/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#F4F6FA;--surface:#FFFFFF;--surface-hover:#F8F9FC;
  --border:#E2E8F0;--border-focus:#7C5CFC;
  --text:#1A1D26;--text-secondary:#64748B;--text-muted:#94A3B8;
  --primary:#7C5CFC;--primary-light:#EDE9FE;--primary-dark:#5B3FD9;
  --accent:#F59E0B;--accent-light:#FEF3C7;
  --success:#10B981;--success-light:#D1FAE5;
  --danger:#EF4444;
  --gradient:linear-gradient(135deg,#7C5CFC 0%,#A78BFA 50%,#C084FC 100%);
  --shadow-sm:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md:0 4px 12px rgba(0,0,0,.07),0 2px 4px rgba(0,0,0,.04);
  --shadow-lg:0 10px 30px rgba(0,0,0,.08),0 4px 8px rgba(0,0,0,.04);
  --shadow-xl:0 20px 50px rgba(0,0,0,.12);
  --radius:14px;--radius-sm:10px;--radius-xs:8px;
  --font:'Inter',system-ui,-apple-system,sans-serif;
  --transition:0.2s cubic-bezier(.4,0,.2,1);
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit}
input,select{font-family:inherit}

/* ===== CALCULATOR SECTION ===== */
.calculator-section{padding:28px 0 48px;min-height:auto}

/* Header */
.calc-header{text-align:center;margin-bottom:28px}
.calc-header__badge{display:inline-flex;align-items:center;gap:6px;background:var(--primary-light);color:var(--primary);font-weight:600;font-size:.75rem;padding:5px 14px;border-radius:20px;margin-bottom:10px;letter-spacing:.3px;text-transform:uppercase}
.badge-icon{font-size:.85rem}
h1#page-title{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.2;margin-bottom:8px}
.calc-header__sub{color:var(--text-secondary);font-size:.95rem;max-width:560px;margin:0 auto;line-height:1.55}

/* ===== CALC CARD ===== */
.calc-card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);border:1px solid var(--border);overflow:hidden}

/* Direction Bar */
.direction-bar{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 20px;background:linear-gradient(135deg,#FAFBFF,#F5F3FF);border-bottom:1px solid var(--border)}
.direction-btn{display:flex;align-items:center;gap:8px;padding:8px 18px;border-radius:var(--radius-xs);font-size:.85rem;font-weight:600;color:var(--text-secondary);transition:var(--transition);border:2px solid transparent}
.direction-btn.active{color:var(--primary);background:var(--surface);border-color:var(--primary);box-shadow:var(--shadow-sm)}
.direction-btn:hover:not(.active){background:rgba(124,92,252,.06)}
.direction-arrow{opacity:.5}
.direction-btn.active .direction-arrow{opacity:1;color:var(--primary)}
.swap-btn{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--gradient);color:#fff;box-shadow:0 2px 8px rgba(124,92,252,.35);transition:var(--transition)}
.swap-btn:hover{transform:rotate(180deg) scale(1.1);box-shadow:0 4px 16px rgba(124,92,252,.45)}

/* Calc Body */
.calc-body{display:grid;grid-template-columns:1fr auto 1fr;gap:0;padding:28px 28px 24px}

/* Input Side */
.calc-input-side{display:flex;flex-direction:column;gap:16px}
.input-label{display:block;font-size:.78rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}
.input-wrapper{position:relative;display:flex;align-items:center}
.input-field{width:100%;padding:14px 50px 14px 16px;font-size:1.5rem;font-weight:700;color:var(--text);border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);transition:var(--transition);outline:none}
.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(124,92,252,.12);background:#fff}
.input-field::placeholder{color:var(--text-muted);font-weight:400}
.input-unit{position:absolute;right:16px;font-size:.9rem;font-weight:700;color:var(--primary);background:var(--primary-light);padding:4px 10px;border-radius:6px}

/* Quick Buttons */
.quick-buttons{display:flex;gap:8px;flex-wrap:wrap}
.quick-btn{padding:7px 16px;border-radius:20px;font-size:.8rem;font-weight:600;color:var(--text-secondary);background:var(--bg);border:1.5px solid var(--border);transition:var(--transition)}
.quick-btn:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light);transform:translateY(-1px)}
.quick-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Ingredient Trigger */
.ingredient-trigger{width:100%;display:flex;align-items:center;gap:10px;padding:12px 16px;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);transition:var(--transition);text-align:left}
.ingredient-trigger:hover{border-color:var(--primary);background:var(--surface)}
.ingredient-trigger__icon{font-size:1.3rem;flex-shrink:0}
.ingredient-trigger__text{flex:1;font-weight:600;font-size:.92rem;color:var(--text)}
.ingredient-trigger__density{font-size:.75rem;color:var(--text-muted);font-weight:500;white-space:nowrap}
.ingredient-trigger__chevron{color:var(--text-muted);flex-shrink:0;transition:var(--transition)}
.ingredient-trigger[aria-expanded="true"] .ingredient-trigger__chevron{transform:rotate(180deg)}

/* Rounding */
.rounding-option{display:flex;align-items:center;gap:10px}
.rounding-label{font-size:.78rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;white-space:nowrap}
.rounding-select{padding:6px 12px;border:1.5px solid var(--border);border-radius:var(--radius-xs);font-size:.82rem;font-weight:500;color:var(--text);background:var(--bg);outline:none;cursor:pointer;transition:var(--transition)}
.rounding-select:focus{border-color:var(--primary)}

/* ===== VISUAL FLOW ===== */
.calc-visual-flow{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:0 24px;min-width:140px}
.flow-node{text-align:center;padding:14px 18px;border-radius:var(--radius-sm);min-width:110px;transition:var(--transition)}
.flow-node--from{background:var(--primary-light);border:2px solid rgba(124,92,252,.2)}
.flow-node--to{background:var(--success-light);border:2px solid rgba(16,185,129,.2)}
.flow-node__value{font-size:1.35rem;font-weight:800;color:var(--text)}
.flow-node__unit{font-size:.7rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-top:2px}
.flow-connector{display:flex;flex-direction:column;align-items:center;gap:0;padding:4px 0}
.flow-line{width:2px;height:18px;background:linear-gradient(to bottom,var(--primary),var(--success));border-radius:2px}
.flow-ingredient-badge{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--surface);border:1.5px solid var(--border);border-radius:20px;font-size:.72rem;font-weight:600;color:var(--text-secondary);white-space:nowrap;box-shadow:var(--shadow-sm)}

/* ===== RESULT ===== */
.calc-result-side{display:flex;flex-direction:column;align-items:stretch;gap:12px;justify-content:center}
.result-card{background:linear-gradient(135deg,#F0FDF4,#ECFDF5);border:2px solid rgba(16,185,129,.15);border-radius:var(--radius);padding:24px;text-align:center;transition:var(--transition)}
.result-card.has-value{border-color:rgba(16,185,129,.35);box-shadow:0 4px 20px rgba(16,185,129,.12)}
.result-label{font-size:.78rem;font-weight:600;color:var(--success);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}
.result-value-wrap{display:flex;align-items:baseline;justify-content:center;gap:8px}
.result-value{font-size:2.8rem;font-weight:800;color:var(--text);line-height:1;transition:var(--transition)}
.result-unit{font-size:1rem;font-weight:600;color:var(--success)}
.result-fraction{font-size:.85rem;color:var(--text-secondary);margin-top:6px;font-weight:500;min-height:1.2em}
.result-detail{font-size:.8rem;color:var(--text-muted);margin-top:10px;line-height:1.5}
.copy-btn{display:flex;align-items:center;justify-content:center;gap:6px;padding:10px;border-radius:var(--radius-xs);font-size:.82rem;font-weight:600;color:var(--text-secondary);background:var(--bg);border:1.5px solid var(--border);transition:var(--transition)}
.copy-btn:hover{color:var(--primary);border-color:var(--primary);background:var(--primary-light)}
.copy-btn.copied{color:var(--success);border-color:var(--success);background:var(--success-light)}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.45);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;pointer-events:none;transition:opacity .25s ease}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal{background:var(--surface);border-radius:var(--radius);width:100%;max-width:680px;max-height:85vh;display:flex;flex-direction:column;box-shadow:var(--shadow-xl);transform:translateY(12px) scale(.97);transition:transform .25s ease;overflow:hidden}
.modal-overlay.open .modal{transform:translateY(0) scale(1)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--border)}
.modal-title{font-size:1.1rem;font-weight:700;color:var(--text)}
.modal-close{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-xs);color:var(--text-secondary);transition:var(--transition)}
.modal-close:hover{background:var(--bg);color:var(--danger)}

/* Modal Search */
.modal-search-wrap{position:relative;padding:14px 22px 0}
.modal-search{width:100%;padding:11px 16px 11px 42px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:.9rem;font-weight:500;outline:none;transition:var(--transition);background:var(--bg)}
.modal-search:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(124,92,252,.1);background:#fff}
.modal-search-icon{position:absolute;left:36px;top:50%;transform:translateY(-50%);color:var(--text-muted);margin-top:7px}
.modal-search-clear{position:absolute;right:30px;top:50%;transform:translateY(-50%);color:var(--text-muted);transition:var(--transition);margin-top:7px;width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:50%}
.modal-search-clear:hover{background:var(--bg);color:var(--danger)}

/* Tabs */
.modal-tabs{display:flex;flex-wrap:wrap;gap:6px;padding:14px 22px 0;max-width:100%}
.modal-tab{padding:6px 14px;border-radius:20px;font-size:.76rem;font-weight:600;color:var(--text-secondary);white-space:nowrap;transition:var(--transition);border:1.5px solid transparent;background:var(--bg)}
.modal-tab:hover{color:var(--primary);background:var(--primary-light)}
.modal-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* Grid */
.modal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:8px;padding:16px 22px;overflow-y:auto;max-height:50vh;scrollbar-width:thin;scrollbar-color:var(--border) transparent}
.modal-grid::-webkit-scrollbar{width:6px}
.modal-grid::-webkit-scrollbar-track{background:transparent}
.modal-grid::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}

/* Ingredient Item */
.ingredient-item{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:var(--radius-xs);border:1.5px solid var(--border);background:var(--surface);cursor:pointer;transition:var(--transition)}
.ingredient-item:hover{border-color:var(--primary);background:var(--primary-light);transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.ingredient-item.selected{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 3px rgba(124,92,252,.15)}
.ingredient-item__icon{font-size:1.2rem;flex-shrink:0}
.ingredient-item__info{flex:1;min-width:0}
.ingredient-item__name{font-size:.82rem;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ingredient-item__density{font-size:.7rem;color:var(--text-muted);font-weight:500}

/* Category Headers in Grid */
.ingredient-category-header{grid-column:1/-1;font-size:.72rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.8px;padding:8px 4px 2px;border-bottom:1px solid var(--border);margin-top:4px}
.ingredient-category-header:first-child{margin-top:0}

/* Empty State */
.modal-empty{padding:40px;text-align:center;color:var(--text-muted);display:flex;flex-direction:column;align-items:center;gap:10px}
.modal-empty p{font-size:.9rem}
.hidden{display:none!important}

/* ===== SEO SECTION ===== */
.seo-section{padding:48px 0 60px;background:#fff;border-top:1px solid var(--border)}
.seo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.seo-card{padding:28px;border-radius:var(--radius);background:var(--bg);border:1px solid var(--border);transition:var(--transition)}
.seo-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.seo-card__icon{font-size:2rem;margin-bottom:14px}
.seo-card__title{font-size:1.05rem;font-weight:700;color:var(--text);margin-bottom:10px;line-height:1.35}
.seo-card p{font-size:.88rem;color:var(--text-secondary);line-height:1.65;margin-bottom:8px}
.seo-tips{list-style:none;padding:0}
.seo-tips li{font-size:.85rem;color:var(--text-secondary);line-height:1.6;padding:6px 0;padding-left:18px;position:relative}
.seo-tips li::before{content:"";position:absolute;left:0;top:14px;width:6px;height:6px;border-radius:50%;background:var(--primary)}

/* Table */
.seo-table-section{margin-bottom:48px}
.seo-table-title{font-size:1.3rem;font-weight:700;text-align:center;margin-bottom:6px}
.seo-table-desc{text-align:center;color:var(--text-secondary);font-size:.9rem;margin-bottom:24px}
.seo-table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
.seo-table{width:100%;border-collapse:collapse;font-size:.85rem}
.seo-table th{background:linear-gradient(135deg,#7C5CFC,#A78BFA);color:#fff;font-weight:600;padding:12px 16px;text-align:left;white-space:nowrap}
.seo-table th:first-child{border-radius:var(--radius) 0 0 0}
.seo-table th:last-child{border-radius:0 var(--radius) 0 0}
.seo-table td{padding:11px 16px;border-bottom:1px solid var(--border);color:var(--text-secondary)}
.seo-table tr:last-child td{border-bottom:none}
.seo-table tr:nth-child(even){background:#FAFBFF}
.seo-table tr:hover{background:var(--primary-light)}
.seo-table td:first-child{font-weight:600;color:var(--text)}

/* FAQ */
.faq-section{max-width:760px;margin:0 auto}
.faq-title{font-size:1.3rem;font-weight:700;text-align:center;margin-bottom:24px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:rgba(124,92,252,.3)}
.faq-question{width:100%;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;font-size:.92rem;font-weight:600;color:var(--text);text-align:left;transition:var(--transition);background:var(--surface)}
.faq-question:hover{background:var(--bg)}
.faq-chevron{color:var(--text-muted);transition:transform .25s ease;flex-shrink:0}
.faq-question[aria-expanded="true"] .faq-chevron{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease}
.faq-answer p{padding:0 20px 16px;font-size:.88rem;color:var(--text-secondary);line-height:1.65}

/* Footer */
.site-footer{padding:24px 0;text-align:center;border-top:1px solid var(--border);color:var(--text-muted);font-size:.8rem}

/* ===== ANIMATIONS ===== */
@keyframes resultPop{0%{transform:scale(1)}40%{transform:scale(1.08)}100%{transform:scale(1)}}
.result-card.pop .result-value{animation:resultPop .35s ease}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .calc-body{grid-template-columns:1fr;gap:24px;padding:20px}
  .calc-visual-flow{flex-direction:row;padding:16px 0;gap:12px;order:2}
  .flow-connector{flex-direction:row;padding:0 8px}
  .flow-line{width:18px;height:2px}
  .calc-result-side{order:3}
  .seo-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .calculator-section{padding:16px 0 32px}
  .calc-header{margin-bottom:20px}
  .direction-bar{flex-wrap:wrap;gap:6px;padding:12px 14px}
  .direction-btn{padding:7px 12px;font-size:.78rem}
  .calc-body{padding:16px}
  .input-field{font-size:1.2rem;padding:12px 46px 12px 14px}
  .result-value{font-size:2.2rem}
  .modal{max-height:90vh;border-radius:var(--radius) var(--radius) 0 0;align-self:flex-end}
  .modal-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
  .calc-visual-flow{display:none}
  .seo-table{font-size:.78rem}
  .seo-table th,.seo-table td{padding:9px 10px}
}