/* ===================================
   AIUB Academic Management Tool
   Modern Dark Theme Stylesheet
   =================================== */

:root {
    /* AIUB Academic Dark (Brand-Aligned) */
    --primary-color: #004ea2;      /* AIUB Deep Blue */
    --primary-dark: #00387a;
    --accent-color: #9ca3af;       /* muted silver */
    --success-color: #16a34a;
    --warning-color: #f59e0b;
    --danger-color: #dc2626;

    /* Background Colors */
    --bg-primary: #0f172a;         /* slate */
    --bg-secondary: #111827;
    --bg-card: #0b1220;
    --bg-input: #0a1020;

    /* Text Colors */
    --text-primary: #e5e7eb;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    /* Border & Shadow */
    --border-color: #1f2a44;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 14px 42px rgba(0, 0, 0, 0.45);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

/* ===================================
   Global Styles & Reset
   =================================== */

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

body {
    font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background:
        radial-gradient(1200px circle at 50% 0%, rgba(0, 78, 162, 0.16) 0%, rgba(0, 78, 162, 0) 55%),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-sm);
}

/* ===================================
   Header Section
   =================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    background:
        linear-gradient(180deg, rgba(0, 78, 162, 0.16) 0%, rgba(0, 78, 162, 0) 55%),
        var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(0, 78, 162, 0.35);
    border-top: 3px solid var(--primary-color);
}

.header-content {
    padding: var(--spacing-md);
}

.title {
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: center;
    align-items: center;
}

.university-logo {
    height: 96px;
    width: auto;
    max-width: 100%;
    display: block;
    object-fit: contain;
    filter: drop-shadow(0 6px 16px rgba(0, 0, 0, 0.35));
}

.university {
    font-weight: 900;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 700;
}

.disclaimer {
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    font-size: 0.85rem;
    line-height: 1.4;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    max-width: 70ch;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================
   Card Styles
   =================================== */

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 78, 162, 0.55);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ===================================
   Form Elements
   =================================== */

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.2px;
}

.form-group input,
.form-group select {
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-card);
    box-shadow: 0 0 0 3px rgba(0, 78, 162, 0.22);
}

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

.form-group small {
    margin-top: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.8rem;
    display: block;
}

/* ===================================
   Course Row Styles
   =================================== */

.courses-container {
    margin-bottom: var(--spacing-md);
}

.course-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    position: relative;
    transition: all 0.3s ease;
}

.course-row:hover {
    background: var(--bg-input);
    border-color: var(--primary-color);
}

.course-fields {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-md);
    flex: 1;
}

.grade-display {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.grade-result {
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent-color);
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--danger-color);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove:hover {
    background: #dc2626;
    transform: rotate(90deg);
}

/* ===================================
   Buttons
   =================================== */

.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.2px;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    justify-content: center;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.35);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 100%;
    margin-bottom: var(--spacing-md);
}

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

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

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

.btn-icon {
    font-size: 1.2rem;
    font-weight: 700;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* ===================================
   Results Section
   =================================== */

.results-container {
    margin-top: var(--spacing-lg);
    animation: slideIn 0.5s ease;
}

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

.result-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 2px solid var(--primary-color);
}

.result-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.result-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    text-align: center;
}

.result-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-value.highlight {
    color: var(--primary-color);
    font-size: 2.2rem;
}

.result-value.status {
    font-size: 1.2rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    background: var(--success-color);
    color: white;
}

/* Status Colors */
.status-probation {
    background: var(--danger-color) !important;
}

.status-warning {
    background: var(--warning-color) !important;
}

.status-good {
    background: var(--success-color) !important;
}

.status-excellent {
    background: var(--secondary-color) !important;
}

/* ===================================
   Final Exam Results
   =================================== */

.final-exam-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
}

.final-exam-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 1rem;
}

.detail-row span:first-child {
    color: var(--text-secondary);
    font-weight: 600;
}

.detail-row span:last-child {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.2rem;
}

.highlight-row {
    background: var(--bg-primary);
    border: 2px solid var(--primary-color);
}

.highlight-row span:last-child {
    color: var(--primary-color);
}

.large-text {
    font-size: 1.8rem !important;
}

.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
}

.status-achievable {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.status-not-achievable {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
}

.status-excellent-performance {
    background: rgba(124, 58, 237, 0.2);
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

/* ===================================
   Grading Scale Section
   =================================== */

.grading-scale {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
}

.scale-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.scale-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.scale-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.scale-item.fail {
    border-color: var(--danger-color);
}

.scale-item .grade {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.scale-item.fail .grade {
    color: var(--danger-color);
}

.scale-item .marks {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.scale-item .points {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
}

/* ===================================
   Info Text
   =================================== */

.info-text {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* ===================================
   Footer
   =================================== */

.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

/* ===================================
   Responsive Design - Mobile First
   =================================== */

/* Base styles are mobile-first (already defined above) */

/* Small Phones: 320px - 480px */
@media (max-width: 480px) {
    :root {
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.25rem;
        --spacing-xl: 2rem;
    }

    body {
        font-size: 14px;
    }
    
    .container {
        padding: var(--spacing-xs);
    }
    
    .header {
        padding: var(--spacing-md) var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
    }

    .university-logo {
        height: 64px;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }

    .disclaimer {
        font-size: 0.75rem;
        max-width: 100%;
        padding: var(--spacing-xs);
    }
    
    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .card-title {
        font-size: 1.25rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .form-group input {
        padding: 0.625rem 0.875rem;
        font-size: 0.95rem;
    }

    .form-group label {
        font-size: 0.85rem;
    }

    .form-group small {
        font-size: 0.75rem;
    }
    
    .course-fields {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .course-row {
        flex-direction: column;
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .btn-remove {
        position: relative;
        top: 0;
        right: 0;
        width: 100%;
        height: 40px;
        border-radius: var(--radius-sm);
        margin-top: var(--spacing-sm);
        font-size: 1.2rem;
    }

    .btn-remove:hover {
        transform: none;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
    }

    .btn:hover {
        transform: none;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .result-value {
        font-size: 1.5rem;
    }

    .result-value.highlight {
        font-size: 1.8rem;
    }

    .result-value.status {
        font-size: 1rem;
    }
    
    .scale-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }

    .scale-item {
        padding: var(--spacing-sm);
    }

    .scale-item .grade {
        font-size: 1.25rem;
    }

    .scale-item .marks {
        font-size: 0.8rem;
    }

    .scale-item .points {
        font-size: 0.95rem;
    }

    .footer {
        padding: var(--spacing-md) 0;
        font-size: 0.8rem;
    }
}

/* Phones: 481px - 767px */
@media (min-width: 481px) and (max-width: 767px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .university-logo {
        height: 72px;
    }
    
    .subtitle {
        font-size: 0.95rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .course-fields {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }

    .course-fields .form-group:first-child {
        grid-column: 1 / -1;
    }

    .grade-display {
        grid-column: 1 / -1;
    }
    
    .course-row {
        flex-direction: column;
    }
    
    .btn-remove {
        position: relative;
        top: 0;
        right: 0;
        width: 100%;
        border-radius: var(--radius-sm);
        margin-top: var(--spacing-sm);
    }
    
    .action-buttons {
        flex-direction: row;
        gap: var(--spacing-sm);
    }
    
    .btn {
        flex: 1;
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scale-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Tablets: 768px - 1024px */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        max-width: 960px;
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .university-logo {
        height: 80px;
    }

    .subtitle {
        font-size: 1rem;
    }

    .form-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .form-grid .form-group:nth-child(3) {
        grid-column: 1 / -1;
    }
    
    .course-fields {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: var(--spacing-md);
    }

    .course-row {
        padding: var(--spacing-md);
    }

    .btn-remove {
        position: absolute;
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 32px;
        height: 32px;
        border-radius: 50%;
    }
    
    .action-buttons {
        flex-direction: row;
    }

    .btn {
        flex: 1;
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scale-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Laptops & Small Desktops: 1025px - 1440px */
@media (min-width: 1025px) and (max-width: 1440px) {
    .container {
        max-width: 1200px;
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .university-logo {
        height: 96px;
    }

    .form-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .course-fields {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }

    .results-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .scale-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* Large Desktops & MacBooks Pro: 1441px+ */
@media (min-width: 1441px) {
    .container {
        max-width: 1400px;
    }

    .header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .university-logo {
        height: 110px;
    }

    .card {
        padding: var(--spacing-xl);
    }

    .form-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }

    .course-fields {
        grid-template-columns: 2.5fr 1fr 1fr 1fr;
    }

    .results-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
    }

    .scale-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: var(--spacing-md);
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .btn-remove,
    input,
    select {
        min-height: 44px; /* iOS minimum touch target */
    }

    .btn {
        padding: 1rem 1.5rem;
    }

    .form-group input,
    .form-group select {
        padding: 0.875rem 1rem;
        font-size: 16px; /* Prevent zoom on iOS */
    }

    /* Disable hover effects on touch devices */
    .card:hover,
    .btn:hover,
    .scale-item:hover {
        transform: none;
    }
}

/* High DPI / Retina Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .university-logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Landscape Orientation on Mobile */
@media (max-width: 896px) and (orientation: landscape) {
    .header {
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .university-logo {
        height: 48px;
    }

    .card {
        padding: var(--spacing-sm);
    }

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

    .course-fields .form-group:first-child {
        grid-column: 1 / -1;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .container {
        max-width: 100%;
    }

    .btn,
    .btn-remove,
    .action-buttons {
        display: none;
    }

    .card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }

    .header {
        border-bottom: 2px solid #004ea2;
    }
}

/* ===================================
   Animations & Effects
   =================================== */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Safari & iOS Specific Fixes */
input[type="number"] {
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Smooth scrolling for all browsers */
html {
    scroll-behavior: smooth;
}

/* Prevent text selection on buttons */
.btn,
.btn-remove {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Better focus visibility for accessibility */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}