:root {
    /* Primary Colors */
    --tracker-primary: #2563eb;
    --tracker-primary-dark: #1d4ed8;
    --tracker-primary-light: #dbeafe;
    --tracker-primary-hover: #1d4ed8;
    --tracker-primary-shadow: rgb(37 99 235 / 25%);
    
    /* Semantic Colors */
    --tracker-success: #10b981;
    --tracker-success-dark: #059669;
    --tracker-warning: #f59e0b;
    --tracker-warning-dark: #d97706;
    --tracker-danger: #ef4444;
    --tracker-danger-dark: #dc2626;
    --tracker-info: #3b82f6;
    
    /* Surface Colors */
    --tracker-surface: #ffffff;
    --tracker-surface-muted: #f8fafc;
    --tracker-surface-elevated: #ffffff;
    --tracker-background: #f1f5f9;
    --tracker-secondary-bg: #e2e8f0;
    
    /* Border Colors */
    --tracker-border: #e2e8f0;
    --tracker-border-light: #f1f5f9;
    --tracker-border-dark: #cbd5e1;
    
    /* Text Colors */
    --tracker-text-main: #0f172a;
    --tracker-text-muted: #64748b;
    --tracker-text-light: #94a3b8;
    --tracker-text-inverse: #ffffff;
    
    /* Shadow System */
    --tracker-shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --tracker-shadow-sm: 0 1px 2px rgb(15 23 42 / 0.08);
    --tracker-shadow-md: 0 4px 12px rgb(15 23 42 / 0.08);
    --tracker-shadow-lg: 0 12px 24px rgb(15 23 42 / 0.12);
    --tracker-shadow-xl: 0 20px 25px rgb(15 23 42 / 0.1);
    
    /* Border Radius */
    --tracker-radius-sm: 0.5rem;
    --tracker-radius-md: 1rem;
    --tracker-radius-lg: 1.5rem;
    --tracker-radius-xl: 2rem;
    --tracker-radius-full: 9999px;
    
    /* Legacy Variables */
    --primary-color: var(--tracker-primary);
    --primary-color-light: var(--tracker-primary-light);
    --surface-color: var(--tracker-surface);
    --light-bg: var(--tracker-background);
    --border-color: var(--tracker-border);
    --text-primary: var(--tracker-text-main);
    --text-secondary: var(--tracker-text-muted);
    --secondary-color: var(--tracker-text-muted);
    --success-color: var(--tracker-success);
    --info-color: var(--tracker-info);
    --warning-color: var(--tracker-warning);
    --danger-color: var(--tracker-danger);
    --dark-text: var(--tracker-text-main);
    --border-radius: var(--tracker-radius-lg);
    --shadow: var(--tracker-shadow-md);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Angle Converter Variables (for educational content styling) */
    --angle-primary: #2563eb;
    --angle-primary-dark: #1d4ed8;
    --angle-accent: #0ea5e9;
    --angle-surface: #ffffff;
    --angle-border: #e2e8f0;
    --angle-text: #0f172a;
    --angle-muted: #64748b;
    --angle-success: #22c55e;
    --angle-radius-lg: 1.5rem;
    --angle-radius-md: 1rem;
    --angle-radius-sm: 0.75rem;
    --angle-shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.08);
    --angle-shadow-lg: 0 30px 60px rgba(37, 99, 235, 0.12);

    /* related to and faqs component variables */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --border: #e2e8f0;
    --surface: #ffffff;
    --shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --surface-muted: #f4f6fb;
    --text-main: #0f172a;
    --text-muted: #64748b;
}

.add-time-calculator-page {
    padding: 2rem 0;
}

.calculator-intro {
    margin-bottom: 2rem;
}

.calculator-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--tracker-text-main);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.calculator-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--tracker-text-muted);
    margin-bottom: 1rem;
    max-width: 860px;
}

.calculator-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: flex-start;
    list-style: none;
    padding: 0;
    margin: 0;
}

.meta-chip {
    background: var(--tracker-surface);
    color: var(--tracker-text-main);
    padding: 0.5rem 1rem;
    border-radius: var(--tracker-radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--tracker-shadow-sm);
    border: 1px solid var(--tracker-border);
}

.calculator-main {
    margin: 0 auto;
}

.calculator-card {
    background: var(--tracker-surface);
    border-radius: var(--tracker-radius-lg);
    box-shadow: var(--tracker-shadow-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--tracker-border);
}

.calculator-layout {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 2rem;
    align-items: start;
}

.calculator-left-column {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.calculator-right-column {
    display: flex;
    flex-direction: column;
}

.calculator-form-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--tracker-primary-light);
    border: 1px solid var(--tracker-primary);
    border-radius: var(--tracker-radius-md);
    color: var(--tracker-primary-dark);
    font-size: 0.9375rem;
}

.status-bar svg {
    flex-shrink: 0;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--tracker-text-main);
    font-size: 0.9375rem;
}

.label-title {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tooltip {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.tooltip-trigger {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--tracker-border);
    background: var(--tracker-surface);
    color: var(--tracker-text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: help;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.tooltip-trigger:hover {
    background: var(--tracker-primary);
    color: var(--tracker-text-inverse);
    border-color: var(--tracker-primary);
}

.tooltiptext {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--tracker-text-main);
    color: var(--tracker-text-inverse);
    text-align: center;
    padding: 0.75rem 1rem;
    border-radius: var(--tracker-radius-md);
    font-size: 0.875rem;
    font-weight: 400;
    white-space: normal;
    z-index: 1000;
    transition: opacity 0.3s;
    pointer-events: none;
    max-width: 250px;
    box-shadow: var(--tracker-shadow-lg);
}

.tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--tracker-text-main);
}

.tooltip:hover .tooltiptext,
.tooltip-trigger:hover + .tooltiptext,
.tooltip-trigger:focus + .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.calculator-input,
.calculator-select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--tracker-border);
    border-radius: var(--tracker-radius-md);
    background: var(--tracker-surface);
    color: var(--tracker-text-main);
    transition: var(--transition);
    font-family: inherit;
}

.calculator-input:focus,
.calculator-select:focus {
    outline: none;
    border-color: var(--tracker-primary);
    box-shadow: 0 0 0 3px var(--tracker-primary-shadow);
}

.calculator-input:disabled {
    background: var(--tracker-surface-muted);
    cursor: not-allowed;
}

.calculator-input::placeholder {
    color: var(--tracker-text-light);
}

.time-inputs-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.time-inputs-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.time-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.time-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tracker-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.time-input-wrapper .calculator-input {
    text-align: center;
    font-weight: 600;
    font-size: 1.125rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.calculate-btn {
    flex: 1;
    min-width: 200px;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--tracker-primary) 0%, var(--tracker-primary-dark) 100%);
    color: var(--tracker-text-inverse);
    border: none;
    border-radius: var(--tracker-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--tracker-shadow-md);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--tracker-shadow-lg);
}

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

.calculate-btn:focus {
    outline: 2px solid var(--tracker-primary);
    outline-offset: 2px;
}

.ghost-btn {
    padding: 1rem 2rem;
    background: transparent;
    color: var(--tracker-text-muted);
    border: 2px solid var(--tracker-border);
    border-radius: var(--tracker-radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.ghost-btn:hover {
    background: var(--tracker-surface-muted);
    border-color: var(--tracker-border-dark);
}

.ghost-btn:focus {
    outline: 2px solid var(--tracker-primary);
    outline-offset: 2px;
}

.results-container {
    background: var(--tracker-surface);
    border-radius: var(--tracker-radius-lg);
    padding: 2rem;
    box-shadow: var(--tracker-shadow-lg);
    border: 1px solid var(--tracker-border);
    display: none;
}

.results-container.show {
    display: block;
    animation: fadeInUp 0.5s ease-out;
}

.results-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--tracker-border);
}

.results-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--tracker-text-main);
    margin: 0;
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.result-main {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--tracker-surface-muted) 0%, var(--tracker-secondary-bg) 100%);
    border-radius: var(--tracker-radius-md);
    border: 2px solid var(--tracker-border);
}

.result-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--tracker-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
}

.result-value {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--tracker-text-main);
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.result-date {
    font-size: 1.125rem;
    color: var(--tracker-text-muted);
}

.result-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.breakdown-item {
    padding: 1rem;
    background: var(--tracker-surface-muted);
    border-radius: var(--tracker-radius-md);
    border: 1px solid var(--tracker-border);
}

.breakdown-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tracker-text-muted);
    margin-bottom: 0.5rem;
}

.breakdown-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--tracker-text-main);
}

.result-actions {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--tracker-border);
}

.copy-buttons-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.copy-buttons-row .copy-button {
    flex: 1 1 calc(33.333% - 0.5rem);
    min-width: 140px;
}

.copy-button {
    background: #f1f5f9;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #405063 !important;
    border: 1px solid #dde3e7;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 0.5rem;
    padding: 0;
}

.copy-button:hover {
    background: #e2e8f0;
    border-color: #94a3b8;
    transform: translateY(-1px);
}

.copy-button.copied {
    background: #10b981;
    border-color: #10b981;
    color: #ffffff !important;
}

.copy-button:focus {
    outline: 2px solid var(--tracker-primary);
    outline-offset: 2px;
}

.copy-button svg {
    width: 16px;
    height: 16px;
}

.share-container {
    background: rgba(241, 245, 249, 0.8);
    border-radius: var(--tracker-radius-md);
    padding: 1rem 1.25rem;
    border: 1px solid var(--tracker-border);
    margin-top: 1rem;
}

.share-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--tracker-text-main);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.share-btn {
    flex: 1;
    min-width: 100px;
    padding: 0.75rem 1rem;
    border-radius: var(--tracker-radius-md);
    border: none;
    color: var(--tracker-text-inverse);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--tracker-shadow-md);
}

.share-btn:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

.share-x {
    background: #000000;
}

.share-x:hover {
    background: #1a1a1a;
}

.share-facebook {
    background: #1877f2;
}

.share-facebook:hover {
    background: #166fe5;
}

.share-linkedin {
    background: #0a66c2;
}

.share-linkedin:hover {
    background: #095195;
}

.share-reddit {
    background: #ff4500;
}

.share-reddit:hover {
    background: #e63e00;
}

.share-telegram {
    background: #0088cc;
}

.share-telegram:hover {
    background: #0077b5;
}

.share-whatsapp {
    background: #25d366;
}

.share-whatsapp:hover {
    background: #20ba5a;
}

.empty-state-content {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--tracker-text-muted);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--tracker-border-dark);
}

.invalid-feedback {
    display: none;
    color: var(--tracker-danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.calculator-input:invalid:not(:placeholder-shown) + .invalid-feedback {
    display: block;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

/* Educational Card Styles */
.angle-seo-section {
    padding: 2rem 0;
}

.angle-card {
    background: var(--angle-surface);
    border-radius: var(--angle-radius-lg);
    padding: clamp(2rem, 4vw, 3rem);
    box-shadow: var(--angle-shadow-sm);
    border: 1px solid var(--angle-border);
}

.angle-education-card h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.angle-education-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    margin-top: 2rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.angle-education-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.angle-education-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.angle-education-card a:hover {
    border-bottom-color: var(--primary);
}

/* Infographic styles */
.infographic-timeline {
    margin: 2rem 0;
    padding: 2rem;
    background: var(--surface-muted);
    border-radius: var(--radius-lg);
}

.infographic-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    text-align: center;
    margin-bottom: 2rem;
}

.infographic-conversion-formula {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin: 2rem 0;
}

.infographic-conversion-formula > .infographic-title {
    grid-column: 1 / -1;
    margin-bottom: 0;
}

.formula-box {
    padding: 1.5rem;
    background: var(--surface-muted);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.formula-box:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.formula-label {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.formula-content {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.75rem;
}

.formula-example {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .calculator-layout {
        grid-template-columns: 1fr;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
    
    .time-inputs-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .calculate-btn,
    .ghost-btn {
        width: 100%;
    }
    
    .result-breakdown {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .copy-buttons-row {
        flex-direction: column;
    }
    
    .copy-button {
        width: 100%;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .share-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .calculator-intro {
        padding: 0 0.5rem;
    }
    
    .calculator-card {
        padding: 1rem;
    }
    
    .time-inputs-row {
        grid-template-columns: 1fr;
    }
    
    .infographic-conversion-formula {
        grid-template-columns: 1fr;
    }
    
    .infographic-timeline {
        padding: 1.5rem;
    }
    
    .angle-education-card h2 {
        font-size: 1.75rem;
    }
    
    .angle-education-card h3 {
        font-size: 1.25rem;
    }
}