:root {
    /* Color Palette - Minimal Business Luxury */
    --bg-primary: #FAF9F6;       /* Alabaster Warm White */
    --bg-secondary: #FFFFFF;     /* Pure White */
    --text-primary: #1C1A17;     /* Charcoal/Warm Black */
    --text-secondary: #5C5852;   /* Soft Muddy Gray */
    --accent-gold: #C5A880;      /* Warm Champagne Gold */
    --accent-gold-hover: #B59870;
    --accent-gold-light: #F4EFE6;
    --border-color: #E6E2DA;     /* Delicate Gray-brown border */
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(230, 226, 218, 0.5);
    --shadow: 0 10px 30px -10px rgba(28, 26, 23, 0.05);
    --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Outfit', 'Playfair Display', serif;
}

[data-theme="dark"] {
    --bg-primary: #0C0C0A;       /* Deep Obsidian Obsidian */
    --bg-secondary: #121210;     /* Rich Black */
    --text-primary: #F5F5F0;     /* Soft Ivory White */
    --text-secondary: #A6A29A;   /* Ash Gray */
    --accent-gold: #D4AF37;      /* Vivid Antique Gold */
    --accent-gold-hover: #E5C158;
    --accent-gold-light: #2D2714;
    --border-color: #24231F;     /* Subtle warm border */
    --glass-bg: rgba(18, 18, 16, 0.75);
    --glass-border: rgba(36, 35, 31, 0.5);
    --shadow: 0 15px 40px -15px rgba(0, 0, 0, 0.6);
}

/* Global Reset & Typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 500;
    letter-spacing: -0.02em;
}

/* Luxury Containers & Cards */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem;
}

.luxury-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.luxury-card:hover {
    border-color: var(--accent-gold);
}

.glassmorphism {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
}

/* Inputs & Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 2px var(--accent-gold-light);
}

/* Luxury Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.02em;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent-gold);
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: var(--accent-gold-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Header & Navbar */
.luxury-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.logo-brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.logo-brand span {
    color: var(--accent-gold);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

/* Dropzone styling as requested by instruction drag/drop */
.dropzone-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--bg-primary);
}

.dropzone-area.dragover {
    border-color: var(--accent-gold);
    background-color: var(--accent-gold-light);
}

/* Custom Premium Checkbox Styling */
.custom-checkbox-container {
    display: inline-flex;
    align-items: center;
    position: relative;
    padding-left: 2rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    font-size: 0.95rem;
    user-select: none;
    transition: var(--transition);
}

.custom-checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 1.25rem;
    width: 1.25rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: var(--transition);
}

.custom-checkbox-container:hover input ~ .checkmark {
    border-color: var(--accent-gold);
}

.custom-checkbox-container input:checked ~ .checkmark {
    background-color: var(--accent-gold);
    border-color: var(--accent-gold);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.custom-checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.custom-checkbox-container .checkmark:after {
    left: 7px;
    top: 3px;
    width: 4px;
    height: 8px;
    border: solid #FFFFFF;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Language Selection Grid and Box Styling */
.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
    max-height: 350px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
    background-color: var(--bg-primary);
}