .btn-secondary {
    padding: 0.75rem 1.75rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.05rem;
}

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

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    padding: 8rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.hero-note {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===================================
   FEATURES SECTION
   =================================== */

.features {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.section-title {
    text-align: center;
    font-size: 2.75rem;
    margin-bottom: 1rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.15rem;
    margin-bottom: 4rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature-card:hover {
    background: var(--glass-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 700;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   PRICING SECTION
   =================================== */

.pricing {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.pricing-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    background: var(--glass-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-10px) scale(1.02);
}

.pricing-card.popular {
    border-color: var(--accent-primary);
    border-width: 2px;
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.2);
}

.popular-badge {
    background: var(--accent-gradient);
    color: var(--text-primary);
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

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

.plan-price {
    margin-bottom: 2rem;
}

.plan-price .currency {
    font-size: 1.5rem;
    vertical-align: top;
    color: var(--accent-primary);
}

.plan-price .price {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.plan-features {
    list-style: none;
    margin-bottom: 2.5rem;
    text-align: left;
}

.plan-features li {
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.95rem;
}

.plan-features li:last-child {
    border-bottom: none;
}

.plan-features .included {
    color: var(--text-secondary);
}

.plan-features .excluded {
    color: var(--text-muted);
    opacity: 0.5;
}

.plan-note {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ===================================
   ABOUT SECTION
   =================================== */

.about {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

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

.about-item h3 {
    font-size: 1.75rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.about-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   CTA SECTION
   =================================== */

.cta {
    padding: 6rem 0;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    border-top: 1px solid var(--glass-border);
    padding: 4rem 0 1.5rem;
    position: relative;
    z-index: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    margin-bottom: 1.25rem;
    font-size: 1.15rem;
    color: var(--text-primary);
    font-weight: 700;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-section a:hover {
    color: var(--accent-primary);
}

.footer-section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   FORM STYLES
   =================================== */

.form-container {
    max-width: 500px;
    margin: 3rem auto;
    padding: 2.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
}

.form-group {
    margin-bottom: 1.75rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    font-size: 1rem;
    transition: var(--transition);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
}

.form-error {
    color: var(--danger-color);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border-color: var(--success-color);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
    border-color: var(--info-color);
}

/* ===================================
   DASHBOARD STYLES
   =================================== */

.dashboard {
    min-height: 100vh;
}

.dashboard-header {
    background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(248,250,252,0.95));
    backdrop-filter: blur(10px);
    padding: 1.25rem 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.dashboard-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dashboard-nav .logo a {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.dashboard-nav .logo a:hover {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 260px;
    height: 100vh;
    background: linear-gradient(180deg, #1a202c 0%, #2d3748 50%, #1a202c 100%);
    border-right: 1px solid rgba(102, 126, 234, 0.1);
    padding: 2rem 0;
    padding-top: 80px;
    overflow-y: auto;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    z-index: 50;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(102,126,234,0.03)"/></svg>');
    background-size: 20px 20px;
    opacity: 0.5;
    pointer-events: none;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 1rem 1.75rem;
    color: #cbd5e0;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
    font-weight: 500;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-left: 3px solid var(--accent-primary);
}

.dashboard-content {
    margin-left: 260px;
    padding: 2.5rem;
    min-height: 100vh;
    background: linear-gradient(135deg, #f8fafc 0%, #e8eef5 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: white;
    border: 1px solid #e5e7eb;
    padding: 1.5rem;
    border-radius: 12px;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.stat-card:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    transform: translateY(-2px);
}

.stat-card h3 {
    color: #6b7280;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card small {
    color: #9ca3af;
    font-size: 0.875rem;
}

/* ===================================
   TABLE STYLES
   =================================== */

.table-container {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-x: auto;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid #e5e7eb;
    color: #374151;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: #f9fafb;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid #f3f4f6;
    color: #1f2937;
}

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

table tr:hover {
    background: #f9fafb;
}

.badge {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning-color);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
}

.badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--info-color);
}

.badge-secondary {
    background: rgba(160, 160, 176, 0.15);
    color: var(--text-secondary);
}

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(15, 15, 35, 0.98);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 2rem 0;
        border-top: 1px solid var(--glass-border);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero p {
        font-size: 1.05rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .dashboard-content {
        margin-left: 0;
        padding: 1.5rem;
    }

    .sidebar {
        display: none;
    }

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

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

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.section-box {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.section-box h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.section-box p {
    color: var(--text-secondary);
    line-height: 1.7;
}