:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --accent: #00ff88;
    --accent-glow: rgba(0, 255, 136, 0.4);
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border: #333333;
    --error: #ff4444;
    --success: #00ff88;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    max-width: 100%;
    margin: 0 auto;
    width: 100%;
}

.app-header {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeIn 0.6s ease-out;
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #00ccff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.prompt-container {
    flex: 1;
    margin-bottom: 20px;
    animation: slideUp 0.5s ease-out;
}

.prompt-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    min-height: 300px;
    position: relative;
    transition: all 0.3s ease;
}

.prompt-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
}

.word-counter {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    background: rgba(0, 255, 136, 0.1);
    padding: 4px 10px;
    border-radius: 12px;
}

.prompt-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
    margin-top: 30px;
    font-family: 'Courier New', monospace;
}

.controls {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.generate-btn, .copy-btn {
    padding: 18px 24px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}

.generate-btn {
    background: linear-gradient(135deg, var(--accent), #00ccff);
    color: var(--bg-primary);
    box-shadow: 0 4px 15px rgba(0, 255, 136, 0.3);
}

.generate-btn:active {
    transform: scale(0.96);
    box-shadow: 0 2px 8px rgba(0, 255, 136, 0.2);
}

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

.copy-btn:active {
    transform: scale(0.96);
}

.copy-btn.success {
    background: var(--success);
    color: var(--bg-primary);
    border-color: var(--success);
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--accent);
    color: var(--bg-primary);
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }
    
    .prompt-card {
        padding: 16px;
        min-height: 250px;
    }
    
    .prompt-text {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    .controls {
        grid-template-columns: 1fr;
    }
    
    .generate-btn, .copy-btn {
        padding: 16px 20px;
        font-size: 1rem;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 700px;
    }
}