/* ===== ریست ===== */
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}

/* ===== متغیرها ===== */
:root{
    --bg:#F2F2F7;
    --card:#FFFFFF;
    --text:#1C1C1E;
    --text2:#8E8E93;
    --text3:#AEAEB2;
    --border:#E5E5EA;
    --accent:#007AFF;
    --accent-bg:rgba(0,122,255,0.08);
    --shadow:0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg:0 8px 32px rgba(0,0,0,0.12);
    --font:'Vazirmatn',-apple-system,sans-serif;
    --img-ratio:2683/2115;
    --radius:14px;
    --radius-lg:20px;
}

html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;overflow-x:hidden;min-height:100vh}

/* ===== محفظه ===== */
.wrap{max-width:520px;margin:0 auto;padding:10px}

/* ===== هدر ===== */
.header{display:flex;justify-content:space-between;align-items:center;padding:8px 0 10px}
.header h1{font-size:15px;font-weight:700; color: white;}
.header-btns{display:flex;gap:6px}

.icon-btn{width:32px;height:32px;border:1px solid var(--border);border-radius:50%;background:var(--card);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text2);transition:all .15s;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.icon-btn:hover{background:var(--border);color:var(--text)}
.icon-btn:active{transform:scale(.88)}

/* ===== لایوت ===== */
.layout{width:100%}
.col-image{width:100%}

/* ===== کارت تصویر ===== */
.card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}

.img-box{position:relative;width:100%;aspect-ratio:var(--img-ratio);overflow:hidden;background:linear-gradient(135deg,#E8E0D8,#C0B4A8)}
.img-box img{display:block;width:100%;height:100%;object-fit:cover}
.img-box svg{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;mix-blend-mode:multiply;z-index:2}

/* ===== نوار کد رنگ ===== */
.color-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-top:1px solid #f0f0f0}
.swatch{width:22px;height:22px;border-radius:6px;border:1.5px solid var(--border);flex-shrink:0;transition:background .15s}
.hex{font-size:12px;font-weight:600;font-family:'SF Mono',monospace;color:var(--text);letter-spacing:.5px}
.hsl-text{font-size:10px;color:var(--text3);font-family:monospace;flex:1;text-align:left;direction:ltr}
.copy-btn{padding:4px 12px;border:1px solid var(--border);border-radius:6px;background:var(--card);cursor:pointer;font-family:var(--font);font-size:10px;font-weight:600;color:var(--text2);transition:all .15s}
.copy-btn:active{transform:scale(.9);background:var(--accent);color:#fff;border-color:var(--accent)}

/* ===== کارت کنترل‌ها (تب‌بار + محتوا) ===== */
.col-controls{width:100%;margin-top:10px}

.controls-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}

/* تب‌بار */
.tab-bar{display:flex;border-bottom:1px solid var(--border);background:#F8F8FA}
.tab-btn{flex:1;padding:10px 4px;border:none;background:transparent;font-family:var(--font);font-size:11px;font-weight:600;color:var(--text2);cursor:pointer;transition:all .25s;position:relative;white-space:nowrap;-webkit-user-select:none;user-select:none}
.tab-btn::after{content:'';position:absolute;bottom:0;left:15%;right:15%;height:2.5px;background:var(--accent);border-radius:2px 2px 0 0;transform:scaleX(0);transition:transform .3s}
.tab-btn.active{color:var(--accent);background:var(--card)}
.tab-btn.active::after{transform:scaleX(1)}
.tab-btn:hover:not(.active){color:var(--text);background:rgba(0,0,0,.02)}
.tab-btn:active{transform:scale(.95)}

/* محتوای تب */
.tab-panel{display:none;padding:14px 14px 16px}
.tab-panel.active{display:block}

/* ===== اسلایدرها ===== */
.slider-group{margin-bottom:14px}
.slider-label{display:flex;justify-content:space-between;margin-bottom:4px}
.slider-label span{font-size:11px;font-weight:600}
.slider-label em{font-size:10px;font-style:normal;color:var(--text2);font-family:monospace}

input[type=range]{-webkit-appearance:none;width:100%;height:5px;border-radius:3px;outline:none;cursor:pointer;direction:ltr;transition:height .15s;-webkit-user-select:none;user-select:none}
input[type=range]:hover{height:7px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:#fff;border:2px solid var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.18);cursor:pointer;transition:transform .15s,box-shadow .15s}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15);box-shadow:0 2px 8px rgba(0,122,255,.3)}
input[type=range]:active::-webkit-slider-thumb{transform:scale(1.25);box-shadow:0 0 0 4px rgba(0,122,255,.15)}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:2px solid var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.18);cursor:pointer}
input[type=range]::-moz-range-track{height:5px;border-radius:3px;border:none}
.hue-bg{background:linear-gradient(to right,hsl(0,100%,50%),hsl(60,100%,50%),hsl(120,100%,50%),hsl(180,100%,50%),hsl(240,100%,50%),hsl(300,100%,50%),hsl(360,100%,50%))}

/* ===== ترکیب ===== */
.blend-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.blend-btn{display:flex;flex-direction:column;align-items:center;gap:5px;padding:10px 4px;border:1.5px solid var(--border);border-radius:10px;background:var(--card);cursor:pointer;font-family:var(--font);transition:all .25s;-webkit-user-select:none;user-select:none}
.blend-btn:hover{border-color:var(--text3);transform:translateY(-1px);box-shadow:0 1px 3px rgba(0,0,0,.06)}
.blend-btn:active{transform:scale(.94)}
.blend-btn.active{border-color:var(--accent);background:var(--accent-bg)}
.chip{width:28px;height:28px;border-radius:6px}
.blend-btn span{font-size:9px;font-weight:600;color:var(--text2)}
.blend-btn.active span{color:var(--accent)}

/* ===== پیشنهادی ===== */
.preset-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.preset-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 2px 6px;border:1.5px solid var(--border);border-radius:10px;background:var(--card);cursor:pointer;font-family:var(--font);transition:all .25s;-webkit-user-select:none;user-select:none}
.preset-item:hover{border-color:var(--text3);transform:translateY(-2px);box-shadow:var(--shadow)}
.preset-item:active{transform:scale(.9)}
.preset-item.chosen{border-color:var(--accent);background:var(--accent-bg)}
.preset-dot{width:26px;height:26px;border-radius:50%;border:1px solid rgba(0,0,0,.06);transition:transform .15s}
.preset-item:hover .preset-dot{transform:scale(1.15)}
.preset-item small{font-size:8px;font-weight:600;color:var(--text2);white-space:nowrap}

/* ===== تصاویر نمونه (زیر تب‌ها) ===== */
.image-samples {
    display: flex;
    gap: 8px;
    padding: 0 14px 16px;      /* فاصله از لبه‌ها و پایین */
}

.sample-link {
    flex: 1;                  /* هر لینک به یک اندازه */
    display: block;
    border-radius: 10px;
    overflow: hidden;
    border: 2px solid var(--border);
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    aspect-ratio: 1 / 1;      /* مربع */
}

.sample-link:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.sample-link img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;         /* تصویر بدون کش‌آمدن نادرست مربع را پر کند */
}

/* ================================================================
   پنل راهنما (کشویی از پایین)
   ================================================================ */
.help-overlay{position:fixed;inset:0;background:#000;z-index:200;opacity:0;pointer-events:none;transition:opacity .3s}
.help-overlay.show{opacity:.6;pointer-events:auto}

.help-panel{position:fixed;bottom:0;left:0;right:0;max-width:520px;margin:0 auto;background:var(--card);border-radius:var(--radius-lg) var(--radius-lg) 0 0;z-index:210;transform:translateY(100%);transition:transform .35s cubic-bezier(.32,.72,0,1);max-height:80vh;display:flex;flex-direction:column;box-shadow:0 -4px 30px rgba(0,0,0,.15);touch-action:none}
.help-panel.open{transform:translateY(0)}
.help-panel.dragging{transition:none}

.help-handle{display:flex;justify-content:center;padding:10px 0 4px;cursor:grab}
.help-handle div{width:36px;height:4px;background:#D1D1D6;border-radius:2px;transition:width .15s}
.help-handle:hover div{width:44px;background:#B0B0B5}

.help-title{padding:0 18px 10px;font-size:15px;font-weight:700;color:var(--text)}
.help-body{padding:0 18px 24px;overflow-y:auto;flex:1;-webkit-overflow-scrolling:touch}
.help-body::-webkit-scrollbar{width:2px}
.help-body::-webkit-scrollbar-thumb{background:#D1D1D6;border-radius:1px}

.help-section{margin-bottom:18px}
.help-section h4{font-size:13px;font-weight:700;margin-bottom:8px;color:var(--text)}
.help-section .desc{font-size:11px;color:var(--text2);line-height:1.9}

.steps{display:flex;flex-direction:column;gap:8px}
.step{display:flex;gap:8px;align-items:flex-start}
.badge{width:20px;height:20px;min-width:20px;border-radius:50%;background:var(--accent);color:#fff;font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.step p{font-size:11px;color:var(--text2);line-height:1.7}
.step p b{color:var(--text)}

.blend-info{display:flex;flex-direction:column;gap:6px}
.blend-info div{font-size:11px;color:var(--text2);line-height:1.6;padding:6px 10px;background:#F8F8FA;border-radius:8px}
.blend-info div b{color:var(--text);font-weight:600}

/* ===== ریسپانسیو موبایل کوچک ===== */
@media(max-width:359px){
    .preset-grid{grid-template-columns:repeat(3,1fr)}
    .tab-btn{font-size:10px;padding:8px 2px}
    .hsl-text{display:none}
    /* در صورت نیاز برای تصاویر نمونه */
    .image-samples {
        flex-wrap: wrap;
    }
    .sample-link {
        flex: 1 1 30%;
    }
}

/* ================================================================
   دسکتاپ ≥992px
   ================================================================ */
@media(min-width:992px){
    body{background:transparent}
    .wrap{max-width:1100px;padding:10px 24px}
    .header h1{font-size:18px;font-weight:800}

    /* دوستونه */
    .layout{display:flex;flex-direction:row-reverse;gap:24px;align-items:flex-start}
    .col-image{flex:1;min-width:0}

    .card{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}

    .color-bar{padding:10px 18px;gap:12px}
    .swatch{width:24px;height:24px}
    .hex{font-size:14px}
    .hsl-text{font-size:11px}

    /* سایدبار */
    .col-controls{width:340px;min-width:300px;flex-shrink:0;position:sticky;top:20px;margin-top:0}
    .controls-card{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}

    .tab-panel{padding:16px 18px 20px}

    .col-controls .slider-group{margin-bottom:16px}
    .col-controls .slider-label span{font-size:12px}
    .col-controls .slider-label em{font-size:11px}
    .col-controls input[type=range]{height:6px}
    .col-controls input[type=range]:hover{height:8px}
    .col-controls input[type=range]::-webkit-slider-thumb{width:18px;height:18px}

    .col-controls .blend-grid{gap:10px}
    .col-controls .blend-btn{padding:12px 6px}
    .col-controls .chip{width:32px;height:32px}
    .col-controls .blend-btn span{font-size:10px}

    .col-controls .preset-grid{grid-template-columns:repeat(3,1fr);gap:10px}
    .col-controls .preset-dot{width:30px;height:30px}
    .col-controls .preset-item{padding:10px 4px 8px}
    .col-controls .preset-item small{font-size:9px}

    /* تصاویر نمونه در دسکتاپ */
    .image-samples {
        padding: 0 18px 20px;
    }

    /* پنل راهنما در دسکتاپ */
    .help-panel{max-width:600px}
}

@media(min-width:1400px){
    .wrap{max-width:1280px}
    .col-controls{width:380px;min-width:340px}
    .col-controls .preset-grid{grid-template-columns:repeat(4,1fr)}
}

@media(min-width:768px)and(max-width:991px){
    body{background:#E8E8ED}
    .wrap{max-width:680px}
    .card{border-radius:var(--radius-lg)}
    .help-panel{max-width:600px}
}

/* ===== فوتر ===== */
.site-footer {
    text-align: center;
    padding: 16px 10px 8px;
    font-size: 11px;
    color: var(--text2);
    border-top: 1px solid var(--border);
    margin-top: 20px;
}

.site-footer p {
    margin: 0;
    opacity: 0.8;
}

@media(min-width:992px){
    .site-footer {
        font-size: 12px;
        padding: 20px 10px 12px;
    }
}