/* ========================================
   IMPORT & VARIABILI
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700;900&family=Inter:wght@300;400;500;600&display=swap');

:root {
    --bg-color: #070707;
    --text-color: #FCF7F8;
    --accent-color: #961114;
    --accent-dim: rgba(150, 17, 20, 0.18);
    --accent-glow: rgba(150, 17, 20, 0.35);
    --secondary-bg: #111111;
    --card-bg: #1a1a1a;
    --border-color: rgba(252, 247, 248, 0.07);
    --border-hover: rgba(252, 247, 248, 0.18);
    --nav-height: 70px;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body.light-theme {
    --bg-color: #FCF7F8;
    --text-color: #070707;
    --secondary-bg: #eaeaea;
    --card-bg: rgba(224, 224, 224, 0.85);
    --border-color: rgba(7, 7, 7, 0.08);
    --border-hover: rgba(7, 7, 7, 0.2);
    --accent-dim: rgba(150, 17, 20, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow: hidden; /* nessun scroll, tutto canvas */
    transition: background-color 0.5s cubic-bezier(0.4,0,0.2,1),
                color 0.5s cubic-bezier(0.4,0,0.2,1);
}

/* ========================================
   NAVBAR
   ======================================== */

.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background-color: rgba(7, 7, 7, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.5s cubic-bezier(0.4,0,0.2,1);
}
body.light-theme .navbar { background-color: rgba(252, 247, 248, 0.7); }

.navbar-container {
    height: var(--nav-height);
    padding: 0 2rem;
    display: flex; justify-content: space-between; align-items: center;
    max-width: 1800px; margin: 0 auto;
}
.navbar-logo { display: flex; align-items: center; gap: 0.75rem; }
.logo-icon { width: auto; height: 40px; flex-shrink: 0; }
.logo-text { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em; }
.navbar-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-link { color: var(--text-color); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
.nav-link:hover { color: var(--accent-color); }

.theme-toggle {
    background: none; border: 1px solid var(--border-color); border-radius: 50%;
    width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--text-color); transition: all 0.2s; position: relative;
}
.theme-toggle:hover { border-color: var(--accent-color); transform: rotate(180deg); }
.sun-icon, .moon-icon { position: absolute; transition: opacity 0.2s, transform 0.2s; }
.sun-icon { opacity: 0; transform: rotate(-90deg); }
.moon-icon { opacity: 1; transform: rotate(0); }
body.light-theme .sun-icon { opacity: 1; transform: rotate(0); }
body.light-theme .moon-icon { opacity: 0; transform: rotate(90deg); }

/* ========================================
   CANVAS
   ======================================== */

#particleCanvas {
    position: fixed;
    top: 0; left: 0;
    width: 100vw;
    height: 100vh;
    display: block;
    z-index: 1;
}

/* ========================================
   PANNELLO CONTROLLI
   ======================================== */

.controls-panel {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 200;
    width: 260px;
    background: rgba(14, 14, 14, 0.78);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    overflow: hidden;
    transition: width 0.3s cubic-bezier(0.4,0,0.2,1);
    box-shadow: 0 8px 40px rgba(0,0,0,0.4);
}
body.light-theme .controls-panel {
    background: rgba(235, 235, 235, 0.82);
    box-shadow: 0 8px 40px rgba(0,0,0,0.12);
}

/* Header – sempre visibile */
.controls-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 0.9rem;
    cursor: pointer;
    user-select: none;
}

.controls-title {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    opacity: 0.5;
}

.controls-minimize {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-color);
    width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.18s;
    opacity: 0.5;
}
.controls-minimize:hover { opacity: 1; border-color: var(--accent-color); color: var(--accent-color); }

/* Body – collapsibile */
.controls-body {
    padding: 0 0.9rem 0.9rem;
    overflow: hidden;
    max-height: 400px;
    transition: max-height 0.35s cubic-bezier(0.4,0,0.2,1), padding 0.35s cubic-bezier(0.4,0,0.2,1);
}
.controls-panel.minimized .controls-body {
    max-height: 0;
    padding-bottom: 0;
}
/* Ruota l'icona minimize quando collapsed */
.controls-panel.minimized .controls-minimize {
    transform: rotate(180deg);
}

/* Singolo controllo */
.ctrl-row {
    margin-bottom: 0.75rem;
}

.ctrl-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.7rem;
    font-weight: 500;
    opacity: 0.6;
    margin-bottom: 0.35rem;
    letter-spacing: 0.02em;
}

.ctrl-value {
    font-weight: 700;
    color: var(--accent-color);
    opacity: 1;
    font-variant-numeric: tabular-nums;
}

/* Slider custom */
.ctrl-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color);
    outline: none;
    cursor: pointer;
    transition: background 0.2s;
}
.ctrl-slider:hover { background: var(--border-hover); }

.ctrl-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
    transition: transform 0.15s, box-shadow 0.15s;
}
.ctrl-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 14px var(--accent-glow);
}

.ctrl-slider::-moz-range-thumb {
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    border: none;
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Toggle group */
.ctrl-toggle-group {
    display: flex;
    gap: 0.3rem;
    margin-top: 0.4rem;
}

.ctrl-toggle {
    flex: 1;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.3rem;
    cursor: pointer;
    transition: all 0.18s;
    text-align: center;
}
.ctrl-toggle:hover { border-color: var(--border-hover); }
.ctrl-toggle.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

/* Azioni */
.ctrl-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.9rem;
    padding-top: 0.7rem;
    border-top: 1px solid var(--border-color);
}

.ctrl-btn {
    flex: 1;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border-color);
    border-radius: 7px;
    color: var(--text-color);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.45rem 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    transition: all 0.18s;
}
.ctrl-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: var(--accent-dim);
}

/* ========================================
   HINT
   ======================================== */

.hint {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 200;
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--text-color);
    opacity: 0.3;
    letter-spacing: 0.06em;
    pointer-events: none;
    animation: hintPulse 3s ease-in-out infinite;
}

@keyframes hintPulse {
    0%, 100% { opacity: 0.3; }
    50%      { opacity: 0.55; }
}

/* Svanisce dopo 4s */
.hint.hidden { opacity: 0 !important; transition: opacity 1s; animation: none; }

/* ========================================
   ACCESSIBILITÀ
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    .hint { animation: none; }
    .controls-body, .controls-minimize { transition: none !important; }
}

button:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; }
::selection { background: var(--accent-color); color: #fff; }