/* ========================================
   DATE & TIME CALCULATOR STYLES
   Extends styles.css with temporal theme
======================================== */

/* ========================================
   DATETIME CONTAINER
======================================== */
.datetime-container {
    width: 100%;
    max-width: 580px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: visible;
    transition: max-width var(--transition-normal);
}

/* ========================================
   CATEGORY SELECTOR - Purple/Violet Theme
======================================== */
.category-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-xs);
    padding: var(--gap-md);
    background: linear-gradient(135deg, #e9d5ff 0%, #d8b4fe 100%);
    border-bottom: 2px solid #c084fc;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.category-btn {
    padding: 0.65rem 0.5rem;
    border: none;
    background: white;
    color: #6b21a8;
    font-weight: 600;
    font-size: 0.7rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
    touch-action: manipulation; /* Prevents double-tap zoom */
    position: relative;
    overflow: hidden;
}

.category-btn::before {
    content: '⏰';
    position: absolute;
    top: 50%;
    left: -100%;
    transform: translateY(-50%);
    font-size: 2.5rem;
    opacity: 0.15;
    transition: left 0.5s;
}

.category-btn:hover::before {
    left: 100%;
}

.category-btn:hover {
    background: #faf5ff;
    transform: translateY(-1px);
    border: 2px solid #c084fc;
}

.category-btn.active {
    background: linear-gradient(135deg, #9333ea, #7e22ce);
    color: white;
    box-shadow: 0 0 15px rgba(147, 51, 234, 0.5);
}

/* ========================================
   CALCULATOR SELECTION - Cyan Theme
======================================== */
.calculator-selection {
    padding: var(--gap-md);
    background: linear-gradient(135deg, #cffafe 0%, #a5f3fc 100%);
    border-bottom: 2px solid #67e8f9;
}

.selection-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    color: #164e63;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calculator-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #67e8f9;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: #1e293b;
    background: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calculator-select:focus {
    outline: none;
    border-color: #06b6d4;
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.calculator-select:hover {
    border-color: #22d3ee;
}

/* ========================================
   CALCULATOR INTERFACE
======================================== */
.calculator-interface {
    padding: var(--gap-md);
}

.calculator-header {
    margin-bottom: var(--gap-md);
    padding-bottom: var(--gap-sm);
    border-bottom: 2px solid #f1f5f9;
}

.calculator-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0;
}

/* ========================================
   FORMULA DISPLAY - Purple Gradient
======================================== */
.formula-display {
    background: linear-gradient(135deg, #e9d5ff 0%, #d8b4fe 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #c084fc;
    position: relative;
    overflow: hidden;
}

.formula-display::after {
    content: '📅';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 4rem;
    opacity: 0.15;
    transform: rotate(-15deg);
}

.formula-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: #6b21a8;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.formula-equation {
    font-size: 1.125rem;
    color: #581c87;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    word-wrap: break-word;
    position: relative;
    z-index: 1;
}

/* ========================================
   INPUT FIELDS
======================================== */
.input-fields {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-md);
    margin-bottom: var(--gap-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--gap-xs);
}

.input-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
}

.input-symbol {
    font-family: 'Courier New', monospace;
    color: #9333ea;
    font-weight: 700;
}

.input-wrapper {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--gap-xs);
}

.datetime-input {
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    color: #1e293b;
    background: white;
    transition: all var(--transition-fast);
}

.datetime-input:focus {
    outline: none;
    border-color: #9333ea;
    box-shadow: 0 0 0 3px rgba(147, 51, 234, 0.1);
}

.input-unit {
    padding: 0.75rem;
    background: #faf5ff;
    border: 2px solid #e9d5ff;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    color: #6b21a8;
    min-width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   CALCULATE BUTTON - Clock Animation
======================================== */
.calculate-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #9333ea, #7e22ce);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(147, 51, 234, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-sm);
    margin-bottom: var(--gap-md);
    position: relative;
    overflow: hidden;
}

.calculate-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;
}

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

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(147, 51, 234, 0.6);
    background: linear-gradient(135deg, #7e22ce, #6b21a8);
}

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

.calculate-btn svg {
    transition: transform var(--transition-fast);
    position: relative;
    z-index: 1;
    animation: tickTock 2s infinite;
}

@keyframes tickTock {

    0%,
    100% {
        transform: rotate(0deg);
    }

    25% {
        transform: rotate(10deg);
    }

    75% {
        transform: rotate(-10deg);
    }
}

.calculate-btn:hover svg {
    animation: spinClock 1s linear;
}

@keyframes spinClock {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

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

/* ========================================
   RESULT DISPLAY - Cyan Glow
======================================== */
.result-display {
    background: linear-gradient(135deg, #cffafe 0%, #a5f3fc 100%);
    padding: var(--gap-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #22d3ee;
    text-align: center;
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
    position: relative;
}

.result-display::before {
    content: '⏱️';
    position: absolute;
    top: 5px;
    left: 15px;
    font-size: 2rem;
    opacity: 0.3;
}

.result-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #164e63;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #0e7490;
    font-family: 'Courier New', monospace;
    margin-bottom: var(--gap-xs);
    word-wrap: break-word;
    text-shadow: 0 2px 4px rgba(14, 116, 144, 0.2);
    white-space: pre-line;
    line-height: 1.4;
    font-size: 0.875rem;
    text-align: left;
}

.result-unit {
    font-size: 1rem;
    font-weight: 600;
    color: #155e75;
}

/* ========================================
   EXPLANATION SECTION
======================================== */
.explanation-section {
    background: #f8fafc;
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #e2e8f0;
}

.explanation-section h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.explanation-section p {
    font-size: 0.8125rem;
    line-height: 1.6;
    color: #475569;
    margin: 0;
}

/* ========================================
   QUICK REFERENCE
======================================== */
.quick-reference {
    background: linear-gradient(135deg, #e9d5ff 0%, #d8b4fe 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    border: 2px solid #c084fc;
    margin-bottom: var(--gap-md);
}

.quick-reference h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: #6b21a8;
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.reference-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-xs);
}

.reference-item {
    background: white;
    padding: var(--gap-sm);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    border: 2px solid #e9d5ff;
    transition: all var(--transition-fast);
}

.reference-item:hover {
    border-color: #9333ea;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.ref-name {
    color: var(--secondary-color);
    font-weight: 600;
}

.ref-value {
    color: #7e22ce;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

/* ========================================
   CALENDAR FACTS
======================================== */
.facts-reference {
    background: linear-gradient(135deg, #cffafe 0%, #a5f3fc 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    border: 2px solid #22d3ee;
}

.facts-reference h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: #164e63;
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.facts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-xs);
}

.fact-item {
    background: white;
    padding: var(--gap-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    border: 1px solid #a5f3fc;
    transition: all var(--transition-fast);
}

.fact-item:hover {
    border-color: #06b6d4;
    transform: translateX(4px);
}

.fact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.fact-text {
    font-size: 0.75rem;
    color: #0e7490;
    font-weight: 500;
    line-height: 1.4;
}

/* ========================================
   RESPONSIVE BREAKPOINTS
======================================== */

/* Small tablets and larger phones (576px+) */
@media (min-width: 576px) {
    .datetime-container {
        max-width: 600px;
    }

    .category-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .category-btn {
        font-size: 0.75rem;
        padding: 0.75rem 0.5rem;
    }

    .calculator-header h2 {
        font-size: 1.25rem;
    }

    .input-fields {
        grid-template-columns: repeat(2, 1fr);
    }

    .reference-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Tablets (768px+) */
@media (min-width: 768px) {
    .datetime-container {
        max-width: 640px;
    }

    .category-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .category-btn {
        font-size: 0.8125rem;
    }

    .formula-equation {
        font-size: 1.25rem;
    }

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

/* Desktops (1024px+) */
@media (min-width: 1024px) {
    .datetime-container {
        max-width: 680px;
    }

    .calculator-header h2 {
        font-size: 1.375rem;
    }
}

/* Large desktops (1280px+) */
@media (min-width: 1280px) {
    .datetime-container {
        max-width: 720px;
    }
}

/* ========================================
   PRINT STYLES
======================================== */
@media print {

    .category-selector,
    .calculate-btn,
    .quick-reference,
    .facts-reference {
        display: none;
    }

    .datetime-container {
        box-shadow: none;
    }
}