/* ======================================================
   FONTS
====================================================== */
@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url("../assets/fonts/Montserrat-Light.ttf") format("truetype");
}

@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../assets/fonts/Montserrat-Medium.ttf") format("truetype");
}

@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../assets/fonts/Montserrat-Bold.ttf") format("truetype");
}

/* Fallback mappings for old font-family names */
@font-face {
  font-family: "Montserrat Light";
  src: url("../assets/fonts/Montserrat-Light.ttf") format("truetype");
  font-display: swap;
}
@font-face {
  font-family: "Montserrat Medium";
  src: url("../assets/fonts/Montserrat-Medium.ttf") format("truetype");
  font-display: swap;
}
@font-face {
  font-family: "Montserrat Bold";
  src: url("../assets/fonts/Montserrat-Bold.ttf") format("truetype");
  font-display: swap;
}

/* ======================================================
   THEME TOKENS
====================================================== */
:root,
[data-theme="dark"] {
  /* Surface Colors */
  --bg-primary: #0d0d0d;
  --bg-secondary: #171717;
  --bg-surface: #1f1f1f;
  --bg-overlay: rgba(13, 13, 13, 0.85);

  --text-primary: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;

  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.2);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);

  /* Primary Brand Accent (Crimson Red for Portfolio) */
  --color-primary: #e53935;
  --color-primary-hover: #ef5350;
  --color-primary-light: #ff6b6b;
  --accent-primary: #e53935;
  --accent-hover: #ef5350;
  --accent-glow: rgba(229, 57, 53, 0.25);

  /* Project Accent Default */
  --project-netlink-color: #006145;
  --netlink-accent-primary: #10b981;
  --netlink-accent-hover: #34d399;
  --netlink-accent-glow: rgba(16, 185, 129, 0.35);
  --project-orbistore-color: #5b33d7; /* Deep Blue for Orbistore */
  --orbistore-accent-primary: #5b33d7;
  --orbistore-accent-hover: #7c4dff;
  --orbistore-accent-glow: rgba(91, 51, 215, 0.55);
  --project-medsoft-color: #0071bc; /* Deep Blue for Medsoft */
  --medsoft-accent-primary: #0071bc;
  --medsoft-accent-hover: #3399ff;
  --medsoft-accent-glow: rgba(0, 113, 188, 0.55);

  /* Deprecated compatibility aliases */
  --color-bg-primary: var(--bg-primary);
  --color-bg-secondary: var(--bg-secondary);
  --color-bg-surface: var(--bg-surface);
  --color-bg-overlay: var(--bg-overlay);
  --color-bg-white: #ffffff;
  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-text-muted: var(--text-muted);
  --color-border: var(--border-color);
  --color-border-light: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] {
  /* Surface Colors */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-surface: #f1f5f9;
  --bg-overlay: rgba(248, 250, 252, 0.88);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --border-color: rgba(15, 23, 42, 0.12);
  --border-hover: rgba(15, 23, 42, 0.25);
  --shadow-card: 0 10px 25px rgba(15, 23, 42, 0.06);

  /* Primary Brand Accent (Deep Crimson Red for Light Mode) */
  --color-primary: #c62828;
  --color-primary-hover: #b91c1c;
  --color-primary-light: #e53935;
  --accent-primary: #c62828;
  --accent-hover: #b91c1c;
  --accent-glow: rgba(198, 40, 40, 0.15);

  /* Netlink Project Accent */
  --project-netlink-color: #006145;
  --netlink-accent-primary: #006145;
  --netlink-accent-hover: #047857;
  --netlink-accent-glow: rgba(0, 97, 69, 0.15);

  /* Orbistore Project Accent */
  --project-orbistore-color: #5b33d7;
  --orbistore-accent-primary: #5b33d7;
  --orbistore-accent-hover: #7c4dff;
  --orbistore-accent-glow: rgba(91, 51, 215, 0.15);

  /* Medsoft Project Accent */
  --project-medsoft-color: #0071bc;
  --medsoft-accent-primary: #0071bc;
  --medsoft-accent-hover: #3399ff;
  --medsoft-accent-glow: rgba(0, 113, 188, 0.15);

  /* Deprecated compatibility aliases */
  --color-bg-primary: var(--bg-primary);
  --color-bg-secondary: var(--bg-secondary);
  --color-bg-surface: var(--bg-surface);
  --color-bg-overlay: var(--bg-overlay);
  --color-bg-white: #ffffff;
  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-text-muted: var(--text-muted);
  --color-border: var(--border-color);
  --color-border-light: rgba(15, 23, 42, 0.06);
}

/* Global System Variables */
:root {
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  --font-primary: "Montserrat", sans-serif;

  /* Font Sizes */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-md: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 2rem;
  --fs-4xl: 2.5rem;
  --fs-5xl: 3rem;
  --fs-6xl: 4rem;

  /* Font Weights */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-black: 900;

  /* Line Heights */
  --lh-tight: 1.2;
  --lh-heading: 1.3;
  --lh-body: 1.6;
  --lh-loose: 1.8;

  /* Letter Spacing */
  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;

  /* Spacing Tokens */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Border Width */
  --border-thin: 1px;
  --border-medium: 2px;
  --border-thick: 3px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.18);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.24);

  /* Blur */
  --blur-sm: 8px;
  --blur-md: 12px;
  --blur-lg: 18px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.45s ease;

  /* Z-Index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-header: 1000;
  --z-modal: 2000;
  --z-toast: 3000;
  --z-tooltip: 4000;

  /* Layout */
  --container-width: 1200px;
  --section-spacing: 7rem;
  --header-height: 5rem;
}

/* ======================================================
   GLOBAL ACCESSIBILITY KEYBOARD FOCUS INDICATOR
====================================================== */
*:focus-visible {
  outline: 2px solid var(--accent-primary) !important;
  outline-offset: 4px !important;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible,
.project-link:focus-visible,
.contact-item:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px !important;
  box-shadow: 0 0 0 4px var(--accent-glow);
  border-radius: var(--radius-sm);
}

/* Smooth Theme Transitions */
html {
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

body,
header,
section,
.service-text,
.skill-category,
.project-card,
.project-content,
.meta-item,
.about-card,
.nav-link,
.theme-toggle {
  transition: background-color var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

/* Theme Toggle Button Icons Visibility */
[data-theme="dark"] .sun-icon {
  display: flex;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
[data-theme="light"] .sun-icon {
  display: none;
}
[data-theme="light"] .moon-icon {
  display: flex;
}

.theme-toggle {
  background: none;
  border: none;
  padding: 0.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  border-radius: var(--radius-md);
}

.theme-toggle svg {
  fill: var(--text-primary);
  transition: fill var(--transition-normal), transform var(--transition-normal);
}

.theme-toggle:hover svg {
  fill: var(--color-primary);
  transform: scale(1.15);
}

/* ======================================================
   HEADER & NAVIGATION COMPONENT (SHARED ACROSS ALL PAGES)
====================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  backdrop-filter: var(--blur-lg);
  background: var(--bg-overlay);
  border-bottom: 1px solid var(--border-color);
  transition: padding var(--transition-slow), background var(--transition-slow), box-shadow var(--transition-slow);
}

.header.scrolled {
  padding: 0.7rem 0;
  background: var(--bg-overlay);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: var(--container-width);
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-primary);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  letter-spacing: var(--tracking-tight);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 3rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  position: relative;
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition-normal);
  font-family: var(--font-primary);
  font-weight: var(--fw-medium);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  transform: translateX(-50%);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn svg {
  margin: 0;
  fill: var(--text-primary);
  transition: fill var(--transition-normal);
}

.icon-btn:hover svg {
  fill: var(--color-primary);
}

.resume-btn,
.portfolio-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  background: var(--color-primary);
  color: #ffffff;
  font-weight: var(--fw-semibold);
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-sm);
}

.resume-btn svg,
.portfolio-btn svg {
  margin: 0;
  fill: #ffffff;
  transition: fill var(--transition-slow), transform var(--transition-slow);
}

.resume-btn:hover,
.portfolio-btn:hover {
  transform: translateY(-2px);
  background: var(--color-primary-hover);
  color: #ffffff;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 6px;
}

.menu-toggle span {
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-normal);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  width: 100%;
}

/* PROGRESS BAR */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 9999;
  background: var(--color-primary);
}

/* RESPONSIVE NAVIGATION */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
  }
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: start;
    justify-content: center;
    text-align: left;
    background: var(--bg-primary);
    transition: var(--transition-slow);
    box-sizing: border-box;
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
    visibility: hidden;
    padding-left: 2rem;
  }
  .nav.active {
    opacity: 1;
    transform: none;
    pointer-events: auto;
    visibility: visible;
    right: 0;
  }
  .nav-list {
    flex-direction: column;
    align-items: start;
    gap: 2rem;
  }
  .nav-link {
    font-size: var(--fs-2xl);
  }
  .header-actions {
    flex-direction: row;
    gap: 1.5rem;
    justify-content: space-between;
    align-items: center;
  }
}