:root {
    --bg-darker: #242933;
    --bg-dark: #2E3440;
    --bg-panel: #3B4252;
    --bg-accent: #434C5E;
    --fg-main: #ECEFF4;
    --fg-sub: #D8DEE9;
    --green: #A3BE8C;
    --red: #BF616A;
    --yellow: #EBCB8B;
    --blue: #88C0D0;
    --indigo: #4B0082;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-darker);
    color: var(--fg-main);
    overflow: hidden;
    height: 100vh;
}

#app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
#sidebar {
    width: 250px;
    background-color: var(--bg-panel);
    border-right: 2px solid var(--bg-accent);
    display: flex;
    flex-direction: column;
    padding: 20px;
    transition: transform 0.3s ease;
}

#sidebar.hidden {
    transform: translateX(-100%);
    width: 0;
    padding: 0;
    border: none;
}

.sidebar-title {
    color: var(--yellow);
    font-size: 1.2rem;
    text-align: center;
    margin-bottom: 20px;
}

/* Main Container */
#game-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background: radial-gradient(circle at center, #2e3440, #1a1e26);
}

/* Top Bar */
#top-bar {
    height: 70px;
    background-color: var(--bg-panel);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    z-index: 10;
}

#world-hud {
    display: flex;
    gap: 15px;
    background: var(--bg-darker);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--fg-sub);
    border: 1px solid var(--bg-accent);
}

.top-left, .top-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

#hud-stats {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
}

#lbl-fase { color: var(--green); font-weight: 700; font-size: 1.1rem; }
#lbl-diff { color: var(--yellow); font-size: 0.8rem; font-weight: 400; }

/* Sustainability Bar */
#sustainability-container {
    position: absolute;
    bottom: 100px;
    right: 30px;
    width: 250px;
    background: var(--bg-panel);
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    border-left: 5px solid var(--green);
    z-index: 40;
}

.sus-bar-bg {
    height: 8px;
    background: var(--bg-darker);
    border-radius: 4px;
    margin-bottom: 8px;
    overflow: hidden;
}

#sus-progress {
    height: 100%;
    width: 100%;
    background: var(--green);
    transition: width 0.5s ease, background 0.5s ease;
}

#lbl-sus { font-size: 0.9rem; font-weight: 700; }

/* Canvas */
#game-canvas {
    flex: 1;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* Buttons */
button {
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover { transform: translateY(-2px); filter: brightness(1.1); }
button:active { transform: translateY(0); }

.btn-secondary { background-color: #4C566A; color: white; }
.btn-power-off { background-color: var(--green); color: var(--bg-dark); }
.btn-power-on { background-color: var(--red); color: white; }
.btn-danger { background-color: var(--red); color: white; }
.btn-help { background-color: var(--yellow); color: var(--bg-dark); padding: 12px 24px; font-size: 1.1rem; }

/* Overlays & Modals */
.overlay, .modal {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(46, 52, 64, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.hidden { display: none !important; }

.card {
    background: var(--bg-panel);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    border: 3px solid var(--bg-accent);
}

.card h1 { font-size: 3.5rem; margin-bottom: 5px; color: var(--yellow); text-shadow: 0 0 25px rgba(235, 203, 139, 0.4); }
.subtitle { opacity: 0.7; margin-bottom: 40px; font-weight: 400; font-size: 1.2rem; }

.menu-options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.btn-main {
    font-size: 1.25rem;
    padding: 18px;
    background: linear-gradient(135deg, #4c566a, #3b4252);
    color: white;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.menu-download {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--bg-accent);
}

.menu-download p {
    font-size: 0.9rem;
    color: var(--fg-sub);
    margin-bottom: 15px;
    opacity: 0.8;
}

.dl-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.dl-link {
    background-color: var(--bg-darker);
    color: var(--blue);
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 700;
    border: 1px solid var(--blue);
    transition: all 0.2s ease;
}

.dl-link:hover {
    background-color: var(--blue);
    color: var(--bg-dark);
    transform: translateY(-2px);
}

#help-btn-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
}

.modal-content {
    background: var(--bg-panel);
    width: 800px;
    max-height: 85vh;
    border-radius: 20px;
    padding: 35px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 60px rgba(0,0,0,0.6);
    border: 3px solid var(--bg-accent);
}

.victory-card { border-color: var(--green); }
.msg-box { background: var(--bg-darker); padding: 25px; border-radius: 15px; margin: 20px 0; }
.msg-label { color: var(--yellow); font-weight: 700; margin-bottom: 10px; }
#vic-msg { line-height: 1.6; font-size: 1.1rem; }

#help-text {
    background: var(--bg-darker);
    margin: 20px 0;
    padding: 25px;
    border-radius: 12px;
    overflow-y: auto;
    line-height: 1.7;
    color: var(--fg-sub);
    white-space: pre-wrap;
    text-align: left;
}

.btn-success { background-color: var(--green); color: var(--bg-dark); }
#category-selector { display: flex; flex-direction: column; gap: 5px; margin-bottom: 15px; }
.cat-btn { text-align: left; background: var(--bg-accent); font-size: 0.8rem; padding: 8px 12px; }
.cat-btn.active { background: var(--blue); color: var(--bg-dark); }
#item-separator { height: 2px; background: var(--bg-accent); margin: 10px 0; }
.item-btn { margin-bottom: 5px; }
.item-btn.active { outline: 2px solid var(--blue); }