/* =========================
   COLORS
========================= */
:root {
    --river-dark: #142c36;
    --river-mid: #24556a;
    --river-light: #5c9fb0;
    --paper: #efe4c9;
    --paper-dark: #d6c39c;
    --gold: #d9ad54;
    --stone-size: 82px;
}


/* =========================
   COLORS
========================= */

.hidden {
    display: none !important;
}


/* =========================
   PAGE LAYOUT
========================= */

html,
body {
    margin: 0;
    min-height: 100vh;
    width: 100vw;
}

body {
    font-family: "Segoe UI", Arial, sans-serif;
    user-select: none;
    color: #eaf4f5;
    background: radial-gradient( circle at 20% 20%, rgba(60, 130, 145, 0.35), transparent 30% ), radial-gradient( circle at 80% 70%, rgba(25, 90, 110, 0.45), transparent 35% ), linear-gradient( 135deg, #0b1820, #102b36 45%, #081216 );
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

* {
    box-sizing: border-box;
}

.river-page {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5em 1em;
    position: relative;
    flex-direction: column;
    flex-grow: 1
}


    /* Subtle river-like flowing bands */

    .river-page::before,
    .river-page::after {
        content: "";
        position: fixed;
        width: 140%;
        height: 180px;
        left: -20%;
        border-radius: 50%;
        pointer-events: none;
        transform: rotate(-8deg);
    }

    .river-page::before {
        top: 18%;
        background: linear-gradient( 90deg, transparent, rgba(45, 120, 145, 0.12), rgba(90, 180, 190, 0.18), transparent );
    }

    .river-page::after {
        bottom: 12%;
        background: linear-gradient( 90deg, transparent, rgba(20, 80, 110, 0.1), rgba(70, 150, 170, 0.15), transparent );
    }


/* =========================
   NAVIGATION
========================= */
.top-nav {
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    background: rgba(10, 25, 30, 0.75);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}


.nav-button {
    width: 42px;
    height: 42px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 10px;
}

    .nav-button span {
        display: block;
        width: 100%;
        height: 2px;
        background: white;
        border-radius: 5px;
    }


.home-button {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 22px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    transition: transform 0.15s ease, background 0.15s ease;
}

    .home-button:hover {
        background: rgba(255, 255, 255, 0.15);
        transform: scale(1.05);
    }


/* =========================
   SIDE MENU
========================= */

.side-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: min(320px, 82vw);
    height: 100vh;
    z-index: 1000;
    background: linear-gradient( 180deg, #1e3d48, #10252d );
    transform: translateX(-100%);
    transition: transform 0.25s ease;
}


    .side-menu.open {
        transform: translateX(0);
    }


.side-menu-header {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

    .side-menu-header h2 {
        margin: 0;
    }


.close-menu-button {
    border: none;
    background: transparent;
    color: white;
    font-size: 30px;
    cursor: pointer;
}


.menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}


    .menu-overlay.visible {
        opacity: 1;
        visibility: visible;
    }