/* Animation Classes */
.animate-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s forwards;
}

.delay-1 {
    animation-delay: 0.2s;
}

.delay-2 {
    animation-delay: 0.4s;
}

.delay-3 {
    animation-delay: 0.6s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll Animations */
.animate-in-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Course and Semester Row Animations */
.course-row, .semester-row {
    animation: slideIn 0.3s ease forwards;
}

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

/* Button Interactions */
.btn {
    transition: all 0.3s ease;
}

.btn:active {
    transform: scale(0.96);
}

/* Form Control Animations */
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 89, 152, 0.25);
    transition: all 0.3s ease;
}

/* Tab Transitions */
.tab-btn, .program-tab {
    position: relative;
    overflow: hidden;
}

.tab-btn::after, .program-tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.tab-btn.active::after, .program-tab.active::after {
    width: 100%;
}

/* Tab Content Transitions */
.tab-pane, .program-pane {
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: opacity 0.3s ease;
}

.tab-pane.active, .program-pane.active {
    opacity: 1;
    height: auto;
    overflow: visible;
}

/* Result Section Animation */
.result-section {
    transform: scaleY(0);
    transform-origin: top;
    opacity: 0;
    transition: transform 0.5s ease, opacity 0.5s ease;
}

.result-section.visible {
    transform: scaleY(1);
    opacity: 1;
}

/* GPA Display Animation */
.gpa-display {
    position: relative;
}

.gpa-display span {
    display: inline-block;
    transition: transform 0.5s ease, color 0.5s ease;
}

.gpa-display.updating span {
    transform: scale(1.2);
    color: var(--primary-color);
}

/* Table Row Hover */
.calculator-table tbody tr {
    transition: background-color 0.3s ease;
}

.calculator-table tbody tr:hover {
    background-color: rgba(59, 89, 152, 0.05);
}

/* Delete Button Animation */
.btn-delete {
    transition: all 0.3s ease;
    opacity: 0.7;
}

.btn-delete:hover {
    color: var(--error-color);
    opacity: 1;
    transform: scale(1.1);
}

/* University Card Animation */
.university-card {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.university-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    z-index: -1;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.university-card:hover::before {
    transform: scaleX(1);
}

/* Loading Animation */
.loading {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
}

.loading div {
    position: absolute;
    border: 4px solid var(--primary-color);
    opacity: 1;
    border-radius: 50%;
    animation: loading 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

.loading div:nth-child(2) {
    animation-delay: -0.5s;
}

@keyframes loading {
    0% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        top: 0px;
        left: 0px;
        width: 72px;
        height: 72px;
        opacity: 0;
    }
}