/*
 * ConceptCheck - Open Source Educational Assessment Tool
 * Less Policing. More Teaching. Proof of Thought, Not Just Proof of Work.
 * 
 * Copyright (c) 2025 ConceptCheck
 * Licensed under the MIT License - see LICENSE file for details
 */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: #b0b0b0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo .logo-placeholder {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
}

.logo {
    font-family: 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: -0.5px;
    color: #ffffff;
    margin: 0;
}

.logo .highlight {
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #b0b0b0;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    transition: width 0.3s ease;
}

.nav-link.active::after,
.nav-link:hover::after {
    width: 100%;
}

.nav-mobile-toggle {
    display: none;
    cursor: pointer;
    color: #ffffff;
}

.nav-mobile {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    z-index: 999;
    padding: 6rem 2rem 2rem;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    display: none;
}

.nav-mobile.active {
    transform: translateY(0);
}

.nav-mobile-link {
    display: block;
    color: #b0b0b0;
    text-decoration: none;
    font-weight: 500;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: color 0.3s ease;
}

.nav-mobile-link:hover {
    color: #ffffff;
}

/* Main Content */
.main {
    margin-top: 5rem;
}

.section {
    display: none;
    min-height: calc(100vh - 5rem);
    padding: 2rem 0;
}

.section.active {
    display: block;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, #ffffff, #b0b0b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: calc(100vh - 10rem);
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    z-index: 2;
}

.hero-title {
    font-size: 4rem;
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: 2rem;
}

.hero-title-main {
    display: block;
    color: #ffffff;
}

.hero-title-accent {
    display: block;
    background: linear-gradient(135deg, #6366f1, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #b0b0b0;
    max-width: 500px;
    line-height: 1.6;
}

.hero-visual {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 2rem;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
}

.hero-card h3 {
    font-size: 1.25rem;
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.hero-card p {
    color: #b0b0b0;
    font-size: 0.9rem;
}

/* Tool Link Styling */
.tool-link {
    color: #6366f1;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
}

.tool-link:hover {
    color: #8b5cf6;
    border-bottom-color: #8b5cf6;
    transform: translateY(-1px);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 1.5rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature .material-icons {
    color: #6366f1;
    font-size: 2rem;
    margin-top: 0.25rem;
}

.feature h3 {
    color: #ffffff;
    margin-bottom: 0.25rem;
}

.feature p {
    color: #b0b0b0;
    font-size: 0.9rem;
}

/* Form Styles */
.test-form-container {
    max-width: 700px;
    margin: 0 auto;
}

/* Question Results */
.question-results {
    margin-top: 3rem;
    background: rgba(34, 197, 94, 0.05);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 1rem;
    padding: 2rem;
    animation: fadeIn 0.5s ease-in;
}

.results-header {
    margin-bottom: 2rem;
    text-align: center;
}

.results-header h3 {
    color: #22c55e;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.results-metadata {
    color: #b0b0b0;
    font-size: 0.9rem;
    line-height: 1.4;
}

.results-metadata p {
    margin-bottom: 0.5rem;
}

.questions-content {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.75rem;
    padding: 2rem;
    margin-bottom: 2rem;
}

.questions-text {
    color: #e0e0e0;
    line-height: 1.6;
    font-size: 1rem;
}

.question-type {
    background: rgba(99, 102, 241, 0.2);
    color: #a855f7;
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.question-type-heading {
    color: #a855f7;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
    border-bottom: 2px solid rgba(168, 85, 247, 0.3);
    padding-bottom: 0.75rem;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Assessment Tabs */
.assessment-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tab-button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: transparent;
    color: #b0b0b0;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
}

.tab-button:hover {
    color: #e0e0e0;
    background: rgba(255, 255, 255, 0.03);
}

.tab-button.active {
    color: #a855f7;
    border-bottom-color: #a855f7;
    background: rgba(168, 85, 247, 0.1);
}

.tab-button .material-icons {
    font-size: 1.2rem;
}

.tab-content {
    position: relative;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

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

.form-intro {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: rgba(99, 102, 241, 0.05);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 1rem;
}

.form-intro p {
    font-size: 1.1rem;
    color: #e0e0e0;
    margin: 0;
    line-height: 1.6;
}

.test-form {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 3rem;
    backdrop-filter: blur(10px);
}

.form-group {
    margin-bottom: 2rem;
}

.form-group.primary-upload {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: rgba(99, 102, 241, 0.03);
    border: 1px solid rgba(99, 102, 241, 0.1);
    border-radius: 0.75rem;
}

.form-label {
    display: block;
    color: #ffffff;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.form-label .required {
    color: #ef4444;
    font-weight: 700;
}

.form-label .optional {
    color: #888;
    font-weight: 400;
    font-size: 0.9rem;
}

.form-description {
    margin-bottom: 1rem;
}

.form-description p {
    color: #b0b0b0;
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.5;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.5rem;
    color: #ffffff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-select option {
    background: #ffffff;
    color: #000000;
    padding: 0.5rem;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: #666;
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* File Upload */
.file-upload-area {
    border: 2px dashed rgba(99, 102, 241, 0.4);
    border-radius: 0.75rem;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(99, 102, 241, 0.03);
}

.file-upload-area:hover {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.08);
    transform: translateY(-2px);
}

.file-upload-area.drag-over {
    border-color: #8b5cf6;
    background: rgba(139, 92, 246, 0.1);
    transform: scale(1.02);
}

.file-upload-icon {
    font-size: 3.5rem !important;
    color: #6366f1;
    margin-bottom: 1rem;
    display: block;
}

.file-upload-text {
    color: #ffffff;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.file-upload-link {
    color: #8b5cf6;
    text-decoration: underline;
    cursor: pointer;
    font-weight: 600;
}

.file-upload-link:hover {
    color: #a855f7;
}

.file-upload-subtext {
    color: #b0b0b0;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.file-upload-limit {
    color: #888;
    font-size: 0.85rem;
    font-style: italic;
}

.file-list {
    margin-top: 1rem;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

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

.file-info .material-icons {
    color: #6366f1;
}

.file-name {
    color: #ffffff;
    font-weight: 500;
}

.file-size {
    color: #888;
    font-size: 0.85rem;
}

.file-remove {
    background: none;
    border: none;
    color: #ff4757;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
}

.file-remove:hover {
    background: rgba(255, 71, 87, 0.1);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #ffffff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #b0b0b0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #ffffff;
    margin-bottom: 1rem;
}

.footer-section p {
    color: #b0b0b0;
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    color: #b0b0b0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: #6366f1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #666;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-mobile-toggle {
        display: block;
    }
    
    .nav-mobile {
        display: block;
    }
    
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        padding: 2rem 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .test-form {
        padding: 2rem 1rem;
        margin: 0 1rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .file-upload-area {
        padding: 2rem 1rem;
    }
    
    .file-upload-icon {
        font-size: 2rem !important;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
}

/* Loading and Animation States */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Success/Error Messages */
.message {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    animation: slideIn 0.3s ease;
}

.message.success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}