/* ============================================
   RSVP Reader - Dark Theme with Red Accent
   ============================================ */

:root {
    --bg: #0a0a0a;
    --bg-elevated: #141414;
    --text: #e0e0e0;
    --text-dim: #666;
    --accent: #ff2222;
    --accent-glow: rgba(255, 34, 34, 0.3);
    --border: #222;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
}

#app {
    width: 100%;
    height: 100%;
    max-width: 100vw;
    max-height: 100vh;
    position: relative;
}

/* ============================================
   Screens
   ============================================ */

.screen {
    display: none;
    width: 100%;
    height: 100%;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.screen.active {
    display: flex;
}

/* ============================================
   Upload Screen
   ============================================ */

#upload-screen h1 {
    font-size: 4rem;
    font-weight: 200;
    letter-spacing: 0.3em;
    margin-bottom: 0.25em;
}

#upload-screen h1 .accent {
    color: var(--accent);
}

.tagline {
    color: var(--text-dim);
    font-size: 1rem;
    margin-bottom: 3rem;
    letter-spacing: 0.1em;
}

#drop-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 3rem 4rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-elevated);
}

#drop-zone:hover,
#drop-zone.drag-over {
    border-color: var(--accent);
    box-shadow: 0 0 30px var(--accent-glow);
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

#drop-zone p {
    margin-bottom: 0.5rem;
}

.formats {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem !important;
}

.btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px var(--accent-glow);
}

#loading {
    text-align: center;
}

#loading.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1rem;
}

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

/* ============================================
   Reader Screen
   ============================================ */

#reader-screen {
    justify-content: space-between;
    padding: 2rem;
}

#word-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    position: relative;
}

#word-display {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 400;
    letter-spacing: 0.05em;
    white-space: nowrap;
    position: relative;
    cursor: pointer;
    user-select: none;
}

#word-before,
#word-after {
    color: var(--text);
}

#word-orp {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent-glow);
    font-weight: 600;
}

#orp-marker {
    color: var(--accent);
    font-size: 1rem;
    margin-top: 0.5rem;
    opacity: 0.6;
}

/* ============================================
   Progress
   ============================================ */

#progress-container {
    width: 100%;
    max-width: 600px;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

#progress-bar {
    flex: 1;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

#progress-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: var(--progress, 0%);
    background: var(--accent);
    transition: width 0.1s ease;
}

#progress-text {
    font-size: 0.85rem;
    color: var(--text-dim);
    min-width: 3rem;
    text-align: right;
}

/* ============================================
   Stats
   ============================================ */

#stats-container {
    width: 100%;
    max-width: 600px;
    margin-bottom: 1.5rem;
    text-align: center;
}

#stats-display {
    font-size: 0.9rem;
    color: var(--text-dim);
    padding: 0.5rem;
}

#time-remaining {
    color: var(--text);
    font-weight: 500;
}

#words-remaining {
    color: var(--text-dim);
}

/* ============================================
   Controls
   ============================================ */

#controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.ctrl-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ctrl-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.ctrl-btn.play {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.ctrl-btn.play:hover {
    transform: scale(1.1);
    box-shadow: 0 0 20px var(--accent-glow);
}

.ctrl-btn.play.playing {
    background: var(--bg-elevated);
    color: var(--accent);
}

#wpm-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: 1rem;
}

#wpm-slider {
    width: 120px;
    accent-color: var(--accent);
}

#wpm-display {
    font-size: 0.85rem;
    color: var(--text-dim);
    min-width: 5rem;
}

#close-btn {
    margin-left: 1rem;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
    #upload-screen h1 {
        font-size: 2.5rem;
    }
    
    #drop-zone {
        padding: 2rem;
        width: 100%;
    }
    
    #controls {
        gap: 0.5rem;
    }
    
    .ctrl-btn {
        width: 40px;
        height: 40px;
    }
    
    .ctrl-btn.play {
        width: 56px;
        height: 56px;
    }
    
    #wpm-control {
        margin-left: 0;
        margin-top: 0.5rem;
        width: 100%;
        justify-content: center;
    }
    
    #wpm-slider {
        width: 150px;
    }
}

/* ============================================
   Utilities
   ============================================ */

.hidden {
    display: none !important;
}

/* ============================================
   Visit Counter
   ============================================ */

.visit-counter {
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-dim);
    opacity: 0.6;
}

#visit-count {
    color: var(--accent);
    font-weight: 500;
}