@import url('https://fonts.googleapis.com/css2?family=Courier+Prime:wght@400;700&family=Special+Elite&family=Inter:wght@400;700&display=swap');

/* ===================================
   CSS Custom Properties (Design Tokens)
   =================================== */
:root {
    /* Colors */
    --bg-color: #8d6e63; 
    --machine-color: #222;
    --machine-shadow: #1a2429;
    --paper-color: #fff9f0;
    --text-color: #212121;
    --text-muted: #666;
    --ink-faded: #424242;
    --error-color: #e53935;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --accent-gold: #ffb300;
    --key-cap: #eceff1;
    --key-stem: #546e7a;
    
    /* Typography */
    --font-typewriter: 'Courier Prime', monospace;
    --font-vintage: 'Special Elite', cursive;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-modal: 100;
    --z-toast: 200;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-color);
    background-image: 
        repeating-linear-gradient(90deg, transparent 0, transparent 50px, rgba(0,0,0,0.05) 50px, rgba(0,0,0,0.05) 52px),
        linear-gradient(to bottom, #8d6e63, #6d4c41);
    color: var(--text-color);
    font-family: var(--font-vintage);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    padding-bottom: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--accent-gold);
    outline-offset: 2px;
}

/* Remove focus outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gold);
    color: var(--machine-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-weight: 600;
    text-decoration: none;
    z-index: var(--z-modal);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
}

/* ===================================
   Loading Overlay
   =================================== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    transition: opacity var(--transition-normal);
}

.loading-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--paper-color);
    border-top-color: var(--accent-gold);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    margin-top: var(--spacing-md);
    color: var(--paper-color);
    font-family: var(--font-vintage);
    font-size: 1.1rem;
}

/* ===================================
   Layout
   =================================== */
.desk {
    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    width: 100%;
    height: 100%;
}

/* ===================================
   Utility Classes
   =================================== */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===================================
   Mobile Input
   =================================== */
.mobile-input {
    opacity: 0;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
    pointer-events: none;
}

/* ===================================
   Modal Styles
   =================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--paper-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    animation: modalIn var(--transition-normal);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-content h3 {
    font-family: var(--font-vintage);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.modal-content p {
    font-family: var(--font-sans);
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ===================================
   Toast Notifications
   =================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--machine-color);
    color: #fff;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    animation: toastIn var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast.fade-out {
    animation: toastOut var(--transition-normal) forwards;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* Timer unit styling */
.timer-unit {
    font-size: 0.7em;
    opacity: 0.7;
    margin-left: 2px;
}