/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

/* App container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header styles */
.header {
    text-align: center;
    padding: 2rem 1rem;
    color: white;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

/* Main content */
.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    flex: 1;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
}

/* Sections */
.input-section, .output-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Card styles */
.card {
    background: var(--card-background);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Keyword input */
.keyword-input-container {
    display: flex;
    gap: 0.5rem;
}

.keyword-input-container input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.keyword-input-container input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.keyword-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
    min-height: 2rem;
}

.keyword-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    animation: tagAppear 0.3s ease;
}

@keyframes tagAppear {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.keyword-tag button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    font-size: 1rem;
    line-height: 1;
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.keyword-tag button:hover {
    opacity: 1;
}

/* Style options */
.style-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

@media (min-width: 480px) {
    .style-options {
        grid-template-columns: repeat(3, 1fr);
    }
}

.style-option {
    cursor: pointer;
}

.style-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.style-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.style-option input:checked + .style-label {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
}

.style-option:hover .style-label {
    border-color: var(--primary-color);
}

.style-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.style-name {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Rhyme options */
.rhyme-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.rhyme-option {
    cursor: pointer;
}

.rhyme-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.rhyme-label {
    display: flex;
    flex-direction: column;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.rhyme-option input:checked + .rhyme-label {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
}

.rhyme-option:hover .rhyme-label {
    border-color: var(--primary-color);
}

.rhyme-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.rhyme-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Length slider */
.length-slider {
    padding: 0.5rem 0;
}

.length-slider input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.length-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
}

.length-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.length-slider input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

.length-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--card-background);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-large {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    border-radius: var(--radius-lg);
}

.btn-icon-only {
    padding: 0.5rem;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.btn-icon-only:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

.btn-icon {
    font-size: 1.2rem;
}

/* Poem output */
.poem-card {
    position: sticky;
    top: 1rem;
}

.poem-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.poem-header h2 {
    margin-bottom: 0;
}

.poem-actions {
    display: flex;
    gap: 0.25rem;
}

.poem-output {
    min-height: 200px;
    padding: 1.5rem;
    background: linear-gradient(135deg, #faf5ff 0%, #f0f9ff 100%);
    border-radius: var(--radius-lg);
    white-space: pre-wrap;
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.poem-output .placeholder-text {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: 2rem;
}

.poem-output .stanza {
    margin-bottom: 1.5rem;
}

.poem-output .stanza:last-child {
    margin-bottom: 0;
}

.poem-output .line {
    display: block;
}

.edit-section {
    margin-top: 1rem;
    text-align: center;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.poem-editor {
    flex: 1;
    min-height: 300px;
    padding: 1.5rem;
    border: none;
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 1.1rem;
    line-height: 1.8;
    resize: none;
    outline: none;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    color: white;
    margin-top: auto;
}

.footer p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.footer a {
    color: white;
    font-weight: 600;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.footer a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Toast notifications */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    to {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

/* Loading state */
.loading {
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Responsive adjustments */
@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.95rem;
    }

    .card {
        padding: 1.25rem;
    }

    .poem-output {
        font-size: 1rem;
        padding: 1rem;
    }

    .style-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Print styles */
@media print {
    body {
        background: white;
    }

    .input-section,
    .poem-header,
    .edit-section,
    .footer {
        display: none;
    }

    .poem-output {
        background: white;
        box-shadow: none;
    }
}