@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #006159;
    --primary-dark: #8481b4;
    --secondary: #4aac93;
    --bg-gradient: linear-gradient(135deg, #e0e7ff 0%, #fae8ff 100%);
    --glass-bg: rgba(247, 250, 249, 0.85);
    --glass-border: rgba(255, 255, 255, 0.5);
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    padding: 40px 20px;
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06),
        0 0 0 1px var(--glass-border);
    padding: 48px;
    transition: transform 0.3s ease;
}

h1 {
    text-align: center;
    color: var(--text-main);
    margin-bottom: 12px;
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #d3c4b3, #3b1d2b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 48px;
    font-size: 1.125rem;
    font-weight: 400;
}

.student-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.6);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-main);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: #fff;
    color: var(--text-main);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.semester-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.semester-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

button {
    cursor: pointer;
    border: none;
    font-weight: 600;
    transition: all 0.2s ease;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.add-semester-btn {
    background: rgb(255, 193, 193);
    color: var(--primary);
    border: 1px solid #e5e7eb;
    padding: 10px 20px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.add-semester-btn:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.semester-block {
    margin-bottom: 32px;
    padding: 24px;
    background: #fff;
    border-radius: 16px;
    border: 1px solid #f3f4f6;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
    animation: slideIn 0.4s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.semester-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid #f3f4f6;
}

.remove-semester-btn {
    background: #fee2e2;
    color: #b91c1c;
    padding: 6px 14px;
    font-size: 0.875rem;
}

.remove-semester-btn:hover {
    background: #fecaca;
}

.course-header {
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.add-course-btn {
    background: #eff6ff;
    color: #1d4ed8;
    padding: 6px 14px;
    font-size: 0.875rem;
}

.add-course-btn:hover {
    background: #dbeafe;
}

.courses-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.course-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 16px;
    align-items: center;
    padding: 12px;
    background: #f9fafb;
    border-radius: 12px;
    transition: background 0.2s;
}

.course-item:hover {
    background: #f3f4f6;
}

.course-item .input-group {
    margin-bottom: 0;
}

.course-item label {
    display: none;
    /* Hide labels inside the grid for cleaner look */
}

.remove-btn {
    background: white;
    color: var(--text-muted);
    border: 1px solid #e5e7eb;
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: 8px;
}

.remove-btn:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.semester-gpa {
    text-align: right;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px dashed #e5e7eb;
    font-weight: 500;
}

.semester-gpa-value {
    font-weight: 800;
    color: var(--primary);
    font-size: 1.25rem;
    margin-left: 8px;
}

.actions-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
    margin-top: 40px;
}

.main-btn {
    padding: 16px;
    border-radius: 12px;
    font-size: 1rem;
    width: 100%;
}

.calculate-btn {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

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

.export-btn {
    background: #fff;
    color: var(--text-main);
    border: 1px solid #e5e7eb;
}

.export-btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
}

.clear-btn {
    background: transparent;
    color: var(--text-muted);
}

.clear-btn:hover {
    color: var(--danger);
    background: #fee2e2;
}

.result-section {
    margin-top: 48px;
    background: linear-gradient(135deg, #4f46e5, #ec4899);
    border-radius: 20px;
    padding: 40px;
    color: white;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
    display: none;
}

.result-section.show {
    opacity: 1;
    transform: translateY(0);
    display: block;
}

.result-header h3 {
    font-size: 1.5rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.gpa-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.gpa-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.gpa-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.8;
    margin-bottom: 8px;
}

.gpa-display {
    font-size: 3rem;
    font-weight: 800;
}

.gpa-max {
    font-size: 1rem;
    opacity: 0.6;
}

.status-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    font-weight: 600;
    margin-bottom: 16px;
}

.grading-legend {
    margin-top: 48px;
    background: white;
    padding: 24px;
    border-radius: 16px;
    border: 1px solid #e5e7eb;
}

.grading-legend h4 {
    margin-bottom: 16px;
    font-size: 1rem;
    color: var(--text-main);
}

.legend-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
}

.legend-item {
    font-size: 0.875rem;
    padding: 8px;
    background: #f9fafb;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #f3f4f6;
}

.legend-item strong {
    color: var(--primary);
    display: block;
}

@media (max-width: 640px) {

    .student-info,
    .actions-container,
    .gpa-grid,
    .course-item {
        grid-template-columns: 1fr;
    }

    .course-item {
        gap: 12px;
        padding: 16px;
        position: relative;
    }

    .remove-btn {
        position: absolute;
        top: 8px;
        right: 8px;
        width: 32px;
        height: 32px;
    }

    .container {
        padding: 20px;
    }
}