/* How Data Moves: the headers, the addresses and the devices' figures.
   Loads after /slides/slides.css and ../ccna-net.css (the network, terminals, tables). */

.sv-fig { justify-content: flex-start; gap: 14px; }
@media (min-width: 861px) { .sv-side .sv-body { grid-template-columns: minmax(0, 1.9fr) minmax(300px, 1fr); } }

/* The sections' colours. */
[data-sec="intro"] { --sec: #334155; }
[data-sec="layers"] { --sec: #7c3aed; }
[data-sec="addresses"] { --sec: #0f766e; }
[data-sec="devices"] { --sec: #1d4ed8; }
[data-sec="transport"] { --sec: #b45309; }
[data-sec="traffic"] { --sec: #be123c; }

/* Introduction: the three messages. */
.msgs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.msg { background: #fff; border: 1px solid var(--sv-line); border-top: 4px solid var(--c); border-radius: 10px; padding: 10px 12px; display: flex; flex-direction: column; gap: 4px; }
.msg b { font-size: 17px; color: var(--c); }
.msg code { font-size: 13px; }
.m-ping { --c: var(--l3); } .m-dns { --c: var(--l4); } .m-http { --c: var(--l7); }

/* The OSI table. */
.osi { font-size: 14.5px; }
.osi td i { color: var(--sv-ink2); }

/* OSI beside TCP/IP. */
.models { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; max-width: 640px; }
.models .col { display: grid; grid-template-rows: auto repeat(7, 44px); gap: 6px; }
.models h4 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--sv-ink2); }
.lay { display: flex; align-items: center; gap: 10px; background: #fff; border: 1px solid var(--sv-line); border-left: 5px solid var(--c, var(--sv-line)); border-radius: 8px; padding: 0 12px; font-weight: 600; }
.lay span { font-weight: 800; color: var(--c); width: 14px; }
.lay.t { flex-direction: column; justify-content: center; align-items: flex-start; gap: 2px; border-left-color: var(--sv-accent); }
.lay.t small { font-weight: 400; color: var(--sv-ink2); font-size: 12.5px; }
.tcol .lay.t:nth-of-type(1) { border-left-color: var(--l7); }
.tcol .lay.t:nth-of-type(2) { border-left-color: var(--l4); }
.tcol .lay.t:nth-of-type(3) { border-left-color: var(--l3); }
.tcol .lay.t:nth-of-type(4) { border-left-color: var(--l2); }

/* Encapsulation: the headers, one row per layer. */
.encs { display: flex; flex-direction: column; gap: 10px; }
.enc { display: flex; align-items: center; gap: 10px; }
.enc > i { font-style: italic; color: var(--sv-ink2); min-width: 64px; }
.parts { display: flex; flex-wrap: wrap; gap: 0; }
.pdu { display: flex; flex-direction: column; justify-content: center; padding: 6px 10px; min-height: 46px; border: 1px solid rgba(0,0,0,.12); margin-right: -1px; background: var(--b); }
.pdu b { font-size: 13.5px; }
.pdu small { font: 11.5px var(--mono); color: #374151; }
.p-data { --b: #fdecef; } .p-tcp { --b: #efe7fd; } .p-ip { --b: #e3ebfd; } .p-eth { --b: #ddf1ee; } .p-icmp { --b: #e3ebfd; }
.pdu.fcs { min-width: 46px; }
.bits { font: 13px var(--mono); color: var(--sv-ink2); letter-spacing: .04em; background: #fff; border: 1px dashed var(--sv-line); padding: 10px 12px; border-radius: 6px; }

/* Decapsulation: up the stack. */
.decs { display: flex; flex-direction: column; gap: 10px; max-width: 620px; }
.dec { display: flex; align-items: center; gap: 12px; background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; }
.dec-b { display: flex; flex-direction: column; min-width: 190px; }
.dec-b small { color: var(--sv-ink2); }
.dec-b code { color: var(--sv-ink); font-weight: 700; }
.dec .arr { margin-left: auto; }
.dec .arr b { color: var(--sv-ink); }
.dec.wire { background: #f3f4f6; }

/* The three addresses. */
.acards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.acard { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; border-top: 4px solid var(--c); }
.a-mac { --c: var(--l2); } .a-ip { --c: var(--l3); } .a-port { --c: var(--l4); }
.acard b { font-size: 18px; }
.acard > code { font-size: 15px; }
.acard dl, .pkt dl, .frame dl { display: grid; grid-template-columns: auto 1fr; gap: 3px 10px; margin: 4px 0 0; font-size: 14px; }
.acard dt, .pkt dt, .frame dt { color: var(--sv-ink2); }
.acard dd, .pkt dd, .frame dd { margin: 0; }

/* The MAC address. */
.macs { display: flex; flex-direction: column; gap: 14px; max-width: 560px; }
.mac-split { display: flex; }
.mac-split > span { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 12px; border: 2px solid; }
.mac-split code { font-size: 26px; font-weight: 700; }
.mac-split small { color: var(--sv-ink2); }
.oui { border-color: var(--l2) !important; background: #ddf1ee; border-radius: 10px 0 0 10px; }
.nic { border-color: #9ca3af !important; background: #fff; border-left: 0 !important; border-radius: 0 10px 10px 0; }
.mac-forms tr:first-child { display: none; }

/* ARP and DNS: the messages. */
.pkts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pkt { background: #fff; border: 1px solid var(--sv-line); border-left: 5px solid var(--c); border-radius: 10px; padding: 10px 14px; }
.pkt p { margin: 4px 0; font-style: italic; }
.pkt.bc { --c: #b45309; } .pkt.uc { --c: var(--l3); } .pkt.rp { --c: var(--ok); }

/* The host's choice. */
.hostcfg { max-width: 560px; }
.way { display: flex; align-items: stretch; gap: 12px; }
.way > div { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 8px 14px; display: flex; flex-direction: column; gap: 2px; flex: 1; }
.way .arr { align-self: center; font-size: 22px; }
.way small { color: var(--sv-ink2); font-size: 12px; }
.way span { font-weight: 700; }
.way.same .w-dst { border-left: 5px solid var(--l2); }
.way.other .w-dst { border-left: 5px solid var(--l3); }

/* The switch. */
.sw-steps { display: flex; flex-direction: column; gap: 6px; }
.sws { background: #fff; border: 1px solid var(--sv-line); border-radius: 8px; padding: 6px 12px; font-size: 14px; }
.sws b { display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--sv-accent); color: #fff; font-size: 12px; margin-right: 8px; }

/* The router: two frames. */
.frames { display: flex; gap: 14px; align-items: stretch; flex-wrap: wrap; }
.frame { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; flex: 1; min-width: 260px; }
.frame dd small { margin-left: 8px; font-size: 11.5px; font-weight: 700; }
.frame dd.chg code { background: #fff4d6; }
.frame dd.chg small { color: #b45309; }
.frame dd.same small { color: var(--ok); }
.frame dd.ttl small { color: #b45309; }

/* TCP and UDP. */
.tu { font-size: 15px; }
.tu small { color: var(--sv-ink2); font-weight: 400; }

/* The handshake ladder. */
.ladder { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 0; max-width: 680px; position: relative; }
.ladder .side { display: flex; flex-direction: column; padding: 8px 12px; background: #fff; border: 1px solid var(--sv-line); border-radius: 8px; }
.ladder .side.r { text-align: right; }
.ladder .side small { font: 12px var(--mono); color: var(--sv-ink2); }
.segs { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 8px; border-left: 3px solid #cbd5e1; border-right: 3px solid #cbd5e1; padding: 8px 0; }
.seg { display: flex; align-items: center; gap: 10px; position: relative; padding: 4px 12px; margin: 0 20px; border-bottom: 2px solid var(--l4); }
.seg.back { flex-direction: row-reverse; border-bottom-color: var(--l3); }
.seg.to::after { content: '▶'; position: absolute; right: -8px; bottom: -9px; color: var(--l4); font-size: 12px; }
.seg.back::after { content: '◀'; position: absolute; left: -8px; bottom: -9px; color: var(--l3); font-size: 12px; }
.seg .fl { font-weight: 800; font-size: 14px; }
.seg code { font-size: 12.5px; color: var(--sv-ink2); }
.seg.data { border-bottom-style: dashed; }
.later { text-align: center; color: var(--sv-ink2); font-style: italic; font-size: 14px; }

/* Ports. */
.ports { display: flex; flex-direction: column; gap: 14px; align-items: stretch; }
.ports .plist { align-self: flex-start; }
.plist { font-size: 13.5px; }
.plist th, .plist td { padding: 4px 10px; }
.conn { display: grid; grid-template-columns: auto minmax(120px, 1fr) auto; gap: 8px 14px; align-items: end; min-width: 0; background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 12px 14px; }
.conn > b { grid-column: 1 / -1; }
.sock { display: flex; }
.sock code { padding: 3px 8px; border: 1px solid var(--sv-line); background: #e3ebfd; font-size: 13px; }
.sock code.hi { background: #efe7fd; border-left: 0; font-weight: 700; }

/* HTTP: what one page needs. */
.hsteps { display: flex; flex-direction: column; gap: 6px; }
.hstep { display: flex; align-items: center; gap: 10px; background: #fff; border: 1px solid var(--sv-line); border-radius: 8px; padding: 6px 12px; font-size: 14px; }
.hstep .tag { font-weight: 800; font-size: 12.5px; min-width: 46px; color: var(--sv-accent); }

@media (max-width: 860px) {
  .msgs, .acards, .pkts { grid-template-columns: 1fr; }
}

/* Layer 2: flat addresses and the broadcast. */
.l2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.l2-part { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; }
.l2 h4 { margin: 0 0 4px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--sv-ink2); }
.l2svg { width: 100%; max-height: 300px; }
.l2svg .tl { stroke: #9ca3af; stroke-width: 2.5; }
.l2svg .tn { fill: #e5e7eb; stroke: #9ca3af; stroke-width: 2; }
.l2svg .st { fill: #ddf1ee; stroke: var(--l2); stroke-width: 2; }
.l2svg .st.tx { fill: #b45309; stroke: #92400e; }
.l2svg .st.rx { fill: #ffe7b8; stroke: #b45309; }
.l2svg .cross { stroke: var(--no); stroke-width: 9; stroke-linecap: round; fill: none; opacity: .85; }
.l2svg .bl { stroke: #e8a33d; stroke-width: 3; }
.l2svg .ah { fill: #e8a33d; }
.l2svg .cap { font: 12.5px system-ui, sans-serif; fill: var(--sv-ink2); }
@media (max-width: 1100px) { .l2 { grid-template-columns: 1fr; } }

.pkt.d2 { --c: #0f766e; }
.pkt dd code { font-size: 12.5px; }

/* Route tables and the host with no gateway. */
.hostcfg { display: flex; flex-direction: column; gap: 8px; }
.term.gw { box-shadow: inset 4px 0 0 #7aa116; }
.nogw { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; }
.nogw .wide { grid-column: 1 / -1; }
.term.rt { font-size: 11.5px; }
.nogw .term { font-size: 11.5px; }
@media (max-width: 1100px) { .nogw { grid-template-columns: 1fr; } }

/* The IP address. */
.ipfig { display: flex; flex-direction: column; gap: 12px; max-width: 640px; }
.ipbytes { display: flex; align-items: stretch; }
.ipb { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 10px 4px; border: 2px solid; border-radius: 8px; }
.ipb b { font-size: 28px; }
.ipb code { font-size: 12.5px; letter-spacing: .05em; color: var(--sv-ink2); }
.ipb.net { background: #e3ebfd; border-color: var(--l3); }
.ipb.host { background: #fff; border-color: #9ca3af; }
.ipbytes .dot { font-style: normal; font-size: 28px; font-weight: 700; align-self: center; padding: 0 4px; }
.ipcut { display: grid; grid-template-columns: 3fr 1fr; text-align: center; font-weight: 700; font-size: 13.5px; }
.ipcut span { padding: 3px; border-top: 3px solid; }
.ipcut .net { color: var(--l3); border-color: var(--l3); margin-right: 10px; }
.ipcut .host { color: var(--sv-ink2); border-color: #9ca3af; }
.ipmask { font-size: 14px; }
.iprows { display: flex; flex-direction: column; gap: 4px; background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; }
.iprows small { color: var(--sv-ink2); }
.iprow { display: flex; gap: 14px; align-items: baseline; }
.iprow code { font-size: 15px; min-width: 130px; }
.iprow mark { background: #e3ebfd; color: var(--l3); font-weight: 700; border-radius: 3px; }

/* Ports: one host's TCP and UDP ports. */
.phost { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; display: flex; flex-direction: column; gap: 8px; }
.lane { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.lane > b { min-width: 40px; color: var(--l4); }
.lane span { display: inline-flex; gap: 6px; align-items: center; border: 1px solid var(--sv-line); border-radius: 6px; padding: 3px 8px; font-size: 13.5px; }
.lane span code { font-weight: 700; color: var(--l4); }
.portfig { display: flex; flex-direction: column; gap: 12px; max-width: 520px; }
.paddr { background: #fff; border: 1px solid var(--sv-line); border-radius: 10px; padding: 10px 14px; display: flex; flex-direction: column; gap: 4px; }
.paddr small { color: var(--sv-ink2); }
.paddr code { font-size: 20px; font-weight: 700; }
.paddr .a3 { color: var(--l3); } .paddr .a4 { color: var(--l4); }
.lane span i { font-style: normal; color: var(--sv-ink2); }
.portfig .phost b { font-size: 15px; }
.portfig .lane span { font-size: 15px; padding: 5px 10px; }

/* Interfaces: hosts holding their interfaces, each with its addresses. */
.iffig { display: flex; flex-direction: column; gap: 14px; }
.ifcols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.85fr) minmax(0, 1fr); gap: 10px; align-items: start; }
.ifcol h4 { margin: 0 0 6px; font-size: 15px; }
.hostbox { border: 2px solid #475569; border-radius: 10px; background: #f8fafc; padding: 8px 8px 0; }
.host-n { display: block; font-weight: 800; margin-bottom: 6px; }
.nics { display: flex; gap: 8px; }
.nic-box { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 5px; background: #fff; border: 1px solid var(--sv-line); border-radius: 8px; padding: 6px 8px 8px; margin-bottom: 8px; }
.nic-n { font-family: var(--mono); font-size: 13px; }
.chip { display: flex; flex-direction: column; align-items: flex-start; gap: 1px; padding: 3px 6px; border-radius: 5px; border-left: 4px solid var(--c); background: color-mix(in srgb, var(--c) 10%, #fff); }
.chip.c2 { --c: var(--l2); } .chip.c3 { --c: var(--l3); }
.chip i { font-style: normal; font-weight: 800; font-size: 11px; color: var(--c); }
.chip code { font-size: 12px; }
.chip em { font-style: normal; font-size: 11px; color: var(--l3); font-weight: 700; }
.nets { padding: 0 10px; }
.nic-wire { flex: 1; min-width: 0; text-align: center; }
.nic-wire::before { content: ''; display: block; width: 0; height: 18px; margin: 0 auto; border-left: 3px solid #475569; }
.nic-wire span { display: inline-block; background: #fff; border: 1px dashed #94a3b8; border-radius: 6px; padding: 1px 6px; font: 12px var(--mono); }
.nofwd, .samemac { margin: 0 0 8px; font-size: 12.5px; font-weight: 700; }
.nofwd { color: var(--no); }
.samemac { color: var(--l2); }
@media (max-width: 860px) { .ifcols { grid-template-columns: 1fr; } }

/* One connection: the two ends, a laptop and a server, and an arrow each way. */
.c-end { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.c-end .ico { height: 22px; overflow: visible; }
.ico .d-pc, .ico .d-slot { stroke: #64748b; stroke-width: 1.5; }
.ico .d-pc { fill: #fff; }
.ico .d-screen { fill: #e6f2fa; }
.c-dirs { display: flex; flex-direction: column; gap: 10px; padding-bottom: 2px; }
.c-dir { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.c-dir small { font-size: 12px; color: var(--sv-ink2); }
.c-dir small code { font-size: 12px; color: var(--sv-ink); font-weight: 700; }
.c-line { position: relative; display: block; width: 100%; height: 0; border-top: 2px solid var(--l4); }
.c-line::after { content: ''; position: absolute; top: -6px; border: 5px solid transparent; }
.c-line.r::after { right: -2px; border-left: 8px solid var(--l4); border-right: 0; }
.c-line.l::after { left: -2px; border-right: 8px solid var(--l4); border-left: 0; }
@media (max-width: 560px) {
  .conn { grid-template-columns: auto minmax(70px, 1fr) auto; gap: 8px; padding: 10px; }
  .conn .sock { flex-direction: column; align-items: stretch; text-align: center; }
  .conn .sock code.hi { border-left: 1px solid var(--sv-line); border-top: 0; }
  .c-dir small { font-size: 11px; text-align: center; }
}