/* -------------------------------
   Global font and body settings
---------------------------------*/
body {
    font-family: Georgia, serif;  /* body text */
    font-size: 16px;
    line-height: 1.5;
    color: #111;                  /* dark text */
    background-color: #fff;       /* light background */
    margin: 0;
    padding: 0;
}

/* -------------------------------
   Home 
---------------------------------*/
.home-content {
    max-width: 600px;
    margin: 60px;
}
@media (max-width: 768px) {
    .home-content {
        margin: 24px 16px;
    }
}
/* =====================================================
   Title
===================================================== */
#page-title {
    font-size: 3rem;
    font-weight: 700;
    margin: 0;
}
/* -------------------------------
   Headings
---------------------------------*/
h1, h2, h3, h4, h5, h6 {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 400;             /* normal weight for elegance */
    margin: 0.5em 0;
}

/* -------------------------------
   Dash Tabs
---------------------------------*/
.tab {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 400;
}

/* -------------------------------
   Buttons
---------------------------------*/
button, .dash-button {
    font-family: Georgia, serif;
    font-weight: 400;
    font-size: 19px;
}


.nav-button {
    background: #ffffff;
    border: none;
    padding: 8px 16px;
    margin: 0 0px;
    cursor: pointer;

    font-family: Georgia, serif;
    font-size: 12px;
    font-weight: 400;
    color: #222;

    border-radius: 6px;

    /* Drop shadow for button identity */
    box-shadow: 0 2px 6px rgba(0,0,0,0.12);

    position: relative;
    transition: all 0.25s ease;
}

/* Hover: underline + raise button slightly */
.nav-button:hover {
    color: #0077ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.18);
}

/* Underline animation */
.nav-button::after {
    content: "";
    position: absolute;
    left: 16px;
    right: 16px;
    bottom: 5px;  /* inside the button */
    height: 2px;
    background-color: #0077ff;
    width: 0%;
    transition: width 0.25s ease;
}

.nav-button:hover::after {
    width: calc(100% - 32px);
}

/* --------------------------
   ACTIVE TAB (distinct color)
---------------------------*/
.nav-button.active {
    background-color: #0077ff;    /* fill */
    color: white;                 /* white text */
    box-shadow: 0 3px 12px rgba(0,0,0,0.22);
    transform: translateY(-1px);
}

/* Underline off for active — not needed */
.nav-button.active::after {
    width: 0;
}

/* ----------------------------------
   BASE BOX STYLE (shared everywhere)
----------------------------------- */
.box {
    background: #fafafa;
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    line-height: 1.6;
}

.selector-box {
    max-width: 600px;
    margin: 0 auto;
    margin-bottom: 4px;
}

@media (max-width: 768px) {
    .selector-box {
        max-width: 100%;
    }
}
/* ----------------------------------
   PLOT BOX
----------------------------------- */
.plot-box {
    padding: 10px 10px 10px 10px;
}

/* ----------------------------------
   TEXT BOX
----------------------------------- */
.text-box h3 {
    margin-top: 0;
    font-weight: 500;
}

.box.highlight {
    background: #f0f7ff;
    border-left: 5px solid #1f77b4;
}

/* ----------------------------------
   FIGURE + TEXT LAYOUT
----------------------------------- */
.figure-row {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
}
.figure-row .plot-box {
    flex: 2;
    min-width: 0;   /* 🔑 REQUIRED for flexbox + plotly */
}
.figure-row .text-box {
    flex: 1;
}

@media (max-width: 768px) {
    .figure-row {
        flex-direction: column;
    }

    .figure-row .plot-box,
    .figure-row .text-box {
        width: 94%;
    }
}
/* ----------------------------------
   GAS INTRO (TOP BOX)
----------------------------------- */
.gas-intro {
    max-width: 1200px;
    margin: 40px auto 30px auto;
}

.gas-intro h2 {
    margin-top: 0;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 600;
}

/* Gas page nav buttons: lower position & centered */
.gas-nav {
    display: flex;
    justify-content: center;  /* centers buttons horizontally */
    margin-top: 40px;         /* pushes buttons downward */
    margin-bottom: 40px;      /* spacing below buttons */
}

.gas-nav #nav-buttons {
    display: flex;
    flex-wrap: wrap;        /* ✅ allows wrapping */
    gap: 12px 14px;                 /* spacing between buttons */
    align-items: center;
}

/* =====================================================
   HERO LAYOUT
===================================================== */
.hero {
    min-height: 100vh;
    padding-top: 180px;
    padding-left: 120px;
    padding-right: 120px;
}
.hero-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;  /* left-align everything */
    gap: 20px;                /* spacing between title, nav buttons, subtitle */
}

.hero-title {
    font-size: 48px;
    font-weight: 600;
    margin: 0;                /* remove extra margin */
}

@media (max-width: 768px) {
    .hero {
        padding-top: 100px;
        padding-left: 16px;
        padding-right: 16px;
    }

    .hero-title {
        font-size: 36px;
    }
}

.hero-header #nav-buttons {
    display: flex;
    flex-wrap: wrap;        /* ✅ allows wrapping */
    gap: 12px 14px;         /* row gap / column gap */
    margin: 0;                /* reasonable spacing between buttons */
    justify-content: flex-start;
}

/* Optional: subtitle spacing */
.hero-subtitle {
    font-size: 22px;
    color: #555;
    margin-left: 0px;
    margin-right: 0px;
    margin-top: 0px;
    margin-bottom: 0px;
}
/* -----------------------------------
   Plot container
----------------------------------- */
#gas-figure {
    background: #ffffff;
    border-radius: 14px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
    padding: 12px;
}

/* -------------------------------
   Flexible Buttons
---------------------------------*/
@media (max-width: 768px) {
    .nav-button {
        padding: 10px 18px;
        font-size: 16px;
    }

    #nav-buttons {
        justify-content: center;   /* center rows on mobile */
    }
}
/* -------------------------------
   Plotly Graph fonts
---------------------------------*/
.js-plotly-plot .gtitle, 
.js-plotly-plot .axistext {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
/* .js-plotly-plot,
.plot-container {
    width: 100% !important;
} */