/* CSS VARIABLES & RESET */
:root {
    --primary: #00d09c;
    /* Groww Green */
    --primary-hover: #00b386;
    --dark: #44475b;
    --gray: #7c7e8c;
    --light-bg: #f3f6f9;
    /* Softer background */
    --white: #ffffff;
    --border: #eef2f5;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    /* Soft shadow */
    --radius: 16px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--light-bg);
    color: var(--dark);
    margin: 0;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.2s;
}

a:hover {
    color: var(--primary);
}

/* LAYOUT */
header {
    background: var(--white);
    padding: 0.5rem 0;
    margin-bottom: 2.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    font-weight: 800;
    font-size: 1.6rem;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.brand span {
    color: var(--dark);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* GRID SYSTEM */
.page-grid {
    display: grid;
    grid-template-columns: 2.2fr 1fr;
    gap: 3rem;
}

/* TOOL CARDS */
.tool-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 2.5rem;
}

/* Inner Calculator Layout */
.calc-inner-grid {
    display: flex;
    gap: 4rem;
    align-items: flex-start;
}

.calc-inputs {
    flex: 1;
    min-width: 300px;
}

.calc-results {
    flex: 0.8;
    min-width: 280px;
}

/* INPUTS & SLIDERS */
.input-group {
    margin-bottom: 2.5rem;
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.2rem;
    font-weight: 600;
    color: var(--dark);
    font-size: 1rem;
}

/* New Input Style: Input looks like text, unit inside */
.input-wrapper {
    background: #f0f3f7;
    border-radius: 8px;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    font-weight: 700;
    color: var(--primary);
    width: 140px;
}

.input-wrapper input {
    background: transparent;
    border: none;
    outline: none;
    text-align: right;
    width: 100%;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    padding: 0 5px;
}

.range-wrapper {
    position: relative;
    height: 6px;
    margin-top: 15px;
    display: flex;
    align-items: center;
}

/* Custom Range Slider */
input[type="range"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: #eef2f5;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    margin: 0;
    padding: 0;
    /* We will use a linear-gradient in JS to fill the progress */
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 24px;
    width: 24px;
    background: var(--white);
    border: 4px solid var(--primary);
    border-radius: 50%;
    cursor: grab;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    margin-top: 0px;
    /* Center relative to track height (4px) */
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* RESULTS SECTION */
.calc-results {
    text-align: center;
}

.result-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: var(--gray);
}

.result-row strong {
    color: var(--dark);
    font-size: 1.1rem;
}

.total-value-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background: #ecfdf5;
    /* Light green tint */
    border-radius: 12px;
    border: 1px solid #d1fae5;
}

.total-value-label {
    font-size: 0.9rem;
    color: var(--gray);
    display: block;
    margin-bottom: 0.5rem;
}

.total-value-amount {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

/* SIDEBAR & ARTICLE */
h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

h3 {
    font-size: 1.2rem;
    color: var(--dark);
}

p,
li {
    color: var(--gray);
    font-size: 1.05rem;
}

.sidebar-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.sidebar-title {
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1rem;
}

.sidebar-link {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    color: var(--dark);
    font-weight: 500;
}

.sidebar-link:hover {
    color: var(--primary);
    padding-left: 5px;
}

.sidebar-link:last-child {
    border: none;
}

footer {
    border-top: 1px solid var(--border);
    margin-top: 4rem;
    padding: 3rem 0;
    text-align: center;
    color: var(--gray);
    background: var(--white);
}

/* RESPONSIVE */
.btn-primary {
    background: var(--primary);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0, 208, 156, 0.3);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--dark);
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(68, 71, 91, 0.2);
}

.btn-secondary:hover {
    background: #363849;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--dark);
    border-radius: 8px;
    padding: 12px 20px;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    transition: 0.2s;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-group {
    display: flex;
    gap: 10px;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

/* TEXTAREA STYLING - for encoders/formatters */
.textarea-wrapper {
    width: 100%;
    margin-bottom: 1rem;
}

.textarea-wrapper label {
    display: block;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.textarea-wrapper textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--white);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.95rem;
    color: var(--dark);
    resize: vertical;
    min-height: 140px;
    line-height: 1.5;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.textarea-wrapper textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 208, 156, 0.15);
}

.textarea-wrapper textarea[readonly] {
    background: #f8fafc;
    cursor: default;
}

.textarea-wrapper textarea::placeholder {
    color: var(--gray);
}

/* SELECT STYLING - for converters */
.select-wrapper {
    width: 100%;
    margin-top: 8px;
}

.select-wrapper select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--white);
    font-size: 1rem;
    font-weight: 500;
    color: var(--dark);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237c7e8c' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}

.select-wrapper select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 208, 156, 0.15);
}

/* CONVERTER INPUT - number inputs for converters */
.converter-input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.converter-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 208, 156, 0.15);
}

.converter-input[readonly] {
    background: #f8fafc;
    cursor: default;
}

/* CONVERTER GRID LAYOUT */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.converter-col label {
    display: block;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

/* FORMULA BOX */
.formula-box {
    background: #f1f5f9;
    padding: 16px 20px;
    border-radius: 10px;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.95rem;
    margin: 1rem 0;
    border: 1px solid var(--border);
    overflow-x: auto;
}

.formula-box.warning {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

/* RESULT DISPLAY BOX */
.result-box {
    background: #ecfdf5;
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid #d1fae5;
    margin-top: 1.5rem;
}

.result-box .result-label {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 0.3rem;
}

.result-box .result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

/* FAQ SECTION */
.faq-section {
    margin-top: 2rem;
}

.faq-section h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
    .page-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .calc-inner-grid {
        flex-direction: column;
        gap: 3rem;
    }

    .calc-results {
        width: 100%;
    }

    .converter-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    h1 {
        font-size: 1.8rem;
    }
}