/*
 * Style sheet for the personal website project.
 * This file defines the layout and responsive behaviour for both desktop and mobile views.
 */

/* Global resets */
* { box-sizing: border-box; }

/* Theme variables */
:root {
    --bg:#ffffff; --fg:#222222; --accent:#007acc; --accent-hover:#005fa3; --card:#fafafa; --border:#cccccc; --muted:#555;
    /* Layout tokens */
    --container-desktop:900px; --container-mobile:600px;
    --header-desktop:200px; --header-mobile:150px; --menu-mobile:50px;
    --gap:20px; --space-sm:12px; --space-xs:8px;
}
body.dark {
    --bg:#181a1b; --fg:#e3e6e8; --accent:#4da8ff; --accent-hover:#1e87d6; --card:#242729; --border:#3a3d40; --muted:#aaa;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin:0; padding:0;
    background:var(--bg); color:var(--fg);
    transition: background .3s, color .3s;
}

/* Utility / Accessibility */
.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Header styling */
/* Page structural container */
.page { width:100%; max-width:var(--container-desktop); margin:0 auto; padding:0 0 40px; }

header.site-header {
    position:relative; height:var(--header-desktop); background:var(--card);
    border-bottom:1px solid var(--border); display:flex; align-items:center; justify-content:center; padding:0;
}

header h1 {
    margin: 0;
    font-size: 2rem;
    color: var(--fg);
}

/* Navigation menu styling */
nav.site-menu { margin-top:var(--gap); background:var(--bg); padding:0; }

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

nav li {
    padding: 10px 20px;
    margin-right: 10px;
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s, border-color 0.2s;
}

nav li:hover,
nav li.active {
    background-color: var(--bg);
    border-color: var(--accent);
}

/* Profile links (LinkedIn / GitHub unified label) */
.profile-link { font-weight:600; text-decoration:none; color:var(--accent); }
.profile-link:hover, .profile-link:focus { text-decoration:underline; }
.profile-links { display:flex; align-items:center; gap:6px; flex-wrap:wrap; }
.profile-link .icon { display:inline-flex; vertical-align:middle; margin-right:4px; }

/* Main content container */
.site-main { width:100%; }

/* Inner wrapper to provide consistent padding inside sections */
.section-inner { padding:var(--gap) 0 10px; }

/* Generic tab content styling */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Flex layout for image and text blocks */
/* Unified main two-column layout */
.main { margin-top:var(--gap); }
/* New grid layout replacing flex rails on desktop */
.layout-grid { display:grid; grid-template-columns:260px 1fr; grid-template-rows:auto auto auto; grid-template-areas:
    "image right"
    "subtext right"
    "content content"; gap:var(--gap); }
.grid-image { grid-area:image; }
.grid-right { grid-area:right; }
.grid-subtext { grid-area:subtext; font-size:.8rem; line-height:1.3; }
.grid-content { grid-area:content; }
.small-texts { font-size:.8rem; line-height:1.3; }

.image-block { flex:0 0 auto; }

.image-block img { width:100%; height:auto; border:1px solid var(--border); border-radius:4px; }
.avatar-img { width:100%; max-width:100%; height:auto; display:block; }
@media (max-width:768px){ .avatar-img { width:140px; } }

.text-block {
    flex-grow: 1;
    line-height: 1.5;
}

/* Column variant for stacking content explicitly */
/* Stack variant no longer required; unified by responsive rules */

ul.compact {
    margin: 10px 0 15px 20px;
    padding: 0;
}

ul.tags {
    list-style: none;
    padding: 0;
    margin: 10px 0 20px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
ul.tags li {
    background: #eef5ff;
    border: 1px solid #c7ddf7;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* Adjust tag chips for dark theme */
body.dark ul.tags li { background:#22303d; border-color:#35506b; }

.note {
    font-size: 0.85rem;
    color: var(--muted);
}

/* Project cards styling */
.project-card { border:1px solid var(--border); border-radius:4px; padding:15px; margin-bottom:20px; background:var(--card); box-shadow:0 1px 2px rgba(0,0,0,0.05); }

.project-card h3 {
    margin-top: 0;
}

.project-card img.project-image {
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: 4px;
    margin-bottom: 10px;
}

.project-card button { padding:8px 12px; border:none; background:var(--accent); color:#fff; border-radius:4px; cursor:pointer; transition:background .2s; }
.project-card button:hover { background:var(--accent-hover); }

.details {
    display: none;
    margin-top: 10px;
    padding: 10px;
    background-color: var(--bg);
    border: 1px dashed var(--border);
    border-radius: 4px;
}

/* Diagram gallery inside project details */
.diagram-gallery { display:flex; flex-wrap:wrap; gap:15px; margin:10px 0; }
.diagram-gallery figure { flex:1 1 260px; margin:0; background:var(--card); border:1px solid var(--border); padding:8px; border-radius:4px; overflow:visible; }
.diagram-gallery img { width:100%; height:auto; display:block; cursor:zoom-in; position:relative; transform-origin:center; transition: transform .25s ease, box-shadow .25s ease; will-change: transform; }
.diagram-gallery img:hover,
.diagram-gallery img:focus-visible,
.diagram-gallery img.popped { transform: scale(1.85); z-index:5; box-shadow:0 15px 40px rgba(0,0,0,0.35); }
.diagram-gallery figcaption { font-size:.65rem; text-transform:uppercase; letter-spacing:.5px; margin-top:4px; color:var(--muted); text-align:center; }


/* Flip card effect */
.flip-card { background:transparent; width:100%; max-width:260px; height:160px; perspective:1000px; margin:10px 0; }
.flip-inner { position:relative; width:100%; height:100%; transition: transform 0.8s; transform-style:preserve-3d; }
.flip-card:hover .flip-inner { transform: rotateY(180deg); }
.flip-front, .flip-back { position:absolute; width:100%; height:100%; backface-visibility:hidden; display:flex; align-items:center; justify-content:center; border:1px solid var(--border); border-radius:10px; background:var(--card); overflow:hidden; }
.flip-front { font-weight:600; }
.flip-back { transform: rotateY(180deg); font-size:.9rem; }
.flip-face-img { width:100%; height:100%; object-fit:cover; display:block; }
.flip-card:hover { filter: drop-shadow(0 8px 20px rgba(0,0,0,0.15)); }

/* Contact form */
#contact-form { display:flex; flex-direction:column; gap:10px; margin-top:10px; }
#contact-form label { font-size:.85rem; display:flex; flex-direction:column; gap:4px; }
#contact-form input, #contact-form textarea { width:100%; padding:8px 10px; border:1px solid var(--border); border-radius:4px; background:var(--bg); color:var(--fg); }
#contact-form button { width:140px; padding:8px 12px; border:none; background:var(--accent); color:#fff; border-radius:4px; cursor:pointer; }
#contact-form button:hover { background:var(--accent-hover); }


/* Tooltip styling */
.tooltip { position:absolute; background:#333; color:#fff; padding:5px 8px; border-radius:3px; font-size:12px; display:none; z-index:2000; }

/* Theme toggle */
.theme-toggle { position:absolute; top:15px; right:20px; padding:6px 10px; border:1px solid var(--border); background:var(--card); color:var(--fg); border-radius:4px; cursor:pointer; }
body.dark .theme-toggle { border-color:#555; }

/* Project filter */
.project-filter { margin:10px 0 20px; }
#project-search { width:100%; padding:8px 10px; border:1px solid var(--border); border-radius:4px; background:var(--bg); color:var(--fg); }

/* Skill bars */
.skill-bars { margin:10px 0 25px; display:flex; flex-direction:column; gap:10px; }
.skill { display:flex; align-items:center; gap:10px; font-size:.8rem; text-transform:uppercase; letter-spacing:.5px; }
.skill .label { width:90px; font-weight:600; }
.skill .bar { flex:1; background:var(--card); border:1px solid var(--border); height:10px; border-radius:5px; position:relative; overflow:hidden; }
.skill .fill { position:absolute; top:0; left:0; height:100%; width:0; background:var(--accent); transition:width 1.2s ease; }
.skill.animated .fill { box-shadow:0 0 0 1px rgba(0,0,0,0.05); }
.skill .pct { width:50px; text-align:right; font-size:.7rem; font-weight:600; color:var(--muted); margin-left:6px; }
body.dark .skill .pct { color:#ccc; }

/* Focus styles */
:focus { outline:2px solid var(--accent); outline-offset:2px; }

/* Reveal animation */
.reveal { opacity:0; transform:translateY(25px); transition:opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity:1; transform:translateY(0); }

/* Footer */
.site-footer { margin-top:40px; padding:var(--gap); background:var(--card); border-top:1px solid var(--border); font-size:.75rem; line-height:1.4; text-align:center; }
.site-footer a { color:var(--accent); text-decoration:none; }
.site-footer a:hover, .site-footer a:focus { text-decoration:underline; }
.footer-links { margin:var(--space-sm) 0 0; }
.jump-top { font-weight:600; }

/* Responsive layout for mobile view */
@media (max-width: 768px) {
    .page { max-width:var(--container-mobile); padding:0 var(--space-sm) 30px; }
    header.site-header { height:var(--header-mobile); }
    nav.site-menu { margin-top:0; height:var(--menu-mobile); display:flex; align-items:center; padding:0 var(--space-sm); }
    nav.site-menu ul { width:100%; display:flex; flex-wrap:nowrap; }
    nav.site-menu li { margin:0; flex:1 1 0; height:var(--menu-mobile); display:flex; align-items:center; justify-content:center; padding:0 4px; line-height:1; border-radius:0; border:0; font-size:.85rem; border-right:1px solid var(--border); }
    nav.site-menu li:last-child { border-right:0; }
    .layout-grid { display:block; }
    .grid-image, .grid-right, .grid-subtext, .grid-content { margin-bottom:var(--gap); }
    .image-block img { max-width:320px; width:100%; }
}

@media (max-width:480px){
    .theme-toggle { top:10px; right:10px; }
}

/* Typewriter effect */
.typewriter { font-size:0.95rem; line-height:1.5; min-height:140px; position:relative; white-space:pre-wrap; }
.typewriter.caret::after { content:""; display:inline-block; width:8px; height:1em; background:var(--accent); margin-left:2px; animation:blink 1s steps(1,end) infinite; vertical-align:bottom; }
@keyframes blink { 50% { opacity:0; } }
.hidden { display:none !important; }
.typewriter .highlight { font-weight:600; }