/* Mobile-first styles for NewsWave */
:root{
  /* Design tokens keep color, radius, spacing, and motion consistent across components. */
  --bg: #f7f8fb;
  --bg-accent: #fff5f5;
  --surface: #ffffff;
  --surface-elevated: rgba(255,255,255,0.9);
  --primary: #c81e1e;
  --primary-hover: #991b1b;
  --primary-soft: rgba(200,30,30,0.1);
  --text: #111827;
  --text-secondary: #374151;
  --muted: #5f6b7a;
  --border: #dfe3ea;
  --ring: rgba(200,30,30,0.22);
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --transition: 220ms ease-out;
  --card-shadow: 0 1px 2px rgba(17,24,39,0.06), 0 12px 32px rgba(17,24,39,0.08);
  --card-shadow-hover: 0 18px 44px rgba(17,24,39,0.14);
  --header-blur: saturate(180%) blur(16px);
  --body-size: clamp(1rem, 0.96rem + 0.18vw, 1.0625rem);
  --h1-size: clamp(1.75rem, 1.22rem + 2.2vw, 3rem);
  --h2-size: clamp(1.35rem, 1.05rem + 1.25vw, 2.25rem);
  --card-title-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
}

.dark{
  --bg: #080a0f;
  --bg-accent: #1f1111;
  --surface: #151821;
  --surface-elevated: rgba(21,24,33,0.9);
  --primary: #f05252;
  --primary-hover: #f87171;
  --primary-soft: rgba(240,82,82,0.14);
  --text: #f9fafb;
  --text-secondary: #e5e7eb;
  --muted: #b8c0cc;
  --border: rgba(255,255,255,0.1);
  --ring: rgba(240,82,82,0.32);
  --card-shadow: 0 1px 2px rgba(0,0,0,0.35), 0 14px 38px rgba(0,0,0,0.28);
  --card-shadow-hover: 0 18px 48px rgba(0,0,0,0.42);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;text-size-adjust:100%}
html,body{min-height:100%}
body{
  font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background:
    radial-gradient(circle at top left, var(--bg-accent), transparent 34rem),
    var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.6;
  font-size:var(--body-size);
}
img{max-width:100%}
a{color:inherit}
button,input{font:inherit}
.container{width:min(100% - 32px, 1200px);margin:0 auto}

.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[x-cloak]{display:none!important}

/* Header */
.site-header{background:var(--surface-elevated);backdrop-filter:var(--header-blur);-webkit-backdrop-filter:var(--header-blur);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:40;transition:background var(--transition),border-color var(--transition)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) 0;gap:var(--space-4)}
.brand{display:flex;align-items:center;min-width:0}
.logo{display:flex;align-items:center;text-decoration:none;color:inherit;gap:var(--space-3);border-radius:var(--radius-sm)}
.logo svg{flex:0 0 auto;filter:drop-shadow(0 6px 12px rgba(200,30,30,0.22))}
.site-title{font-weight:700;font-size:clamp(1.25rem, 1.12rem + 0.55vw, 1.6rem);font-family:'Playfair Display', Georgia, serif;letter-spacing:-0.03em;line-height:1.1}

.main-nav{display:flex;align-items:center;gap:var(--space-2)}
.nav-links{display:none;list-style:none;gap:var(--space-1)}
.nav-links li a{color:var(--muted);text-decoration:none;padding:var(--space-2) var(--space-3);border-radius:999px;font-size:0.9rem;font-weight:600;transition:color var(--transition),background var(--transition),transform var(--transition)}
.nav-links li a:hover,.nav-links li a:focus-visible{color:var(--text);background:var(--primary-soft);transform:translateY(-1px)}
.nav-toggle,.mode-toggle{background:transparent;border:1px solid transparent;color:var(--text);font-size:1.1rem;padding:var(--space-2);min-width:44px;min-height:44px;cursor:pointer;border-radius:999px;transition:background var(--transition),border-color var(--transition),transform var(--transition)}
.nav-toggle:hover,.mode-toggle:hover{background:var(--primary-soft);border-color:var(--border);transform:translateY(-1px)}
.nav-toggle:active,.mode-toggle:active,.btn:active,.back-top:active{transform:translateY(0) scale(0.98)}
.header-actions{display:flex;align-items:center}

/* Drawer */
.nav-drawer{position:fixed;left:0;top:0;bottom:0;width:min(84vw, 320px);background:var(--surface);box-shadow:16px 0 44px rgba(17,24,39,0.18);transform:translateX(-100%);transition:transform var(--transition);z-index:50}
.nav-drawer.open{transform:translateX(0)}
.drawer-inner{padding:var(--space-6) var(--space-5)}
.drawer-close{background:transparent;border:1px solid var(--border);font-size:1.1rem;padding:var(--space-2);min-width:44px;min-height:44px;cursor:pointer;color:var(--text);border-radius:999px;transition:background var(--transition),border-color var(--transition)}
.drawer-close:hover{background:var(--primary-soft);border-color:var(--primary)}
.nav-drawer ul{list-style:none;margin:var(--space-5) 0 0}
.nav-drawer li{margin:var(--space-1) 0}
.nav-drawer a{text-decoration:none;color:var(--text);display:block;padding:var(--space-3) var(--space-4);border-radius:var(--radius-sm);font-weight:600;transition:background var(--transition),color var(--transition),transform var(--transition)}
.nav-drawer a:hover{background:var(--primary-soft);color:var(--primary);transform:translateX(2px)}

/* Sticky search */
.sticky-search{background:transparent;position:sticky;top:61px;z-index:30;transition:background var(--transition),box-shadow var(--transition)}
.sticky-search.sticky{background:var(--surface-elevated);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 10px 28px rgba(17,24,39,0.08)}
.sticky-search .search-inner{display:flex;padding:var(--space-3) 0}
.sticky-search form{position:relative;width:100%}
.sticky-search input[type="search"]{width:100%;padding:var(--space-3) 48px var(--space-3) var(--space-4);border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:0.95rem;box-shadow:0 1px 2px rgba(17,24,39,0.05);transition:border-color var(--transition),box-shadow var(--transition),background var(--transition)}
.sticky-search input[type="search"]::placeholder{color:var(--muted)}
.sticky-search input[type="search"]:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px var(--ring),0 8px 20px rgba(17,24,39,0.08)}
.search-spinner{position:absolute;right:16px;top:50%;width:20px;height:20px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;transform:translateY(-50%);display:inline-block}

/* Hero */
.hero{margin-top:var(--space-6)}
.hero-card{display:flex;align-items:flex-end;color:#fff;min-height:clamp(260px, 42vw, 460px);background-size:cover;background-position:center;border-radius:var(--radius-lg);padding:var(--space-5);overflow:hidden;position:relative;box-shadow:var(--card-shadow);isolation:isolate;transition:transform var(--transition),box-shadow var(--transition)}
.hero-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, transparent 30%, rgba(0,0,0,0.72));z-index:-1}
.hero-card:hover{transform:translateY(-2px);box-shadow:var(--card-shadow-hover)}
.hero-body{max-width:760px;padding:var(--space-2)}
.hero-title{font-family:'Playfair Display', Georgia, serif;font-size:var(--h2-size);line-height:1.15;letter-spacing:-0.025em;text-wrap:balance;text-shadow:0 2px 18px rgba(0,0,0,0.38)}
.meta{color:rgba(255,255,255,0.88);font-size:0.9rem;margin-top:var(--space-2);font-weight:600}
.hero-actions{margin-top:var(--space-4)}
.hero-skeleton{height:clamp(260px, 42vw, 460px);border-radius:var(--radius-lg);background:linear-gradient(90deg,var(--border),var(--surface),var(--border));background-size:200% 100%;animation:shimmer 1.4s linear infinite}

/* Grid */
.news-grid{margin:var(--space-6) 0 var(--space-10)}
.grid{display:grid;grid-template-columns:1fr;gap:var(--space-5)}
.card{background:var(--surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--card-shadow);transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition)}
.card:hover{transform:translateY(-6px);box-shadow:var(--card-shadow-hover);border-color:rgba(200,30,30,0.28);will-change:transform}
.card .thumb{width:100%;aspect-ratio:16/9;height:auto;object-fit:cover;background:var(--border);display:block;transition:transform 260ms ease-out,filter 260ms ease-out}
.card:hover .thumb{transform:scale(1.03);filter:saturate(1.05)}
.card-body{padding:var(--space-4) var(--space-5) var(--space-5)}
.category-badge{display:inline-flex;align-items:center;padding:var(--space-1) var(--space-3);border-radius:999px;font-size:0.7rem;font-weight:700;color:#fff;margin-bottom:var(--space-3);text-transform:uppercase;letter-spacing:0.05em;line-height:1.5}
.card-title{font-weight:700;font-size:var(--card-title-size);margin-bottom:var(--space-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.25;color:var(--text)}
.card-desc{color:var(--muted);font-size:0.92rem;margin-bottom:var(--space-4);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;line-height:1.55}
.card-meta{display:flex;justify-content:space-between;align-items:center;gap:var(--space-3);font-size:0.82rem;color:var(--muted);font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-hover));color:#fff;padding:var(--space-2) var(--space-4);border-radius:999px;text-decoration:none;border:1px solid transparent;cursor:pointer;font-weight:700;font-size:0.9rem;line-height:1.4;box-shadow:0 8px 18px rgba(200,30,30,0.22);transition:transform var(--transition),box-shadow var(--transition),background var(--transition),color var(--transition),border-color var(--transition)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 24px rgba(200,30,30,0.28)}
.btn.secondary{background:transparent;color:var(--primary);border-color:var(--primary);box-shadow:none}
.btn.secondary:hover{background:var(--primary);color:#fff;box-shadow:0 10px 22px rgba(200,30,30,0.2)}
.load-more{text-align:center;margin:var(--space-8) 0}

/* Footer */
.site-footer{padding:var(--space-8) 0;border-top:1px solid var(--border);background:var(--surface);margin-top:var(--space-10)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--space-3);font-size:0.9rem;color:var(--muted)}
.footer-inner a{color:var(--primary);font-weight:600;text-decoration:none;text-underline-offset:3px}
.footer-inner a:hover{text-decoration:underline}
.back-top{background:transparent;border:1px solid var(--border);padding:var(--space-2) var(--space-3);border-radius:999px;cursor:pointer;color:var(--muted);font-size:0.85rem;font-weight:700;transition:border-color var(--transition),color var(--transition),background var(--transition),transform var(--transition)}
.back-top:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-soft);transform:translateY(-1px)}

/* Category colors keep labels distinct while maintaining white text contrast. */
.badge-world{background:#1d4ed8}
.badge-technology{background:#6d28d9}
.badge-business{background:#047857}
.badge-sports{background:#c2410c}
.badge-health{background:#dc2626}
.badge-science{background:#0f766e}
.badge-entertainment{background:#be185d}

.hidden{display:none!important}

/* Animations */
@keyframes shimmer{0%{background-position:-200% 0}100%{background-position:200% 0}}

:focus-visible{outline:3px solid var(--ring);outline-offset:3px}
:focus:not(:focus-visible){outline:none}

/* Responsive */
@media(min-width:768px){
  .container{width:min(100% - 48px, 1200px)}
  .nav-links{display:flex}
  .nav-toggle{display:none}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-6)}
  .hero-card{padding:var(--space-8)}
}
@media(min-width:1200px){
  .grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* Respect users who prefer reduced motion and avoid unnecessary animation work. */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:0.01ms!important}
}