lightview/docs/calculator.css

A reactive UI library with features of Bau, Juris, and HTMX plus safe LLM UI generation

/* === DESIGN TOKENS === */
:root {
    --calc-bg: linear-gradient(145deg, #1a1b2e 0%, #16172b 100%);
    --calc-surface: rgba(255, 255, 255, 0.03);
    --calc-surface-hover: rgba(255, 255, 255, 0.08);
    --calc-border: rgba(255, 255, 255, 0.08);
    --calc-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
    --calc-glow: 0 0 80px rgba(99, 102, 241, 0.15);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-dimmed: #64748b;

    --btn-number: linear-gradient(145deg, #2a2d4a, #1e2039);
    --btn-operator: linear-gradient(145deg, #4f46e5, #4338ca);
    --btn-equals: linear-gradient(145deg, #10b981, #059669);
    --btn-clear: linear-gradient(145deg, #ef4444, #dc2626);
    --btn-function: linear-gradient(145deg, #3b3f5c, #2d3047);

    --btn-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    --btn-shadow-pressed: inset 0 2px 8px rgba(0, 0, 0, 0.4);

    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === GLOBAL RESET & BASE === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #0f0f1a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
}

/* Animated background orbs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    z-index: 0;
    animation: float 8s ease-in-out infinite;
}

body::before {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #6366f1 0%, transparent 70%);
    top: -100px;
    left: -100px;
}

body::after {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, #10b981 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
    animation-delay: -4s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(30px, 30px) scale(1.1);
    }
}

/* === CALCULATOR CONTAINER === */
.calculator {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 380px;
    background: var(--calc-bg);
    border-radius: var(--radius-xl);
    padding: 28px;
    box-shadow: var(--calc-shadow), var(--calc-glow);
    border: 1px solid var(--calc-border);
    backdrop-filter: blur(10px);
}

.calculator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, transparent 100%);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    pointer-events: none;
}

/* === DISPLAY AREA === */
.display {
    background: var(--calc-surface);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    margin-bottom: 24px;
    border: 1px solid var(--calc-border);
    position: relative;
    overflow: hidden;
}

.display::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.expression {
    font-size: 1rem;
    color: var(--text-dimmed);
    min-height: 1.5rem;
    text-align: right;
    font-weight: 400;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    word-break: break-all;
}

.result {
    font-size: 3rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: right;
    line-height: 1.1;
    letter-spacing: -1px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    text-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
    overflow: hidden;
    text-overflow: ellipsis;
}

/* === BUTTON GRID === */
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.btn {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::before {
    opacity: 1;
}

.btn:active {
    transform: scale(0.94);
}

.btn-number {
    background: var(--btn-number);
    color: var(--text-primary);
    box-shadow: var(--btn-shadow);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-number:hover {
    background: linear-gradient(145deg, #363a5c, #252846);
}

.btn-operator {
    background: var(--btn-operator);
    color: white;
    box-shadow: var(--btn-shadow), 0 0 20px rgba(99, 102, 241, 0.3);
}

.btn-operator:hover {
    background: linear-gradient(145deg, #5d54f5, #4f46e5);
    box-shadow: var(--btn-shadow), 0 0 30px rgba(99, 102, 241, 0.5);
}

.btn-equals {
    background: var(--btn-equals);
    color: white;
    box-shadow: var(--btn-shadow), 0 0 20px rgba(16, 185, 129, 0.3);
}

.btn-equals:hover {
    background: linear-gradient(145deg, #22c994, #10b981);
    box-shadow: var(--btn-shadow), 0 0 30px rgba(16, 185, 129, 0.5);
}

.btn-clear {
    background: var(--btn-clear);
    color: white;
    box-shadow: var(--btn-shadow), 0 0 20px rgba(239, 68, 68, 0.2);
}

.btn-clear:hover {
    background: linear-gradient(145deg, #f87171, #ef4444);
    box-shadow: var(--btn-shadow), 0 0 30px rgba(239, 68, 68, 0.4);
}

.btn-function {
    background: var(--btn-function);
    color: var(--text-secondary);
    box-shadow: var(--btn-shadow);
    font-size: 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.btn-function:hover {
    background: linear-gradient(145deg, #474b6e, #3b3f5c);
    color: var(--text-primary);
}

.btn-wide {
    grid-column: span 2;
    aspect-ratio: auto;
    height: 70px;
}

/* === BRANDING === */
.branding {
    text-align: center;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--calc-border);
}

.branding span {
    font-size: 0.75rem;
    color: var(--text-dimmed);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.branding a {
    color: #6366f1;
    text-decoration: none;
    font-weight: 600;
}

.branding a:hover {
    text-decoration: underline;
}

@media (max-width: 420px) {
    .calculator {
        padding: 20px;
    }

    .result {
        font-size: 2.5rem;
    }

    .btn {
        font-size: 1.25rem;
    }

    .buttons {
        gap: 10px;
    }
}