/**
 * Principia - Main Stylesheet
 * 
 * Design system:
 * - Dark theme (#0a0a0a background)
 * - Cormorant Garamond for typography
 * - Minimal, clean aesthetic
 */

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-bg: #0a0a0a;
    --color-text: #e8e8e8;
    --color-text-dim: #444;
    --color-error: #ff4444;
    
    /* Typography */
    --font-primary: 'Cormorant Garamond', serif;
    
    /* Spacing */
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
}

html {
    font-size: 16px;
}

body {
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    line-height: 1.5;
}

/* ========== Starfield Canvas ========== */
#stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ========== Layout ========== */
main {
    position: relative;
    z-index: 1;
    text-align: center;
}

/* ========== Typography ========== */
.logo {
    font-weight: 300;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

/* ========== Buttons & Links ========== */
.btn {
    display: inline-block;
    background: transparent;
    border: 1px solid var(--color-text-dim);
    color: var(--color-text);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: lowercase;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

.link {
    color: var(--color-text-dim);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========== Forms ========== */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    min-width: 260px;
}

.input {
    background: transparent;
    border: 1px solid var(--color-text-dim);
    color: var(--color-text);
    padding: 0.75rem 1rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-align: center;
    outline: none;
    transition: border-color var(--transition-fast);
}

.input:focus {
    border-color: var(--color-text);
}

.input::placeholder {
    color: var(--color-text-dim);
}

.error-message {
    color: var(--color-error);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    min-height: 1.2em;
    margin-top: var(--space-sm);
}

/* ========== Positioned Elements ========== */
.pos-bottom-center {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.pos-top-left {
    position: fixed;
    top: 40px;
    left: 40px;
    z-index: 2;
}

.pos-top-right {
    position: fixed;
    top: 40px;
    right: 40px;
    z-index: 2;
}

/* ========== Responsive ========== */
@media (max-width: 600px) {
    .form {
        min-width: 220px;
    }
    
    .pos-bottom-center {
        bottom: 24px;
    }
    
    .pos-top-left {
        top: 24px;
        left: 24px;
    }
}