.d-hero { position: relative; padding: 96px 0 80px; overflow: hidden; background: radial-gradient(900px 480px at 90% -100px, rgba(13,88,255,0.08), transparent 60%), linear-gradient(180deg, #FBFBF9, var(--paper-2)); border-bottom: 1px solid var(--line); }
.d-hero__inner { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--gutter); display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; }
.d-hero h1 { font-family: var(--font-display); font-weight: 500; font-size: clamp(42px, 6vw, 76px); line-height: 1.02; letter-spacing: -0.030em; color: var(--ink); margin: 18px 0 16px; max-width: 16ch; }
.d-hero h1 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; color: var(--up-blue); }
.d-hero__attribution { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; margin-bottom: 24px; }
.d-hero p { font-size: 18px; line-height: 1.55; color: var(--body); max-width: 540px; margin-bottom: 28px; }
.d-hero__ctas { display: flex; gap: 12px; flex-wrap: wrap; }

.d-feat { padding: 120px 0; border-bottom: 1px solid var(--line); }
.d-feat__inner { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); display: grid; grid-template-columns: 1fr 1.05fr; gap: 80px; align-items: center; }
.d-feat__txt h2 { font-family: var(--font-display); font-weight: 500; font-size: clamp(32px, 4.2vw, 44px); line-height: 1.06; letter-spacing: -0.022em; color: var(--ink); margin-bottom: 18px; max-width: 16ch; }
.d-feat__txt h2 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; color: var(--up-blue); }
.d-feat__txt p { font-size: 17px; line-height: 1.6; color: var(--body); margin-bottom: 18px; max-width: 540px; }
.d-feat__txt ul { list-style: none; display: grid; gap: 16px; max-width: 540px; }
.d-feat__txt ul li { display: grid; grid-template-columns: 20px 1fr; gap: 14px; align-items: start; }
.d-feat__txt ul li svg { width: 18px; height: 18px; color: var(--up-blue); margin-top: 2px; }
.d-feat__txt ul li b { display: block; font-size: 15px; font-weight: 500; color: var(--ink); margin-bottom: 2px; }
.d-feat__txt ul li span { font-size: 14px; color: var(--muted); line-height: 1.55; }

.d-review { background: var(--white); border: 1px solid var(--line); border-radius: var(--r-4); padding: 28px; box-shadow: var(--shadow-md); }
.d-review__head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.d-review__head h4 { font-size: 14px; font-weight: 500; color: var(--ink); }
.d-review__head .meta { font-family: var(--font-mono); font-size: 11px; color: var(--up-blue); background: var(--up-blue-50); padding: 4px 10px; border-radius: var(--r-pill); letter-spacing: 0.06em; }
.d-review h6 { font-size: 13px; font-weight: 500; color: var(--ink); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.d-review h6::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--pos); box-shadow: 0 0 0 3px rgba(19,124,61,0.15); }
.d-review .check { display: grid; grid-template-columns: 18px 1fr auto; gap: 10px; font-size: 13px; padding: 10px 0; border-top: 1px solid var(--line-2); align-items: center; }
.d-review .check:first-of-type { border-top: 0; }
.d-review .check .ic { color: var(--pos); font-weight: 600; }
.d-review .check .ic.warn { color: var(--warn); }
.d-review .check .n { color: var(--ink-2); }
.d-review .check .s { font-family: var(--font-mono); font-size: 11px; color: var(--muted); }

@media (max-width: 1024px) {
  .d-hero__inner, .d-feat__inner { grid-template-columns: 1fr; gap: 40px; }
}

.d-flow { background: var(--white); border: 1px solid var(--line); border-radius: var(--r-4); padding: 28px; box-shadow: var(--shadow-md); }
.d-flow__head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.d-flow__head h4 { font-size: 14px; font-weight: 500; color: var(--ink); }
.d-flow__head .meta { font-family: var(--font-mono); font-size: 11px; color: var(--pos); background: var(--pos-soft); padding: 4px 10px; border-radius: var(--r-pill); letter-spacing: 0.06em; }
.d-flow__step { display: grid; grid-template-columns: 36px 1fr; gap: 14px; padding: 12px 0; border-top: 1px solid var(--line-2); align-items: start; }
.d-flow__step:first-of-type { border-top: 0; padding-top: 0; }
.d-flow__step.is-final .n { background: var(--pos); color: var(--white); }
.d-flow__step .n { width: 28px; height: 28px; display: grid; place-items: center; background: var(--up-blue-50); color: var(--up-blue); border-radius: 50%; font-family: var(--font-mono); font-size: 12px; font-weight: 500; flex-shrink: 0; margin-top: 2px; }
.d-flow__step h5 { font-family: var(--font-display); font-weight: 500; font-size: 15px; color: var(--ink); letter-spacing: -0.01em; margin-bottom: 4px; }
.d-flow__step p { font-size: 13px; color: var(--muted); margin: 0; line-height: 1.55; }


.d-chat { padding: 120px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper-2); }
.d-chat__inner { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); display: grid; grid-template-columns: 1fr 1.15fr; gap: 64px; align-items: start; }
.d-chat__txt h2 { font-family: var(--font-display); font-weight: 500; font-size: clamp(32px, 4.2vw, 44px); line-height: 1.06; letter-spacing: -0.022em; color: var(--ink); margin-bottom: 18px; max-width: 16ch; }
.d-chat__txt h2 em { font-family: var(--font-serif); font-style: italic; font-weight: 400; color: var(--up-blue); }
.d-chat__txt p { font-size: 17px; line-height: 1.6; color: var(--body); max-width: 540px; }

.d-chat__vis { display: flex; flex-direction: column; gap: 16px; }

.d-drop { background: var(--white); border: 2px dashed var(--up-blue-200); border-radius: var(--r-3); padding: 20px 24px; }
.d-drop__head { display: flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--up-blue); margin-bottom: 14px; }
.d-drop__head .ic { width: 22px; height: 22px; display: grid; place-items: center; background: var(--up-blue-50); color: var(--up-blue); border-radius: 50%; font-size: 12px; }
.d-drop__files { display: flex; flex-direction: column; gap: 8px; }
.d-drop__file { display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: center; padding: 10px 14px; background: var(--paper-2); border-radius: var(--r-2); font-size: 13px; }
.d-drop__file .ic { width: 28px; height: 28px; display: grid; place-items: center; font-size: 16px; }
.d-drop__file .n { color: var(--ink); font-weight: 500; }
.d-drop__file .meta { display: block; font-family: var(--font-mono); font-size: 10px; color: var(--muted); margin-top: 2px; letter-spacing: 0.04em; font-weight: 400; }

.d-thread { background: var(--white); border: 1px solid var(--line); border-radius: var(--r-4); padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.d-msg { padding: 12px 14px; border-radius: var(--r-3); max-width: 92%; }
.d-msg .who { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); display: block; margin-bottom: 6px; }
.d-msg p { font-size: 14px; line-height: 1.5; color: var(--ink); margin: 0; }
.d-msg p b { color: var(--ink); font-weight: 500; }
.d-msg--ai { background: var(--up-blue-50); align-self: flex-start; border-bottom-left-radius: var(--r-1); }
.d-msg--ai .who { color: var(--up-blue); }
.d-msg--agent { background: var(--ink); color: var(--white); align-self: flex-end; border-bottom-right-radius: var(--r-1); }
.d-msg--agent .who { color: var(--up-blue-100); }
.d-msg--agent p { color: var(--d-text); }
.d-msg--system { background: var(--paper-2); align-self: center; max-width: 100%; padding: 8px 14px; }
.d-msg--system .who { color: var(--pos); margin-bottom: 4px; }
.d-msg--system p { font-size: 12px; color: var(--muted); }

@media (max-width: 1024px) {
  .d-chat__inner { grid-template-columns: 1fr; gap: 40px; }
}