/* Mobile-first base styles */
:root {
    --primary-color: #1971c2;
    --primary-gradient: linear-gradient(to right, #1971c2, #339af0);
    --primary-hover: linear-gradient(to right, #1864ab, #1c7ed6);
    --primary-shadow: rgba(25, 113, 194, 0.3);
    --primary-shadow-hover: rgba(25, 113, 194, 0.4);
    --light-bg: rgba(255, 255, 255, 0.9);
    --light-section-bg: rgba(248, 249, 250, 0.8);
    --light-section-hover: rgba(248, 249, 250, 0.95);
    --light-text: #212529;
    --light-text-secondary: #495057;
    --light-border: rgba(0,0,0,0.05);
    --light-input-border: #dee2e6;
    --light-input-focus: #339af0;
    --light-link: #1971c2;
    --light-link-hover: #1864ab;
    
    --dark-bg: rgba(33, 37, 41, 0.9);
    --dark-section-bg: rgba(52, 58, 64, 0.8);
    --dark-section-hover: rgba(52, 58, 64, 0.95);
    --dark-text: #f8f9fa;
    --dark-text-secondary: #ced4da;
    --dark-border: rgba(255,255,255,0.05);
    --dark-input-border: #495057;
    --dark-input-focus: #339af0;
    --dark-link: #74c0fc;
    --dark-link-hover: #a5d8ff;
    
    /* Font family */
    --body-font: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    font-family: var(--body-font);
    transition: background-color 0.3s ease;
    min-height: 100vh;
    overflow-x: hidden;
}

body.dark-mode {
    background-color: #121212;
    color: var(--dark-text);
}

body.disco-mode {
    animation: disco-bg 8s infinite;
}

@keyframes disco-bg {
    0% { background-color: rgba(25, 113, 194, 0.1); }
    20% { background-color: rgba(64, 192, 87, 0.1); }
    40% { background-color: rgba(252, 196, 25, 0.1); }
    60% { background-color: rgba(250, 82, 82, 0.1); }
    80% { background-color: rgba(134, 80, 255, 0.1); }
    100% { background-color: rgba(25, 113, 194, 0.1); }
}

.header {
    z-index: 10;
    text-align: center;
    color: #FFF;
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    margin: 0 auto;
    padding: 0 15px;
}

.header h1 {
    margin: 0;
}

.header .site-title {
    font-size: 32px;
    display: block;
    line-height: 1.1;
    color: #FFF;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.header .site-description {
    font-size: 18px;
    display: block;
    line-height: 1.1;
    color: #FFF;
    margin-top: 10px;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.header .header-icons {
    margin-top: 15px;
}

.header .icon {
    text-align: center;
    color: #FFF;
    width: 20px;
    height: 20px;
    font-size: 20px;
    padding: 8px;
    margin: 5px;
    border-radius: 50%;
    border: 2px solid #FFF;
    transition: all .3s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.header .icon:hover {
    color: #24292e;
    background: #FFF;
    transform: scale(1.1);
}

/* Navbar styles */
.navbar {
    background-color: rgba(36, 41, 46, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    padding: 0.8rem 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.dark-mode .navbar {
    background-color: rgba(18, 20, 23, 0.9);
}

.navbar-brand {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 auto;
}

.navbar-icon {
    height: 24px;
    width: auto;
    color: #fff;
    margin-right: 0.5rem;
}

.theme-toggle, .disco-toggle {
    color: #fff;
    font-size: 1.2rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover, .disco-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.disco-toggle.active {
    color: #fd7e14;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* Floating reset button */
.floating-reset-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    z-index: 100;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    transform: scale(0);
}

.floating-reset-btn.visible {
    opacity: 1;
    transform: scale(1);
}

.floating-reset-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.1) rotate(15deg);
}

.floating-reset-btn:active {
    transform: scale(0.95);
}

#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.calculator-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 70px 15px 30px;
    position: relative;
    width: 100%;
    margin: 0 auto;
}

.calculator-box {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
    transition: all 0.3s ease;
    animation: fadeIn 1.2s ease-out;
    margin: 0 auto;
    position: relative;
    z-index: 10;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.dark-mode .calculator-box {
    background: var(--dark-bg);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.calculator-box h2 {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.dark-mode .calculator-box h2 {
    color: var(--dark-text);
}

.section-group {
    background: var(--light-section-bg);
    padding: 1.2rem;
    border-radius: 12px;
    margin-bottom: 1.2rem;
    transition: all 0.2s;
    border: 1px solid var(--light-border);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.dark-mode .section-group {
    background: var(--dark-section-bg);
    border: 1px solid var(--dark-border);
}

.section-group:hover {
    transform: translateY(-3px);
    background: var(--light-section-hover);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.dark-mode .section-group:hover {
    background: var(--dark-section-hover);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.section-group h3 {
    color: var(--light-text);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    font-weight: 600;
}

.dark-mode .section-group h3 {
    color: var(--dark-text);
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--light-text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.dark-mode .input-group label {
    color: var(--dark-text-secondary);
}

.input-group select, 
.input-group input {
    width: 100%;
    padding: 0.7rem;
    border: 2px solid var(--light-input-border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.2s;
    background-color: rgba(255, 255, 255, 0.9);
    -webkit-appearance: none;
    appearance: none;
}

.dark-mode .input-group select,
.dark-mode .input-group input {
    border: 2px solid var(--dark-input-border);
    background-color: rgba(33, 37, 41, 0.9);
    color: var(--dark-text);
}

/* Fix for iOS input styling */
.input-group input[type="number"] {
    -webkit-appearance: none;
    -moz-appearance: textfield;
}

.input-group select {
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="292.4" height="292.4"><path fill="%23495057" d="M287 69.4a17.6 17.6 0 0 0-13-5.4H18.4c-5 0-9.3 1.8-12.9 5.4A17.6 17.6 0 0 0 0 82.2c0 5 1.8 9.3 5.4 12.9l128 127.9c3.6 3.6 7.8 5.4 12.8 5.4s9.2-1.8 12.8-5.4L287 95c3.5-3.5 5.4-7.8 5.4-12.8 0-5-1.9-9.2-5.5-12.8z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 0.65rem auto;
    padding-right: 2rem;
}

.dark-mode .input-group select {
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="292.4" height="292.4"><path fill="%23ced4da" d="M287 69.4a17.6 17.6 0 0 0-13-5.4H18.4c-5 0-9.3 1.8-12.9 5.4A17.6 17.6 0 0 0 0 82.2c0 5 1.8 9.3 5.4 12.9l128 127.9c3.6 3.6 7.8 5.4 12.8 5.4s9.2-1.8 12.8-5.4L287 95c3.5-3.5 5.4-7.8 5.4-12.8 0-5-1.9-9.2-5.5-12.8z"/></svg>');
}

.input-group select:hover, 
.input-group input:hover {
    border-color: #adb5bd;
    background-color: rgba(255, 255, 255, 1);
}

.dark-mode .input-group select:hover,
.dark-mode .input-group input:hover {
    border-color: #6c757d;
    background-color: rgba(43, 47, 51, 0.9);
}

.input-group select:focus, 
.input-group input:focus {
    border-color: var(--light-input-focus);
    outline: none;
    box-shadow: 0 0 0 3px rgba(77, 171, 247, 0.25);
    background-color: rgba(255, 255, 255, 1);
}

.dark-mode .input-group select:focus,
.dark-mode .input-group input:focus {
    border-color: var(--dark-input-focus);
    background-color: rgba(43, 47, 51, 0.9);
    box-shadow: 0 0 0 3px rgba(77, 171, 247, 0.25);
}

/* Keyboard focus indicator */
.input-group input:focus-visible,
.input-group select:focus-visible {
    border-color: #228be6;
    box-shadow: 0 0 0 4px rgba(34, 139, 230, 0.3);
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-with-unit input {
    flex: 1;
}

.input-with-unit .unit {
    color: #495057;
    font-size: 0.85rem;
    min-width: 30px;
    text-align: left;
}

.dark-mode .input-with-unit .unit {
    color: #ced4da;
}

.time-inputs {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto;
    gap: 0.5rem;
    align-items: center;
}

.time-inputs input {
    width: 100%;
}

.time-inputs span {
    color: #495057;
}

.dark-mode .time-inputs span {
    color: #ced4da;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.calculate-btn, .reset-btn {
    padding: 0.9rem;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    -webkit-tap-highlight-color: transparent;
    flex: 1;
    color: white;
    border: none;
    position: relative;
    overflow: hidden;
}

.calculate-btn {
    background: var(--primary-gradient);
    box-shadow: 0 4px 10px var(--primary-shadow);
}

.reset-btn {
    background: var(--primary-gradient);
    box-shadow: 0 4px 10px var(--primary-shadow);
    opacity: 0.85;
}

.calculate-btn:hover, .reset-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px var(--primary-shadow-hover);
}

.reset-btn:hover {
    opacity: 1;
}

.calculate-btn:active, .reset-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.calculate-btn:focus-visible, .reset-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(34, 139, 230, 0.4);
}

.calculate-btn.clicked, .reset-btn.clicked {
    transform: scale(0.95);
    box-shadow: 0 2px 5px rgba(34, 139, 230, 0.4);
    background: linear-gradient(to right, #1864ab, #1c7ed6);
}

.results {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: var(--light-section-bg);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--light-border);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.dark-mode .results {
    background: var(--dark-section-bg);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--dark-border);
}

.results:hover {
    background: var(--light-section-hover);
}

.dark-mode .results:hover {
    background: var(--dark-section-hover);
}

.results h3 {
    color: var(--light-text);
    margin-bottom: 1.2rem;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
}

.dark-mode .results h3 {
    color: var(--dark-text);
}

.cost-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
    margin-bottom: 1.2rem;
}

.cost-item {
    display: flex;
    justify-content: space-between;
    padding: 0.7rem 1rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.dark-mode .cost-item {
    background: rgba(33, 37, 41, 0.9);
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.cost-item:hover {
    transform: scale(1.02);
    background: rgba(255, 255, 255, 1);
}

.dark-mode .cost-item:hover {
    background: rgba(43, 47, 51, 0.9);
}

.cost-item label {
    color: var(--light-text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.dark-mode .cost-item label {
    color: var(--dark-text-secondary);
}

.cost-item span {
    color: var(--primary-color);
    font-weight: 600;
}

.dark-mode .cost-item span {
    color: var(--dark-link);
}

.total-cost {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background: var(--primary-gradient);
    color: white;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(25, 113, 194, 0.25);
}

.dark-mode .total-cost {
    box-shadow: 0 4px 12px rgba(25, 113, 194, 0.4);
}

.update-animation {
    animation: highlight 0.4s ease-out;
}

@keyframes highlight {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes fadeIn {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.footer {
    background: rgba(36, 41, 46, 0.9);
    padding: 15px 0;
    text-align: center;
    position: relative;
    z-index: 10;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 -3px 10px rgba(0, 0, 0, 0.2);
}

.dark-mode .footer {
    background: rgba(18, 20, 23, 0.9);
}

.footer p {
    margin: 0;
    color: #fff;
}

.footer a {
    color: var(--light-link);
    text-decoration: none;
    transition: color 0.3s;
    text-decoration: underline;
}

.dark-mode .footer a {
    color: var(--dark-link);
}

.footer a:hover {
    color: var(--light-link-hover);
    text-decoration: underline;
}

.dark-mode .footer a:hover {
    color: var(--dark-link-hover);
}

/* Responsive styles */
@media (min-width: 576px) {
    .navbar-brand {
        font-size: 1.5rem;
    }
    
    .header {
        top: 30px;
    }
    
    .header .site-title {
        font-size: 38px;
    }
    
    .header .site-description {
        font-size: 20px;
    }
    
    .calculator-wrapper {
        padding-top: 100px;
        height: 100vh;
        overflow-y: auto;
    }
    
    .calculator-box {
        max-width: 450px;
        padding: 2rem;
        max-height: calc(100vh - 140px);
        overflow-y: auto;
    }
    
    .calculator-box h2 {
        font-size: 1.8rem;
    }
    
    .section-group {
        padding: 1.5rem;
    }
    
    .section-group h3 {
        font-size: 1.2rem;
    }
    
    .cost-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .input-group label {
        font-size: 1rem;
    }
}

@media (min-width: 992px) {
    .header {
        top: 40px;
    }
    
    .header .site-title {
        font-size: 44px;
    }
    
    .header .site-description {
        font-size: 22px;
    }
    
    .calculator-wrapper {
        padding-top: 80px;
        height: 100vh;
        align-items: center;
    }
    
    .calculator-box {
        max-width: 900px; /* Wider for desktop */
        padding: 2.5rem;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        grid-column-gap: 2rem;
        grid-template-areas:
            "title title"
            "materials time"
            "additional additional"
            "calculate calculate"
            "results results";
        max-height: calc(100vh - 140px);
        overflow-y: auto;
    }
    
    .calculator-box h2 {
        font-size: 2rem;
        grid-area: title;
    }
    
    .calculator-box .section-group:nth-child(2) {
        grid-area: materials;
    }
    
    .calculator-box .section-group:nth-child(3) {
        grid-area: time;
    }
    
    .calculator-box .section-group:nth-child(4) {
        grid-area: additional;
    }
    
    .button-group {
        grid-area: calculate;
    }
    
    .results {
        grid-area: results;
    }
    
    .section-group h3 {
        font-size: 1.3rem;
    }
    
    .calculate-btn, .reset-btn {
        font-size: 1.2rem;
        padding: 1rem;
    }
    
    .total-cost {
        font-size: 1.3rem;
    }
}

/* When screen is extra large, make the calculator even wider */
@media (min-width: 1200px) {
    .calculator-box {
        max-width: 1200px;
        grid-column-gap: 3rem;
    }
    
    .cost-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 1.5rem;
    }
}

/* Compact view for landscape mode on small devices */
.compact-view .section-group {
    padding: 0.8rem;
    margin-bottom: 0.8rem;
}

.compact-view .section-group h3 {
    margin-bottom: 0.7rem;
    font-size: 1rem;
}

.compact-view .input-group {
    margin-bottom: 0.6rem;
}

.compact-view .input-group label {
    margin-bottom: 0.3rem;
}

.compact-view .input-group select,
.compact-view .input-group input {
    padding: 0.5rem;
}

.compact-view .calculate-btn,
.compact-view .reset-btn {
    padding: 0.7rem;
}

.compact-view .results {
    padding: 1rem;
    margin-top: 1rem;
}

.compact-view .results h3 {
    margin-bottom: 0.8rem;
}

.compact-view .cost-grid {
    gap: 0.5rem;
    margin-bottom: 0.8rem;
}

.compact-view .cost-item {
    padding: 0.5rem 0.8rem;
}

.compact-view .total-cost {
    padding: 0.8rem;
}

/* Fix for iOS and Safari inputs */
@supports (-webkit-overflow-scrolling: touch) {
    .input-group input[type="number"] {
        font-size: 16px; /* Prevents iOS zoom on focus */
    }
    
    .input-group select {
        font-size: 16px;
    }
}

/* Ripple effect */
.ripple {
    position: absolute;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Disco mode particles */
.disco-mode #particles-js canvas {
    animation: disco-particles 8s infinite;
}

@keyframes disco-particles {
    0% { filter: hue-rotate(0deg); }
    100% { filter: hue-rotate(360deg); }
}