@font-face {
  font-family: Iran;
  src: url("../assets/iran-font.woff") format("woff");
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: #172e3d;
  --muted: #49616d;
  --red: #c52c43;
  --red-hover: #a92339;
  --line: #dce5e8;
  --light: #f3f7f8;
  --paper: #fff;
  --navy: #122431;
  --teal: #70e7e8;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 88px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.95 Iran, Tahoma, sans-serif; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid #287da0; outline-offset: 4px; }
h1, h2, h3, p, figure { margin: 0; }
.wrap { width: min(1200px, calc(100% - 72px)); margin-inline: auto; }
.skip { position: fixed; inset-inline-start: 16px; top: -100px; z-index: 20; background: white; padding: 8px 16px; }
.skip:focus { top: 12px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--paper); position: relative; z-index: 4; }
.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; flex-shrink: 0; min-height: 52px; }
.brand img { display: block; width: 138px; height: auto; }
#navigation { display: flex; align-items: center; gap: 26px; font-size: .84rem; }
#navigation > a, .course-menu > summary { display: flex; gap: 6px; align-items: center; min-height: 48px; white-space: nowrap; }
#navigation a:hover, .course-menu > summary:hover, [aria-current="page"] { color: var(--red); }
.course-menu { position: relative; }
summary { cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
.course-links { position: absolute; top: 100%; inset-inline-start: -16px; min-width: 235px; padding: 8px; background: white; border: 1px solid var(--line); box-shadow: 0 12px 28px #172e3d14; }
.course-links a { display: flex; align-items: center; padding: 8px 12px; min-height: 44px; }
.course-links a:hover { background: var(--light); }
.menu-toggle { display: none; }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 49px; border-radius: 4px; padding: 7px 19px; font-size: .88rem; font-weight: 700; white-space: nowrap; transition: background .18s ease, color .18s ease; }
.button span { font-size: 1.13em; }
.button-outline { border: 1px solid #cdd9de; color: var(--ink); }
.button-outline:hover, .button-plain:hover { background: var(--light); }
.button-red { background: var(--red); color: white; }
.button-red:hover { background: var(--red-hover); }
.button-plain { border: 1px solid transparent; }
.breadcrumb { display: flex; align-items: center; gap: 12px; padding-block: 26px 10px; color: var(--muted); font-size: .76rem; }
.hero { display: grid; grid-template-columns: .91fr 1.09fr; gap: clamp(28px, 5vw, 82px); align-items: center; padding-block: 24px 54px; }
.eyebrow { font-weight: 700; font-size: .82rem; color: var(--red); display: flex; align-items: center; gap: 8px; }
.eyebrow::before { content: ""; display: inline-block; width: 15px; height: 2px; background: currentColor; flex: 0 0 15px; }
h1 { margin-block: 15px 5px; font-size: clamp(2.5rem, 4.35vw, 4.25rem); line-height: 1.25; letter-spacing: -.055em; }
.hero-line { font-size: clamp(1.48rem, 3.3vw, 3.05rem); font-weight: 700; line-height: 1.52; letter-spacing: -.035em; }
.hero-line em { font-style: normal; color: var(--red); }
.lead { color: var(--muted); max-width: 42ch; margin-block: 19px 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.teacher { display: flex; align-items: center; gap: 11px; margin-top: 26px; }
.teacher-icon { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--line); background: var(--light); border-radius: 50%; }
.teacher-icon svg, .menu-toggle svg { width: 20px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; }
.teacher small, .instructor small { display: block; color: var(--muted); font-size: .72rem; }
.teacher strong { font-size: .93rem; }

.cam { min-width: 0; color: #e8f3f7; background: var(--navy); border: 1px solid #36515f; border-radius: 7px; overflow: hidden; box-shadow: 0 20px 40px #172e3d13; }
.cam-title { min-height: 46px; border-bottom: 1px solid #39515e; padding-inline: 17px; display: flex; gap: 8px; align-items: center; justify-content: space-between; font: 11px/1.3 Consolas, monospace; letter-spacing: .12em; }
.cam-title i { display: inline-block; width: 7px; height: 7px; margin-inline-end: 8px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 12px #70e7e875; }
.cam-title-accent { color: var(--teal); }
.part-visual { display: block; width: 100%; height: auto; }
.paths { display: none; }
.cam[data-mode="rough"] .rough-path, .cam[data-mode="finish"] .finish-path, .cam[data-mode="speed"] .speed-path { display: block; }
.cam-bottom { border-top: 1px solid #39515e; padding: 10px 12px 12px; }
.cam-controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.cam-controls button { border: 1px solid #415d6a; min-height: 44px; padding: 4px 6px; background: #1c3442; color: #dfeef4; border-radius: 3px; font-size: .78rem; }
.cam-controls button:hover { background: #264552; }
.cam-controls button[aria-pressed="true"] { color: #c3fbf7; background: #234a52; border-color: #68c5c9; }
.cam-controls button:focus-visible { outline-color: var(--teal); }
.cam figcaption { text-align: center; color: #b4cdd7; font-size: .7rem; margin-top: 7px; }

.section-nav { border-block: 1px solid var(--line); background: var(--light); }
.section-nav > div { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 30px; }
.section-nav a { display: inline-flex; align-items: center; min-height: 50px; font-weight: 700; font-size: .85rem; }
.section-nav a:hover { color: var(--red); }
.section { padding-block: 64px; }
.section-title { margin-bottom: 26px; }
.section-title h2, .enroll h2 { margin-block: 7px 8px; font-size: clamp(1.68rem, 3vw, 2.52rem); line-height: 1.5; letter-spacing: -.03em; }
.section-title > p:last-child, .enroll-info > p:not(.eyebrow) { color: var(--muted); max-width: 65ch; }
.syllabus-grid, .workflow-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 15px; }
.syllabus-card { border: 1px solid var(--line); border-top: 2px solid var(--red); border-radius: 4px; padding: 19px 17px; }
.index { color: var(--red); font-weight: 700; font-size: .83rem; }
.syllabus-card h3, .workflow-grid h3 { font-size: 1.04rem; margin-top: 8px; }
.syllabus-card ul, .strategy-body ul { padding-inline-start: 20px; margin-block: 8px 0; color: var(--muted); font-size: .9rem; }
.syllabus-card li + li, .strategy-body li + li { margin-top: 5px; }
.syllabus-card li::marker, .strategy-body li::marker { color: var(--red); }

.workflow-band { background: var(--light); border-block: 1px solid var(--line); }
.workflow-grid { list-style: none; padding: 0; margin: 0; }
.workflow-grid li { border-top: 1px solid #a8bcc6; padding: 13px 0 0 12px; }
.workflow-grid p { margin-top: 5px; font-size: .9rem; color: var(--muted); }
.source-links { display: flex; flex-wrap: wrap; gap: 5px 24px; margin-top: 18px; }
.source-links a { min-height: 44px; display: inline-flex; align-items: center; color: #285674; font-size: .84rem; }
.source-links a:hover { text-decoration: underline; }
.strategy-section { display: grid; grid-template-columns: .79fr 1.21fr; align-items: start; gap: 60px; }
.strategy-list { border-top: 1px solid var(--line); }
.strategy-list details { border-bottom: 1px solid var(--line); }
.strategy-list summary { min-height: 62px; display: grid; grid-template-columns: 26px minmax(0, 1fr) auto 12px; gap: 10px; align-items: center; font-weight: 700; }
.strategy-list summary small { color: var(--muted); font: 10px Consolas, monospace; letter-spacing: .06em; }
.strategy-list summary i { display: block; width: 8px; height: 8px; border-right: 1px solid var(--red); border-bottom: 1px solid var(--red); transform: rotate(45deg); }
.strategy-list details[open] summary i { transform: rotate(225deg); }
.strategy-body { padding: 0 36px 21px 12px; }
.strategy-body p { color: var(--muted); }

.enroll { display: grid; grid-template-columns: 1fr .73fr; gap: 55px; border-top: 1px solid var(--line); }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-block: 19px 24px; }
.tags span { padding: 3px 10px; border: 1px solid var(--line); background: var(--light); border-radius: 3px; font-size: .82rem; }
.instructor strong { font-size: 1.17rem; }
.enroll-card { background: var(--navy); color: white; border-radius: 5px; padding: clamp(22px, 4vw, 37px); align-self: start; }
.enroll-card .eyebrow { color: var(--teal); }
.enroll-card h3 { margin-block: 10px 7px; font-size: 1.42rem; }
.enroll-card > p:not(.eyebrow) { color: #c3d5dd; margin-bottom: 20px; }
.site-footer { background: var(--light); border-top: 1px solid var(--line); }
.site-footer > div { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding-block: 20px; font-size: .83rem; }

.concept-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 15px; }
.concept-grid article { border: 1px solid var(--line); border-radius: 4px; padding: 19px 17px; }
.concept-grid h3, .example-steps h3 { font-size: 1.04rem; }
.concept-grid p, .example-steps p { margin-top: 7px; font-size: .9rem; color: var(--muted); }
.glossary-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.glossary-grid bdi { color: var(--muted); font-size: .8em; }
.workflow-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 25px; }
.example-band { background: var(--light); border-block: 1px solid var(--line); }
.example-layout { display: grid; grid-template-columns: .79fr 1.21fr; gap: 60px; }
.example-steps { margin: 0; padding-inline-start: 1.5em; }
.example-steps li { padding-inline-start: 8px; }
.example-steps li + li { margin-top: 16px; }
.example-steps li::marker { color: var(--red); font-weight: 700; }
.faq-list summary { grid-template-columns: minmax(0, 1fr) 12px; }
.faq-list details > p { padding: 0 0 17px 20px; color: var(--muted); }
.reference-section { padding-block: 22px 36px; border-top: 1px solid var(--line); }
.reference-section h2 { font-size: 1.2rem; }
.reference-section .source-links { margin-top: 4px; }

@media (max-width: 980px) {
  .wrap { width: calc(100% - 48px); }
  #navigation { gap: 14px; }
  .header-inner { gap: 13px; }
  .header-cta { padding-inline: 10px; }
  .hero { gap: 24px; }
  .syllabus-grid, .workflow-grid, .concept-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .strategy-section, .enroll, .example-layout { gap: 28px; }
}
@media (max-width: 760px) {
  .wrap { width: calc(100% - 32px); }
  .header-inner { min-height: 66px; }
  .brand img { width: 116px; }
  .header-cta { display: none; }
  .menu-toggle { display: flex; align-items: center; gap: 7px; padding: 4px 8px; min-height: 44px; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: white; font-size: .83rem; }
  #navigation { display: none; position: absolute; top: 100%; inset-inline: 0; padding: 8px 16px 16px; background: white; border-bottom: 1px solid var(--line); box-shadow: 0 10px 16px #172e3d12; }
  #navigation.is-open { display: block; }
  .course-links { position: static; box-shadow: none; background: var(--light); }
  .hero, .strategy-section, .enroll, .example-layout { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-top: 13px; padding-bottom: 32px; gap: 25px; }
  .breadcrumb { padding-block: 16px 8px; }
  h1 { font-size: clamp(2.35rem, 8.9vw, 3.5rem); }
  .hero-line { font-size: clamp(1.6rem, 7.7vw, 2.65rem); }
  .hero-line br { display: none; }
  .lead { margin-block: 12px 18px; }
  .teacher { margin-top: 18px; }
  .section-nav > div { gap: 0 15px; }
  .section-nav a { min-height: 46px; }
  .section { padding-block: 39px; }
  .strategy-section .section-title { margin-bottom: 0; }
}
@media (max-width: 460px) {
  .syllabus-grid, .concept-grid { grid-template-columns: 1fr; gap: 10px; }
  .hero-actions .button { padding-inline: 13px; gap: 8px; }
  .workflow-grid { gap: 13px; }
  .cam-title { padding-inline: 10px; font-size: 9px; min-height: 39px; }
  .cam-title i { margin-inline-end: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; }
}