@import url('https://fonts.googleapis.com/css2?family=Lato:wght@300;400;700;900&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Lato", sans-serif !important;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #2b6cb0, #1a365d);
    color: #f5f9ff;
    overflow-x: hidden;
}

/* =========================
   BACKGROUND GLOW
========================= */

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top,
            rgba(255,255,255,0.12),
            transparent 60%);
    pointer-events: none;
    z-index: -1;
}

/* =========================
   WELCOME SCREEN
========================= */

#welcome-screen {
    position: fixed;
    inset: 0;

    display: flex;
    justify-content: center;
    align-items: center;

    transition:
        opacity 1.2s ease,
        visibility 1.2s ease;

    z-index: 100;
}

#welcome-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.welcome-card {
    padding: 45px;
    border-radius: 20px;

    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(18px);

    border: 1px solid rgba(255,255,255,0.25);

    text-align: center;

    transition:
        transform 1.2s ease,
        opacity 1.2s ease;

    box-shadow:
        0 20px 50px rgba(0,0,0,.25);
}

#welcome-screen.hidden .welcome-card {
    transform: scale(.95);
    opacity: 0;
}

.welcome-card h1 {
    font-size: 2.8rem;
    font-weight: 300;
    margin-bottom: 10px;
}

.welcome-card p {
    opacity: .9;
    font-size: 1.1rem;
}

#start-button {
    margin-top: 25px;

    padding: 13px 28px;

    border: none;
    border-radius: 14px;

    background: #63b3ed;
    color: #0b1b2b;

    font-size: 1rem;
    font-weight: 800;

    cursor: pointer;

    transition: all .25s ease;
}

#start-button:hover {
    transform: translateY(-3px);
    background: #8fd2ff;
}

#start-button:active {
    transform: scale(.97);
}

/* =========================
   MAIN APP
========================= */

.hidden {
    display: none;
}

#app {

    width: min(1000px,92%);
    margin: auto;

    padding: 30px 0;

    opacity: 0;
    transform: translateY(20px);

    transition:
        opacity 1.2s ease,
        transform 1.2s ease;
}

#app.show {
    opacity: 1;
    transform: translateY(0);
}

/* =========================
   HEADER
========================= */

header {
    text-align: center;
    margin-bottom: 25px;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 300;
}

/* =========================
   SOUNDSCAPE BUTTONS
========================= */

#soundscape-selector {

    margin-top: 18px;

    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.soundscape {

    padding: 11px 18px;

    border-radius: 12px;

    border: 1px solid rgba(255,255,255,.20);

    background: rgba(255,255,255,.10);

    color: #eef8ff;

    cursor: pointer;

    transition: all .25s ease;
}

.soundscape:hover {

    transform: translateY(-2px);

    background: rgba(255,255,255,.18);
}

.soundscape.active {

    background: #63b3ed;

    color: #0b1b2b;

    font-weight: 700;
}/* =========================
   TOP CONTROLS
========================= */

#controls {

    margin-top: 18px;

    display: flex;
    justify-content: center;
    gap: 12px;
}

#controls button {

    padding: 10px 18px;

    border: none;
    border-radius: 12px;

    background: rgba(255,255,255,.12);

    color: white;

    font-weight: 700;

    cursor: pointer;

    transition: .25s;
}

#controls button:hover {

    transform: translateY(-2px);

    background: rgba(255,255,255,.20);
}

/* =========================
   SOUND GROUPS
========================= */

#sound-container {

    margin-top: 25px;

    display: flex;
    flex-direction: column;
    gap: 18px;
}

.group {

    padding: 18px;

    border-radius: 16px;

    background: rgba(255,255,255,.10);

    border: 1px solid rgba(255,255,255,.18);

    backdrop-filter: blur(15px);

    box-shadow:
        0 10px 30px rgba(0,0,0,.12);
}

.group h2 {

    margin-bottom: 14px;

    font-weight: 400;
}

/* =========================
   SOUND BUTTONS
========================= */

.sound-btn {

    margin: 5px;

    padding: 10px 15px;

    border: none;
    border-radius: 12px;

    background: rgba(255,255,255,.12);

    color: white;

    cursor: pointer;

    font-weight: 600;

    transition: all .2s ease;
}

.sound-btn:hover {

    transform: translateY(-2px);

    background: rgba(255,255,255,.20);
}

.sound-btn.active {

    background: #63b3ed;

    color: #0b1b2b;

    font-weight: 700;
}

/* =========================
   SCROLLBAR
========================= */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(255,255,255,.08);
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,.28);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,.42);
}

/* =========================
   MOBILE
========================= */

@media (max-width: 700px) {

    .welcome-card {
        width: 92%;
        padding: 35px 25px;
    }

    .welcome-card h1 {
        font-size: 2.2rem;
    }

    header h1 {
        font-size: 1.8rem;
    }

    #controls {
        flex-wrap: wrap;
    }

    .sound-btn {
        width: 100%;
        margin: 6px 0;
    }
}