*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
:root{
  --green:#4eb3c0;--green-dark:#008040;--green-light:#e6f7ee;
  --text:#333;--muted:#666;--light:#999;
  --border:#d0d0d0;--border-focus:#00a651;
  --bg:#fff;--bg-page:#f5f5f5;
  --error:#d32f2f;--error-bg:#fff5f5;
  --success:#2e7d32;--success-bg:#e8f5e9;
  --label:#444;--ih:42px;--r:4px;
  --shadow:0 1px 3px rgba(0,0,0,0.08);
  --shadow-card:0 2px 12px rgba(0,0,0,0.10);
  --font:'Segoe UI',system-ui,-apple-system,sans-serif;
}
html{font-size:15px;scroll-behavior:smooth;}
body{font-family:var(--font);color:var(--text);background:var(--bg-page);line-height:1.6;min-height:100vh;}

/* HEADER */
.site-header{background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow);}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px;}
.logo-link{display:flex;align-items:center;text-decoration:none;flex-shrink:0;}
.logo-img{height:50px;width:auto;object-fit:contain;}
.nav-link{color:var(--text);text-decoration:none;font-size:0.93rem;font-weight:500;transition:color 0.15s;}
.nav-link:hover{color:var(--green);}

/* MAIN */
.main-content{padding:40px 16px 60px;}
.form-container{max-width:780px;margin:0 auto;background:var(--bg);border-radius:6px;box-shadow:var(--shadow-card);overflow:hidden;}
.form-header{background:var(--green);padding:28px 36px 24px;}
.form-title{font-size:1.35rem;font-weight:600;color:#fff;margin-bottom:6px;}
.form-subtitle{font-size:0.85rem;color:rgba(255,255,255,0.82);font-style:italic;}
form{padding:28px 36px 36px;display:flex;flex-direction:column;}

/* SECTION */
.section-title{font-size:0.88rem;font-weight:700;color:var(--green-dark);letter-spacing:0.06em;text-transform:uppercase;padding:12px 0 8px;border-bottom:2px solid var(--green-light);margin-bottom:20px;}
.section-note{font-size:0.82rem;color:var(--muted);margin-bottom:16px;margin-top:-10px;}

/* FORM GROUPS */
.form-group{margin-bottom:18px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.form-label{display:block;font-size:0.88rem;font-weight:600;color:var(--label);margin-bottom:6px;line-height:1.4;}
.req{color:var(--error);margin-left:2px;}

/* INPUTS */
.form-input{width:100%;height:var(--ih);padding:0 12px;border:1px solid var(--border);border-radius:var(--r);font-size:0.93rem;color:var(--text);background:var(--bg);font-family:var(--font);outline:none;transition:border-color 0.15s,box-shadow 0.15s;appearance:none;}
.form-input:hover{border-color:#aaa;}
.form-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(0,166,81,0.12);}
.form-input.error{border-color:var(--error);background:var(--error-bg);}
.form-textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--r);font-size:0.93rem;color:var(--text);background:var(--bg);font-family:var(--font);outline:none;resize:vertical;min-height:80px;line-height:1.5;transition:border-color 0.15s,box-shadow 0.15s;}
.form-textarea:hover{border-color:#aaa;}
.form-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(0,166,81,0.12);}
.form-textarea.error{border-color:var(--error);background:var(--error-bg);}

/* SELECT */
.select-wrapper{position:relative;}
.form-select{width:100%;height:var(--ih);padding:0 36px 0 12px;border:1px solid var(--border);border-radius:var(--r);font-size:0.93rem;color:var(--text);background:var(--bg);font-family:var(--font);outline:none;appearance:none;cursor:pointer;transition:border-color 0.15s,box-shadow 0.15s;}
.form-select:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(0,166,81,0.12);}
.form-select.error{border-color:var(--error);background:var(--error-bg);}
.select-arrow{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:0.7rem;color:var(--muted);pointer-events:none;}

/* CHECKBOXES */
.checkbox-group{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:4px;}
.checkbox-option{display:flex;align-items:center;gap:7px;cursor:pointer;user-select:none;}
.checkbox-option input[type=checkbox]{position:absolute;opacity:0;width:0;height:0;}
.checkbox-custom{width:18px;height:18px;border-radius:3px;border:2px solid var(--border);background:var(--bg);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all 0.15s;}
.checkbox-custom::after{content:'';width:5px;height:9px;border:2px solid #fff;border-top:none;border-left:none;transform:rotate(45deg) translateY(-1px);opacity:0;transition:opacity 0.1s;}
.checkbox-option input[type=checkbox]:checked+.checkbox-custom{background:var(--green);border-color:var(--green);}
.checkbox-option input[type=checkbox]:checked+.checkbox-custom::after{opacity:1;}
.checkbox-label{font-size:0.88rem;color:var(--text);}

/* ═══ PRODUCT CARDS ═══ */
.product-card{border:1.5px solid var(--border);border-radius:8px;margin-bottom:12px;overflow:hidden;transition:border-color 0.15s,box-shadow 0.15s;}
.product-card.active{border-color:var(--green);box-shadow:0 0 0 3px rgba(0,166,81,0.08);}

.product-header{display:flex;align-items:center;gap:12px;padding:15px 20px;cursor:pointer;user-select:none;background:#fafafa;transition:background 0.15s;}
.product-header:hover{background:var(--green-light);}
.product-card.active .product-header{background:var(--green-light);}
.product-header input[type=checkbox]{position:absolute;opacity:0;width:0;height:0;}

.pcheck{width:22px;height:22px;border-radius:5px;border:2px solid var(--border);background:#fff;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all 0.15s;}
.pcheck::after{content:'';width:6px;height:11px;border:2.5px solid #fff;border-top:none;border-left:none;transform:rotate(45deg) translateY(-1px);opacity:0;transition:opacity 0.1s;}
.product-card.active .pcheck{background:var(--green);border-color:var(--green);}
.product-card.active .pcheck::after{opacity:1;}

.pname{font-size:0.95rem;font-weight:600;color:var(--text);flex:1;}
.product-card.active .pname{color:var(--green-dark);}

.ptag{font-size:0.68rem;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;padding:2px 8px;background:rgba(0,166,81,0.1);color:var(--green-dark);border-radius:12px;border:1px solid rgba(0,166,81,0.2);}

.product-body{border-top:1px solid var(--border);padding:0;background:var(--bg);}
.product-body.hidden{display:none;}

/* ═══ UNIT CARD ═══ */
.unit-card{border:1px solid #e8e8e8;border-radius:6px;margin:16px 16px 0;padding:16px;background:#fafbff;position:relative;}
.unit-card:last-of-type{margin-bottom:0;}

.unit-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;}
.unit-number{font-size:0.78rem;font-weight:700;color:var(--green-dark);letter-spacing:0.08em;text-transform:uppercase;background:var(--green-light);padding:3px 10px;border-radius:12px;}
.btn-remove-unit{background:none;border:1px solid #ffcdd2;border-radius:5px;color:#c62828;font-size:0.75rem;font-weight:600;padding:3px 10px;cursor:pointer;transition:all 0.15s;}
.btn-remove-unit:hover{background:#ffebee;}

/* Add unit button */
.btn-add-unit{display:flex;align-items:center;gap:6px;margin:12px 16px 16px;padding:8px 16px;background:none;border:1.5px dashed var(--green);border-radius:6px;color:var(--green-dark);font-family:var(--font);font-size:0.82rem;font-weight:600;cursor:pointer;transition:all 0.15s;width:calc(100% - 32px);}
.btn-add-unit:hover{background:var(--green-light);}

/* FIELD ERROR */
.field-error{display:block;font-size:0.8rem;color:var(--error);margin-top:5px;line-height:1.4;}

/* SUBMIT */
.form-submit-row{display:flex;align-items:center;gap:16px;margin-top:8px;}
.btn-submit{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 36px;background:var(--green);color:#fff;border:none;border-radius:var(--r);font-size:0.95rem;font-weight:600;font-family:var(--font);cursor:pointer;letter-spacing:0.02em;transition:background 0.15s,transform 0.1s;min-width:120px;}
.btn-submit:hover{background:var(--green-dark);}
.btn-submit:active{transform:scale(0.98);}
.btn-submit:disabled{background:#a0d4b8;cursor:not-allowed;transform:none;}
.spinner{display:none;width:16px;height:16px;border:2px solid rgba(255,255,255,0.4);border-top-color:#fff;border-radius:50%;animation:spin 0.7s linear infinite;}
.btn-submit.loading .spinner{display:block;}
@keyframes spin{to{transform:rotate(360deg);}}

/* SUCCESS */
.form-success{margin-top:20px;padding:16px 20px;background:var(--success-bg);border:1px solid #a5d6a7;border-radius:var(--r);color:var(--success);font-size:0.92rem;display:flex;align-items:flex-start;gap:10px;}
.form-success.hidden{display:none;}
.success-icon{font-size:1.1rem;flex-shrink:0;}

/* RESPONSIVE */
@media(min-width:768px){.main-content{padding:48px 24px 72px;}}
@media(max-width:600px){
  form{padding:20px 20px 28px;}
  .form-header{padding:20px 20px 18px;}
  .form-row{grid-template-columns:1fr;}
  .header-nav{display:none;}
  .unit-card{margin:12px 10px 0;padding:14px;}
  .btn-add-unit{margin:10px 10px 12px;width:calc(100% - 20px);}
}