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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    /* Rainbow colors: Blue, Yellow, Red, Orange, Green, Purple */
    background: linear-gradient(
        135deg,
        #1e3a8a 0%,      /* Deep Blue */
        #fbbf24 20%,     /* Yellow */
        #ef4444 40%,     /* Red */
        #f97316 60%,     /* Orange */
        #10b981 80%,     /* Green */
        #8b5cf6 100%     /* Purple */
    );
    background-size: 400% 400%;
    animation: gradientShift 35s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 0%;
    }
    25% {
        background-position: 100% 0%;
    }
    50% {
        background-position: 100% 100%;
    }
    75% {
        background-position: 0% 100%;
    }
    100% {
        background-position: 0% 0%;
    }
}

/* Subtle overlay for better readability - keeps background from being too intense */
.animated-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.25);
    z-index: -1;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 50px 24px;
    position: relative;
    z-index: 1;
}

/* ========== HEADER ========== */
.header {
    text-align: center;
    margin-bottom: 48px;
}

.header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, #e0e0e0 50%, #f0f0f0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.1rem;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* ========== FORM CARD ========== */
.form-card {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    border-radius: 28px;
    padding: 36px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    margin-bottom: 32px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.form-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.3);
}

.input-group {
    margin-bottom: 28px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #1a1a2e;
}

.input-group select,
.input-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
    background: white;
}

.input-group select:focus,
.input-group input:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.15);
}

.input-group select:hover,
.input-group input:hover {
    border-color: #fbbf24;
}

/* ========== GENERATE BUTTON with Shimmer Effect ========== */
#generateBtn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #8b5cf6 0%, #ef4444 50%, #fbbf24 100%);
    background-size: 200% 200%;
    background-position: 0% 0%;
    color: white;
    border: none;
    border-radius: 16px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

/* Button gradient animation on hover - moves from bottom-right to top-left */
#generateBtn:hover {
    background-position: 100% 100%;
    transform: scale(1.02);
    box-shadow: 0 15px 35px -10px rgba(139, 92, 246, 0.5);
    transition: background-position 0.5s ease;
}

/* Shimmer/Glow effect that sweeps across the button */
#generateBtn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    transition: left 0.6s ease;
}

#generateBtn:hover::before {
    left: 100%;
}

#generateBtn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

#generateBtn:disabled::before {
    display: none;
}

/* ========== LOADING ========== */
.loading {
    text-align: center;
    padding: 48px;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    border-radius: 28px;
    margin-top: 24px;
}

.spinner {
    width: 56px;
    height: 56px;
    border: 4px solid #e2e8f0;
    border-top-color: #8b5cf6;
    border-right-color: #ef4444;
    border-bottom-color: #fbbf24;
    border-left-color: #10b981;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 20px;
}

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

.loading p {
    color: #4a5568;
    font-size: 1rem;
}

/* ========== RESULTS SECTION ========== */
.result-section {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(10px);
    border-radius: 28px;
    padding: 32px;
    margin-top: 32px;
    box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.4s ease;
}

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

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e2e8f0;
    flex-wrap: wrap;
    gap: 16px;
}

.result-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #1a1a2e;
}

.copy-btn {
    padding: 10px 20px;
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 40px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
    color: #8b5cf6;
}

.copy-btn:hover {
    background: linear-gradient(135deg, #8b5cf6, #ef4444);
    color: white;
    border-color: transparent;
    transform: scale(1.02);
}

.result-content {
    line-height: 1.8;
    color: #2d3748;
    white-space: pre-wrap;
    font-family: inherit;
    font-size: 1rem;
}

/* ========== PROMPT LIBRARY (COLLAPSIBLE) ========== */
.prompt-library {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 28px;
    margin-top: 32px;
    overflow: hidden;
    box-shadow: 0 10px 25px -8px rgba(0, 0, 0, 0.15);
}

.library-header {
    padding: 20px 28px;
    background: linear-gradient(135deg, #1e3a8a 0%, #8b5cf6 50%, #ef4444 100%);
    background-size: 200% 200%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-position 0.3s ease;
}

.library-header:hover {
    background-position: 100% 50%;
}

.library-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
    letter-spacing: 0.5px;
}

.library-toggle {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.library-toggle.rotated {
    transform: rotate(180deg);
}

.library-content {
    padding: 24px 28px;
    max-height: 400px;
    overflow-y: auto;
    background: white;
}

.library-content.hidden {
    display: none;
}

.prompt-category {
    margin-bottom: 28px;
}

.prompt-category:last-child {
    margin-bottom: 0;
}

.prompt-category strong {
    display: block;
    margin-bottom: 14px;
    font-size: 0.9rem;
    color: #8b5cf6;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.prompt-category code {
    display: block;
    background: #f8fafc;
    padding: 14px 16px;
    margin: 10px 0;
    border-radius: 14px;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid #e2e8f0;
    color: #2d3748;
}

.prompt-category code:hover {
    background: linear-gradient(135deg, #8b5cf6, #ef4444, #fbbf24);
    color: white;
    transform: translateX(8px);
    border-color: transparent;
}

/* ========== UTILITIES ========== */
.hidden {
    display: none;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .form-card {
        padding: 24px;
    }
    
    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .library-header {
        padding: 16px 20px;
    }
    
    .library-content {
        padding: 16px 20px;
    }
    
    .prompt-category code {
        font-size: 0.75rem;
        padding: 10px 12px;
    }
}