/* Paixi Technology - Russian tutorial site */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #f4f6f8;
  color: #1f2933;
  line-height: 1.7;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }
a { color: #1a5fb4; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.top { background: #14324f; color: #fff; padding: 14px 0; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.brand { color: #fff; font-size: 18px; font-weight: 700; letter-spacing: .3px; }
.brand:hover { text-decoration: none; }
.brand small { display: block; font-size: 12px; font-weight: 400; opacity: .8; }
.top nav a { color: #cfe3f7; margin-left: 14px; font-size: 14px; }

/* Layout */
main.wrap { padding: 28px 20px 40px; }
.page { background: #fff; border-radius: 10px; padding: 32px 36px; box-shadow: 0 1px 4px rgba(16,42,67,.08); }

/* Breadcrumb */
.crumb { font-size: 13px; color: #5b6b7b; margin-bottom: 14px; }

/* Article */
h1 { font-size: 27px; line-height: 1.35; margin-bottom: 10px; color: #10263e; }
h2 { font-size: 20px; margin: 26px 0 10px; color: #14324f; border-left: 4px solid #1a5fb4; padding-left: 10px; }
h3 { font-size: 16px; margin: 18px 0 8px; color: #1f5a8f; }
.meta { color: #6b7a8a; font-size: 13px; border-bottom: 1px solid #e5eaf0; padding-bottom: 12px; margin-bottom: 18px; }
p { margin: 10px 0; }
ul, ol { margin: 10px 0 10px 22px; }
li { margin: 5px 0; }
.note { background: #fff8e6; border: 1px solid #f0d98c; border-radius: 8px; padding: 12px 16px; margin: 14px 0; font-size: 15px; }
.warn { background: #fdecec; border: 1px solid #f2b8b5; border-radius: 8px; padding: 12px 16px; margin: 14px 0; font-size: 15px; }
.tip { background: #e8f4ec; border: 1px solid #b7dcc4; border-radius: 8px; padding: 12px 16px; margin: 14px 0; font-size: 15px; }
code { background: #eef2f6; padding: 2px 6px; border-radius: 4px; font-size: .92em; color: #0f3d68; }
.video-box { margin: 18px 0; }
.video-box video { width: 100%; max-width: 640px; background: #000; border-radius: 8px; display: block; }
.video-cap { font-size: 13px; color: #5b6b7b; margin-top: 6px; }
.img-box { margin: 12px 0; text-align: center; }
.img-box img { max-width: 100%; max-height: 460px; border-radius: 6px; border: 1px solid #e0e6ec; }
.img-cap { font-size: 12px; color: #77838f; margin-top: 4px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; margin: 16px 0; }
.gallery figure { background: #fafbfc; border: 1px solid #e3e8ee; border-radius: 8px; padding: 8px; text-align: center; }
.gallery img { max-width: 100%; max-height: 300px; border-radius: 4px; }
.gallery figcaption { font-size: 12px; color: #66727f; margin-top: 6px; }
.step { background: #f7fafc; border: 1px solid #dde6ee; border-left: 5px solid #1a5fb4; border-radius: 8px; padding: 16px 18px; margin: 16px 0; }
.step b { color: #14324f; }
.btn-back { display: inline-block; margin-top: 20px; font-size: 14px; }

/* Step navigation buttons */
.step-next { display: flex; flex-wrap: wrap; gap: 14px; margin: 10px 0 6px; }
.btn-step { display: inline-block; background: linear-gradient(135deg, #1f5a8f 0%, #2f7fc2 100%); color: #fff; font-weight: 700; font-size: 16px; line-height: 1.3; padding: 14px 26px; border-radius: 10px; text-decoration: none; box-shadow: 0 3px 8px rgba(31,90,143,.3); max-width: 420px; }
.btn-step:hover { text-decoration: none; background: linear-gradient(135deg, #184a75 0%, #286ba6 100%); color: #fff; }
.btn-step .st { display: block; font-size: 12px; font-weight: 600; opacity: .85; margin-bottom: 3px; letter-spacing: .3px; }

/* Support banner (index) */
.support-banner { background: linear-gradient(135deg, #0e7a3d 0%, #14a050 100%); color: #fff; border-radius: 12px; padding: 26px 32px; margin: 0 0 26px; box-shadow: 0 3px 12px rgba(14,122,61,.25); }
.support-banner .sb-title { font-size: 21px; font-weight: 800; margin-bottom: 8px; }
.support-banner p { color: #e8f7ee; font-size: 15px; margin: 6px 0 14px; }
.sb-links { display: flex; flex-wrap: wrap; gap: 12px; }
.sb-btn { display: inline-block; background: #fff; color: #0e7a3d; font-weight: 700; font-size: 15px; padding: 10px 20px; border-radius: 8px; text-decoration: none; }
.sb-btn:hover { text-decoration: none; background: #f0fff5; }
.sb-btn.sb-mail { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.sb-btn.sb-mail:hover { background: rgba(255,255,255,.28); }
.sb-hint { font-size: 13px; color: #cdeeda; margin-top: 10px; }

/* Index */
.hero { background: linear-gradient(135deg, #14324f 0%, #1f5a8f 100%); color: #fff; border-radius: 12px; padding: 34px 36px; margin-bottom: 26px; }
.hero h1 { color: #fff; font-size: 28px; }
.hero p { color: #d5e6f5; margin-top: 8px; font-size: 15px; }
.hero .tags { margin-top: 14px; }
.tag { display: inline-block; background: rgba(255,255,255,.15); border-radius: 20px; padding: 3px 12px; font-size: 12px; margin-right: 6px; }
.section { margin: 30px 0; }
.section h2 { border: none; padding-left: 0; font-size: 22px; border-bottom: 2px solid #1a5fb4; padding-bottom: 6px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-top: 16px; }
.card { background: #fff; border: 1px solid #e2e8ee; border-radius: 10px; padding: 18px 20px; transition: box-shadow .15s; }
.card:hover { box-shadow: 0 4px 14px rgba(20,50,79,.12); text-decoration: none; }
.card h3 { color: #14324f; font-size: 16px; margin: 0 0 6px; }
.card p { color: #5b6b7b; font-size: 13px; margin: 0; }
.card .badge { display: inline-block; background: #e8f1fa; color: #1a5fb4; border-radius: 4px; font-size: 11px; padding: 1px 8px; margin-bottom: 8px; }
.step-row { background: #fff; border: 1px solid #e2e8ee; border-radius: 10px; padding: 20px 24px; margin: 14px 0; display: flex; gap: 18px; align-items: flex-start; }
.step-row .num { font-size: 30px; font-weight: 800; color: #1a5fb4; line-height: 1; min-width: 44px; }
.step-row h3 { margin: 0 0 6px; color: #14324f; }
.step-row p { color: #4a5a6a; font-size: 14px; margin: 0; }
.step-row a { font-size: 14px; }

/* Footer */
.foot { background: #14324f; color: #b9c9d8; padding: 26px 0; margin-top: 20px; font-size: 14px; }
.foot p { margin: 4px 0; }
.foot b { color: #fff; }

@media (max-width: 640px) {
  .page { padding: 20px 16px; }
  h1 { font-size: 22px; }
  .hero { padding: 24px 20px; }
}