:root {
    --bg-dark: #0f172a;
    --accent-primary: #8b5cf6;
    --accent-secondary: #ec4899;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glow: 0 0 20px rgba(139, 92, 246, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

.background-glow {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    opacity: 0.2;
    filter: blur(80px);
    z-index: -1;
    animation: drift 10s infinite alternate ease-in-out;
}

@keyframes drift {
    0% {
        transform: translate(-50px, -50px);
    }

    100% {
        transform: translate(50px, 50px);
    }
}

.container {
    width: 100%;
}

.fullscreen-section {
    min-height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    scroll-snap-align: start;
    padding: 2rem;
}

.placeholder-section h2 {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.title {
    font-weight: 300;
    font-size: 2.5rem;
    letter-spacing: 2px;
    margin-bottom: 2rem;
    text-transform: uppercase;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.triangle-container {
    position: relative;
    width: 400px;
    height: 350px;
    margin: 0 auto;
}

.triangle-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.5;
}

.input-group {
    position: absolute;
    width: 140px;
    animation: fadeIn 0.8s ease-out backwards;
}

.voltage-group {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 0.1s;
}

.current-group {
    bottom: 0;
    left: 0;
    animation-delay: 0.2s;
}

.resistance-group {
    bottom: 0;
    right: 0;
    animation-delay: 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px) translateX(var(--tx, 0));
    }

    to {
        opacity: 1;
        transform: translateY(0) translateX(var(--tx, 0));
    }
}

/* Fix transform for centered element */
.voltage-group {
    --tx: -50%;
}

.current-group {
    --tx: 0;
}

.resistance-group {
    --tx: 0;
}

label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.input-wrapper {
    display: flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    overflow: hidden;
    transition: all 0.3s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: var(--glow);
}

input {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 10px;
    font-size: 1.1rem;
    font-family: inherit;
    outline: none;
}

/* Remove Arrows/Spinners */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

select {
    background: rgba(0, 0, 0, 0.3);
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0 10px;
    outline: none;
    cursor: pointer;
    font-family: inherit;
}

select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

.formula-display {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    width: 60%;
    pointer-events: none;
    font-style: italic;
    opacity: 0.8;
}

.calculated {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-primary);
}

.calculated input {
    color: var(--accent-primary);
}

.reset-btn {
    display: block;
    margin: 2rem auto;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 10px 30px;
    border-radius: 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    backdrop-filter: blur(5px);
}

.reset-btn:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
    transform: translateY(-2px);
}

/* FAB Styles */
.fab-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 100;
}

.fab-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.fab-btn svg {
    width: 32px;
    height: 32px;
}

.fab-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.5);
}

.fab-menu {
    position: absolute;
    top: 70px;
    right: 0;
    width: 180px;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.5rem;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.fab-container:hover .fab-menu,
.fab-menu:hover {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 10px;
    border-radius: 8px;
    transition: background 0.2s;
    font-size: 0.95rem;
    display: block;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent-primary);
}

/* AC Power Section Layout */
.ac-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 4rem;
    width: 100%;
    max-width: 1000px;
}

.controls-panel {
    flex: 1;
    min-width: 300px;
    background: rgba(15, 23, 42, 0.6);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.input-group-linear {
    margin-bottom: 1.5rem;
    text-align: left;
}

.input-group-linear label {
    margin-left: 0.5rem;
}

.toggle-wrapper select {
    width: 100%;
    padding: 10px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

/* New Grid Layout for AC Inputs */
.ac-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 600px) {
    .ac-input-grid {
        grid-template-columns: 1fr;
        /* Stack on mobile */
    }
}

.canvas-wrapper {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 20px;
    padding: 1rem;
    border: 1px solid var(--glass-border);
}

#power-canvas {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.results-panel {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.value-text {
    color: var(--accent-secondary);
    font-weight: 600;
}

.small-btn {
    margin: 1rem 0 0 0;
    width: 100%;
}

/* Resistivity Section Specifics */
.resistivity-container .top-split-group {
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    min-width: 280px;
}

.split-input-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.mini-input-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.mini-input-wrapper input {
    width: 100px;
    /* Smaller inputs for top */
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px 8px 0 0;
    border-bottom: none;
    padding: 8px;
    font-size: 1rem;
    text-align: center;
}

.mini-input-wrapper select {
    width: 100px;
    border-radius: 0 0 8px 8px;
    font-size: 0.8rem;
    padding: 2px 5px;
}

.multiply-symbol {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: bold;
    padding-top: 15px;
    /* Align with inputs */
}

/* Highlight calculated fields in split row */
.mini-input-wrapper.calculated input {
    color: var(--accent-primary);
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--accent-primary);
}