/* ============================================================
   SECTIONS — hero, about, instructors, stories, courses,
   video, topics, contact, footer + responsive
   ============================================================ */

/* ---------------- HERO ---------------- */
.hero {
  min-height: 100svh;
  display: flex; align-items: center;
  padding-top: calc(var(--nav-h) + 2rem);
  overflow: hidden;
}
#netCanvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: auto;
}
.hero::after {
  content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(90deg, rgba(5, 8, 15, 0.88) 0%, rgba(5, 8, 15, 0.55) 46%, rgba(5, 8, 15, 0.05) 100%);
}
.hero .container { position: relative; z-index: 2; width: 100%; }
.hero-content { max-width: 640px; pointer-events: none; }
.hero-content a, .hero-content button { pointer-events: auto; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.1em; color: var(--net-green);
  border: 1px solid rgba(34, 229, 132, 0.3);
  background: rgba(34, 229, 132, 0.06);
  padding: 0.5em 1.15em; border-radius: 100px;
  margin-bottom: 1.4rem;
}
.hero-badge::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--net-green); box-shadow: 0 0 10px var(--net-green);
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero-cli {
  font-family: var(--font-mono); font-size: clamp(0.8rem, 2.2vw, 0.95rem);
  color: var(--text-2); margin-bottom: 1rem; min-height: 1.6em;
}
.hero-cli .t-prompt { color: var(--net-green); }
.hero-cli .cursor {
  display: inline-block; width: 0.55em; height: 1.1em;
  background: var(--net-green); vertical-align: text-bottom;
  animation: blink 1s step-start infinite;
}

.hero h1 {
  font-size: clamp(2.4rem, 6.4vw, 4.3rem);
  font-weight: 700; margin-bottom: 1.3rem;
}
.hero h1 .accent {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero-desc { color: var(--text-2); font-size: clamp(1rem, 2.1vw, 1.15rem); max-width: 540px; margin-bottom: 2.2rem; }

.hero-stats { display: flex; gap: clamp(1.4rem, 4vw, 3rem); margin-bottom: 2.4rem; }
.stat-item { position: relative; }
.stat-number {
  font-family: var(--font-display); font-size: clamp(1.9rem, 4.5vw, 2.7rem);
  font-weight: 700; color: var(--net-blue-light); line-height: 1.1;
}
.stat-number .suffix { color: var(--net-green); }
.stat-label { font-size: 0.82rem; color: var(--text-3); margin-top: 0.2rem; max-width: 130px; }

.hero-buttons { display: flex; flex-wrap: wrap; gap: 0.9rem; }

.hero-scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  z-index: 2; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em;
  color: var(--text-3); text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
}
.hero-scroll::after {
  content: ''; width: 1px; height: 34px;
  background: linear-gradient(180deg, var(--net-blue), transparent);
  animation: scroll-drip 1.8s ease-in-out infinite;
}

/* ---------------- ABOUT ---------------- */
.about-grid {
  display: grid; grid-template-columns: 1.25fr 1fr;
  gap: clamp(1.6rem, 4vw, 3.4rem); align-items: start;
}
.features-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.feature-card { padding: 1.5rem 1.4rem; }
.feature-card .f-icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(4, 159, 217, 0.1); color: var(--net-blue-light);
  border: 1px solid var(--stroke);
  margin-bottom: 1rem;
}
.feature-card .f-icon svg { width: 24px; height: 24px; }
.feature-card h4 { font-size: 1.02rem; margin-bottom: 0.45rem; }
.feature-card p { font-size: 0.87rem; color: var(--text-2); }

.slogan-panel {
  position: sticky; top: calc(var(--nav-h) + 1.5rem);
  padding: 2rem 1.8rem;
  border-left: 3px solid var(--net-blue);
}
.slogan-panel .sp-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--text-3); text-transform: uppercase; }
.slogan-panel blockquote {
  font-family: var(--font-display); font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-weight: 600; font-style: italic; line-height: 1.4;
  color: var(--net-blue-light); margin: 0.9rem 0 1.1rem;
}
.slogan-panel p { color: var(--text-2); font-size: 0.93rem; }

/* ---------------- INSTRUKTORLAR ---------------- */
.instructors-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 460px));
  justify-content: center; gap: clamp(1.4rem, 3.5vw, 2.4rem);
}
.instructor-card { overflow: hidden; }
.instructor-photo { position: relative; aspect-ratio: 5 / 4.4; overflow: hidden; }
.instructor-photo img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 0.6s var(--ease-out); }
.instructor-card:hover .instructor-photo img { transform: scale(1.045); }
.instructor-photo::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(5, 8, 15, 0.92) 100%);
}
.instructor-whois {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--net-green);
  background: rgba(5, 9, 15, 0.72); border: 1px solid rgba(34, 229, 132, 0.3);
  padding: 0.4em 0.9em; border-radius: 6px;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.instructor-exp {
  position: absolute; bottom: 14px; right: 14px; z-index: 2;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-1);
  background: rgba(5, 9, 15, 0.72); border: 1px solid var(--stroke);
  padding: 0.4em 0.9em; border-radius: 6px;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.instructor-body { padding: 1.4rem 1.5rem 1.6rem; }
.instructor-body h3 { font-size: 1.3rem; }
.instructor-role { color: var(--net-blue-light); font-size: 0.88rem; margin: 0.2rem 0 1rem; }
.cert-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.2rem; }
.cert-pill {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700;
  color: var(--net-blue-light);
  border: 1px solid var(--stroke-strong); border-radius: 100px;
  padding: 0.4em 1em;
  transition: all var(--t-fast);
  display: inline-flex; align-items: center; gap: 0.45em;
}
.cert-pill::after { content: '↗'; font-size: 0.85em; opacity: 0.7; }
.cert-pill:hover { background: var(--net-blue); color: #fff; border-color: var(--net-blue); box-shadow: var(--shadow-glow-blue); }
.instructor-contact { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.contact-pill {
  flex: 1; min-width: 150px; text-align: center;
  font-size: 0.85rem; font-weight: 600;
  border: 1px solid var(--stroke-soft); border-radius: var(--radius-s);
  padding: 0.65em 1em; color: var(--text-2);
  transition: all var(--t-fast);
}
.contact-pill:hover { color: var(--text-1); border-color: var(--net-blue); background: rgba(4, 159, 217, 0.08); }

/* ---------------- SUCCESS STORIES ---------------- */
.stories-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.3rem;
}
.story-card { display: flex; flex-direction: column; padding: 1.5rem 1.4rem 1.3rem; overflow: hidden; }
.story-card::before {
  content: 'LINK ESTABLISHED'; position: absolute; top: 0; left: 50%; transform: translate(-50%, -100%);
  font-family: var(--font-mono); font-size: 0.58rem; font-weight: 700; letter-spacing: 0.22em;
  color: var(--net-green); background: rgba(34, 229, 132, 0.1);
  border: 1px solid rgba(34, 229, 132, 0.35); border-top: none;
  border-radius: 0 0 8px 8px; padding: 0.3em 1em;
  transition: transform 0.3s var(--ease-out);
}
.story-card:hover::before { transform: translate(-50%, 0); }
.story-card:hover { border-color: rgba(34, 229, 132, 0.4); box-shadow: var(--shadow-card), var(--shadow-glow-green); }

.story-head { text-align: center; position: relative; }
.role-tag {
  position: absolute; top: -0.4rem; right: -0.3rem;
  font-family: var(--font-mono); font-size: 0.6rem; font-weight: 700; letter-spacing: 0.1em;
  padding: 0.35em 0.9em; border-radius: 100px; text-transform: uppercase;
}
.role-tag.student { color: var(--net-blue-light); background: rgba(4, 159, 217, 0.12); border: 1px solid var(--stroke-strong); }
.role-tag.instructor { color: var(--net-gold); background: rgba(232, 184, 48, 0.1); border: 1px solid rgba(232, 184, 48, 0.4); }

.story-avatar {
  width: 88px; height: 88px; margin: 0 auto 0.9rem;
  border-radius: 50%; padding: 3px;
  background: conic-gradient(from 140deg, var(--net-blue), var(--net-green), var(--net-blue));
}
.story-avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; object-position: center 20%; border: 3px solid var(--bg-1); }
.story-card h3 { font-size: 1.08rem; }

.cert-tag {
  display: inline-flex; align-items: center; gap: 0.45em;
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  padding: 0.4em 1em; border-radius: 100px; margin-top: 0.5rem;
}
.cert-tag::before { content: '✓'; font-weight: 900; }
.cert-tag.ccna { color: var(--net-blue-light); background: rgba(4, 159, 217, 0.1); border: 1px solid var(--stroke-strong); }
.cert-tag.ccnp { color: var(--net-gold); background: rgba(232, 184, 48, 0.08); border: 1px solid rgba(232, 184, 48, 0.4); }
.cert-tag.cyberops { color: var(--net-green); background: rgba(34, 229, 132, 0.08); border: 1px solid rgba(34, 229, 132, 0.4); }

.story-meta {
  display: flex; justify-content: center; gap: 0.9rem; margin-top: 0.55rem;
  font-size: 0.78rem; color: var(--text-3); font-family: var(--font-mono);
}

.story-details { flex: 1; margin: 1.1rem 0 1.2rem; display: flex; flex-direction: column; gap: 0.7rem; }
.story-detail { display: flex; gap: 0.7rem; align-items: flex-start; }
.story-detail svg { width: 17px; height: 17px; flex-shrink: 0; margin-top: 2px; color: var(--net-blue); }
.story-detail .sd-label {
  display: block; font-family: var(--font-mono); font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.12em; color: var(--text-3);
}
.story-detail .sd-value { display: block; font-size: 0.84rem; color: var(--text-1); line-height: 1.4; }

.story-actions { display: flex; gap: 0.6rem; }
.story-btn {
  flex: 1; text-align: center; font-size: 0.83rem; font-weight: 600;
  padding: 0.6em 0.9em; border-radius: var(--radius-s);
  transition: all var(--t-fast);
}
.story-btn.tg { color: var(--text-2); border: 1px solid var(--stroke-soft); }
.story-btn.tg:hover { color: var(--text-1); border-color: var(--net-blue); background: rgba(4, 159, 217, 0.08); }
.story-btn.verify {
  color: var(--net-green); border: 1px solid rgba(34, 229, 132, 0.4);
  background: rgba(34, 229, 132, 0.06);
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4em;
}
.story-btn.verify::before { content: '🛡'; font-size: 0.9em; }
.story-btn.verify:hover { background: var(--net-green-dim); color: #04140c; border-color: transparent; }

.stories-more { text-align: center; margin-top: 2.4rem; }
.story-card.hidden { display: none; }

/* ---------------- KURSLAR ---------------- */
.courses-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.4rem; align-items: stretch;
}
.course-card { display: flex; flex-direction: column; padding: 1.7rem 1.6rem; }
.course-card.featured {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
    linear-gradient(120deg, rgba(249, 115, 22, 0.85), rgba(220, 38, 38, 0.35), rgba(249, 115, 22, 0.85)) border-box;
  background-size: 100% 100%, 300% 100%;
  animation: border-flow 5s linear infinite;
}
.course-card.featured:hover { transform: translateY(-4px); box-shadow: var(--shadow-card), 0 0 46px rgba(249, 115, 22, 0.2); }

.course-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.course-icon {
  width: 52px; height: 52px; border-radius: 13px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; color: #fff;
}
.course-icon svg { width: 26px; height: 26px; }
.course-badge {
  font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.1em;
  color: #fff; padding: 0.45em 1em; border-radius: 100px; text-transform: uppercase;
  white-space: nowrap;
}
.course-card h3 { font-size: 1.35rem; margin-bottom: 0.2rem; }
.course-subtitle { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; margin-bottom: 0.8rem; display: block; }
.course-desc { color: var(--text-2); font-size: 0.92rem; margin-bottom: 1.2rem; }
.course-features { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 1.4rem; }
.course-features li { display: flex; gap: 0.6rem; font-size: 0.88rem; color: var(--text-2); align-items: flex-start; }
.course-features li::before {
  content: '✓'; flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.65rem; font-weight: 900; margin-top: 2px;
  background: rgba(4, 159, 217, 0.14); color: var(--net-blue-light);
}
.course-card[data-accent="green"] .course-features li::before { background: rgba(34, 229, 132, 0.12); color: var(--net-green); }
.course-card[data-accent="orange"] .course-features li::before { background: rgba(249, 115, 22, 0.14); color: var(--net-orange); }
.course-card[data-accent="gold"] .course-features li::before { background: rgba(232, 184, 48, 0.12); color: var(--net-gold); }
.course-card[data-accent="indigo"] .course-features li::before { background: rgba(129, 140, 248, 0.14); color: var(--net-indigo); }

.course-bottom { margin-top: auto; }
.course-price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 0.4rem; }
.price-current { font-family: var(--font-display); font-size: 1.75rem; font-weight: 700; }
.price-original { color: var(--text-3); text-decoration: line-through; font-size: 0.95rem; }
.price-period { color: var(--text-3); font-size: 0.85rem; }
.price-free { font-family: var(--font-display); font-size: 1.75rem; font-weight: 700; color: var(--net-green); }
.price-extras { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.9rem; }
.price-extra {
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-2);
  border: 1px dashed var(--stroke-soft); border-radius: 7px; padding: 0.35em 0.8em;
}
.course-urgency {
  font-family: var(--font-mono); font-size: 0.74rem; font-weight: 700;
  color: var(--net-orange); margin-bottom: 0.9rem;
  display: inline-flex; align-items: center; gap: 0.5em;
}
.course-urgency::before { content: '⏰'; }
.course-actions { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.course-actions .btn { flex: 1; min-width: 150px; font-size: 0.92rem; padding: 0.75em 1.2em; }
.btn-detail { background: transparent; color: var(--text-2); border: 1px solid var(--stroke-soft); }
.btn-detail:hover { color: var(--text-1); border-color: var(--stroke-strong); }

/* accent tugmalar */
.btn-accent-orange { background: var(--grad-orange); color: #fff; box-shadow: 0 10px 26px -8px rgba(249, 115, 22, 0.5); }
.btn-accent-green  { background: var(--grad-green); color: #04140c; box-shadow: 0 10px 26px -8px rgba(34, 229, 132, 0.4); }
.btn-accent-indigo { background: var(--grad-indigo); color: #fff; box-shadow: 0 10px 26px -8px rgba(99, 102, 241, 0.5); }
.btn-accent-cyan   { background: var(--grad-cyan); color: #fff; box-shadow: 0 10px 26px -8px rgba(34, 211, 238, 0.4); }
.btn-accent-gold   { background: var(--grad-gold); color: #14100a; box-shadow: 0 10px 26px -8px rgba(232, 184, 48, 0.4); }
.btn-accent-blue   { background: var(--grad-blue); color: #fff; box-shadow: 0 10px 26px -8px rgba(4, 159, 217, 0.55); }

.icon-orange { background: var(--grad-orange); }
.icon-green  { background: var(--grad-green); }
.icon-indigo { background: var(--grad-indigo); }
.icon-cyan   { background: var(--grad-cyan); }
.icon-gold   { background: var(--grad-gold); }
.icon-blue   { background: var(--grad-blue); }
.badge-orange { background: var(--grad-orange); }
.badge-green  { background: var(--grad-green); color: #04140c; }
.badge-indigo { background: var(--grad-indigo); }
.badge-gold   { background: var(--grad-gold); color: #14100a; }

/* ---------------- VIDEO KURS ---------------- */
.video-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem; margin-bottom: 2.6rem;
}
.video-stat { text-align: center; padding: 1.35rem 0.8rem; }
.video-stat .vs-num {
  font-family: var(--font-display); font-size: 2rem; font-weight: 700;
  color: var(--net-blue-light);
}
.video-stat .vs-label { font-size: 0.78rem; color: var(--text-3); margin-top: 0.2rem; }

.modules-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1.1rem; margin-bottom: 2.6rem; }
.vmodule-card { padding: 1.5rem 1.4rem; }
.vmodule-num { font-family: var(--font-mono); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.16em; color: var(--net-gold); }
.vmodule-card h3 { font-size: 1.08rem; margin: 0.5rem 0 0.9rem; }
.vmodule-info { display: flex; flex-direction: column; gap: 0.4rem; font-size: 0.82rem; color: var(--text-2); }
.vmodule-info span { display: inline-flex; align-items: center; gap: 0.5em; }
.vmodule-info svg { width: 15px; height: 15px; color: var(--net-blue); }
.video-cta { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* ---------------- KURS MAVZULARI ---------------- */
.topics-title { text-align: center; margin-bottom: 2.2rem; font-size: clamp(1.3rem, 2.8vw, 1.7rem); }
.topics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.3rem; }
.topics-col { padding: 1.5rem 1.35rem; }
.topics-col h3 {
  font-size: 0.98rem; margin-bottom: 1.1rem; padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--stroke-soft);
}
.topics-list { display: flex; flex-direction: column; }
.topic-item {
  display: flex; align-items: center; gap: 0.7rem;
  font-size: 0.86rem; color: var(--text-2);
  padding: 0.5em 0.6em; border-radius: 8px;
  cursor: pointer; border: 1px solid transparent;
  transition: all var(--t-fast);
}
.topic-item:hover {
  color: var(--text-1); background: rgba(4, 159, 217, 0.07);
  border-color: var(--stroke); transform: translateX(4px);
}
.topic-item .tn {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  color: var(--net-blue); min-width: 2em; text-align: right;
}
.topic-item::after { content: '›'; margin-left: auto; color: var(--text-3); opacity: 0; transition: opacity var(--t-fast); }
.topic-item:hover::after { opacity: 1; }

.coming-soon { grid-column: 1 / -1; text-align: center; padding: 4rem 2rem; color: var(--text-2); }
.coming-soon svg { width: 74px; height: 74px; color: var(--net-blue); margin: 0 auto 1.4rem; }
.coming-soon h3 { color: var(--text-1); font-size: 1.7rem; margin-bottom: 0.7rem; }

/* ---------------- CONTACT ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(1.6rem, 4vw, 3rem); align-items: start; }
.contact-info h3 { font-size: 1.25rem; margin-bottom: 1.4rem; }
.contact-block { margin-bottom: 1.5rem; }
.contact-block h4 {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.13em; text-transform: uppercase; color: var(--text-3);
  margin-bottom: 0.5rem;
}
.contact-block p { margin: 0.25rem 0; font-size: 0.94rem; }
.contact-block a { color: var(--text-2); transition: color var(--t-fast); }
.contact-block a:hover { color: var(--net-blue-light); }
.social-row { display: flex; gap: 0.7rem; margin-top: 0.7rem; }
.social-link {
  width: 42px; height: 42px; border-radius: 11px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--stroke-soft); color: var(--text-2);
  transition: all var(--t-fast);
}
.social-link:hover { color: #fff; border-color: var(--net-blue); background: rgba(4, 159, 217, 0.12); transform: translateY(-3px); }
.social-link svg { width: 19px; height: 19px; }

.contact-form-card { padding: 0; overflow: hidden; }
.cf-head {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--net-green); background: rgba(5, 9, 15, 0.8);
  padding: 0.8rem 1.4rem; border-bottom: 1px solid var(--stroke-soft);
  display: flex; align-items: center; gap: 0.8rem;
}
.cf-head .dots { display: flex; gap: 5px; }
.cf-head .dots i { width: 10px; height: 10px; border-radius: 50%; }
.cf-head .dots i:nth-child(1) { background: #ff5f57; }
.cf-head .dots i:nth-child(2) { background: #febc2e; }
.cf-head .dots i:nth-child(3) { background: #28c840; }
.cf-body { padding: 1.6rem 1.5rem 1.7rem; }
.cf-body .form-submit { width: 100%; margin-top: 0.4rem; }

/* ---------------- FOOTER ---------------- */
footer { position: relative; z-index: 1; border-top: 1px solid var(--stroke-soft); background: rgba(4, 8, 14, 0.7); }
.footer-version {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-3);
  border-bottom: 1px solid var(--stroke-soft);
  padding: 1.3rem 0;
}
.footer-version .fv-line { margin: 0.15em 0; }
.footer-version .t-prompt { color: var(--net-green); }
.footer-version .t-key { color: var(--net-blue-light); }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2rem; padding: 3rem 0 2.4rem;
}
.footer-brand img { height: 56px; width: auto; margin-bottom: 1rem; }
.footer-brand p { font-size: 0.88rem; color: var(--text-2); max-width: 320px; }
.footer-brand .f-slogan { font-style: italic; color: var(--net-blue-light); margin-top: 0.7rem; font-size: 0.85rem; }
.footer-col h4 {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.13em; text-transform: uppercase; color: var(--text-3);
  margin-bottom: 1rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.55rem; }
.footer-col a { font-size: 0.9rem; color: var(--text-2); transition: color var(--t-fast), padding-left var(--t-fast); }
.footer-col a:hover { color: var(--net-blue-light); padding-left: 4px; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: 1.4rem 0 1.8rem; border-top: 1px solid var(--stroke-soft);
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-3); }
.footer-hint { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-3); }
.footer-hint kbd {
  background: var(--bg-2); border: 1px solid var(--stroke-soft); border-radius: 5px;
  padding: 0.15em 0.5em; font-family: inherit; color: var(--net-green);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1200px) {
  .osi-rail { display: none; }
}

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-term-btn { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .slogan-panel { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .course-card.featured { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hero { padding-top: calc(var(--nav-h) + 1rem); }
  .hero::after { background: linear-gradient(180deg, rgba(5, 8, 15, 0.82) 0%, rgba(5, 8, 15, 0.65) 100%); }
  .hero-stats { flex-wrap: wrap; gap: 1.2rem 1.8rem; }
  .hero-buttons .btn { width: 100%; }
  .features-grid { grid-template-columns: 1fr; }
  .instructors-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.6rem; }
  .stories-grid { grid-template-columns: 1fr; }
  .nav-cta { display: none; }
  .story-meta { flex-wrap: wrap; }
  .material-choice { flex-direction: column; }
}