:root{--material-ink:#071d38;--material-copy:#526b82;--material-line:#d2e1ec;--material-mint:#27c58d;--material-blue:#318cf0;--material-gold:#edb43c;--material-red:#e36f63;--material-shadow:0 24px 55px rgba(7,36,67,.11);--material-soft:0 16px 38px rgba(7,36,67,.075)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
.material-pro{margin:0;color:var(--material-ink);background:radial-gradient(circle at 92% 8%,rgba(39,197,141,.14),transparent 31rem),radial-gradient(circle at 4% 24%,rgba(49,140,240,.11),transparent 34rem),linear-gradient(180deg,#f6fbff,#edf5f8 70rem,#f8fbfd);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.material-pro .container{width:min(1180px,calc(100% - 40px));margin-inline:auto}
.material-pro a{color:inherit}
.material-pro .site-header{position:relative;z-index:30;background:rgba(255,255,255,.86);backdrop-filter:blur(18px);border-bottom:1px solid rgba(205,222,235,.85)}
.material-pro .header-inner{min-height:76px}
.material-pro .brand-logo img{display:block;width:190px;height:auto}
.material-pro .main-nav{display:flex;gap:4px;padding:5px;border:1px solid #d8e5ee;border-radius:999px;background:rgba(255,255,255,.84)}
.material-pro .main-nav a{padding:10px 15px;border-radius:999px;color:#4c6379;font-size:.78rem;font-weight:850;text-decoration:none}
.material-pro .main-nav a[aria-current=page],.material-pro .main-nav a:hover{color:#0b2a46;background:#eef5fa}
.material-pro .header-cta,.material-pro .btn-primary,.material-pro .btn-secondary{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 18px;border-radius:999px;font-size:.78rem;font-weight:950;text-decoration:none;cursor:pointer}
.material-pro .header-cta,.material-pro .btn-primary{border:0;color:#fff;background:linear-gradient(135deg,#083563,#2f78ea 58%,#20ba83);box-shadow:0 15px 28px rgba(21,91,158,.18)}
.material-pro .btn-secondary{border:1px solid #cdddea;color:#0b2c49;background:#fff}
.material-pro .eyebrow{display:inline-flex;width:max-content;margin:0 0 12px;padding:7px 10px;border-radius:999px;color:#0f785c;background:#e8f9f3;font-size:.64rem;font-weight:950;letter-spacing:.08em;text-transform:uppercase}

/* Hero */
.material-hero{padding:35px 0 26px;background:linear-gradient(115deg,rgba(219,240,255,.72),rgba(236,251,246,.58))}
.material-hero-grid{display:grid;grid-template-columns:minmax(0,1.03fr) minmax(410px,.77fr);gap:24px;align-items:stretch}
.material-hero-copy,.material-visual{position:relative;overflow:hidden;border:1px solid rgba(209,226,238,.95);border-radius:32px;box-shadow:var(--material-shadow)}
.material-hero-copy{padding:clamp(30px,4.5vw,58px);background:radial-gradient(circle at 90% 6%,rgba(39,197,141,.11),transparent 17rem),rgba(255,255,255,.95)}
.material-hero-copy::after{content:"";position:absolute;width:190px;height:190px;right:-110px;bottom:-120px;border:1px solid rgba(49,140,240,.13);border-radius:50%}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:25px;color:#61798e;font-size:.7rem;font-weight:850}
.breadcrumb a{text-decoration:none}.breadcrumb span{color:#a1b0bd}
.material-hero h1{max-width:700px;margin:0;font-size:clamp(3rem,5.25vw,5rem);line-height:.94;letter-spacing:-.067em}
.material-hero .lead{max-width:675px;margin:22px 0 0;color:#4f687f;font-size:1rem;font-weight:680;line-height:1.7}
.material-hero .hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.material-trust{display:flex;flex-wrap:wrap;gap:7px;margin-top:19px}
.material-trust span{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid #d7e4ed;border-radius:999px;color:#506a80;background:#fff;font-size:.63rem;font-weight:850}
.material-trust span::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--material-mint);box-shadow:0 0 0 4px rgba(39,197,141,.11)}
.material-mobile-snapshot{display:none}
.material-visual{display:flex;flex-direction:column;min-height:560px;padding:25px;color:#fff;background:radial-gradient(circle at 82% 10%,rgba(49,140,240,.42),transparent 24rem),radial-gradient(circle at 15% 92%,rgba(39,197,141,.34),transparent 22rem),linear-gradient(145deg,#061c36,#092d58 66%,#0a645d)}
.material-visual::before{content:"";position:absolute;inset:0;opacity:.22;background-image:linear-gradient(rgba(255,255,255,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.10) 1px,transparent 1px);background-size:30px 30px;mask-image:linear-gradient(to bottom,#000,transparent 75%)}
.visual-topline,.material-scene,.visual-dashboard{position:relative;z-index:1}
.visual-topline{display:flex;justify-content:space-between;gap:15px;align-items:center;color:#bcd0df;font-size:.64rem;font-weight:950;letter-spacing:.08em;text-transform:uppercase}
.visual-topline b{padding:8px 10px;border:1px solid rgba(255,255,255,.14);border-radius:999px;color:#aff0da;background:rgba(255,255,255,.07);font-size:.57rem}
.material-scene{display:grid;place-items:center;flex:1;min-height:255px;perspective:700px}
.material-object{position:relative;width:260px;height:138px;border:1px solid rgba(255,255,255,.58);background:linear-gradient(145deg,rgba(90,181,244,.23),rgba(39,197,141,.36));box-shadow:inset 0 0 0 10px rgba(255,255,255,.035),0 24px 45px rgba(0,0,0,.22);transform:rotateX(58deg) rotateZ(-23deg)}
.material-object::before{content:"";position:absolute;left:18px;right:18px;top:18px;bottom:18px;border:1px dashed rgba(255,255,255,.45)}
.material-object::after{content:"";position:absolute;right:-25px;top:25px;width:25px;height:100%;border:1px solid rgba(255,255,255,.32);background:rgba(39,197,141,.19);transform:skewY(36deg)}
.material-object i{position:absolute;inset:27px;background:repeating-linear-gradient(135deg,rgba(238,180,60,.42) 0 7px,rgba(39,197,141,.18) 7px 14px)}
.scene-measure{position:absolute;padding:5px 7px;border:1px solid rgba(255,255,255,.14);border-radius:999px;color:#fff;background:#061a31;font-size:.55rem;font-weight:900;white-space:nowrap;transform:rotateZ(23deg) rotateX(-58deg)}
.scene-x{left:82px;bottom:-42px}.scene-y{right:-48px;top:55px}.scene-z{left:-50px;top:38px}
.material-scene[data-scene=cylinder] .material-object{width:180px;height:180px;border-radius:50%;transform:rotateX(62deg);background:radial-gradient(circle at 50% 45%,rgba(237,180,60,.38),rgba(49,140,240,.25) 55%,rgba(39,197,141,.4))}
.material-scene[data-scene=cylinder] .material-object::after{display:none}
.material-scene[data-scene=trench] .material-object{clip-path:polygon(15% 0,85% 0,100% 100%,0 100%)}
.visual-dashboard{display:grid;grid-template-columns:1fr 1fr;gap:9px;padding:13px;border:1px solid rgba(255,255,255,.14);border-radius:22px;background:rgba(255,255,255,.08);backdrop-filter:blur(8px)}
.visual-main{grid-column:1/-1;padding:16px;border-radius:17px;background:rgba(255,255,255,.10)}
.visual-main span,.visual-mini span{display:block;color:#afc7d7;font-size:.61rem;font-weight:850}.visual-main strong{display:block;margin-top:5px;font-size:2rem;letter-spacing:-.05em}.visual-main small{color:#9db4c5;font-size:.57rem;font-weight:700}
.visual-mini{padding:13px 15px;border:1px solid rgba(255,255,255,.10);border-radius:16px;background:rgba(2,18,34,.26)}
.visual-mini strong{display:block;margin-top:5px;font-size:1rem}

/* Anchor */
.material-pro .anchor-nav{position:relative;z-index:auto;top:auto;padding:9px 0;border-block:1px solid rgba(209,225,236,.85);background:rgba(239,247,250,.9);backdrop-filter:blur(15px)}
.anchor-scroll{display:flex;gap:7px;overflow-x:auto;scrollbar-width:none}.anchor-scroll::-webkit-scrollbar{display:none}
.anchor-scroll a{flex:0 0 auto;padding:9px 12px;border:1px solid #d6e3ec;border-radius:999px;color:#4f687e;background:#fff;font-size:.67rem;font-weight:850;text-decoration:none}

/* Workspace */
.material-work{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(380px,.72fr);gap:22px;align-items:start;padding:34px 0 18px}
.material-form,.material-result,.material-section{position:relative;border:1px solid rgba(209,225,236,.96);background:rgba(255,255,255,.95);box-shadow:var(--material-soft)}
.material-form{overflow:hidden;padding:clamp(23px,3.2vw,34px);border-radius:30px}
.material-form::before,.material-result::before,.material-section::before{content:"";position:absolute;z-index:1;left:0;right:0;top:0;height:4px;background:linear-gradient(90deg,var(--material-mint),var(--material-blue),var(--material-gold))}
.form-top,.result-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}
.form-top h2,.result-top h2{margin:0;font-size:clamp(1.75rem,3vw,2.35rem);line-height:1.05;letter-spacing:-.05em}
.form-top .eyebrow,.result-top .eyebrow{margin-bottom:8px}
.live-badge{display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;padding:8px 11px;border:1px solid #d6e9e3;border-radius:999px;color:#2c705e;background:#f0faf6;font-size:.66rem;font-weight:850}
.live-badge i{width:8px;height:8px;border-radius:50%;background:var(--material-mint);box-shadow:0 0 0 5px rgba(39,197,141,.12)}
.mode-switch{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:23px 0 26px;padding:7px;border:1px solid #dbe6ee;border-radius:21px;background:#f2f7fa}
.mode-button{display:flex;align-items:center;gap:12px;min-width:0;padding:13px 14px;border:1px solid transparent;border-radius:16px;color:#5a7085;background:transparent;text-align:left;cursor:pointer;transition:.18s ease}
.mode-button:hover{background:rgba(255,255,255,.7)}.mode-button.is-active{color:var(--material-ink);border-color:#d5e3ec;background:#fff;box-shadow:0 10px 24px rgba(7,34,62,.08)}
.mode-number{display:grid;place-items:center;width:32px;height:32px;flex:0 0 32px;border-radius:10px;color:#41637b;background:#e7eff5;font-size:.68rem;font-weight:950}.mode-button.is-active .mode-number{color:#fff;background:linear-gradient(135deg,#196c9a,var(--material-mint))}
.mode-button>span:last-child{display:grid;min-width:0}.mode-button strong{font-size:.87rem}.mode-button small{margin-top:3px;color:#718599;font-size:.65rem;font-weight:700;white-space:normal}
.section-label{display:flex;align-items:center;gap:11px;margin:22px 0 13px}.section-label>span{display:grid;place-items:center;width:30px;height:30px;flex:0 0 30px;border-radius:10px;color:#126f5a;background:#e6f8f1;font-size:.73rem;font-weight:950}.section-label>div{display:grid;gap:2px}.section-label strong{font-size:.9rem}.section-label small{color:#75889b;font-size:.69rem;font-weight:700;line-height:1.35}
.shape-picker{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin:0;padding:0;border:0}.shape-option{position:relative;min-width:0;cursor:pointer}.shape-option input{position:absolute;opacity:0;pointer-events:none}
.shape-card{display:grid;justify-items:center;align-content:start;min-height:138px;padding:15px 8px;border:1px solid #d9e5ed;border-radius:18px;color:#5b7186;background:#fbfdff;text-align:center;transition:.18s ease}.shape-card b{color:#23435d;font-size:.79rem}.shape-card small{margin-top:5px;color:#7d8e9e;font-size:.59rem;line-height:1.3}
.shape-icon{position:relative;display:block;width:53px;height:40px;margin:0 0 12px;border:2px solid #66869d;background:rgba(49,140,240,.08);transform:skewY(-12deg)}.shape-icon::before{content:"";position:absolute;inset:8px;border:1px dashed #83a1b6}.shape-cylinder{width:42px;border-radius:50%;transform:rotateX(58deg)}.shape-trench{clip-path:polygon(15% 0,85% 0,100% 100%,0 100%)}.shape-layer{height:28px;margin-top:6px}.shape-cube{box-shadow:9px 7px 0 rgba(39,197,141,.13)}
.shape-option:hover .shape-card{transform:translateY(-2px);border-color:#91ccbb;box-shadow:0 9px 18px rgba(7,34,62,.07)}.shape-option input:checked+.shape-card{border-color:#58caa8;background:linear-gradient(145deg,#effbf7,#fff);box-shadow:0 10px 24px rgba(39,197,141,.12)}.shape-option input:checked+.shape-card .shape-icon{border-color:#15936f;background:rgba(39,197,141,.12)}.shape-option input:focus-visible+.shape-card{outline:3px solid rgba(49,140,240,.32);outline-offset:2px}
.preset-row{display:flex;flex-wrap:wrap;gap:7px;margin:11px 0 24px}.preset-row button{padding:8px 10px;border:1px solid #dbe5ed;border-radius:999px;color:#526b80;background:#fff;font-size:.65rem;font-weight:850;cursor:pointer}.preset-row button:hover,.preset-row button[aria-pressed=true]{color:#0d7057;border-color:#85d5ba;background:#ebfaf4}
.shape-panel[hidden],.advanced-panel[hidden],.advanced-results[hidden]{display:none!important}.field-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.shape-panel[data-shape-panel=layer] .field-grid,.shape-panel[data-shape-panel=cylinder] .field-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.shape-panel[data-shape-panel=trench] .field-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.field{display:grid;gap:6px;min-width:0}.field>span{color:#18364f;font-size:.77rem;font-weight:900}.field>small{min-height:18px;color:#788b9d;font-size:.63rem;line-height:1.35;font-weight:650}.input-wrap{display:flex;align-items:center;min-height:53px;border:1px solid #d5e2ec;border-radius:15px;background:#fff;overflow:hidden;transition:.16s ease}.input-wrap:focus-within{border-color:#55c9a7;box-shadow:0 0 0 4px rgba(39,197,141,.11)}.input-wrap input,.input-wrap select{width:100%;min-width:0;padding:14px 4px 14px 14px;border:0;outline:0;color:#102e47;background:transparent;font:inherit;font-size:.87rem;font-weight:900}.input-wrap select{padding-right:8px}.input-wrap em{flex:0 0 auto;padding:0 13px;color:#687e92;font-size:.67rem;font-style:normal;font-weight:850;white-space:nowrap}
.material-row{display:grid;grid-template-columns:minmax(0,.85fr) minmax(300px,1.15fr);gap:13px}.reserve-card{display:grid;gap:9px;padding:13px 15px;border:1px solid #d4e7e0;border-radius:18px;background:linear-gradient(135deg,#effaf6,#f7fbfe)}.reserve-head{display:flex;justify-content:space-between;gap:12px;color:#274b62;font-size:.72rem;font-weight:850}.reserve-head strong{color:#0d7259}.reserve-card>input{width:100%;accent-color:var(--material-mint)}.reserve-presets{display:flex;gap:5px}.reserve-presets button{flex:1;padding:6px 4px;border:1px solid #d5e5df;border-radius:9px;color:#607a70;background:#fff;font-size:.61rem;font-weight:900;cursor:pointer}.reserve-presets button.is-active,.reserve-presets button:hover{color:#fff;border-color:transparent;background:linear-gradient(135deg,#15795f,var(--material-mint))}
.advanced-panel{margin-top:18px;padding:17px;border:1px solid #d8e5ed;border-radius:22px;background:#fbfdff}.advanced-intro{display:flex;gap:12px;align-items:flex-start;margin-bottom:16px;padding:15px 17px;border:1px solid #cfe2ee;border-radius:18px;background:linear-gradient(135deg,#edf7ff,#f1fbf7)}.advanced-intro>span{display:inline-flex;flex:0 0 auto;padding:6px 9px;border-radius:999px;color:#fff;background:#136a92;font-size:.6rem;font-weight:900;text-transform:uppercase;letter-spacing:.06em}.advanced-intro>div{display:grid;gap:3px}.advanced-intro strong{font-size:.84rem}.advanced-intro small{color:#667d91;font-size:.67rem;line-height:1.4}.advanced-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.advanced-note{display:flex;gap:10px;align-items:flex-start;margin-top:14px;padding:13px;border-left:4px solid var(--material-mint);border-radius:5px 14px 14px 5px;color:#45667c;background:#eef9f5;font-size:.69rem;line-height:1.5}.advanced-note strong{flex:0 0 auto;color:#0c7057}
.form-error{margin:15px 0 0;padding:12px 14px;border:1px solid #efb2b2;border-radius:14px;color:#8a2020;background:#fff3f3;font-size:.75rem;font-weight:800}.form-actions{display:flex;gap:10px;margin-top:22px}.form-actions button{border:0}.form-actions .btn-primary{flex:1}.form-actions .btn-secondary{padding-inline:18px}.privacy-note{display:flex;align-items:center;justify-content:center;gap:8px;margin:13px 0 0;color:#7b8d9e;font-size:.64rem;font-weight:700;text-align:center}.privacy-note span{width:8px;height:8px;border-radius:50%;background:#70c8a9}

/* Result */
.material-result{position:sticky;top:76px;overflow:hidden;padding:21px;border-radius:30px}.result-top{align-items:center;margin-bottom:14px}.result-top>span{padding:7px 10px;border-radius:999px;color:#126d56;background:#e9f8f3;font-size:.64rem;font-weight:900}
.result-main{position:relative;overflow:hidden;padding:20px;border-radius:23px;color:#fff;background:radial-gradient(circle at 91% 10%,rgba(237,180,60,.44),transparent 27%),radial-gradient(circle at 7% 100%,rgba(39,197,141,.38),transparent 34%),linear-gradient(135deg,#061d38,#104780 62%,#1b6d77);box-shadow:0 19px 40px rgba(5,34,63,.22)}.result-main::after{content:"";position:absolute;width:150px;height:150px;right:-70px;bottom:-90px;border:1px solid rgba(255,255,255,.14);border-radius:50%}.result-main-label{position:relative;z-index:1;display:flex;justify-content:space-between;align-items:center;gap:12px;color:#c4d8e6;font-size:.65rem;font-weight:850}.result-main-label b{padding:5px 7px;border:1px solid rgba(255,255,255,.18);border-radius:999px;color:#d8f7eb;background:rgba(255,255,255,.09);font-size:.56rem}.result-main output{position:relative;z-index:1;display:block;margin:9px 0 7px;font-size:clamp(3rem,5.5vw,4.35rem);line-height:.9;letter-spacing:-.07em;font-weight:950}.result-main>p{position:relative;z-index:1;margin:0;color:#c8d8e5;font-size:.71rem;line-height:1.55;font-weight:700}.volume-composition{position:relative;z-index:1;display:flex;height:8px;margin-top:16px;border-radius:999px;overflow:hidden;background:rgba(255,255,255,.14)}.volume-composition i{display:block;height:100%;transition:width .25s}.volume-composition i:first-child{background:linear-gradient(90deg,#47d6a5,#43aef2)}.volume-composition i:nth-child(2){background:#a99aeb}.volume-composition i:last-child{background:#f0b43c}.volume-legend{position:relative;z-index:1;display:flex;justify-content:space-between;gap:8px;margin-top:8px;color:#bed0dd;font-size:.54rem;font-weight:700}.volume-legend span{display:flex;align-items:center;gap:4px}.volume-legend i{width:6px;height:6px;border-radius:50%;background:#48cfa2}.volume-legend span:nth-child(2) i{background:#a99aeb}.volume-legend span:nth-child(3) i{background:#f0b43c}
.result-metrics{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}.result-metrics>div,.advanced-result-grid>div{min-width:0;padding:12px;border:1px solid #d9e4ed;border-radius:16px;background:#fbfdff}.result-metrics span,.advanced-result-grid span{display:block;color:#718598;font-size:.58rem;font-weight:850}.result-metrics strong,.advanced-result-grid strong{display:block;margin-top:4px;color:#0b2943;font-size:.91rem;letter-spacing:-.02em;overflow-wrap:anywhere}.result-metrics small,.advanced-result-grid small{display:block;margin-top:3px;color:#899aa8;font-size:.54rem;font-weight:700;line-height:1.35}
.scenario-strip{margin-top:9px;padding:12px;border:1px solid #d9e5ed;border-radius:17px;background:#f6fafc}.scenario-title{display:flex;justify-content:space-between;gap:10px;align-items:center}.scenario-title span{font-size:.66rem;font-weight:900}.scenario-title small{color:#7f91a1;font-size:.55rem;font-weight:700}.scenario-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-top:9px}.scenario-grid>div{padding:7px 3px;border-radius:10px;text-align:center}.scenario-grid span{display:block;color:#7f91a1;font-size:.52rem;font-weight:800}.scenario-grid strong{display:block;margin-top:2px;font-size:.66rem}.scenario-grid .is-current{color:#0c6e56;background:#e7f8f1}.scenario-grid .is-current span{color:#237e68}
.advanced-results{margin-top:9px}.advanced-result-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.advanced-result-grid>div{background:linear-gradient(145deg,#fff,#f7fbfd)}
.result-callout{display:flex;gap:11px;align-items:flex-start;margin-top:9px;padding:13px;border:1px solid #bde3d5;border-radius:18px;background:#effaf6}.result-callout>span{display:grid;place-items:center;width:29px;height:29px;flex:0 0 29px;border-radius:10px;color:#fff;background:linear-gradient(135deg,#15765d,var(--material-mint));font-weight:950}.result-callout strong{font-size:.7rem}.result-callout p{margin:5px 0 0;color:#4b6e63;font-size:.59rem;line-height:1.5;font-weight:700}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:9px}.result-actions a{display:flex;align-items:center;justify-content:center;min-height:38px;padding:8px;border:1px solid #d7e3ec;border-radius:12px;color:#37546c;background:#fff;font-size:.61rem;font-weight:850;text-align:center;text-decoration:none}.result-actions a:hover{border-color:#73cdb0;background:#f0faf6}

/* Content */
.material-section{overflow:hidden;margin-top:26px;padding:clamp(25px,4vw,38px);border-radius:29px}.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.7fr);gap:18px 34px;align-items:end;margin-bottom:22px}.section-head .eyebrow{grid-column:1/-1;margin-bottom:-6px}.section-head h2{margin:0;font-size:clamp(2rem,4vw,3.2rem);line-height:1.02;letter-spacing:-.055em}.section-head>p{margin:0;color:var(--material-copy);line-height:1.65;font-weight:650}
.decision-grid,.method-grid,.mistake-grid,.related-grid,.source-list{display:grid;gap:12px}.decision-grid,.method-grid,.mistake-grid,.source-list{grid-template-columns:repeat(3,minmax(0,1fr))}.related-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.decision-grid article,.method-grid article,.mistake-grid article,.source-card,.related-grid a{padding:19px;border:1px solid #d8e4ed;border-radius:19px;background:#f9fcfe}.decision-grid article>span,.mistake-grid article>span,.method-grid article>span,.source-card>span,.related-grid a>span{display:inline-flex;margin-bottom:11px;padding:6px 8px;border-radius:999px;color:#176e58;background:#e8f8f2;font-size:.6rem;font-weight:900;text-transform:uppercase}.decision-grid h3,.method-grid h3,.mistake-grid h3,.source-card h3{margin:0;font-size:1.01rem}.decision-grid p,.method-grid p,.mistake-grid p,.source-card p{margin:9px 0 0;color:#5b7186;font-size:.79rem;line-height:1.62}.decision-grid .is-featured{color:#fff;border-color:transparent;background:linear-gradient(145deg,#07213d,#0b4b69)}.decision-grid .is-featured>span{color:#baf1dd;background:rgba(39,197,141,.17)}.decision-grid .is-featured p{color:#c0d3df}
.formula-box{margin-top:14px;padding:12px;border:1px solid #c9e2d9;border-radius:13px;color:#195478;background:linear-gradient(120deg,#edf8ff,#effaf5);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.67rem;font-weight:850;line-height:1.5}.breakdown-shell{overflow-x:auto;border:1px solid #d7e3ec;border-radius:18px}.breakdown-table{width:100%;min-width:760px;border-collapse:collapse}.breakdown-table th,.breakdown-table td{padding:12px 14px;border-bottom:1px solid #e0e9ef;text-align:left}.breakdown-table th{color:#637b90;background:#f1f7fa;font-size:.61rem;text-transform:uppercase;letter-spacing:.05em}.breakdown-table td{color:#405d74;font-size:.71rem;font-weight:650;line-height:1.45}.breakdown-table td:nth-child(2){color:#0a3151;font-weight:900}.breakdown-table tr:last-child td{border-bottom:0}
.guide-intro{max-width:980px}.guide-intro h2{margin:0;font-size:clamp(2.15rem,4vw,3.4rem);line-height:1.03;letter-spacing:-.058em}.guide-intro>p:not(.eyebrow){margin:13px 0 0;color:#526b82;font-size:.93rem;line-height:1.78}.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:28px}.guide-card{min-width:0;padding:23px;border:1px solid #d7e4ed;border-radius:21px;background:#fff;box-shadow:0 11px 25px rgba(7,34,62,.045)}.guide-card:nth-child(3n+2){background:linear-gradient(145deg,#fff,#f1fbf7)}.guide-card:nth-child(3n){background:linear-gradient(145deg,#fff,#f1f7ff)}.guide-card h3{margin:8px 0 0;font-size:1.25rem;line-height:1.2;letter-spacing:-.025em}.guide-card p:not(.eyebrow){margin:11px 0 0;color:#48647b;font-size:.84rem;line-height:1.75}.guide-featured{grid-column:1/-1;display:grid;grid-template-columns:.64fr 1.36fr;gap:4px 34px;background:linear-gradient(130deg,#effbf7,#f1f7ff)!important}.guide-featured>.eyebrow,.guide-featured>h3{grid-column:1}.guide-featured>div{grid-column:2;grid-row:1/span 3}.tip-box{margin-top:16px;padding:15px 17px;border-left:4px solid var(--material-mint);border-radius:5px 15px 15px 5px;color:#365f53;background:#fff;line-height:1.6}
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.faq-list details{border:1px solid #d7e3ec;border-radius:16px;background:#fbfdff}.faq-list summary{position:relative;padding:15px 45px 15px 16px;cursor:pointer;font-size:.77rem;font-weight:900;list-style:none}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary::after{content:"+";position:absolute;right:14px;top:50%;translate:0 -50%;display:grid;place-items:center;width:27px;height:27px;border-radius:9px;color:#14765c;background:#e7f8f1}.faq-list details[open] summary::after{content:"–"}.faq-list details>div{padding:0 16px 15px;color:#5c7286;font-size:.75rem;line-height:1.62}
.source-card{display:flex;flex-direction:column}.source-card a{margin-top:auto;padding-top:13px;color:#0e6795;font-size:.73rem;font-weight:900;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}.reviewed-note{margin:18px 0 0;padding:14px 16px;border-left:4px solid var(--material-mint);border-radius:5px 15px 15px 5px;color:#45677b;background:#eef9f5;font-size:.76rem;line-height:1.55}
.related-grid a{display:flex;flex-direction:column;min-height:145px;text-decoration:none;transition:.18s ease}.related-grid a>span{align-self:flex-start}.related-grid strong{margin-top:3px;font-size:.88rem}.related-grid small{margin-top:7px;color:#687e92;font-size:.68rem;line-height:1.45}.related-grid a:hover{transform:translateY(-3px);border-color:#80cdb4;box-shadow:0 13px 24px rgba(7,34,62,.08)}

/* R3: jednodušší Basic a výraznější desktopový hero vizuál */
.material-hero-grid{grid-template-columns:minmax(0,.95fr) minmax(450px,.85fr)}
.material-visual{min-height:590px;padding:27px;border-color:rgba(82,174,212,.34);box-shadow:0 30px 70px rgba(5,37,70,.24),0 0 0 1px rgba(255,255,255,.05) inset}
.material-visual::after{content:"";position:absolute;z-index:0;width:310px;height:310px;right:-105px;top:62px;border-radius:50%;background:radial-gradient(circle,rgba(81,190,255,.2),transparent 67%);filter:blur(3px)}
.material-scene{display:block;min-height:300px;padding-top:45px}
.scene-story{position:absolute;z-index:5;left:0;right:0;top:18px;display:flex;align-items:center;justify-content:center;gap:8px;color:#bfd3e1;font-size:.55rem;font-weight:900;letter-spacing:.04em;text-transform:uppercase}
.scene-story span{display:flex;align-items:center;gap:5px;padding:6px 8px;border:1px solid rgba(255,255,255,.12);border-radius:999px;background:rgba(4,25,47,.55);box-shadow:0 7px 18px rgba(0,0,0,.12)}
.scene-story b{display:grid;place-items:center;width:19px;height:19px;border-radius:50%;color:#06233e;background:#8ce0c1;font-size:.49rem}
.scene-story>i{position:relative;width:18px;height:1px;background:linear-gradient(90deg,rgba(140,224,193,.25),#8ce0c1)}.scene-story>i::after{content:"";position:absolute;right:-1px;top:-2px;width:5px;height:5px;border-top:1px solid #8ce0c1;border-right:1px solid #8ce0c1;transform:rotate(45deg)}
.scene-stage{position:relative;width:min(100%,365px);height:245px;margin:0 auto;perspective:800px}
.scene-route{position:absolute;z-index:0;right:8px;bottom:25px;width:150px;height:45px;border:1px dashed rgba(139,207,235,.34);border-left:0;border-bottom:0;border-radius:0 65px 0 0;transform:rotate(-8deg)}
.scene-route::before{content:"OBJEDNÁVKA";position:absolute;right:5px;top:-18px;color:#8cc7dc;font-size:.46rem;font-weight:950;letter-spacing:.09em}
.scene-stage .material-object{position:absolute;z-index:2;left:20px;top:72px;width:250px;height:128px;border-color:rgba(255,255,255,.68);background:linear-gradient(145deg,rgba(77,180,239,.24),rgba(32,202,139,.42));box-shadow:inset 0 0 0 10px rgba(255,255,255,.04),0 30px 50px rgba(0,0,0,.3);transform:rotateX(58deg) rotateZ(-20deg)}
.scene-stage .material-object::before{border-color:rgba(211,245,236,.66)}
.scene-stage .material-object i{background:repeating-linear-gradient(135deg,rgba(244,190,72,.56) 0 7px,rgba(38,190,137,.24) 7px 14px)}
.material-pile{position:absolute;z-index:4;right:28px;top:82px;width:105px;height:78px;clip-path:polygon(49% 0,78% 22%,100% 100%,0 100%,17% 38%);background:linear-gradient(150deg,#f2c45f,#9a6a30 72%,#654322);filter:drop-shadow(0 18px 17px rgba(0,0,0,.28))}
.material-pile::before,.material-pile::after{content:"";position:absolute;border-radius:50%;background:rgba(255,239,177,.38)}.material-pile::before{width:9px;height:6px;left:28px;top:39px}.material-pile::after{width:6px;height:5px;right:27px;top:48px}.material-pile i{position:absolute;inset:10px 13px;background:repeating-radial-gradient(circle at 30% 40%,rgba(255,255,255,.22) 0 2px,transparent 3px 11px);opacity:.8}
.material-scene[data-material=sand] .material-pile{background:linear-gradient(150deg,#ffe39a,#d7a845 72%,#8f6425)}
.material-scene[data-material=gravel] .material-pile{background:linear-gradient(150deg,#c5d2d9,#718796 72%,#405563)}
.material-scene[data-material=mulch] .material-pile{background:linear-gradient(150deg,#c9894d,#744323 72%,#3e291d)}
.material-scene[data-material=concrete] .material-pile{background:linear-gradient(150deg,#a9c2cf,#627987 72%,#344a58)}
.scene-truck{position:absolute;z-index:6;right:3px;bottom:14px;width:82px;height:38px;border-radius:7px 9px 5px 5px;background:linear-gradient(145deg,#57b9e5,#2373a5);box-shadow:0 11px 18px rgba(0,0,0,.3)}
.scene-truck span{position:absolute;left:-33px;top:7px;width:39px;height:26px;border:2px solid #62d7ad;border-radius:4px;background:linear-gradient(150deg,#0a4255,#17806b);transform:skewY(9deg)}
.scene-truck span::after{content:"";position:absolute;inset:5px 7px;border-top:1px solid rgba(255,255,255,.45);border-bottom:1px solid rgba(255,255,255,.2)}
.scene-truck i,.scene-truck b{position:absolute;bottom:-8px;width:17px;height:17px;border:4px solid #071b2c;border-radius:50%;background:#94b1c2}.scene-truck i{left:10px}.scene-truck b{right:10px}.scene-truck em{position:absolute;right:9px;top:8px;width:21px;height:12px;border-radius:3px;background:rgba(211,242,255,.72);transform:skewX(-8deg)}
.material-scene[data-scene=cylinder] .scene-stage .material-object{width:175px;height:175px;left:45px;top:50px;transform:rotateX(62deg)}
.material-scene[data-scene=trench] .scene-stage .material-object{clip-path:polygon(15% 0,85% 0,100% 100%,0 100%)}
.form-intro{max-width:520px;margin:8px 0 0;color:#667d91;font-size:.75rem;font-weight:650;line-height:1.5}
.basic-start .section-label{margin-top:4px}
.preset-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:0 0 24px}
.preset-row button{display:flex;align-items:center;gap:9px;min-width:0;padding:11px 10px;border:1px solid #d7e4ec;border-radius:15px;color:#3c5970;background:#fbfdff;text-align:left;transition:.17s ease}
.preset-row button:hover,.preset-row button.is-active,.preset-row button[aria-pressed=true]{transform:translateY(-2px);color:#0d7057;border-color:#77cfb3;background:linear-gradient(145deg,#effbf7,#fff);box-shadow:0 9px 18px rgba(7,34,62,.07)}
.preset-row button>span{display:grid;min-width:0}.preset-row strong{color:#173750;font-size:.7rem}.preset-row small{margin-top:2px;color:#7b8e9f;font-size:.55rem;font-weight:700;white-space:nowrap}
.preset-icon{position:relative;display:block;width:26px;height:26px;flex:0 0 26px;border-radius:9px;background:linear-gradient(145deg,#dff7ee,#cde9ff)}.preset-icon::before{content:"";position:absolute;left:6px;right:6px;bottom:6px;height:7px;border-radius:50% 50% 3px 3px;background:#38b88b}.preset-driveway::before{left:5px;right:5px;height:4px;border-radius:2px;background:repeating-linear-gradient(90deg,#70899b 0 3px,#a9bac5 3px 6px)}.preset-sand::before{height:9px;background:#e4b453}.preset-mulch::before{height:10px;background:#9b5e34}
.basic-reserve-note{display:flex;align-items:center;gap:11px;min-width:0;padding:12px 13px;border:1px solid #c9e8dc;border-radius:17px;background:linear-gradient(135deg,#effaf6,#f6fbff)}
.basic-reserve-note>i{display:grid;place-items:center;width:30px;height:30px;flex:0 0 30px;border-radius:10px;color:#fff;background:linear-gradient(135deg,#11775d,var(--material-mint));font-style:normal;font-weight:950}.basic-reserve-note>div{display:grid;gap:3px;min-width:0}.basic-reserve-note strong{font-size:.72rem}.basic-reserve-note small{color:#60798d;font-size:.59rem;font-weight:700;line-height:1.4}.basic-reserve-note button{margin-left:auto;padding:7px 9px;border:1px solid #c9dce7;border-radius:10px;color:#176d83;background:#fff;font-size:.59rem;font-weight:900;cursor:pointer}
.material-pro[data-calculator-mode=basic] .advanced-geometry,.material-pro[data-calculator-mode=basic] .reserve-card,.material-pro[data-calculator-mode=basic] .scenario-strip{display:none}
.material-pro[data-calculator-mode=basic] .material-row{grid-template-columns:minmax(0,.8fr) minmax(280px,1.2fr)}
.material-pro[data-calculator-mode=basic] .volume-legend span:nth-child(2){display:none}
.material-pro[data-calculator-mode=advanced] .basic-start,.material-pro[data-calculator-mode=advanced] .basic-reserve-note{display:none}

/* Footer */
.material-pro .footer{margin-top:60px;padding:48px 0 0;color:#d0deea;background:#061a31}.material-pro .footer-grid{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:40px}.material-pro .footer img{display:block;width:190px}.material-pro .footer p{color:#adbfce;line-height:1.55}.material-pro .footer h3{margin:0 0 12px;color:#fff;font-size:.91rem}.material-pro .footer-links{display:grid;gap:8px}.material-pro .footer-links a{color:#bfd0de;font-size:.77rem;text-decoration:none}.material-pro .footer-links a:hover{color:#fff}.material-pro .footer-bottom{margin-top:32px;padding:17px 0;border-top:1px solid rgba(255,255,255,.12)}.material-pro .footer-bottom p{margin:0;font-size:.71rem}

@media(max-width:1120px){.material-work{grid-template-columns:1fr}.material-result{position:relative;top:auto}.material-pro .footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:1030px){.material-hero-grid{grid-template-columns:1fr .72fr}.material-visual{min-height:500px}.material-object{width:210px;height:115px}.related-grid{grid-template-columns:repeat(2,1fr)}.decision-grid,.method-grid,.mistake-grid{grid-template-columns:1fr 1fr}}
@media(max-width:780px){.material-pro .container{width:min(100% - 24px,1180px)}.material-pro .main-nav,.material-pro .header-cta{display:none}.material-pro .header-inner{min-height:64px}.material-pro .brand-logo img{width:165px}.material-hero{padding:15px 0 12px}.material-hero-grid{display:block}.material-hero-copy{padding:25px 20px;border-radius:27px}.material-visual{display:none}.breadcrumb{margin-bottom:17px}.material-hero h1{max-width:520px;font-size:clamp(2.5rem,11.8vw,4rem)}.material-hero .lead{margin-top:16px;font-size:.9rem;line-height:1.58}.material-mobile-snapshot{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 13px;margin-top:14px;padding:13px 15px;border:1px solid #c9e0e8;border-radius:17px;background:linear-gradient(125deg,#fff,#edfff8)}.material-mobile-snapshot span{color:#56708a;font-size:.66rem;font-weight:900}.material-mobile-snapshot strong{grid-column:2;grid-row:1/span 2;color:var(--material-ink);font-size:1.45rem}.material-mobile-snapshot small{color:#108267;font-size:.65rem;font-weight:850}.material-mobile-snapshot i{grid-column:1/-1;height:5px;margin-top:7px;border-radius:999px;background:#dbe8f2}.material-mobile-snapshot b{display:block;width:67%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--material-mint),var(--material-blue))}.material-hero .hero-actions{margin-top:18px}.material-hero .btn-secondary{display:none}.material-trust{margin-top:15px}.material-trust span{font-size:.59rem}.material-pro .anchor-nav{position:relative;top:auto}.material-work{gap:12px;padding-top:12px}.material-form,.material-result,.material-section{border-radius:23px}.material-form,.material-result{padding:21px 17px}.live-badge{display:none}.mode-switch{margin:17px 0 21px}.shape-picker{grid-template-columns:repeat(2,1fr)}.shape-card{min-height:125px}.field-grid,.shape-panel[data-shape-panel=layer] .field-grid,.shape-panel[data-shape-panel=cylinder] .field-grid,.shape-panel[data-shape-panel=trench] .field-grid,.material-row,.advanced-grid{grid-template-columns:1fr}.reserve-presets{flex-wrap:wrap}.reserve-presets button{min-width:45px}.form-actions{display:grid}.form-actions .btn-primary,.form-actions .btn-secondary{width:100%}.result-main output{font-size:3.2rem}.section-head{grid-template-columns:1fr;gap:10px}.section-head .eyebrow{grid-column:auto;margin-bottom:0}.decision-grid,.method-grid,.mistake-grid,.source-list,.guide-grid,.faq-list{grid-template-columns:1fr}.guide-featured{display:block;grid-column:auto}.guide-card{padding:19px}.material-section{margin-top:16px;padding:23px 18px}.related-grid{grid-template-columns:1fr}.material-pro .footer{margin-top:35px;padding-top:36px}.material-pro .footer-grid{grid-template-columns:1fr;gap:28px}}
@media(max-width:430px){.mode-button{padding:10px 8px;gap:8px}.mode-number{width:28px;height:28px;flex-basis:28px}.mode-button small{font-size:.58rem}.result-metrics,.advanced-result-grid{grid-template-columns:1fr 1fr}.scenario-grid{grid-template-columns:repeat(2,1fr)}.volume-legend{flex-wrap:wrap}.shape-card b{font-size:.75rem}}
@media(max-width:780px){.preset-row{grid-template-columns:1fr 1fr}.preset-row button{padding:10px 9px}.material-pro[data-calculator-mode=basic] .material-row{grid-template-columns:1fr}.basic-reserve-note button{flex:0 0 auto}}
@media(max-width:430px){.preset-row strong{font-size:.66rem}.preset-row small{font-size:.51rem}.preset-icon{width:24px;height:24px;flex-basis:24px}.basic-reserve-note{align-items:flex-start}.basic-reserve-note button{padding:6px 8px}}

/* V7 stability patch: section navigation is intentionally static. */
.material-pro .anchor-nav{position:relative!important;top:auto!important;z-index:auto!important}