/* Premium SaaS UI/UX Styles */
:root {
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-color: #00c6ff;
    --bg-color: #f8f9fa;
    --text-color: #343a40;
    --card-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --hover-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-bs-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --card-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --hover-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    overflow-x: hidden;
}

/* Glassmorphism & Cards */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
    transition: var(--transition);
}

.hover-lift {
    transition: var(--transition);
}
.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

/* Navbar */
.custom-navbar {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: var(--transition);
}

.custom-navbar .nav-link {
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 1rem;
}

.custom-navbar .nav-link:hover, .custom-navbar .nav-link.active {
    color: var(--primary-color) !important;
}

@media (min-width: 992px) {
    .custom-navbar .nav-link::after {
        content: '';
        position: absolute;
        width: 0;
        height: 2px;
        bottom: 0;
        left: 50%;
        background-color: var(--primary-color);
        transition: var(--transition);
        transform: translateX(-50%);
    }

    .custom-navbar .nav-link:hover::after, .custom-navbar .nav-link.active::after {
        width: 80%;
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Hero Section */
.hero-section {
    padding: 100px 0 60px;
    text-align: center;
    position: relative;
}

.hero-section h1 {
    font-weight: 800;
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}

.hero-section p.lead {
    font-size: 1.25rem;
    color: var(--text-color);
    opacity: 0.8;
    max-width: 700px;
    margin: 0 auto 40px;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 20px;
    padding: 80px 20px;
    text-align: center;
    background: rgba(13, 110, 253, 0.03);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.upload-area:hover, .upload-area.dragover {
    background: rgba(13, 110, 253, 0.08);
    border-color: var(--primary-hover);
    transform: scale(1.02);
}

.upload-area i {
    font-size: 5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.upload-area:hover i {
    transform: translateY(-10px);
}

/* Loader */
.loader-wrapper {
    display: none;
    padding: 40px 0;
}
.loader {
    border: 4px solid rgba(13, 110, 253, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border: none;
    box-shadow: 0 4px 15px rgba(13, 110, 253, 0.3);
    transition: var(--transition);
    font-weight: 600;
    border-radius: 8px;
    padding: 10px 24px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(13, 110, 253, 0.4);
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    padding-top: 60px;
}

.footer a {
    color: var(--text-color);
    opacity: 0.7;
    transition: var(--transition);
}

.footer a:hover {
    opacity: 1;
    color: var(--primary-color);
    text-decoration: none;
}

/* Scroll to top */
#scrollToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary-color);
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    border: none;
}

#scrollToTop.visible {
    opacity: 1;
    visibility: visible;
}

#scrollToTop:hover {
    background: var(--primary-hover);
    transform: translateY(-3px);
}

/* Ads Placeholders */
.ad-container {
    text-align: center;
    margin: 20px auto;
    width: 100%;
    overflow: hidden;
}

/* Responsive Fixes */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }
    .hero-section p.lead {
        font-size: 1.1rem;
    }
    .upload-area {
        padding: 50px 20px;
    }
}