/* Base Light Mode Variables (Default) */
:root {
    --primary: #0F172A;
    --accent: #22C55E;
    --ev-accent: #8B5CF6;
    --cta: #F59E0B;
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --surface-alt: #F1F5F9;
    --text: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.06);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --efficiency-low: #ef4444;
    --efficiency-avg: #f59e0b;
    --efficiency-good: #22c55e;
    --efficiency-excellent: #10b981;
    --bar-bg: #e2e8f0;
}

/* Dark Mode Variables */
body.dark {
    --primary: #1e293b;
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-alt: #273548;
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;
    --bar-bg: #334155;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;transition:background var(--transition),color var(--transition);min-height:100vh}
.container{max-width:1100px;margin:0 auto;padding:16px 18px}
.header{text-align:center;padding:28px 20px 20px;background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow);margin-bottom:20px;border:1px solid var(--border);position:relative;transition:background var(--transition),border var(--transition);overflow:hidden}
.header::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200' viewBox='0 0 200 200'%3E%3Ccircle cx='40' cy='140' r='8' fill='%2322C55E' opacity='0.25'/%3E%3Ccircle cx='80' cy='160' r='6' fill='%2322C55E' opacity='0.22'/%3E%3Ccircle cx='120' cy='145' r='7' fill='%2322C55E' opacity='0.24'/%3E%3Ccircle cx='160' cy='155' r='5' fill='%2322C55E' opacity='0.20'/%3E%3Ccircle cx='30' cy='170' r='4' fill='%2322C55E' opacity='0.18'/%3E%3Ccircle cx='100' cy='170' r='5' fill='%2322C55E' opacity='0.22'/%3E%3Ccircle cx='150' cy='165' r='6' fill='%2322C55E' opacity='0.18'/%3E%3Ccircle cx='60' cy='175' r='3' fill='%2322C55E' opacity='0.15'/%3E%3Ccircle cx='130' cy='175' r='4' fill='%2322C55E' opacity='0.16'/%3E%3Ccircle cx='20' cy='155' r='5' fill='%2322C55E' opacity='0.18'/%3E%3Ccircle cx='170' cy='170' r='4' fill='%2322C55E' opacity='0.14'/%3E%3Ccircle cx='90' cy='150' r='9' fill='%2322C55E' opacity='0.26'/%3E%3C/svg%3E"),url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='120' viewBox='0 0 300 120'%3E%3Crect x='20' y='20' width='260' height='80' rx='15' fill='none' stroke='%2322C55E' stroke-width='2' opacity='0.30'/%3E%3Crect x='25' y='25' width='120' height='70' rx='10' fill='%2322C55E' opacity='0.12'/%3E%3Ccircle cx='200' cy='40' r='20' fill='none' stroke='%2322C55E' stroke-width='2' opacity='0.30'/%3E%3Ccircle cx='200' cy='40' r='10' fill='%2322C55E' opacity='0.15'/%3E%3Ctext x='250' y='35' font-size='14' fill='%2322C55E' opacity='0.30' font-family='monospace'%3Ekm%3C/text%3E%3Ctext x='250' y='55' font-size='12' fill='%2322C55E' opacity='0.25' font-family='monospace'%3EMP%3C/text%3E%3Ctext x='250' y='75' font-size='11' fill='%2322C55E' opacity='0.22' font-family='monospace'%3EL%3C/text%3E%3C/svg%3E");background-repeat:repeat,no-repeat;background-position:0 0,right center;background-size:200px 200px,280px 100px;pointer-events:none;z-index:0}
body.dark .header::before{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200' viewBox='0 0 200 200'%3E%3Ccircle cx='40' cy='140' r='8' fill='%2322C55E' opacity='0.12'/%3E%3Ccircle cx='80' cy='160' r='6' fill='%2322C55E' opacity='0.10'/%3E%3Ccircle cx='120' cy='145' r='7' fill='%2322C55E' opacity='0.11'/%3E%3Ccircle cx='160' cy='155' r='5' fill='%2322C55E' opacity='0.09'/%3E%3Ccircle cx='30' cy='170' r='4' fill='%2322C55E' opacity='0.08'/%3E%3Ccircle cx='100' cy='170' r='5' fill='%2322C55E' opacity='0.10'/%3E%3Ccircle cx='150' cy='165' r='6' fill='%2322C55E' opacity='0.08'/%3E%3Ccircle cx='60' cy='175' r='3' fill='%2322C55E' opacity='0.07'/%3E%3Ccircle cx='130' cy='175' r='4' fill='%2322C55E' opacity='0.07'/%3E%3Ccircle cx='20' cy='155' r='5' fill='%2322C55E' opacity='0.08'/%3E%3Ccircle cx='170' cy='170' r='4' fill='%2322C55E' opacity='0.06'/%3E%3Ccircle cx='90' cy='150' r='9' fill='%2322C55E' opacity='0.12'/%3E%3C/svg%3E"),url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='120' viewBox='0 0 300 120'%3E%3Crect x='20' y='20' width='260' height='80' rx='15' fill='none' stroke='%2322C55E' stroke-width='2' opacity='0.15'/%3E%3Crect x='25' y='25' width='120' height='70' rx='10' fill='%2322C55E' opacity='0.06'/%3E%3Ccircle cx='200' cy='40' r='20' fill='none' stroke='%2322C55E' stroke-width='2' opacity='0.15'/%3E%3Ccircle cx='200' cy='40' r='10' fill='%2322C55E' opacity='0.08'/%3E%3Ctext x='250' y='35' font-size='14' fill='%2322C55E' opacity='0.15' font-family='monospace'%3Ekm%3C/text%3E%3Ctext x='250' y='55' font-size='12' fill='%2322C55E' opacity='0.12' font-family='monospace'%3EMP%3C/text%3E%3Ctext x='250' y='75' font-size='11' fill='%2322C55E' opacity='0.10' font-family='monospace'%3EL%3C/text%3E%3C/svg%3E")}
.header>*{position:relative;z-index:1}
.header__badge-wrapper{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:10px}
.header__badge{display:inline-block;background:var(--accent);color:#fff;font-size:.75rem;font-weight:700;padding:5px 12px;border-radius:20px;letter-spacing:.04em;text-transform:uppercase}
.header__badge--red{background:#dc2626;color:#ffffff}
.header__badge--blue{background:#3127F5;color:#ffffff}
.header h1{font-size:clamp(1.4rem,3.5vw,1.85rem);font-weight:800;color:var(--text);letter-spacing:-.02em;margin-bottom:6px;transition:color var(--transition)}
.header__subtitle{font-size:.95rem;color:var(--text-secondary);transition:color var(--transition)}
.dark-toggle{position:absolute;top:16px;right:20px;background:var(--surface-alt);border:2px solid var(--border);border-radius:30px;width:auto;min-width:90px;height:auto;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:6px 12px;transition:all var(--transition);z-index:5;font-weight:600;font-size:.8rem;gap:6px}
@media(max-width:600px){.dark-toggle{position:static;margin-bottom:12px;display:inline-flex}}
.dark-toggle__knob{display:inline-flex;align-items:center;justify-content:center;gap:4px;width:auto;height:auto;background:transparent;transition:all var(--transition);color:var(--text)}
.dark-toggle__icon{font-size:1rem;pointer-events:none}
.dark-toggle-text{font-weight:600}
.section-title{font-size:1.2rem;font-weight:700;color:var(--text);margin-bottom:14px;padding-bottom:8px;border-bottom:3px solid var(--accent);display:inline-block;transition:color var(--transition);text-align:center}
.section-title--full{display:block;border-bottom:3px solid var(--accent);padding-bottom:8px;margin-bottom:16px;text-align:center}
.section-title--ev{display:block;border-bottom:3px solid var(--ev-accent);padding-bottom:8px;margin-bottom:16px;text-align:center;color:var(--ev-accent)}
.card{background:var(--surface);border-radius:var(--radius-lg);padding:22px 20px;box-shadow:var(--shadow);margin-bottom:20px;border:1px solid var(--border);transition:all var(--transition);text-align:center}
.card--ev{border-left:4px solid var(--ev-accent)}
.card .form-group,.card .form-row,.card .unit-toggle-wrap,.card .realtime-toggle-wrap,.card .results,.card table,.card .table-wrap,.card .accordion-row,.card .legal-grid{text-align:left}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-weight:600;font-size:.9rem;margin-bottom:5px;color:var(--text);transition:color var(--transition)}
.form-group input,.form-group select{width:100%;padding:11px 14px;font-size:1rem;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-alt);color:var(--text);transition:all var(--transition);font-family:inherit;-webkit-appearance:none;appearance:none}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(34,197,94,0.1)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:480px){.form-row{grid-template-columns:1fr}}
.unit-toggle-wrap{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}
.unit-toggle-wrap span{font-weight:600;font-size:.9rem;color:var(--text);transition:color var(--transition)}
.unit-toggle{display:flex;background:var(--surface-alt);border-radius:25px;overflow:hidden;border:2px solid var(--border)}
.unit-toggle button{padding:8px 18px;border:none;background:transparent;cursor:pointer;font-weight:600;font-size:.88rem;color:var(--text-secondary);transition:all var(--transition);white-space:nowrap}
.unit-toggle button.active{background:var(--accent);color:#fff}
.unit-toggle button.active--ev{background:var(--ev-accent);color:#fff}
.unit-toggle button:hover:not(.active):not(.active--ev){background:var(--border-light)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:1rem;font-weight:700;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);letter-spacing:.01em;text-decoration:none;min-height:44px}
.btn--cta{background:var(--cta);color:#1e293b;width:100%;font-size:1.05rem;box-shadow:0 4px 14px rgba(245,158,11,0.35)}
.btn--cta:hover{background:#d97706;transform:translateY(-2px);box-shadow:0 8px 22px rgba(245,158,11,0.45)}
.btn--cta:active{transform:translateY(0);box-shadow:0 2px 8px rgba(245,158,11,0.3)}
.btn--ev{background:var(--ev-accent);color:#fff;width:100%;font-size:1.05rem;box-shadow:0 4px 14px rgba(139,92,246,0.35)}
.btn--ev:hover{background:#7c3aed;transform:translateY(-2px);box-shadow:0 8px 22px rgba(139,92,246,0.45)}
.btn--sm{padding:7px 14px;font-size:.82rem;border-radius:6px;min-height:34px}
.btn--outline{background:transparent;border:2px solid var(--border);color:var(--text)}
.btn--outline:hover{border-color:var(--accent);color:var(--accent);background:rgba(34,197,94,0.04)}
.btn--danger{background:#ef4444;color:#fff}.btn--danger:hover{background:#dc2626}
.btn--accent{background:var(--accent);color:#fff}.btn--accent:hover{background:#16a34a}
.btn--warning{background:#f59e0b;color:#1e293b}.btn--warning:hover{background:#d97706}
.results{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px;animation:fadeInUp .4s ease}
@media(max-width:480px){.results{grid-template-columns:1fr}}
@keyframes fadeInUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.result-card{background:var(--surface-alt);border-radius:var(--radius);padding:16px;text-align:center;border:2px solid var(--border);transition:all var(--transition)}
.result-card--ev{border-color:var(--ev-accent)}
.result-card__value{font-size:2rem;font-weight:800;color:var(--accent);letter-spacing:-.02em;transition:color var(--transition)}
.result-card__value--ev{color:var(--ev-accent)}
.result-card__label{font-size:.82rem;color:var(--text-secondary);margin-top:2px;transition:color var(--transition)}
.result-card--efficiency{grid-column:1/-1}
.efficiency-bar-wrap{margin-top:10px}
.efficiency-bar-outer{height:14px;background:var(--bar-bg);border-radius:10px;overflow:hidden;transition:background var(--transition)}
.efficiency-bar-inner{height:100%;border-radius:10px;transition:width .5s ease,background .5s ease;width:0%}
.efficiency-label{font-weight:700;font-size:.9rem;margin-top:6px;transition:color var(--transition)}
.efficiency--low{color:var(--efficiency-low)}.efficiency--avg{color:var(--efficiency-avg)}.efficiency--good{color:var(--efficiency-good)}.efficiency--excellent{color:var(--efficiency-excellent)}
.realtime-toggle-wrap{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:.88rem;color:var(--text-secondary);transition:color var(--transition);cursor:pointer;user-select:none}
.realtime-toggle-wrap input{width:18px;height:18px;accent-color:var(--accent);cursor:pointer}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin-top:14px;border-radius:var(--radius-sm);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:.85rem;min-width:700px}
table th,table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap;transition:all var(--transition)}
table th{background:var(--primary);color:#fff;font-weight:700;font-size:.78rem;letter-spacing:.03em;text-transform:uppercase;position:sticky;top:0;z-index:1}
table tbody tr{transition:background var(--transition)}table tbody tr:hover{background:var(--surface-alt)}
.table-actions{display:flex;gap:6px}
.badge{display:inline-block;padding:4px 10px;border-radius:12px;font-size:.75rem;font-weight:700;letter-spacing:.02em}
.badge--good{background:#d1fae5;color:#065f46}.badge--avg{background:#fef3c7;color:#92400e}.badge--low{background:#fee2e2;color:#991b1b}
.badge--ev{background:#ede9fe;color:#5b21b6}
body.dark .badge--good{background:#064e3b;color:#a7f3d0}body.dark .badge--avg{background:#5c3d0e;color:#fde68a}body.dark .badge--low{background:#5b1a1a;color:#fecaca}
body.dark .badge--ev{background:#4c1d95;color:#c4b5fd}
.empty-state{text-align:center;padding:30px;color:var(--text-muted);font-style:italic}
.accordion{border:2px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden;transition:all var(--transition);background:var(--surface)}
.accordion__trigger{width:100%;text-align:left;padding:15px 18px;background:var(--surface);border:none;cursor:pointer;font-weight:700;font-size:.95rem;color:var(--text);display:flex;justify-content:center;align-items:center;transition:all var(--transition);gap:12px}
.accordion__trigger:hover{background:var(--surface-alt)}
.accordion__icon{margin-left:auto;font-size:1.3rem;transition:transform var(--transition);flex-shrink:0;color:var(--accent);font-weight:700}
.accordion.open .accordion__icon{transform:rotate(45deg)}
.accordion__content{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;background:var(--surface-alt)}
.accordion.open .accordion__content{max-height:800px}
.accordion__inner{padding:16px 18px;color:var(--text-secondary);font-size:.9rem;line-height:1.7;transition:color var(--transition)}
.accordion__inner ul,.accordion__inner ol{padding-left:20px;margin:8px 0}.accordion__inner li{margin-bottom:4px}
.accordion-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.accordion-row .accordion{margin-bottom:0}
@media(max-width:768px){.accordion-row{grid-template-columns:1fr}}
.legal-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.legal-grid .accordion{margin-bottom:0}
@media(max-width:768px){.legal-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.legal-grid{grid-template-columns:1fr}}
.social-share{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px;justify-content:center}
.social-share a{display:inline-flex;align-items:center;gap:7px;padding:10px 16px;border-radius:25px;font-weight:600;font-size:.85rem;text-decoration:none;color:#fff;transition:all var(--transition);min-height:40px}
.social-share a:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.share-fb{background:#1877F2}.share-wa{background:#25D366}.share-x{background:#000}.share-li{background:#0A66C2}
.internal-links{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.internal-links a{color:var(--accent);font-weight:600;text-decoration:none;padding:8px 14px;border-radius:20px;background:var(--surface-alt);transition:all var(--transition);font-size:.88rem}
.internal-links a:hover{background:var(--accent);color:#fff}
.ev-badge{display:inline-block;background:var(--ev-accent);color:#fff;font-size:.7rem;font-weight:700;padding:3px 8px;border-radius:12px;margin-left:6px;vertical-align:middle}
.footer{text-align:center;padding:22px 18px;color:var(--text-muted);font-size:.85rem;border-top:2px solid var(--border);margin-top:24px;transition:all var(--transition)}
.footer a{color:var(--accent);text-decoration:none;font-weight:600}.footer a:hover{text-decoration:underline}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--primary);color:#fff;padding:12px 24px;border-radius:25px;font-weight:600;font-size:.9rem;z-index:999;box-shadow:var(--shadow-lg);transition:transform .35s ease;pointer-events:none}
.toast.show{transform:translateX(-50%) translateY(0)}
.tab-container{display:flex;gap:4px;margin-bottom:16px;background:var(--surface-alt);border-radius:25px;padding:4px;border:2px solid var(--border)}
.tab-btn{flex:1;padding:10px 16px;border:none;background:transparent;cursor:pointer;font-weight:600;font-size:.88rem;color:var(--text-secondary);border-radius:22px;transition:all var(--transition);white-space:nowrap}
.tab-btn.active{background:var(--accent);color:#fff}
.tab-btn.ev-active{background:var(--ev-accent);color:#fff}
.tab-btn:hover:not(.active):not(.ev-active){background:var(--border-light)}
.embed-container{margin-top:20px;padding:16px;background:var(--surface-alt);border-radius:var(--radius);border:2px solid var(--border);text-align:center}
.embed-container textarea{width:100%;padding:12px;font-family:monospace;font-size:.85rem;background:var(--surface);color:var(--text);border:2px solid var(--border);border-radius:var(--radius-sm);margin-top:12px;resize:vertical}
.copy-btn{margin-top:12px;background:var(--accent);color:#fff;border:none;padding:8px 20px;border-radius:25px;cursor:pointer;font-weight:600;transition:all var(--transition)}
.copy-btn:hover{background:#16a34a;transform:translateY(-2px)}
.embed-heading{margin:0 0 8px 0;font-size:1.2rem;color:var(--accent)}
.summary-row{font-weight:700;background:var(--surface-alt)}
.summary-label{text-align:right;font-weight:700}
.summary-value{font-weight:700}
.install-prompt{position:fixed;bottom:20px;left:20px;right:20px;background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:16px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;z-index:1000;border:2px solid var(--accent);animation:slideUp 0.3s ease}
@keyframes slideUp{from{transform:translateY(100px);opacity:0}to{transform:translateY(0);opacity:1}}
.install-prompt button{background:var(--accent);color:#fff;border:none;padding:8px 20px;border-radius:25px;cursor:pointer;font-weight:600}
.install-prompt button:last-child{background:var(--surface-alt);color:var(--text);border:1px solid var(--border)}
@media(min-width:768px){.install-prompt{left:auto;right:20px;min-width:300px}}