/* ============================================================
   main.css — Global Design System
   Aayush Bhatt Portfolio
   ============================================================ */

/* ─── 1. CSS Custom Properties ─── */
:root {
  /* Colors */
  --color-bg:           #000000;
  --color-bg-secondary: #3E3636;
  --color-bg-card:      #1a1414;
  --color-accent:       #D72323;
  --color-accent-hover: #ff2929;
  --color-text-primary: #F5EDED;
  --color-text-secondary: #a09898;
  --color-border:       rgba(245, 237, 237, 0.08);
  --color-border-hover: rgba(215, 35, 35, 0.35);

  /* Typography */
  --font-body: 'Nunito', 'Inter', sans-serif;
  --font-code: 'Cascadia Code', 'Space Mono', monospace;

  /* Font Sizes */
  --fs-xs:   0.75rem;    /* 12px */
  --fs-sm:   0.875rem;   /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-lg:   1.125rem;   /* 18px */
  --fs-xl:   1.25rem;    /* 20px */
  --fs-2xl:  1.5rem;     /* 24px */
  --fs-3xl:  2rem;       /* 32px */
  --fs-4xl:  2.75rem;    /* 44px */
  --fs-5xl:  3.75rem;    /* 60px */

  /* Font Weights */
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Spacing */
  --space-xs:  0.5rem;   /* 8px  */
  --space-sm:  1rem;     /* 16px */
  --space-md:  1.5rem;   /* 24px */
  --space-lg:  2rem;     /* 32px */
  --space-xl:  3rem;     /* 48px */
  --space-2xl: 5rem;     /* 80px */

  /* Animation */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-card:       0 4px 24px rgba(215, 35, 35, 0.08);
  --shadow-card-hover: 0 8px 40px rgba(215, 35, 35, 0.20);
  --shadow-glow:       0 0 60px rgba(215, 35, 35, 0.15);

  /* Layout */
  --max-width:      1100px;
  --navbar-height:  85px;
}

/* ─── 2. CSS Reset ─── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  scroll-behavior: auto !important;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

* {
  scroll-behavior: auto !important;
}

ul,
ol {
  list-style: none;
}

img,
picture,
video,
svg {
  display: block;
  max-width: 100%;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font: inherit;
}

input,
textarea {
  font: inherit;
  border: none;
  outline: none;
}

/* ─── 3. Base Styles ─── */
body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 237, 237, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 237, 237, 0.075) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: -1;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--fs-5xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-base); }

p {
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* ─── 4. Layout Utilities ─── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
  scroll-margin-top: var(--navbar-height);
}

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

.section-title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.section-title span {
  color: var(--color-accent);
}

.section-subtitle {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  max-width: 500px;
}

/* Flex helpers */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col     { display: flex; flex-direction: column; }
.gap-sm       { gap: var(--space-sm); }
.gap-md       { gap: var(--space-md); }
.gap-lg       { gap: var(--space-lg); }

/* Grid helpers */
.grid { display: grid; }

.visually-hidden {
  position: absolute;
  left: -9999px;
}

/* ─── 5. Reusable UI Components ─── */

/* Primary Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: #ffffff;
  padding: 0.8rem 2rem;
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  font-family: var(--font-body);
  transition:
    background var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Outline Button */
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--color-accent);
  padding: 0.8rem 2rem;
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  font-family: var(--font-body);
  border: 1.5px solid var(--color-accent);
  transition:
    background var(--transition-base),
    color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.btn-outline:active {
  transform: translateY(0);
}

/* Tech Tag / Badge */
.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-code);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  background: rgba(215, 35, 35, 0.10);
  color: var(--color-accent);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(215, 35, 35, 0.22);
  letter-spacing: 0.02em;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.tag i {
  margin-right: 0.5rem;
  font-size: 1.1em;
}

.tag:hover {
  background: rgba(215, 35, 35, 0.18);
  border-color: rgba(215, 35, 35, 0.45);
}

/* Card */
.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-hover);
}

/* Divider */
.divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

/* ─── 6. Fade-in Animation (used by js/animations.js in Phase 5) ─── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── 7. Scrollbar ─── */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-hover);
}

/* ─── 8. Text Selection ─── */
::selection {
  background: var(--color-accent);
  color: #ffffff;
}

/* ─── 9. Responsive Base ─── */
@media (max-width: 768px) {
  :root {
    --fs-4xl: 2.25rem;
    --fs-5xl: 2.75rem;
    --fs-3xl: 1.75rem;
    --space-2xl: 3.5rem;
  }

  .container {
    padding: 0 var(--space-sm);
  }
}

@media (max-width: 480px) {
  :root {
    --fs-4xl: 2rem;
    --fs-5xl: 2.25rem;
  }
}
/* ─── 8. Reveal Animations (Phase 6) ─── */
.reveal-hidden {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.reveal-visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* Delay modifiers */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
/* ============================================================
   projects.css — Featured Projects Section
   ============================================================ */

.projects__grid,
.achievements__grid,
.certificates__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* Bento Grid Utilities */
.grid-col-2 {
  grid-column: span 2;
}

.grid-row-2 {
  grid-row: span 2;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 0;
  overflow: hidden;
  background: var(--color-bg-card);
}

/* ─── Card Image ─── */
.project-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #111;
  position: relative;
  overflow: hidden;
}

.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1414 0%, #3E3636 100%);
  color: var(--color-accent);
  font-family: var(--font-code);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: transform var(--transition-base);
}

.project-card:hover .project-card__placeholder {
  transform: scale(1.1);
}

/* ─── Card Content ─── */
.project-card__content {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-card__header {
  margin-bottom: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-card__title {
  font-size: var(--fs-xl);
  color: var(--color-text-primary);
  margin-bottom: 0;
}

.project-card__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  flex: 1;
}

/* Tech Tags in Card */
.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-lg);
}

/* Links in Card */
.project-card__links {
  display: flex;
  gap: var(--space-md);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}

.project-card__links .nav-link {
  font-size: var(--fs-xs);
  font-family: var(--font-code);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── Section Footer ─── */
.projects__cta {
  margin-top: var(--space-2xl);
  display: flex;
  justify-content: center;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .projects__grid {
    grid-template-columns: 1fr;
  }

  .grid-col-2,
  .grid-row-2 {
    grid-column: span 1;
    grid-row: span 1;
  }
}

/* ─── Projects Filter (Phase 5) ─── */
.projects-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-xl);
  justify-content: center;
}

.filter-btn {
  font-family: var(--font-code);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  background: transparent;
  color: var(--color-text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

.filter-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-accent);
}

.filter-btn.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ─── Projects Modal (Phase 5) ─── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(5px);
}

.modal__content {
  position: relative;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform var(--transition-base);
  z-index: 1001;
}

.modal:not(.hidden) .modal__content {
  transform: translateY(0);
}

.modal__close {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal__close:hover {
  color: #fff;
}

.modal__close:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  color: #fff;
}

.modal__body {
  padding: var(--space-xl);
}

.modal__body h2 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-xs);
}

.modal__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-lg);
}

.modal__body p {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}

.no-scroll {
  overflow: hidden;
}

/* Hidden state for filtering */
.hidden-card {
  display: none !important;
}

/* Modal High-Contrast Polish */
.modal__tech .tag {
  background: rgba(255, 59, 59, 0.15);
  color: #ff5f5f;
  border: 1px solid rgba(255, 59, 59, 0.3);
  font-weight: var(--fw-bold);
}

.modal .btn-primary {
  background: #ff3b3b;
  color: #fff;
  box-shadow: 0 0 20px rgba(255, 59, 59, 0.4);
}

.modal .btn-outline {
  border-color: #ff3b3b;
  color: #ff5f5f;
  background: transparent;
}

.modal .btn-outline:hover {
  background: rgba(255, 59, 59, 0.1);
}