/* Grade Calculator Pro - Modern CSS with Glassmorphism */

:root {
    /* Primary Colors - Clean Teal/Turquoise (User-Friendly) */
    --gc-primary: #14b8a6;
    --gc-primary-dark: #0d9488;
    --gc-secondary: #2dd4bf;
    --gc-accent: #06b6d4;

    /* Light Mode Colors */
    --gc-bg-light: #f8fafc;
    --gc-card-bg-light: rgba(255, 255, 255, 0.95);
    --gc-text-primary-light: #1e293b;
    --gc-text-secondary-light: #64748b;
    --gc-border-light: rgba(148, 163, 184, 0.2);

    /* Dark Mode Colors */
    --gc-bg-dark: #0f172a;
    --gc-card-bg-dark: rgba(30, 41, 59, 0.95);
    --gc-text-primary-dark: #f1f5f9;
    --gc-text-secondary-dark: #94a3b8;
    --gc-border-dark: rgba(71, 85, 105, 0.3);

    /* Spacing */
    --gc-spacing-xs: 0.5rem;
    --gc-spacing-sm: 0.75rem;
    --gc-spacing-md: 1rem;
    --gc-spacing-lg: 1.5rem;
    --gc-spacing-xl: 2rem;

    /* Border Radius */
    --gc-radius-sm: 0.5rem;
    --gc-radius-md: 0.75rem;
    --gc-radius-lg: 1rem;
    --gc-radius-xl: 1.5rem;

    /* Shadows */
    --gc-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --gc-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --gc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --gc-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --gc-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gc-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);

    /* Touch Targets - minimum 44px for mobile accessibility */
    --gc-touch-target: 44px;
}

/* Auto detect dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --gc-bg: var(--gc-bg-dark);
        --gc-card-bg: var(--gc-card-bg-dark);
        --gc-text-primary: var(--gc-text-primary-dark);
        --gc-text-secondary: var(--gc-text-secondary-dark);
        --gc-border: var(--gc-border-dark);
    }
}

@media (prefers-color-scheme: light) {
    :root {
        --gc-bg: var(--gc-bg-light);
        --gc-card-bg: var(--gc-card-bg-light);
        --gc-text-primary: var(--gc-text-primary-light);
        --gc-text-secondary: var(--gc-text-secondary-light);
        --gc-border: var(--gc-border-light);
    }
}

/* Container */
.gc-pro-container,
.gc-pro-container * {
    box-sizing: border-box;
}

.gc-pro-container {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--gc-spacing-lg);
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Animated gradient background */
.gc-pro-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg,
            var(--gc-primary) 0%,
            var(--gc-secondary) 25%,
            var(--gc-accent) 50%,
            var(--gc-secondary) 75%,
            var(--gc-primary) 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    opacity: 0.1;
    border-radius: var(--gc-radius-xl);
    z-index: -1;
    filter: blur(60px);
}

@keyframes gradientShift {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

/* Card with Glassmorphism */
.gc-pro-card {
    background: var(--gc-card-bg);
    backdrop-filter: blur(10px) saturate(150%);
    -webkit-backdrop-filter: blur(10px) saturate(150%);
    border-radius: var(--gc-radius-xl);
    border: 1px solid var(--gc-border);
    box-shadow: var(--gc-shadow-xl);
    padding: var(--gc-spacing-xl);
    position: relative;
    overflow: hidden;
    transition: var(--gc-transition);
    contain: layout style;
    will-change: transform;
}

.gc-pro-card:hover {
    -webkit-transform: translateY(-2px);
    -ms-transform: translateY(-2px);
    transform: translateY(-2px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* Header */
.gc-pro-header {
    text-align: center;
    margin-bottom: var(--gc-spacing-xl);
    position: relative;
}

.gc-pro-title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gc-primary), var(--gc-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0 0 var(--gc-spacing-sm) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--gc-spacing-sm);
}

.gc-pro-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.gc-pro-subtitle {
    color: var(--gc-text-secondary);
    font-size: 1rem;
    margin: 0;
    font-weight: 400;
}

/* Calculator Body */
.gc-pro-calculator-body {
    display: flex;
    flex-direction: column;
    gap: var(--gc-spacing-lg);
}

/* Input Groups */
.gc-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--gc-spacing-xs);
}

.gc-input-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gc-text-primary);
    margin-bottom: 0.25rem;
}

.gc-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    /* Use 16px to prevent iOS zoom on focus */
    border: 2px solid var(--gc-border);
    border-radius: var(--gc-radius-md);
    background: rgba(30, 41, 59, 0.5) !important;
    background-color: rgba(30, 41, 59, 0.5) !important;
    color: #f1f5f9 !important;
    transition: var(--gc-transition-fast);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    contain: layout style;
    -webkit-text-fill-color: #f1f5f9 !important;
    caret-color: #f1f5f9;
    -webkit-appearance: none;
    -moz-appearance: textfield;
    appearance: none;
    /* Mobile touch improvements */
    min-height: var(--gc-touch-target);
    touch-action: manipulation;
    /* Prevent text size adjustment on orientation change */
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* Specific styling for number inputs to override browser defaults */
input[type="number"].gc-input,
input[type="text"].gc-input {
    background: rgba(30, 41, 59, 0.5) !important;
    background-color: rgba(30, 41, 59, 0.5) !important;
    color: #f1f5f9 !important;
    -webkit-text-fill-color: #f1f5f9 !important;
}

/* Remove number input spinners for cleaner look */
input[type="number"].gc-input::-webkit-outer-spin-button,
input[type="number"].gc-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Ensure autofill doesn't override our dark theme colors */
.gc-input:-webkit-autofill,
.gc-input:-webkit-autofill:hover,
.gc-input:-webkit-autofill:focus,
.gc-input:-webkit-autofill:active {
    -webkit-box-shadow: 0 0 0 30px rgba(30, 41, 59, 0.95) inset !important;
    -webkit-text-fill-color: #f1f5f9 !important;
    caret-color: #f1f5f9;
    background-color: rgba(30, 41, 59, 0.5) !important;
}

.gc-input:focus {
    outline: none;
    border-color: var(--gc-primary);
    background: rgba(30, 41, 59, 0.9) !important;
    background-color: rgba(30, 41, 59, 0.9) !important;
    box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.1);
    -webkit-transform: translateY(-1px);
    -ms-transform: translateY(-1px);
    transform: translateY(-1px);
    color: #f1f5f9 !important;
    -webkit-text-fill-color: #f1f5f9 !important;
}

.gc-input::placeholder {
    color: #94a3b8;
    opacity: 0.8;
    -webkit-text-fill-color: #94a3b8;
}

/* Select element styling */
select.gc-input {
    color: #f1f5f9 !important;
    background-color: rgba(30, 41, 59, 0.5) !important;
    -webkit-text-fill-color: #f1f5f9 !important;
}

select.gc-input option {
    background-color: #1e293b;
    color: #f1f5f9;
}

.gc-help-text {
    font-size: 0.75rem;
    color: var(--gc-text-secondary);
    font-style: italic;
}

/* Info tooltip icons */
.gc-info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    width: 1rem;
    height: 1rem;
    margin-left: 0.25rem;
    color: var(--gc-primary);
    cursor: help;
    opacity: 0.7;
    transition: all 0.2s ease;
    vertical-align: middle;
    position: relative;
}

.gc-info-icon:hover {
    opacity: 1;
    transform: scale(1.2);
    color: var(--gc-secondary);
}

/* Custom tooltip styling */
.gc-info-icon::after {
    content: attr(title);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: #f1f5f9;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-style: normal;
    font-weight: 400;
    white-space: nowrap;
    max-width: 250px;
    white-space: normal;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1000;
    pointer-events: none;
}

.gc-info-icon::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 2px);
    left: 50%;
    -webkit-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #1e293b;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1000;
}

/* Show tooltip on hover (desktop) and focus/active (mobile touch) */
.gc-info-icon:hover::after,
.gc-info-icon:hover::before,
.gc-info-icon:focus::after,
.gc-info-icon:focus::before,
.gc-info-icon:active::after,
.gc-info-icon:active::before {
    opacity: 1;
    visibility: visible;
}

/* Assignment/Course Rows */
.gc-assignment-row,
.gc-course-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: var(--gc-spacing-md);
    align-items: end;
    padding: var(--gc-spacing-md);
    background: rgba(20, 184, 166, 0.03);
    border-radius: var(--gc-radius-md);
    border: 1px solid var(--gc-border);
    transition: var(--gc-transition-fast);
    animation: slideIn 0.3s ease;
    contain: layout style;
    will-change: transform, opacity;
}

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

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

.gc-assignment-row:hover,
.gc-course-row:hover {
    background: rgba(20, 184, 166, 0.06);
    border-color: var(--gc-primary);
    transform: translateX(4px);
}

#gc-assignments-container,
#gc-courses-container {
    display: flex;
    flex-direction: column;
    gap: var(--gc-spacing-md);
}

/* Buttons */
.gc-btn {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--gc-radius-md);
    cursor: pointer;
    transition: var(--gc-transition);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--gc-spacing-xs);
    position: relative;
    overflow: hidden;
    text-transform: none;
    /* Mobile touch improvements */
    min-height: var(--gc-touch-target);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    /* Prevent text selection on double tap */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.gc-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.gc-btn:hover::before {
    width: 300px;
    height: 300px;
}

.gc-btn span {
    position: relative;
    z-index: 1;
}

.gc-btn-primary {
    background: linear-gradient(135deg, var(--gc-primary), var(--gc-secondary));
    color: white;
    box-shadow: var(--gc-shadow-md);
}

.gc-btn-primary:hover {
    -webkit-transform: translateY(-2px);
    -ms-transform: translateY(-2px);
    transform: translateY(-2px);
    box-shadow: var(--gc-shadow-lg);
}

.gc-btn-primary:active {
    transform: translateY(0);
}

.gc-btn-secondary {
    background: rgba(20, 184, 166, 0.1);
    color: var(--gc-primary);
    border: 2px solid var(--gc-primary);
}

.gc-btn-secondary:hover {
    background: rgba(20, 184, 166, 0.2);
    -webkit-transform: translateY(-2px);
    -ms-transform: translateY(-2px);
    transform: translateY(-2px);
}

.gc-btn-outline {
    background: transparent;
    color: var(--gc-text-secondary);
    border: 2px solid var(--gc-border);
}

.gc-btn-outline:hover {
    background: rgba(20, 184, 166, 0.05);
    border-color: var(--gc-primary);
    color: var(--gc-primary);
}

.gc-btn-remove {
    width: 2.5rem;
    height: 2.5rem;
    min-width: var(--gc-touch-target);
    min-height: var(--gc-touch-target);
    padding: 0;
    font-size: 1.5rem;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 2px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--gc-radius-sm);
    cursor: pointer;
    transition: var(--gc-transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 300;
    line-height: 1;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.gc-btn-remove:hover {
    background: #ef4444;
    color: white;
    -webkit-transform: scale(1.1) rotate(90deg);
    -ms-transform: scale(1.1) rotate(90deg);
    transform: scale(1.1) rotate(90deg);
}

/* Actions Container */
.gc-actions {
    display: flex;
    gap: var(--gc-spacing-md);
    margin-top: var(--gc-spacing-md);
}

.gc-actions .gc-btn {
    flex: 1;
}

/* Results */
.gc-result {
    margin-top: var(--gc-spacing-lg);
    padding: var(--gc-spacing-xl);
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1), rgba(45, 212, 191, 0.1));
    border-radius: var(--gc-radius-lg);
    border: 2px solid var(--gc-primary);
    animation: resultAppear 0.5s ease;
}

@keyframes resultAppear {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }

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

.gc-result-content {
    text-align: center;
}

.gc-result-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gc-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--gc-spacing-sm);
}

.gc-result-value {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gc-primary), var(--gc-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: var(--gc-spacing-sm) 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.gc-result-letter {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gc-text-primary);
    margin-top: var(--gc-spacing-xs);
}

.gc-result-message {
    margin-top: var(--gc-spacing-md);
    padding: var(--gc-spacing-md);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--gc-radius-md);
    font-weight: 500;
    color: var(--gc-text-primary);
}

@media (prefers-color-scheme: dark) {
    .gc-result-message {
        background: rgba(30, 41, 59, 0.5);
    }
}

.gc-result-details {
    margin-top: var(--gc-spacing-md);
    padding: var(--gc-spacing-md);
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--gc-radius-md);
    font-size: 0.875rem;
    color: var(--gc-text-secondary);
}

@media (prefers-color-scheme: dark) {
    .gc-result-details {
        background: rgba(30, 41, 59, 0.3);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .gc-pro-container {
        padding: var(--gc-spacing-md);
    }

    .gc-pro-card {
        padding: var(--gc-spacing-lg);
    }

    .gc-pro-title {
        font-size: 1.5rem;
    }

    .gc-pro-icon {
        font-size: 2rem;
    }

    .gc-assignment-row,
    .gc-course-row {
        grid-template-columns: 1fr;
        gap: var(--gc-spacing-sm);
    }

    .gc-btn-remove {
        justify-self: end;
        margin-top: var(--gc-spacing-sm);
    }

    .gc-actions {
        flex-direction: column;
    }

    .gc-result-value {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .gc-pro-title {
        font-size: 1.25rem;
        flex-direction: column;
        gap: 0.25rem;
    }

    .gc-result-value {
        font-size: 2rem;
    }

    .gc-btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.9375rem;
    }
}

/* Loading State */
.gc-btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.gc-btn.loading::after {
    content: '';
    width: 1rem;
    height: 1rem;
    border: 2px solid white;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: var(--gc-spacing-xs);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Success/Error States */
.gc-result.success {
    border-color: #10b981;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(34, 197, 94, 0.1));
}

.gc-result.warning {
    border-color: #f59e0b;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(251, 191, 36, 0.1));
}

.gc-result.error {
    border-color: #ef4444;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(248, 113, 113, 0.1));
}

/* Error input state */
.gc-input-error {
    border-color: #ef4444 !important;
    background: rgba(239, 68, 68, 0.05);
    animation: shake 0.3s ease;
}

.gc-input-error:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.2) !important;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

/* Accessibility - Focus visible (not just focus) */
.gc-input:focus-visible,
.gc-btn:focus-visible {
    outline: 3px solid var(--gc-primary);
    outline-offset: 2px;
}


/* Mode Switcher */
.gc-mode-switcher {
    display: flex;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid var(--gc-border);
    border-radius: var(--gc-radius-md);
    padding: 0.25rem;
    margin-bottom: var(--gc-spacing-xl);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

@media (prefers-color-scheme: dark) {
    .gc-mode-switcher {
        background: rgba(0, 0, 0, 0.2);
    }
}

.gc-mode-option {
    flex: 1;
    position: relative;
    cursor: pointer;
    text-align: center;
}

.gc-mode-option input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.gc-mode-label {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gc-text-secondary);
    border-radius: var(--gc-radius-sm);
    transition: all 0.2s ease;
    white-space: nowrap;
    text-align: center;
}

.gc-mode-option input:checked+.gc-mode-label {
    background: var(--gc-primary);
    color: white;
    font-weight: 600;
    box-shadow: var(--gc-shadow-sm);
}

.gc-mode-option:hover .gc-mode-label {
    color: var(--gc-primary);
}

.gc-mode-option input:checked:hover .gc-mode-label {
    color: white;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Mode Visibility Utilities */
[data-mode="percentage"] .gc-assignment-grade-letter,
[data-mode="points"] .gc-assignment-grade-letter {
    display: none !important;
}

[data-mode="letters"] .gc-assignment-grade {
    display: none !important;
}