/* ========================================
   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;
    --secondary-bg: #141414;
    --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;
    --transition-theme: background-color 0.5s cubic-bezier(0.4,0,0.2,1),
                        color 0.5s cubic-bezier(0.4,0,0.2,1);
}

body.light-theme {
    --bg-color: #FCF7F8;
    --text-color: #070707;
    --secondary-bg: #eee;
    --card-bg: #e4e4e4;
    --border-color: rgba(7,7,7,0.08);
    --border-hover: rgba(7,7,7,0.2);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition-theme);
    min-height: 100vh;
    overflow-x: hidden;
}

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

.navbar {
    position: fixed; top:0; left:0; right:0; z-index:1000;
    background-color: rgba(7,7,7,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-theme);
}
body.light-theme .navbar { background-color: rgba(252,247,248,0.85); }

.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); }

/* ========================================
   LAYOUT PRINCIPALE
   ======================================== */

.picker-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    max-width: 880px;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 2.5rem) 2rem 3rem;
    align-items: start;
}

/* ========================================
   COLONNA SINISTRA
   ======================================== */

/* Canvas Saturation / Brightness */
.canvas-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    cursor: crosshair;
}

#canvasSB {
    width: 100%;
    height: 100%;
    display: block;
}

.picker-thumb {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2.5px solid #fff;
    box-shadow: 0 0 0 1.5px rgba(0,0,0,0.4), 0 2px 8px rgba(0,0,0,0.3);
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: none;
    top: 0; left: 0;
}

/* Slider generici */
.slider-group {
    margin-top: 1.2rem;
}

.slider-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    opacity: 0.45;
    margin-bottom: 0.5rem;
}

.slider-track {
    position: relative;
    width: 100%;
    height: 22px;
    border-radius: 11px;
    overflow: hidden;
    cursor: pointer;
    border: 1px solid var(--border-color);
}

.slider-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.slider-thumb {
    position: absolute;
    top: 50%;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2.5px solid #fff;
    box-shadow: 0 0 0 1.5px rgba(0,0,0,0.35), 0 2px 6px rgba(0,0,0,0.25);
    transform: translate(-50%, -50%);
    pointer-events: none;
    left: 0;
}

/* Preview bar (vecchio / nuovo) */
.preview-bar {
    display: flex;
    margin-top: 1.4rem;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    height: 52px;
}

.preview-block {
    flex: 1;
    transition: background-color 0.2s;
}

/* ========================================
   COLONNA DESTRA
   ======================================== */

/* Blocco colore grande */
.color-display {
    width: 100%;
    aspect-ratio: 1.6;
    border-radius: 14px;
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    padding: 1.2rem 1.4rem;
    border: 1px solid var(--border-color);
    transition: background-color 0.15s;
    position: relative;
    overflow: hidden;
}

/* overlay sfumato sotto il testo per leggibilità */
.color-display::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.45) 0%, transparent 55%);
    pointer-events: none;
}

.color-display-hex {
    position: relative;
    z-index: 1;
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    text-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

/* Output formati */
.output-section {
    margin-top: 1.6rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.output-row {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.55rem 0.75rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s;
}
.output-row:hover { border-color: var(--border-hover); }

.output-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.4;
    min-width: 38px;
}

.output-value {
    font-size: 0.78rem;
    font-weight: 500;
    flex: 1;
    font-variant-numeric: tabular-nums;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.18s;
    flex-shrink: 0;
}
.copy-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: color-mix(in srgb, var(--accent-color) 8%, var(--card-bg));
}

/* Input HEX manuale */
.input-section { margin-top: 1.4rem; }

.hex-input-wrap {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: border-color 0.2s;
}
.hex-input-wrap:focus-within { border-color: var(--accent-color); }

.hex-prefix {
    padding: 0.55rem 0.5rem 0.55rem 0.75rem;
    font-size: 0.82rem;
    font-weight: 600;
    opacity: 0.4;
}

.hex-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-color);
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.55rem 0.75rem 0.55rem 0;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.hex-input::placeholder { opacity: 0.3; }

/* Storico colori */
.history-section { margin-top: 1.4rem; }

.history-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    min-height: 28px;
}

.swatch {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    border: 1.5px solid var(--border-color);
    cursor: pointer;
    transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
    flex-shrink: 0;
}
.swatch:hover {
    transform: scale(1.18);
    border-color: var(--border-hover);
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

/* Palette generata */
.palette-section { margin-top: 1.4rem; }

.palette-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.6rem;
}

.palette-modes {
    display: flex;
    gap: 0.3rem;
}

.palette-mode {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.3rem 0.5rem;
    cursor: pointer;
    transition: all 0.18s;
}
.palette-mode:hover { border-color: var(--border-hover); }
.palette-mode.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}

.palette-swatches {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.palette-swatch {
    flex: 1;
    min-width: 48px;
    height: 52px;
    border-radius: 9px;
    border: 1.5px solid var(--border-color);
    cursor: pointer;
    transition: transform 0.18s, box-shadow 0.18s;
    position: relative;
}
.palette-swatch:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}

/* Etichetta hex sotto ogni swatch palette */
.palette-swatch::after {
    content: attr(data-hex);
    position: absolute;
    bottom: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.58rem;
    font-weight: 600;
    opacity: 0.5;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

/* ========================================
   TOAST
   ======================================== */

.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(120%);
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.55rem 1.2rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    z-index: 2000;
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), opacity 0.25s;
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(10px);
}
.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 720px) {
    .picker-layout {
        grid-template-columns: 1fr;
        gap: 1.8rem;
        padding-top: calc(var(--nav-height) + 1.5rem);
        padding-left: 1.2rem;
        padding-right: 1.2rem;
    }
}

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

@media (prefers-reduced-motion: reduce) {
    *, .toast, .swatch, .palette-swatch { transition: none !important; }
}

button:focus-visible,
input:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; }

::selection { background: var(--accent-color); color: var(--bg-color); }