/* ===== CSS VARIABLES ===== */
:root {
    --font-display: 'Libre Baskerville', serif;
    --font-body: 'Lato', sans-serif;
    --color-bg: #f4f4f7;
    --color-card: #ffffff;
    --color-text: #1a1a2e;
    --color-muted: #6b6b7e;
    --color-accent: #2e3f99;
    --color-border: #e0e0ea;
    --color-free: #d4edda;
    --color-personal: #fff3cd;
    --color-pro: #f8d7da;
}

/* ===== RESET & BASE ===== */
* {
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    max-width: 700px;
    margin: 1.5rem auto;
    padding: 1rem;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== CARD ===== */
.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem 1rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

/* ===== TYPOGRAPHY ===== */
h2 {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 1.25rem 0;
    text-align: center;
}

.note {
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: 1.5rem;
    text-align: center;
}

/* ===== PRESET BUTTONS ===== */
.preset-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    justify-content: center;
}

.btn {
    font-family: var(--font-body);
    font-weight: 500;
    border-radius: 8px;
}

.btn-outline-secondary {
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn-outline-secondary:hover {
    background-color: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ===== METER ROWS - MOBILE FIRST ===== */
.meter-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 0.4rem 0.5rem;
    margin-bottom: 1.2rem;
    align-items: center;
}

.meter-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    grid-column: 1;
    grid-row: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.meter-label small {
    font-weight: 400;
    color: var(--color-muted);
    font-size: 0.75rem;
    margin-left: 4px;
}

/* ===== TOOLTIP COMPONENT ===== */
.tooltip-container {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 600;
    cursor: help;
    flex-shrink: 0;
    transition: background-color 0.2s ease;
}

.tooltip-icon:hover {
    background: #1a2970;
}

.tooltip-content {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-text);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    line-height: 1.5;
    word-spacing: 0.05em;
    white-space: normal;
    min-width: 220px;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 1000;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-text);
}

.tooltip-container:hover .tooltip-content {
    opacity: 1;
    visibility: visible;
}

/* Mobile layout: number input and credit hint on top right, slider below */
.meter-row input[type=number] {
    grid-column: 2;
    grid-row: 1;
    width: 80px;
}

.meter-row .credit-hint {
    grid-column: 3;
    grid-row: 1;
}

.meter-row input[type=range] {
    grid-column: 1 / -1;
    grid-row: 2;
}

/* Mobile tooltip adjustment */
.meter-row .tooltip-content {
    font-size: 0.85rem;
}

input[type=range] {
    width: 100%;
    height: 6px;
    border-radius: 20px;
    cursor: pointer;
    -webkit-appearance: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

input[type=range]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

input[type=number] {
    padding: 6px 8px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: var(--font-body);
    text-align: right;
    background: var(--color-card);
}

input[type=number]:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(46, 63, 153, 0.1);
}

.credit-hint {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    min-width: 55px;
    text-align: right;
    white-space: nowrap;
}

/* ===== RESULTS BLOCK ===== */
.results-block {
    background: var(--color-bg);
    border-radius: 12px;
    padding: 1.25rem;
    margin-top: 1.5rem;
    text-align: center;
}

.total-line {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.75rem;
}

.total-line.cost-line {
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
}

.total-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-muted);
}

#totalCredits {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 3vw, 1.4rem);
    font-weight: 600;
    color: var(--color-text);
}

.cost-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-muted);
}

.cost-line #estimatedCost {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 700;
    color: var(--color-accent);
}

/* ===== SEGMENTED PROGRESS BAR ===== */
.seg-bar-wrap {
    position: relative;
    width: 100%;
    height: 20px;
    margin: 1.25rem 0 0.5rem 0;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* Background segments */
.seg {
    position: absolute;
    top: 0;
    height: 100%;
    background: white;
    border-right: 2px solid white;
}

.seg-free {
    left: 0;
    width: 10%;
    background: var(--color-free);
}

.seg-personal {
    left: 10%;
    width: 23.333%;
    background: var(--color-personal);
}

.seg-pro {
    left: 33.333%;
    width: 66.667%;
    background: var(--color-pro);
}

/* Fill bar overlay */
#fillBar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: #2e7d32;
    border-radius: 20px;
    transition: width 0.3s ease, background-color 0.2s ease;
    z-index: 10;
}

/* Segment labels - staggered above and below bar */
.seg-labels {
    position: relative;
    width: 100%;
    height: 50px;
    margin: 0.5rem 0 0 0;
    font-size: 0.75rem;
    color: var(--color-muted);
}

.seg-labels span {
    position: absolute;
    white-space: nowrap;
    font-weight: 500;
}

/* Labels positioned above the threshold area */
.seg-labels .label-top {
    top: 0;
    transform: translateX(-50%);
}

/* Labels positioned below the threshold area */
.seg-labels .label-bottom {
    bottom: 0;
    transform: translateX(-50%);
    position: relative;
}

/* Connector line from bar to below label */
.seg-labels .label-bottom::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 12px;
    background: var(--color-muted);
    opacity: 0.4;
}

/* Special case: 3k label - right-aligned */
.seg-labels span[style*="left: 100%"] {
    transform: translateX(-100%);
}

/* ===== PLAN TAG ===== */
.plan-tag {
    display: inline-block;
    background: white;
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    margin-top: 0.75rem;
}

/* ===== FOOTER ===== */
.calc-footer {
    font-size: 0.75rem;
    color: var(--color-muted);
    margin-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    padding-top: 0.75rem;
    text-align: center;
}

.calc-footer a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.calc-footer a:hover {
    text-decoration: underline;
}

/* ===== DESKTOP LAYOUT (576px+) ===== */
@media (min-width: 576px) {
    body {
        margin: 2rem auto;
        padding: 1rem;
    }

    .card {
        padding: 2rem;
        padding-top: 2.5rem;
    }

    h2 {
        margin-bottom: 1.25rem;
    }

    .note {
        margin-bottom: 2rem;
    }

    .preset-buttons {
        margin-bottom: 2rem;
        gap: 0.75rem;
    }

    /* Desktop: 4-column grid layout */
    .meter-row {
        display: grid;
        grid-template-columns: 155px 1fr 80px 70px;
        gap: 1rem;
        align-items: center;
        margin-bottom: 1.5rem;
    }

    .meter-label {
        grid-column: 1;
        align-self: center;
    }

    input[type=range] {
        grid-column: 2;
    }

    input[type=number] {
        grid-column: 3;
        width: 100%;
    }

    .credit-hint {
        grid-column: 4;
        text-align: right;
    }

    .seg-bar-wrap {
        height: 24px;
        margin: 1.5rem 0 0.75rem 0;
    }

    .seg-labels {
        height: 60px;
        font-size: 0.8rem;
    }

    .results-block {
        padding: 2rem;
        margin-top: 2rem;
    }

    .total-line {
        margin-bottom: 1rem;
    }

    #totalCredits {
        font-size: clamp(1.2rem, 3vw, 1.5rem);
    }

    .cost-line #estimatedCost {
        font-size: clamp(1.6rem, 5vw, 2.2rem);
    }
}