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

:root {
    --primary: #2193b0;
    --primary-light: #6dd5ed;
    --secondary: #2c3e50;
    --text-color: #333;
    --text-light: rgba(255, 255, 255, 0.92);
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --card-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --success-color: #4CAF50;
    --grade-o: #4caf50;
    --grade-a-plus: #8bc34a;
    --grade-a: #cddc39;
    --grade-b-plus: #ffc107;
    --grade-b: #ff9800;
    --grade-c: #ff5722;
    --grade-d: #f44336;
    --grade-f: #d32f2f;
}

body {
    min-height: 100vh;
    color: var(--text-color);
    background: var(--primary);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

/* Background effects */
.noise-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMDAiIGhlaWdodD0iMzAwIj48ZmlsdGVyIGlkPSJhIiB4PSIwIiB5PSIwIj48ZmVUdXJidWxlbmNlIGJhc2VGcmVxdWVuY3k9Ii43NSIgc3RpdGNoVGlsZXM9InN0aXRjaCIgdHlwZT0iZnJhY3RhbE5vaXNlIi8+PGZlQ29sb3JNYXRyaXggdHlwZT0ic2F0dXJhdGUiIHZhbHVlcz0iMCIvPjwvZmlsdGVyPjxwYXRoIGQ9Ik0wIDBoMzAwdjMwMEgweiIgZmlsdGVyPSJ1cmwoI2EpIiBvcGFjaXR5PSIuMDUiLz48L3N2Zz4=');
    opacity: 0.4;
    z-index: -2;
    pointer-events: none;
}

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%);
    z-index: -3;
    pointer-events: none;
}

/* Custom cursor */
.cursor,
.cursor-follower {
    position: fixed;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    z-index: 9999;
    pointer-events: none;
    transition: transform 0.1s;
}

.cursor {
    background: rgba(255, 255, 255, 0.3);
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
}

.cursor-follower {
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%) scale(2.5);
    transition: transform 0.3s, background 0.3s;
}

.cursor.active {
    transform: translate(-50%, -50%) scale(0.5);
}

.cursor-follower.active {
    transform: translate(-50%, -50%) scale(3.5);
    background: rgba(255, 255, 255, 0.15);
}

/* Modern Navbar */
.navbar {
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    box-shadow: var(--glass-shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
}

.navbar.responsive {
    height: auto;
    padding: 20px;
    flex-direction: column;
    align-items: flex-start;
}

.navbar.responsive .nav-logo {
    margin-bottom: 20px;
}

.navbar.responsive .nav-links {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-bottom: 20px;
}

.navbar.responsive .nav-links a {
    margin: 5px 0;
}

.nav-logo {
    height: 45px;
    width: 90px;
    background-image: url("mylogo.jpg");
    background-size: contain;
    background-repeat: no-repeat;
    transition: var(--transition);
}

.nav-logo:hover {
    transform: scale(1.05) translateY(-2px);
}

.nav-links a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: 8px;
    transition: var(--transition);
    margin: 0 10px;
    position: relative;
    overflow: hidden;
}

.nav-links a:hover,
.nav-links a.active {
    background: rgba(108, 213, 237, 0.1);
    transform: translateY(-2px);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transform: scaleX(0);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    transform: scaleX(1);
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--secondary);
    font-size: 24px;
    cursor: pointer;
}

.logout-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-size: 14px;
    box-shadow: 0 4px 15px rgba(33, 147, 176, 0.2);
    text-decoration: none;
}

.logout-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(33, 147, 176, 0.3);
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 10px;
}

.login-btn,
.register-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
}

.login-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 4px 15px rgba(33, 147, 176, 0.2);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(33, 147, 176, 0.3);
}

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

.register-btn:hover {
    background: rgba(33, 147, 176, 0.1);
    transform: translateY(-2px);
}

/* Calculator container */
.calculator-container {
    max-width: 800px;
    width: 90%;
    margin: 100px auto 40px;
    position: relative;
    flex: 1;
    animation: fadeIn 0.8s ease-out;
}

.calculator-header {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-light);
}

.calculator-header h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    font-weight: 700;
}

.calculator-header .tagline {
    font-size: 1.2rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
}

/* Calculator card */
.calculator-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-border);
    margin-bottom: 30px;
    animation: slideUp 0.6s ease-out 0.3s both;
    transition: transform 0.3s, box-shadow 0.3s;
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--secondary);
    font-weight: 500;
    font-size: 1.1rem;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 5px 15px rgba(33, 147, 176, 0.15);
    transform: translateY(-2px);
}

.calculate-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(33, 147, 176, 0.2);
}

.calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(33, 147, 176, 0.3);
}

.calculate-btn:active {
    transform: translateY(-1px);
}

.calculate-btn i {
    font-size: 1.2rem;
}

/* Result card */
.result-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-border);
    margin-bottom: 30px;
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}

.result-card.result-show {
    opacity: 1;
    transform: translateY(0);
}

.result-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.result-header i {
    font-size: 1.8rem;
}

.result-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.result-content {
    padding: 25px;
}

.result-content p {
    font-size: 1.2rem;
    color: var(--secondary);
    font-weight: 500;
    margin-bottom: 20px;
}

.result-metrics {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 20px;
}

.metric {
    flex: 1;
    background: rgba(255, 255, 255, 0.5);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.metric:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.gpa-metric {
    background: linear-gradient(135deg, rgba(33, 147, 176, 0.2), rgba(109, 213, 237, 0.2));
    border: 1px solid var(--primary-light);
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.gpa-metric .metric-value {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.metric-label {
    font-size: 0.9rem;
    color: var(--secondary);
    opacity: 0.8;
}

/* Grade guide */
.grade-guide {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--glass-border);
    margin-bottom: 30px;
    animation: fadeIn 0.8s ease-out 0.7s both;
}

.guide-header {
    background: rgba(44, 62, 80, 0.9);
    color: white;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.guide-header i {
    font-size: 1.5rem;
}

.guide-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0;
}

.guide-content {
    padding: 20px;
}

.guide-content ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.guide-content li {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: var(--transition);
}

.guide-content li:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.guide-content li:nth-child(1) {
    border-top: 3px solid var(--grade-o);
}

.guide-content li:nth-child(2) {
    border-top: 3px solid var(--grade-a-plus);
}

.guide-content li:nth-child(3) {
    border-top: 3px solid var(--grade-a);
}

.guide-content li:nth-child(4) {
    border-top: 3px solid var(--grade-b-plus);
}

.guide-content li:nth-child(5) {
    border-top: 3px solid var(--grade-b);
}

.guide-content li:nth-child(6) {
    border-top: 3px solid var(--grade-c);
}

.guide-content li:nth-child(7) {
    border-top: 3px solid var(--grade-d);
}

.guide-content li:nth-child(8) {
    border-top: 3px solid var(--grade-f);
}

.grade {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.guide-content li:nth-child(1) .grade {
    color: var(--grade-o);
}

.guide-content li:nth-child(2) .grade {
    color: var(--grade-a-plus);
}

.guide-content li:nth-child(3) .grade {
    color: var(--grade-a);
}

.guide-content li:nth-child(4) .grade {
    color: var(--grade-b-plus);
}

.guide-content li:nth-child(5) .grade {
    color: var(--grade-b);
}

.guide-content li:nth-child(6) .grade {
    color: var(--grade-c);
}

.guide-content li:nth-child(7) .grade {
    color: var(--grade-d);
}

.guide-content li:nth-child(8) .grade {
    color: var(--grade-f);
}

.points {
    font-size: 0.9rem;
    color: var(--secondary);
    opacity: 0.8;
}

/* Modern Footer */
.footer {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--secondary);
    padding: 15px 0;
    /* Compact Padding */
    text-align: center;
    border-top: 1px solid var(--glass-border);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-social {
    margin-bottom: 20px;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    /* Compact Size */
    height: 36px;
    /* Compact Size */
    border-radius: 50%;
    color: var(--secondary);
    background: rgba(255, 255, 255, 0.2);
    margin: 0 8px;
    /* Tighter Margin */
    text-decoration: none;
    font-size: 16px;
    /* Smaller Icon */
    transition: all 0.3s;
}

.social-icon:hover {
    transform: translateY(-5px);
    background: white;
    color: var(--primary);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.footer-bottom p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

/* Responsive Design */
@media (max-width: 1200px) {
    .calculator-container {
        width: calc(100% - 40px);
    }
}

@media (max-width: 992px) {
    .calculator-header h1 {
        font-size: 2.4rem;
    }

    .calculator-header .tagline {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 20px;
    }

    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .calculator-container {
        margin: 80px auto 30px;
    }

    .calculator-header h1 {
        font-size: 2rem;
    }

    .calculator-header .tagline {
        font-size: 1rem;
    }

    .calculator-card,
    .result-card,
    .grade-guide {
        padding: 20px;
    }

    .result-metrics {
        flex-direction: column;
        gap: 15px;
    }

    .guide-content ul {
        grid-template-columns: repeat(2, 1fr);
    }

    .social-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
        margin: 0 8px;
    }
}

@media (max-width: 480px) {
    .navbar {
        height: 60px;
        padding: 0 15px;
    }

    .calculator-container {
        margin: 70px auto 20px;
        width: calc(100% - 30px);
    }

    .calculator-header h1 {
        font-size: 1.8rem;
    }

    .calculator-header .tagline {
        font-size: 0.9rem;
    }

    .form-group label {
        font-size: 1rem;
    }

    .form-group input {
        padding: 12px 15px;
    }

    .calculate-btn {
        padding: 12px 20px;
    }

    .result-header {
        padding: 15px;
    }

    .result-header i {
        font-size: 1.5rem;
    }

    .result-header h2 {
        font-size: 1.3rem;
    }

    .result-content {
        padding: 20px;
    }

    .result-content p {
        font-size: 1.1rem;
    }

    .metric-value {
        font-size: 1.8rem;
    }

    .gpa-metric .metric-value {
        font-size: 2.2rem;
    }

    .guide-content ul {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .grade {
        font-size: 1.3rem;
    }
}

/* Authentication Toast Notification */
.auth-toast {
    position: fixed;
    top: 80px;
    right: 20px;
    max-width: 350px;
    width: 90%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(120%);
    opacity: 0;
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.auth-toast.show {
    transform: translateX(0);
    opacity: 1;
}

.auth-toast-content {
    display: flex;
    align-items: flex-start;
    padding: 16px;
    gap: 12px;
    position: relative;
}

.auth-toast-content i {
    color: var(--primary);
    font-size: 24px;
    margin-top: 2px;
}

.auth-toast-message {
    flex: 1;
}

.auth-toast-message h4 {
    margin: 0 0 5px;
    color: var(--secondary);
    font-size: 16px;
}

.auth-toast-message p {
    margin: 0;
    color: #666;
    font-size: 14px;
}

.auth-toast-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-left: auto;
}

.toast-login-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.toast-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(33, 147, 176, 0.2);
}

.toast-dismiss-btn {
    background: transparent;
    border: none;
    color: #888;
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
    align-self: flex-end;
    transition: all 0.2s ease;
}

.toast-dismiss-btn:hover {
    color: #555;
    transform: rotate(90deg);
}

@media (max-width: 480px) {
    .auth-toast {
        top: 70px;
        right: 10px;
        width: calc(100% - 20px);
        max-width: unset;
    }
}