/*
Theme Name: Sethu Final Webpage
Theme URI: http://www.sethusankaran.com
Author: Sethu Sankaran
Author URI: http://www.sethusankaran.com
Description: Personal academic theme for sethusankaran.com: dark gradient navbar, full-bleed hero, rotating news ticker, research thrust cards and project cards, styled after the Iowa State IDEA Lab site.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 7.1
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: sethufinalwebpage
Tags: one-column, custom-menu, custom-logo, featured-images, threaded-comments, translation-ready, education, portfolio
*/

/* ===== Base ===== */
:root {
  --ss-accent: #e87000;
  --ss-accent-dark: #c05a00;
  --ss-accent-light: #fff3e0;
  --ss-dark: #222;
  --ss-text: #2d2d2d;
  --ss-muted: #6c757d;
  --ss-border: #e9ecef;
  --ss-card-bg: #f8f9fa;
  --ss-nav-height: 64px;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { overflow-x: hidden; }
body {
  margin: 0; font-family: 'Roboto', sans-serif; font-size: 16px; color: var(--ss-text);
  line-height: 1.65; background: #fff; display: flex; flex-direction: column; min-height: 100vh;
}
h1, h2, h3, h4, h5, h6 { font-family: 'Montserrat', sans-serif; font-weight: 700; line-height: 1.25; color: var(--ss-text); }
a { color: var(--ss-accent); }
a:hover, a:focus { color: var(--ss-accent-dark); }
img { max-width: 100%; height: auto; }
.screen-reader-text {
  border: 0; clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%); height: 1px; width: 1px;
  margin: -1px; overflow: hidden; padding: 0; position: absolute !important; word-wrap: normal !important;
}
.screen-reader-text:focus {
  clip: auto !important; clip-path: none; height: auto; width: auto; display: block; z-index: 100000;
  top: 8px; left: 8px; padding: 12px 20px; background: #fff; color: var(--ss-text); border-radius: 4px;
}

/* ===== Header / navbar ===== */
.site-header {
  background-color: var(--ss-dark);
  background-image: linear-gradient(to bottom, #3c3c3c 0%, #222 100%);
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
  position: sticky; top: 0; z-index: 1000;
}
.admin-bar .site-header { top: 32px; }
.site-header-inner {
  width: min(1040px, 100% - 3rem); margin: 0 auto; min-height: var(--ss-nav-height);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.site-branding { display: flex; align-items: center; gap: .75rem; }
.site-branding .custom-logo { max-height: 44px; width: auto; display: block; }
.site-title { margin: 0; font-family: 'Montserrat', sans-serif; font-size: 1.25rem; font-weight: 700; }
.site-title a { color: var(--ss-accent); text-decoration: none; }
.site-title a:hover { color: #ff8c1a; }
.site-description { margin: 0; font-size: .8rem; color: rgba(255,255,255,.6); }

.main-navigation ul { list-style: none; margin: 0; padding: 0; }
.main-navigation > div > ul, .main-navigation > ul { display: flex; align-items: center; gap: .25rem; }
.main-navigation li { position: relative; }
.main-navigation a {
  display: block; padding: .5rem .8rem; color: rgba(255,255,255,.85); font-weight: 500;
  text-decoration: none; transition: color .2s;
}
.main-navigation a:hover, .main-navigation a:focus,
.main-navigation .current-menu-item > a, .main-navigation .current_page_item > a,
.main-navigation .current-menu-ancestor > a, .main-navigation .current_page_ancestor > a { color: #fff; }
.main-navigation .menu-item-has-children > a::after, .main-navigation .page_item_has_children > a::after {
  content: ""; display: inline-block; margin-left: .4em; vertical-align: .2em;
  border-top: .3em solid; border-right: .3em solid transparent; border-left: .3em solid transparent;
}
.main-navigation ul ul {
  position: absolute; top: 100%; left: 0; min-width: 240px; padding: .5rem 0; z-index: 1001;
  background: #fff; border-radius: 8px; box-shadow: 0 8px 24px rgba(0,0,0,.15);
  opacity: 0; visibility: hidden; transform: translateY(6px); transition: opacity .15s, transform .15s, visibility .15s;
}
.main-navigation li:hover > ul, .main-navigation li:focus-within > ul { opacity: 1; visibility: visible; transform: none; }
.main-navigation ul ul ul { top: 0; left: 100%; }
.main-navigation ul ul a { color: var(--ss-text); font-size: .9rem; padding: .45rem 1.1rem; }
.main-navigation ul ul a:hover, .main-navigation ul ul a:focus,
.main-navigation ul ul .current-menu-item > a, .main-navigation ul ul .current_page_item > a {
  background: var(--ss-accent-light); color: var(--ss-accent);
}
.menu-toggle {
  display: none; background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.4);
  border-radius: 6px; padding: .35rem .6rem; font-size: 1.4rem; line-height: 1; cursor: pointer;
}

/* ===== Main content ===== */
.site-main { flex: 1 0 auto; width: min(1040px, 100% - 3rem); margin: 0 auto; padding: 2.5rem 0 1rem; }
.ss-has-hero .site-main { padding-top: 0; }
.entry-header { margin-bottom: 1.5rem; }
.entry-title { font-size: 1.9rem; margin: 0 0 .25rem; }
.entry-title a { color: inherit; text-decoration: none; }
.entry-title a:hover { color: var(--ss-accent); }
.entry-meta { font-size: .85rem; color: var(--ss-muted); }
.entry-content { text-align: left; }
.entry-content > :first-child { margin-top: 0; }
.entry-content h2 { font-size: 1.9rem; }
.entry-content h3 { font-size: 1.4rem; }
.entry-content blockquote { margin: 1.5rem 0; padding: .5rem 1.25rem; border-left: 4px solid var(--ss-accent); background: var(--ss-card-bg); }
.entry-content .alignwide { width: min(1040px, 100vw - 3rem); max-width: none; }
.entry-content .alignfull { width: 100vw; max-width: none; position: relative; left: 50%; transform: translateX(-50%); }
.post-thumbnail img { border-radius: 8px; margin-bottom: 1.25rem; }
.ss-post-list article { padding: 1.5rem 0; border-bottom: 1px solid var(--ss-border); }
.ss-post-list article:first-child { padding-top: 0; }
.navigation.pagination, .post-navigation { margin: 2rem 0; }
.nav-links { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: space-between; }
.page-numbers { padding: .35rem .75rem; border-radius: 6px; background: var(--ss-card-bg); text-decoration: none; }
.page-numbers.current { background: var(--ss-accent); color: #fff; }
.search-form { display: flex; gap: .5rem; margin: 1rem 0; }
.search-form .search-field { flex: 1; padding: .55rem .8rem; border: 1px solid #ced4da; border-radius: 6px; font: inherit; }
.search-form .search-submit, .comment-form input[type="submit"] {
  padding: .55rem 1.1rem; border-radius: 6px; border: 0; background: var(--ss-accent); color: #fff;
  font: inherit; font-weight: 600; cursor: pointer;
}
.comments-area { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--ss-border); }
.comment-list { list-style: none; padding: 0; }
.comment-list .children { list-style: none; padding-left: 1.5rem; }
.comment-body { padding: 1rem; margin-bottom: 1rem; background: var(--ss-card-bg); border-radius: 8px; }
.comment-form input[type="text"], .comment-form input[type="email"], .comment-form input[type="url"], .comment-form textarea {
  width: 100%; padding: .55rem .8rem; border: 1px solid #ced4da; border-radius: 6px; font: inherit;
}
.ss-404 { text-align: center; padding: 4rem 0; }
.ss-404 .ss-404-code { font-family: 'Montserrat', sans-serif; font-size: 5rem; font-weight: 700; color: var(--ss-accent); margin: 0; line-height: 1; }

/* ===== Footer ===== */
.site-footer {
  flex-shrink: 0; margin-top: 3rem;
  background-color: var(--ss-dark);
  background-image: linear-gradient(to bottom, #3c3c3c 0%, #222 100%);
  color: rgba(255,255,255,.75); font-size: .875rem;
}
.site-footer-inner {
  width: min(1040px, 100% - 3rem); margin: 0 auto; min-height: 80px; padding: 1.25rem 0;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem;
}
.site-footer a { color: var(--ss-accent); text-decoration: none; }
.site-footer a:hover { color: #ff8c1a; }
.footer-navigation ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1.25rem; }
.ss-social { display: flex; gap: 1rem; font-size: 1.15rem; }

/* ===== Page components ===== */
/* ---- Layout helpers ---- */
.ss-wide, .ss-bleed {
  position: relative; left: 50%; transform: translateX(-50%);
  box-sizing: border-box; text-align: left;
}
.ss-wide { width: min(1040px, 100vw - 3rem); margin: 2.5rem 0; }
.ss-bleed { width: 100vw; max-width: 100vw; }
.ss-wide p { margin-bottom: 1.15rem; }
.ss-wide h2 { font-size: 1.9rem; margin: 2rem 0 .75rem; }
.ss-wide h2#pageName { margin-top: .5rem; }
.ss-wide h3 { font-size: 1.4rem; margin: 1.5rem 0 .5rem; }
.ss-wide h4 { font-size: 1.15rem; margin: 0 0 .6rem; }
.ss-lead { font-size: 1.12rem; }
.ss-muted { color: var(--ss-muted); }
.ss-small { font-size: .875rem; }
.ss-right { text-align: right; }

/* ---- Hero banner ---- */
.ss-banner {
  height: min(78vh, 640px); min-height: 420px; margin: 0 0 0;
  display: flex; align-items: center; justify-content: center;
  background-color: #1d2733;
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(232,112,0,.35) 0%, rgba(232,112,0,0) 55%),
    radial-gradient(ellipse at 80% 70%, rgba(26,108,168,.45) 0%, rgba(26,108,168,0) 55%),
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(135deg, #10161f 0%, #26313f 100%);
  background-size: auto, auto, 40px 40px, 40px 40px, auto;
  background-attachment: scroll, scroll, fixed, fixed, scroll;
}
.ss-bannertext {
  text-align: center; padding: 2rem 2.5rem; width: 90%; max-width: 520px;
  border: 3px solid rgba(255,255,255,.75); border-radius: 4px;
  background: rgba(0,0,0,.35); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.ss-bannertext h1 {
  font-size: clamp(1.9rem, 5vw, 3.1rem); color: var(--ss-accent); margin: 0 0 .5rem;
  text-shadow: 0 2px 8px rgba(0,0,0,.4);
}
.ss-bannertext .ss-sub {
  font-family: 'Montserrat', sans-serif; font-size: clamp(.95rem, 2.4vw, 1.25rem);
  color: rgba(255,255,255,.92); margin: 0 0 1.25rem; font-weight: 400; text-shadow: 0 1px 4px rgba(0,0,0,.4);
}
.ss-bannertext .ss-btn { margin: .25rem; }

/* ---- Buttons ---- */
.ss-btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .55rem 1.1rem; border-radius: 6px; font-weight: 600; font-size: .92rem;
  background: var(--ss-accent); color: #fff !important; text-decoration: none !important;
  border: 2px solid var(--ss-accent); transition: background .2s, transform .15s;
}
.ss-btn:hover { background: var(--ss-accent-dark); border-color: var(--ss-accent-dark); transform: translateY(-1px); }
.ss-btn.ss-outline { background: transparent; color: var(--ss-accent) !important; }
.ss-btn.ss-outline:hover { background: var(--ss-accent-light); }
.ss-bannertext .ss-btn.ss-outline { color: #fff !important; border-color: rgba(255,255,255,.8); }
.ss-bannertext .ss-btn.ss-outline:hover { background: rgba(255,255,255,.12); }
.ss-btnrow { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0 0; }

/* ---- Recent news ticker ---- */
.ss-news {
  display: flex; align-items: stretch; margin: 0;
  background: var(--ss-accent-light); border-bottom: 1px solid #ffe0b2; border-top: 1px solid #ffe0b2;
}
.ss-news-inner { display: flex; align-items: center; gap: 1rem; width: min(1040px, 100vw - 3rem); margin: 0 auto; min-height: 58px; }
.ss-news-label {
  flex: 0 0 auto; display: inline-flex; align-items: center; gap: .5rem;
  font-family: 'Montserrat', sans-serif; font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: #fff; background: var(--ss-accent); padding: .4rem .75rem; border-radius: 3px;
  animation: ssFlash 1.6s ease-in-out infinite;
}
.ss-news-dot { width: 8px; height: 8px; border-radius: 50%; background: #fff; animation: ssPulse 1.6s ease-out infinite; }
.ss-news-items { position: relative; flex: 1 1 auto; height: 3.2em; overflow: hidden; }
.ss-news-item {
  position: absolute; inset: 0; display: flex; align-items: center; gap: .6rem;
  opacity: 0; visibility: hidden; animation: ssRotate 18s infinite; line-height: 1.35;
}
.ss-news-item i { color: var(--ss-accent); font-size: 1.15rem; }
.ss-news-item:nth-child(2) { animation-delay: 6s; }
.ss-news-item:nth-child(3) { animation-delay: 12s; }
.ss-news:hover .ss-news-item, .ss-news:hover .ss-news-label, .ss-news:hover .ss-news-dot { animation-play-state: paused; }
@keyframes ssRotate {
  0%      { opacity: 0; visibility: visible; transform: translateY(10px); }
  3%      { opacity: 1; visibility: visible; transform: translateY(0); }
  30%     { opacity: 1; visibility: visible; transform: translateY(0); }
  33.33%  { opacity: 0; visibility: hidden;  transform: translateY(-10px); }
  100%    { opacity: 0; visibility: hidden; }
}
@keyframes ssFlash { 0%, 100% { background: var(--ss-accent); } 50% { background: #c0392b; } }
@keyframes ssPulse { 0% { box-shadow: 0 0 0 0 rgba(255,255,255,.9); } 100% { box-shadow: 0 0 0 8px rgba(255,255,255,0); } }
@media (prefers-reduced-motion: reduce) {
  .ss-news-label, .ss-news-dot { animation: none; }
  .ss-news-items { height: auto; padding: .5rem 0; }
  .ss-news-item { position: static; opacity: 1; visibility: visible; animation: none; margin: .2rem 0; }
}

/* ---- Section label ---- */
.ss-section-label {
  font-family: 'Montserrat', sans-serif !important; font-size: .72rem !important; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.5px; color: var(--ss-muted) !important;
  margin: 2.25rem 0 1rem !important; padding-bottom: .4rem; border-bottom: 1px solid var(--ss-border);
}

/* ---- Thrust cards ---- */
.ss-thrusts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-bottom: 1rem; }
.ss-thrust {
  display: flex; flex-direction: column; height: 100%; box-sizing: border-box;
  background: #fff; border: 1px solid rgba(0,0,0,.125); border-top: 5px solid var(--c, #e87000); border-radius: 6px;
  box-shadow: 0 .125rem .25rem rgba(0,0,0,.075);
  text-decoration: none !important; color: inherit !important; text-align: left;
  transition: transform .2s ease, box-shadow .2s ease;
}
.ss-thrust:hover { transform: translateY(-5px); box-shadow: 0 12px 32px rgba(0,0,0,.13); }
.ss-thrust-body { padding: 1.1rem 1.1rem .5rem; flex-grow: 1; }
.ss-thrust-tag {
  display: inline-block; font-size: .65rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: #fff; background: var(--c, #e87000); border-radius: 3px; padding: 2px 8px; margin-bottom: .75rem;
}
.ss-thrust-icon { font-size: 2.4rem; line-height: 1; color: var(--c, #e87000); margin-bottom: .5rem; }
.ss-thrust h5 { font-family: 'Montserrat', sans-serif; font-size: 1rem; font-weight: 700; margin: 0 0 .5rem; color: var(--ss-text); }
.ss-thrust p { font-size: .85rem; color: var(--ss-muted); margin: 0; }
.ss-thrust-foot { padding: .5rem 1.1rem 1rem; color: var(--c, #e87000); font-size: .85rem; font-weight: 600; }
.ss-thrusts.ss-large p { font-size: .95rem; }

/* ---- Link rows (research-card) ---- */
.ss-link {
  display: flex; align-items: center; padding: .9rem 1.25rem; margin-bottom: .5rem;
  background: var(--ss-card-bg); border-left: 4px solid var(--ss-accent); border-radius: 0 8px 8px 0;
  text-decoration: none !important; color: var(--ss-text) !important; font-weight: 500;
  transition: background .2s, transform .15s;
}
.ss-link:hover { background: var(--ss-accent-light); transform: translateX(5px); }
.ss-link i { margin-right: .65rem; color: var(--ss-accent); font-size: 1.1rem; }

/* ---- Content cards (sub-pages) ---- */
.ss-card {
  background: #fff; border: 1px solid rgba(0,0,0,.125); border-radius: 6px;
  box-shadow: 0 .125rem .25rem rgba(0,0,0,.075); padding: 1.25rem 1.4rem; margin-bottom: 1.5rem;
}
.ss-card h4 { font-family: 'Montserrat', sans-serif; }
.ss-card .ss-tag {
  display: inline-block; font-size: .65rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: #fff; background: var(--ss-accent); border-radius: 3px; padding: 2px 8px; margin-bottom: .6rem;
}
.ss-fig { text-align: center; margin: 1rem 0 .25rem; }
.ss-fig img {
  max-width: 100%; max-height: 340px; width: auto; height: auto; object-fit: contain;
  padding: .25rem; background: #fff; border: 1px solid #dee2e6; border-radius: 6px;
}
.ss-fig figcaption { font-size: .85rem; color: var(--ss-muted); margin-top: .5rem; }
.ss-grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.ss-grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.ss-mini { background: var(--ss-card-bg); border-radius: 8px; padding: 1rem 1.1rem; }
.ss-mini h5 { font-family: 'Montserrat', sans-serif; font-size: .95rem; margin: 0 0 .35rem; }
.ss-mini p { font-size: .88rem; color: var(--ss-muted); margin: 0; }

/* ---- About row ---- */
.ss-about { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 2rem; align-items: start; }
.ss-about img {
  width: 200px; height: 200px; object-fit: cover; object-position: center 20%;
  border-radius: 50%; border: 3px solid var(--ss-accent); display: block; margin: .25rem auto 0;
}

/* ---- Address cards (contact) ---- */
.ss-address { background: var(--ss-card-bg); border-radius: 10px; padding: 1.5rem; height: 100%; box-sizing: border-box; }
.ss-address h2 { margin: 0 0 .75rem !important; font-size: 1.25rem !important; }
.ss-address h2 i { color: var(--ss-accent); margin-right: .5rem; }
.ss-address p { margin: 0 0 .4rem !important; }

/* ---- Tables (experience, patents) ---- */
.ss-table { width: 100%; border-collapse: collapse; margin: 0 0 1rem; font-size: .95rem; }
.ss-table td, .ss-table th { border: 0; border-bottom: 1px solid var(--ss-border); padding: .8rem 1rem; vertical-align: top; text-align: left; }
.ss-table tr:first-child td, .ss-table tr:first-child th { border-top: 1px solid var(--ss-border); }
.ss-table td:first-child { white-space: nowrap; color: var(--ss-muted); font-weight: 500; width: 1%; }

/* ---- Publications ---- */
.ss-publist { font-size: .9rem; line-height: 1.55; }
.ss-publist ol, .ss-publist ul { padding-left: 1.4rem; }
.ss-publist li { margin-bottom: .55rem; text-align: justify; }
.ss-publist a { color: #1a6bbf !important; text-decoration: none; }
.ss-publist a:hover { color: #0d47a1 !important; text-decoration: underline; }


/* ===== Responsive ===== */
@media (max-width: 782px) {
  .admin-bar .site-header { top: 46px; }
}
@media (max-width: 600px) {
  .admin-bar .site-header { top: 0; }
}
@media (max-width: 860px) {
  .menu-toggle { display: block; }
  .site-header-inner { flex-wrap: wrap; }
  .main-navigation { display: none; width: 100%; padding-bottom: .75rem; }
  .main-navigation.toggled { display: block; }
  .main-navigation > div > ul, .main-navigation > ul { flex-direction: column; align-items: stretch; }
  .main-navigation ul ul {
    position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none;
    background: transparent; padding: 0 0 0 1rem; min-width: 0;
  }
  .main-navigation ul ul a { color: rgba(255,255,255,.75); }
  .main-navigation ul ul a:hover, .main-navigation ul ul a:focus { background: transparent; color: #fff; }
}
@media (max-width: 900px) {
  .ss-thrusts, .ss-grid3 { grid-template-columns: 1fr; }
}
@media (max-width: 767.98px) {
  .ss-grid2 { grid-template-columns: 1fr; }
  .ss-about { grid-template-columns: 1fr; }
  .ss-banner { background-attachment: scroll; min-height: 380px; }
  .ss-news-inner { flex-direction: column; align-items: flex-start; gap: .4rem; padding: .6rem 0; }
  .ss-news-items { width: 100%; height: 4.2em; }
}