/* Rapify V4 - Modern CSS Styles */

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: #1e1e3f;
    
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-color: #374151;
    --border-light: #4b5563;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo .version {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
}

.nav-tab {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.nav-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Generator Styles */
.generator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    min-height: 600px;
}

.input-section, .output-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.input-section h2, .output-section h3 {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

/* Button Styles */
.btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    text-decoration: none;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

/* Output Section */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.format-toggles {
    display: flex;
    gap: 0.5rem;
}

.format-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.format-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.format-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.lyrics-display {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    min-height: 400px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    white-space: pre-wrap;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.placeholder .sub-text {
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

.output-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.metadata-section {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
}

.metadata-section h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* AI Coach Styles */
.coach-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    min-height: 600px;
}

.coach-input, .coach-output {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.coach-input h2 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.coach-input p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.feedback-display {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    min-height: 400px;
    overflow-y: auto;
}

/* History Styles */
.history-container {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.history-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.history-filters input,
.history-filters select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    color: var(--text-primary);
    flex: 1;
}

.history-list {
    min-height: 400px;
}

.history-item {
    /* Light theme: white card; Dark theme: keep existing tertiary tone */
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.25rem 1rem 1.25rem;
    margin-bottom: 0.75rem;
    transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

html.dark .history-item {
    background: var(--bg-tertiary);
}

.history-item:hover {
    background: #f9fafb;
    border-color: var(--border-light);
    transform: translateY(-1px);
}

html.dark .history-item:hover {
    background: #1d2744;
}

/* Knowledge Styles */
.knowledge-container {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.knowledge-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.knowledge-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all 0.2s ease;
}

.knowledge-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.knowledge-card h3 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
}

.knowledge-content ul {
    list-style: none;
    padding: 0;
}

.knowledge-content li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.knowledge-content li:last-child {
    border-bottom: none;
}

.essential {
    margin-bottom: 1.5rem;
}

.essential h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 35, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    -webkit-backdrop-filter: blur(5px);
    backdrop-filter: blur(5px);
}

.loading-overlay.active {
    display: flex;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    animation: slideIn 0.3s ease forwards;
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

@keyframes slideIn {
    to {
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-tabs {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .generator-container,
    .coach-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .action-buttons,
    .output-actions {
        flex-direction: column;
    }
    
    .history-filters {
        flex-direction: column;
    }
    
    .knowledge-sections {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem 0.5rem;
    }
    
    .input-section,
    .output-section,
    .coach-input,
    .coach-output,
    .history-container,
    .knowledge-container {
        padding: 1rem;
    }
    
    .nav-tab {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* Selection Styling */
::selection {
    background: var(--primary-color);
    color: white;
}

/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* =========================================================
   Coach Fullscreen Styles
   When the .coach-fullscreen class is applied to the html
   element, hide other panels and expand the coach panel to
   fill the viewport. These rules mirror the behaviour in
   previous versions where full-screen was supported.
========================================================= */
.coach-fullscreen nav,
.coach-fullscreen #header,
.coach-fullscreen #features,
.coach-fullscreen #generator,
.coach-fullscreen footer {
    display: none !important;
}

.coach-fullscreen #coach {
    padding-top: 0 !important;
}

.coach-fullscreen #coachPanel {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    z-index: 10000;
    background: var(--bg-secondary);
    padding: 2rem;
}

.coach-fullscreen #coachPanel .grid {
    grid-template-columns: 1fr !important;
}

.coach-fullscreen #coachPanel .space-y-4:last-child {
    /* Hide the coaching preferences when in full screen */
    display: none !important;
}

/* Expand the message container to utilize vertical space in fullscreen mode */
.coach-fullscreen #coachMessages {
    /* Override fixed height so the message area grows to fill available space */
    height: calc(100vh - 14rem) !important;
}

/* Hide the exit fullscreen button by default */
#exitCoachFullscreen {
    display: none;
}

/* Show exit fullscreen button when in fullscreen mode */
.coach-fullscreen #exitCoachFullscreen {
    display: block !important;
}

/* Toggle icon visibility for fullscreen button */
.full-screen-toggle-icon i.fa-compress {
    display: none;
}

.full-screen-toggle-icon i.fa-expand {
    display: inline-block;
}