/* Premium Variables & Global Tokens */
:root {
    --bg-base: #030408;                  /* Ink-black base layout */
    --bg-surface: rgba(10, 12, 20, 0.65); /* Translucent surface layer with minor deep navy tint */
    --border-premium: rgba(255, 255, 255, 0.04); /* Subdued premium layout division lines */
    
    /* Stark Monochrome Typography Palette */
    --text-primary: #ffffff;
    --text-secondary: #878c9e;           /* Elegant metallic desaturated grey */
    --text-hover: #e2e8f0;
    
    /* Luxury Identity Elements */
    --accent-pure: #ffffff;              /* Stark high-luxury white token */
    --blue-tint-subtle: rgba(59, 130, 246, 0.05); /* Faint blue backdrop echo */
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    letter-spacing: -0.015em; 
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-base);
    min-height: 100vh;
    width: 100vw;
    position: relative;
    overflow-x: hidden;
}

/* Premium Cursor Ambient Glow Overlay - Deep Steel Blue Trace */
.cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none; 
    z-index: 1; 
    background: radial-gradient(
        700px circle at var(--x, 0px) var(--y, 0px), 
        rgba(255, 255, 255, 0.02), 
        rgba(37, 99, 235, 0.015) 35%,
        transparent 70%
    );
    transition: background 0.1s ease-out; 
}

/* Glassmorphic Topbar Navigation Header */
.topbar {
    position: sticky;
    top: 0;
    z-index: 1000; 
    background-color: var(--bg-surface);
    backdrop-filter: blur(16px); 
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 3rem;
    border-bottom: 1px solid var(--border-premium);
}

/* Brand Layout */
.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
}

.brand span {
    background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-box {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f111a 0%, #05060b 100%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.6);
}

.logo-box i {
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Central Navigation Links */
.nav-links {
    display: flex;
    align-items: center;
    gap: 2.2rem; 
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover {
    color: var(--text-primary);
}

/* Account Entry Buttons */
.auth-buttons {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.btn {
    padding: 0.55rem 1.15rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-login {
    color: var(--text-secondary);
    background: transparent;
}

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

.btn-signup {
    background-color: var(--accent-pure);
    color: #030408; 
    border: 1px solid var(--accent-pure);
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.08);
}

.btn-signup:hover {
    background-color: #f1f5f9;
    border-color: #f1f5f9;
    transform: translateY(-1px); 
    box-shadow: 0 4px 16px rgba(255, 255, 255, 0.15);
}