/* Grayscale Palette */
:root {
    --bg-gradient-start: #e8e8e8;
    --bg-gradient-end: #f8f8f8;
    --container-bg: #ffffff;
    --input-bg: #f0f0f0;
    --button-bg: #757575;
    --button-text: #ffffff;
    --result-bg: #fafafa;
    --text-primary: #333333;
    --text-secondary: #666666;
    --error-bg: #ffebee;
    --error-text: #c62828;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"; /* System font stack */
    line-height: 1.6;
    margin: 0;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    overflow-x: hidden; /* Prevent horizontal scroll from rotations */
}

.container {
    max-width: 550px; /* Slightly smaller max-width */
    width: 100%;
    padding: 35px 40px;
    background-color: var(--container-bg);
    border-radius: 15px; 
    box-shadow: 0 6px 20px var(--shadow-color); 
    text-align: center;
    box-sizing: border-box;
    transform: rotate(-1.5deg); /* Tilt the main container */
    transition: transform 0.3s ease-out;
}

.container:hover {
    transform: rotate(0deg); /* Straighten on hover (optional) */
}

h1 {
    font-size: 1.9em;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: 10px;
}

p.description {
    color: var(--text-secondary);
    margin-bottom: 35px;
    font-size: 0.95em;
}

.input-group {
    margin-bottom: 25px;
    text-align: left;
    transform: rotate(1deg); /* Tilt input groups */
}

.input-group label {
    display: block; /* Simple label above */
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 12px 15px;
    border: none; /* No border */
    border-radius: 8px;
    background-color: var(--input-bg);
    font-size: 1em;
    color: var(--text-primary);
    outline: none;
    box-sizing: border-box;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
    transition: box-shadow 0.2s ease-out;
}

.error-message.visible {
    color: var(--error-text);
    background-color: var(--error-bg);
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

#rate-limit-timer {
    display: none;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.9);
    border-radius: 25px;
    padding: 12px 25px;
    font-size: 0.9em;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    #rate-limit-timer {
        padding: 10px 25px;
        font-size: 0.9em;
        min-width: 240px;
    }

    body {
        padding: 10px;
    }
}
.input-group input[type="number"]:focus {
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05), 0 0 0 2px rgba(117, 117, 117, 0.3); /* Focus ring */
}

/* Hide spinner buttons for number input */
.input-group input[type=number]::-webkit-inner-spin-button, 
.input-group input[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}
.input-group input[type=number] {
  -moz-appearance: textfield; /* Firefox */
  appearance: textfield; /* Standard property */
}

button#generate_button {
    display: inline-block;
    padding: 12px 35px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 25px; /* Pill shape */
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    letter-spacing: 0.5px;
    box-shadow: 0 3px 5px rgba(0,0,0,0.1);
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 10px;
    transform: rotate(-1deg); /* Tilt button */
}

button#generate_button:hover {
    background-color: #5e5e5e; /* Darker gray on hover */
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    transform: rotate(-1deg) translateY(-2px); /* Keep rotation, lift slightly */
}

button#generate_button:active {
     transform: rotate(-1deg) translateY(0px); /* Keep rotation, press down */
     box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

button#generate_button:disabled {
    background-color: #bdbdbd;
    box-shadow: none;
    cursor: not-allowed;
    transform: rotate(-1deg); /* Keep rotation */
}

.result-container {
    margin-top: 35px;
    padding: 25px;
    background-color: var(--result-bg);
    border-radius: 10px;
    text-align: left;
    opacity: 0;
    transform: translateY(15px) rotate(0.5deg); /* Initial state for transition, slight rotation */
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
    display: none; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.result-container.visible {
    opacity: 1;
    transform: translateY(0) rotate(0.5deg); /* Final state, keep rotation */
    display: block; 
}

.result-container h2 {
    font-size: 1.15em;
    font-weight: 500;
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 0;
    margin-bottom: 15px;
}

.result-container p {
    color: var(--text-primary);
    line-height: 1.7;
    white-space: pre-wrap;
    font-size: 0.95em;
}

#loading, .error-message {
    margin-top: 20px;
    padding: 12px 15px;
    border-radius: 8px;
    font-size: 0.9em;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
    display: none; /* Start hidden */
}

#loading.visible, .error-message.visible {
    opacity: 1;
    transform: translateY(0);
    display: block; /* Show */
}

#loading {
    color: var(--text-secondary);
    background-color: transparent;
    text-align: center;
    font-style: italic;
}

.error-message {
    color: var(--error-text);
    background-color: var(--error-bg);
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 25px;
        transform: rotate(0deg); /* No rotation on small screens */
    }
    .container:hover {
        transform: rotate(0deg); /* Keep straight */
    }
    h1 {
        font-size: 1.6em;
    }
    .input-group, button#generate_button, .result-container.visible {
        transform: rotate(0deg); /* No rotation for elements */
    }
    button#generate_button:hover {
         transform: translateY(-2px);
    }
    button#generate_button:active {
         transform: translateY(0px);
    }
    button#generate_button:disabled {
        transform: rotate(0deg);
    }
}