/* =========================================================================
   Modern Portfolio Styles — Final
   - Softer light palette, accessible contrast
   - Fixed nav toggle visibility & mechanics
   - Calmer theme toggle appearance
   ========================================================================= */

/* ----------------------- Design Tokens ----------------------- */
:root {
  /* Light theme palette (soft, no harsh white) */
  --bg: #f6f7f9;             /* was #ffffff */
  --bg-alt: #eef1f5;         /* was #f5f7fa */
  --surface: #ffffff;
  --surface-alt: #f3f6fb;    /* slightly gray card */
  --line: #d9e0ea;           /* softer border */
  --line-strong: #c5ced8;

  --text: #1a1f29;
  --text-soft: #596273;      /* a touch softer */
  --heading: #1c2430;

  --accent: #3d6af2;
  --accent-hover: #2856e6;
  --accent-soft: #e3ebff;    /* subtle accent wash */

  --warn: #dc2626;

  /* Elevation */
  --shadow-sm: 0 2px 4px -2px rgba(23,33,52,0.06), 0 4px 10px -2px rgba(23,33,52,0.05);
  --shadow-md: 0 4px 10px -2px rgba(23,33,52,0.10), 0 10px 28px -6px rgba(23,33,52,0.08);
  --shadow-lg: 0 6px 18px -2px rgba(23,33,52,0.16), 0 16px 40px -8px rgba(23,33,52,0.14);

  /* Radius & spacing */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 18px;
  --r-pill: 999px;

  --space-1: .375rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-100: .85rem;
  --fs-200: .95rem;
  --fs-300: 1rem;
  --fs-400: 1.125rem;
  --fs-500: clamp(1.4rem, 3.5vw, 1.9rem);
  --fs-600: clamp(2.1rem, 4vw, 2.8rem);

  /* Transitions */
  --ease: cubic-bezier(.16,.84,.44,1);
  --dur-fast: 140ms;
  --dur-med: 320ms;
  --dur-slow: 600ms;

  /* Layout width */
  --max-width: 1080px;
}

/* Dark theme overrides (soft neutrals, no pure black) */
:root[data-theme="dark"] {
  --bg: #0f1117;
  --bg-alt: #15171d;
  --surface: #1a1c22;
  --surface-alt: #22252c;
  --line: #2d3138;
  --line-strong: #3c4149;

  --text: #e5e9f2;
  --text-soft: #9aa5b5;
  --heading: #f1f5fa;

  --accent: #5c8dff;
  --accent-hover: #447aff;
  --accent-soft: #20355e;

  --shadow-sm: 0 2px 4px -2px rgba(0,0,0,0.5), 0 4px 10px -2px rgba(0,0,0,0.35);
  --shadow-md: 0 4px 12px -2px rgba(0,0,0,0.6), 0 12px 30px -6px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 20px -4px rgba(0,0,0,0.55), 0 18px 46px -8px rgba(0,0,0,0.55);
}

/* ----------------------- Base / Reset Enhancements ----------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  line-height: 1.6;
  background:
    radial-gradient(circle at 70% 10%, var(--surface-alt) 0%, var(--bg) 65%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--dur-med) var(--ease), color var(--dur-med) var(--ease);
}

body, header, .panel, .project-card, .skills-grid i, footer, nav,
.btn, .contact-links a, .theme-toggle, .project-card::before {
  transition:
    background-color var(--dur-med) var(--ease),
    color var(--dur-med) var(--ease),
    border-color var(--dur-med) var(--ease),
    box-shadow var(--dur-med) var(--ease),
    transform var(--dur-fast) var(--ease),
    opacity var(--dur-fast) linear;
}

img { display: block; max-width: 100%; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
a:hover { color: var(--accent-hover); }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ----------------------- Layout Wrappers ----------------------- */
.site-header,
.section,
.site-footer {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-6);
  position: relative;
}

.section-header { margin-bottom: var(--space-4); }

.section-header h2 {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-600);
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: .5px;
  color: var(--heading);
}

.section-divider {
  height: 2px;
  width: 120px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 4px;
  opacity: .5;
}
:root[data-theme="dark"] .section-divider { opacity: .7; }

.section:nth-of-type(odd)  { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 95%); }
.section:nth-of-type(even) { background: linear-gradient(180deg, var(--bg-alt) 0%, var(--bg) 95%); }

/* ----------------------- Header ----------------------- */
.site-header {
  padding-top: clamp(3rem, 8vw, 5.5rem);
  padding-bottom: var(--space-5);
  text-align: center;
  position: relative;
}

.header-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.avatar {
  width: clamp(110px, 18vw, 160px);
  aspect-ratio: 1/1;
  border-radius: 60%;
  object-fit: cover;
  border: 3px solid var(--accent-soft);
  box-shadow: var(--shadow-md);
}

.site-title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--heading);
  letter-spacing: .6px;
}

.tagline {
  margin: 0;
  position: relative;
  overflow: hidden;
  height: 1.6em;
  color: var(--text-soft);
  font-size: var(--fs-400);
  font-weight: 500;
  letter-spacing: .4px;
}

.tagline-text {
  display: inline-block;
  background: linear-gradient(90deg, var(--text-soft), var(--heading), var(--text-soft));
  -webkit-background-clip: text;
  color: transparent;
  background-size: 200% 100%;
  animation: gradientShift 12s linear infinite;
}
@keyframes gradientShift {
  0% { background-position: 200% 0; }
  100% { background-position: 0 0; }
}

/* Decorative header layers (kept subtle) */
header { position: relative; overflow: hidden; }
header::before {
  content: "";
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(700px 280px at 95% -10%, rgba(99,102,241,0.16), transparent 60%),
    radial-gradient(520px 220px at -10% 25%, rgba(34,211,238,0.10), transparent 55%);
}
header::after {
  content: "";
  position: absolute; top: -24px; left: -8%;
  width: 116%; height: 80px; pointer-events: none;
  background: linear-gradient(90deg, rgba(255,255,255,0.06), rgba(255,255,255,0));
  transform: rotate(-2deg); opacity: 0.6;
}
nav { position: relative; z-index: 1; }

/* ----------------------- Navigation ----------------------- */
.primary-nav { margin-top: var(--space-3); width: 100%; display: flex; justify-content: center; }

.nav-list {
  list-style: none;
  margin: 0;
  padding: .65rem;
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  background: rgba(255,255,255,0.55);  /* dimmed in light mode */
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}
:root[data-theme="dark"] .nav-list {
  background: rgba(26,28,34,0.7);
  border-color: var(--line-strong);
}

.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .55rem 1.1rem;
  font-weight: 500;
  font-size: var(--fs-300);
  border-radius: var(--r-pill);
  color: var(--text-soft);
  transition: background-color var(--dur-fast) var(--ease),
             color var(--dur-fast) var(--ease),
             transform var(--dur-fast) var(--ease);
}
.nav-list a:hover {
  color: var(--heading);
  transform: translateY(-3px);
  background: var(--accent-soft);
}
:root[data-theme="dark"] .nav-list a:hover { background: #253045; color: var(--text); }
.nav-list a:active { transform: translateY(0) scale(.94); }
.nav-list a:focus-visible { outline: 0; box-shadow: 0 0 0 3px var(--accent-soft); }

/* ----------------------- Panels / Common Cards ----------------------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.25rem, 3vw, 2rem);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.panel:hover { box-shadow: var(--shadow-lg); }
:root[data-theme="dark"] .panel { border-color: var(--line-strong); }

/* About specifics */
.about-panel p { margin-top: 0; margin-bottom: var(--space-3); color: var(--text); }
.highlight-list {
  margin: 0; padding-left: 1.1rem; list-style: none;
  display: flex; flex-direction: column; gap: .55rem;
  font-size: var(--fs-300); color: var(--text-soft);
}
.highlight-list .list-heading {
  margin: 0 0 .3rem; font-family: var(--font-sans); font-weight: 600;
  color: var(--heading); font-size: var(--fs-400);
}
.highlight-list li { position: relative; padding-left: .85rem; }
.highlight-list li::before {
  content: ''; position: absolute; left: 0; top: .65em;
  width: 6px; height: 6px; border-radius: 50%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover)); opacity: .8;
}

/* ----------------------- Projects ----------------------- */
.projects-grid {
  display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 640px) {
  .projects-grid { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }
}
.project-card {
  --pad: 1.75rem;
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--pad);
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
:root[data-theme="dark"] .project-card { border-color: var(--line-strong); }
.project-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 30% 20%, var(--accent-soft) 0%, transparent 55%);
  opacity: 0; pointer-events: none;
}
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--line-strong);
}
.project-card:hover::before { opacity: .22; }
.project-icon i { font-size: 3rem; color: #ff9900; filter: drop-shadow(0 4px 10px rgba(0,0,0,0.2)); }
.project-title {
  margin: 1rem 0 .5rem; font-size: 1.4rem; font-weight: 600; color: #7c1a1a; letter-spacing: .4px;
}
:root[data-theme="dark"] .project-title { color: #ffb4b4; }
.project-desc { margin: 0 0 1.25rem; color: var(--text-soft); font-size: var(--fs-300); }

/* ----------------------- Buttons ----------------------- */
.btn {
  --btn-bg: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .9rem 1.35rem; font-size: var(--fs-300); font-weight: 600; font-family: var(--font-sans);
  color: #fff; background: var(--btn-bg); border: none; border-radius: var(--r-md);
  cursor: pointer; position: relative; box-shadow: 0 4px 14px rgba(61,106,242,0.35); isolation: isolate;
}
.btn::after {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent)); opacity: 0;
  transition: opacity var(--dur-med) var(--ease); z-index: -1;
}
.btn:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(61,106,242,0.45); }
.btn:hover::after { opacity: .22; }
.btn:active { transform: translateY(0) scale(.95); }
.btn:focus-visible { outline: 0; box-shadow: 0 0 0 4px var(--accent-soft), 0 0 0 1px var(--accent); }
:root[data-theme="dark"] .btn { box-shadow: 0 6px 20px rgba(92,141,255,0.45); }

/* ----------------------- Skills ----------------------- */
.skills-grid {
  display: grid; gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
  align-items: center; justify-items: center; padding: var(--space-2);
}
.skills-grid i {
  font-size: clamp(2.2rem, 5vw, 2.8rem);
  display: flex; align-items: center; justify-content: center;
  width: 72px; height: 72px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: var(--shadow-sm);
  color: var(--accent-hover);
  transition: transform var(--dur-fast) var(--ease),
             background-color var(--dur-med) var(--ease),
             box-shadow var(--dur-med) var(--ease);
}
.skills-grid i:hover {
  transform: translateY(-6px) scale(1.08);
  background: linear-gradient(135deg, var(--accent-soft), var(--accent));
  color: #fff; box-shadow: var(--shadow-md);
}
:root[data-theme="dark"] .skills-grid i { border-color: var(--line-strong); }

/* ----------------------- Contact ----------------------- */
.contact-links {
  display: flex; justify-content: center; gap: var(--space-3);
  flex-wrap: wrap; margin-top: var(--space-3);
}
.contact-links a {
  --size: 62px;
  width: var(--size); height: var(--size);
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--surface-alt); border: 1px solid var(--line); border-radius: var(--r-pill);
  box-shadow: var(--shadow-sm); color: var(--text-soft); font-size: 1.75rem;
  transition: background-color var(--dur-med) var(--ease),
             color var(--dur-fast) var(--ease),
             transform var(--dur-fast) var(--ease),
             box-shadow var(--dur-med) var(--ease);
}
.contact-links a:hover {
  transform: translateY(-5px); box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--accent-soft), var(--accent)); color: #fff;
}
.contact-links a:active { transform: translateY(0) scale(.92); }
:root[data-theme="dark"] .contact-links a { border-color: var(--line-strong); }
.contact-links .fa-linkedin { color: #0a66c2; }
.contact-links .fa-envelope { color: var(--warn); }
.contact-links .fa-github   { color: #222; }
:root[data-theme="dark"] .contact-links .fa-github { color: var(--text-soft); }
.contact-links a:hover i { color: #fff; }

/* ----------------------- Footer ----------------------- */
.site-footer {
  text-align: center; padding: var(--space-5) var(--space-3) var(--space-6);
  font-size: var(--fs-200); color: var(--text-soft);
  background: var(--surface); border-top: 1px solid var(--line);
  margin-top: var(--space-6); box-shadow: var(--shadow-sm);
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}
.counter-box {
  display: inline-flex; align-items: center; gap: .75rem;
  background: var(--surface-alt); border: 1px solid var(--line); border-radius: var(--r-pill);
  padding: .5rem 1rem; box-shadow: var(--shadow-sm); margin-bottom: var(--space-3);
  transition: box-shadow var(--dur-med) var(--ease), background-color var(--dur-med) var(--ease);
}
.counter-box:hover { box-shadow: var(--shadow-md); }
.view-count { display: inline-flex; align-items: center; gap: .5rem; font-weight: 600; color: var(--text); font-size: var(--fs-300); }
.view-count i { color: var(--accent); font-size: var(--fs-400); }

/* ----------------------- Theme Toggle (calmer light mode) ----------------------- */
.theme-toggle {
  position: fixed; top: 16px; right: 16px;
  width: 56px; height: 56px; padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, rgba(255,255,255,0.8), rgba(245,247,250,0.55));
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  cursor: pointer; z-index: 1000;
  box-shadow: var(--shadow-md), 0 0 0 4px rgba(255,255,255,0.22) inset;
  color: var(--heading);
  transition: background-color var(--dur-med) var(--ease),
             color var(--dur-med) var(--ease),
             transform var(--dur-fast) var(--ease),
             box-shadow var(--dur-med) var(--ease),
             border-color var(--dur-med) var(--ease);
}
.theme-toggle:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(255,255,255,0.30) inset;
}
.theme-toggle:active { transform: translateY(0) scale(.94); }
:root[data-theme="dark"] .theme-toggle {
  background: linear-gradient(180deg, rgba(34,37,44,0.85), rgba(26,28,34,0.75));
  border-color: var(--line-strong); color: var(--text);
  box-shadow: var(--shadow-md), 0 0 0 4px rgba(255,255,255,0.05) inset;
}
.theme-toggle:focus-visible { outline: 0; box-shadow: 0 0 0 4px var(--accent-soft), 0 0 0 1px var(--accent); }
.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute; font-size: 1.25rem; line-height: 1;
  transition: opacity var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
}
:root[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0deg) scale(1); }
:root[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(-25deg) scale(.5); }
:root[data-theme="dark"] .theme-toggle .icon-sun  { opacity: 0; transform: rotate(25deg) scale(.5); }
:root[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }

/* ----------------------- Nav Toggle (visible on desktop + mobile) ----------------------- */
/* Input comes first in DOM, then label.button, then header… */
.nav-toggle-btn {
  position: fixed;            /* make it always visible */
  top: 16px; left: 16px;
  width: 46px; height: 46px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface-alt);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  cursor: pointer; z-index: 1100;    /* above theme toggle if they overlap on small screens */
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background-color .25s var(--ease), border-color .25s var(--ease);
}
.nav-toggle-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
:root[data-theme="light"] .nav-toggle-btn {
  background: rgba(255,255,255,0.85);
  border-color: rgba(0,0,0,0.12);
  box-shadow: 0 6px 18px rgba(0,0,0,0.06);
}
:root[data-theme="dark"] .nav-toggle-btn {
  background: rgba(34,37,44,0.78);
  border-color: rgba(255,255,255,0.15);
  box-shadow: 0 6px 18px rgba(0,0,0,0.45);
}

/* Hamburger bars — perfectly aligned */
.nav-toggle-btn span {
  display: block;
  width: 24px; height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease, background-color .25s ease;
}
.nav-toggle-btn span + span { margin-top: 0px; }

/* Morph to X when checked (input immediately precedes label) */
#nav-toggle:checked + .nav-toggle-btn span:nth-child(1) { transform: translateY(-7px) rotate(-45deg); }
#nav-toggle:checked + .nav-toggle-btn span:nth-child(2) { opacity: 0; }
#nav-toggle:checked + .nav-toggle-btn span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----------------------- Mobile Menu Mechanics (FIXED SELECTOR) ----------------------- */
/* Collapse the nav list by default on small screens */
@media (max-width: 768px) {
  /* add top space so fixed buttons don’t overlap header content */
  header.site-header { padding-top: 78px; }

  .primary-nav .nav-list {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .3s ease, opacity .25s ease;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

  /* IMPORTANT: target the nav inside header which is a general sibling of the input */
  #nav-toggle:checked ~ .site-header .primary-nav .nav-list {
    max-height: 420px;
    opacity: 1;
  }
}

/* ----------------------- Responsive ----------------------- */
@media (max-width: 820px) {
  .section { padding-block: var(--space-5); }
  .panel { padding: 1.35rem 1.35rem 1.4rem; }
  .projects-grid { gap: var(--space-3); }
  .site-footer { padding: var(--space-5) var(--space-2) var(--space-6); }
  .theme-toggle { width: 54px; height: 54px; }
}

@media (max-width: 560px) {
  .nav-list { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .nav-list::-webkit-scrollbar { display: none; }
  .skills-grid { grid-template-columns: repeat(auto-fit, minmax(60px, 1fr)); }
  .project-card { --pad: 1.25rem; }
}

/* ----------------------- Reduced Motion ----------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}