/* =========================================================
   StraightLINE Consults — StraightLINE Top 300 Drugs
   Typography: Calisto MT throughout
   Color Palette: Orange (#FF6A1C), Complementary Browns (#4A2E1B, #2E1A0D), Black & White
   Supports: Light & Dark Modes, Fully Responsive
   ========================================================= */

/* ── 1. Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&display=swap');

/* ── 2. Design Tokens ─────────────────────────────────── */
:root {
  /* Core Brand Colors */
  --clr-orange:       #FF6A1C;
  --clr-orange-light: #FF8542;
  --clr-orange-dark:  #D4540F;
  --clr-orange-glow:  rgba(255, 106, 28, 0.28);

  /* Complementary Browns */
  --clr-brown-dark:   #2E1A0D;
  --clr-brown:        #4A2E1B;
  --clr-brown-mid:    #6B4226;
  --clr-brown-light:  #8C5D3D;
  --clr-brown-tint:   #F5EFEB;

  /* Typography: Calisto MT as requested */
  --font-primary: 'Calisto MT', 'Libre Baskerville', Georgia, 'Times New Roman', serif;

  /* Spacing Scale */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  2rem;
  --space-xl:  3.5rem;
  --space-2xl: 6rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow:   500ms ease;

  /* Shadows */
  --shadow-sm:  0 2px 6px rgba(0, 0, 0, 0.08);
  --shadow-md:  0 6px 20px rgba(0, 0, 0, 0.12);
  --shadow-lg:  0 14px 45px rgba(0, 0, 0, 0.18);
  --shadow-orange: 0 8px 30px rgba(255, 106, 28, 0.32);
}

/* ── 3. Light Theme ───────────────────────────────────── */
:root, [data-theme="light"] {
  --bg-primary:    #FAF8F5;
  --bg-secondary:  #F2EBE4;
  --bg-card:       #FFFFFF;
  --bg-nav:        rgba(250, 248, 245, 0.92);

  --text-primary:  #140E0A;
  --text-secondary:#4A382D;
  --text-muted:    #7D6B60;
  --text-inverse:  #FFFFFF;

  --border:        rgba(74, 46, 27, 0.12);
  --divider:       rgba(74, 46, 27, 0.08);

  --hero-gradient: linear-gradient(140deg, #FAF8F5 0%, #F5EDE6 55%, #FDEEE4 100%);
  --card-gradient: linear-gradient(150deg, #FFFFFF 0%, #FAF5F0 100%);
  --img-frame-bg:  #FFFFFF;
}

/* ── 4. Dark Theme ────────────────────────────────────── */
[data-theme="dark"] {
  --bg-primary:    #0D0907;
  --bg-secondary:  #18100B;
  --bg-card:       #20150F;
  --bg-nav:        rgba(13, 9, 7, 0.94);

  --text-primary:  #FAF5F0;
  --text-secondary:#D6C4B8;
  --text-muted:    #9E8B7F;
  --text-inverse:  #0D0907;

  --border:        rgba(255, 255, 255, 0.10);
  --divider:       rgba(255, 255, 255, 0.06);

  --hero-gradient: linear-gradient(140deg, #0D0907 0%, #1A0F08 55%, #291407 100%);
  --card-gradient: linear-gradient(150deg, #20150F 0%, #291A13 100%);
  --img-frame-bg:  #FFFFFF;
}

/* ── 5. Reset & Global Base ───────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  font-family: var(--font-primary);
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-primary);
}

/* ── 6. Utility Classes ───────────────────────────────── */
.container {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section {
  padding-block: var(--space-2xl);
}

.text-orange { color: var(--clr-orange); }
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }

/* ── 7. Section Labels & Headers ──────────────────────── */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-orange);
  margin-bottom: var(--space-md);
  font-family: var(--font-primary);
}

.section-label::before,
.section-label::after {
  content: '';
  display: block;
  height: 2px;
  width: 24px;
  background: var(--clr-orange);
  opacity: 0.8;
}

.section-label--light {
  color: #FFFFFF;
}

.section-label--light::before,
.section-label--light::after {
  background: rgba(255, 255, 255, 0.6);
}

.heading-xl {
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-family: var(--font-primary);
}

.heading-lg {
  font-size: clamp(1.8rem, 3.4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-family: var(--font-primary);
}

.heading-md {
  font-size: clamp(1.2rem, 1.8vw, 1.45rem);
  font-weight: 700;
  line-height: 1.35;
  font-family: var(--font-primary);
}

.subheading {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 60ch;
  font-family: var(--font-primary);
}

/* ── 8. Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.9em 2.2em;
  border-radius: var(--radius-full);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn--lg {
  padding: 1.1em 2.6em;
  font-size: 1.1rem;
}

.btn--primary {
  background: var(--clr-orange);
  color: #FFFFFF;
  box-shadow: var(--shadow-orange);
  border: 2px solid var(--clr-orange);
}

.btn--primary:hover {
  background: var(--clr-orange-dark);
  border-color: var(--clr-orange-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(255, 106, 28, 0.45);
}

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

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--clr-brown);
}

[data-theme="dark"] .btn--outline {
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--text-primary);
}

.btn--outline:hover {
  border-color: var(--clr-orange);
  color: var(--clr-orange);
  transform: translateY(-2px);
  background: rgba(255, 106, 28, 0.06);
}

/* ── 9. Navbar ───────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--divider);
  transition: all var(--transition-normal);
}

#navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: var(--space-lg);
}

.navbar__logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.navbar__logo img {
  height: 44px;
  width: auto;
  object-fit: contain;
  transition: opacity var(--transition-fast);
}

.navbar__logo:hover img {
  opacity: 0.85;
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar__nav a {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding-block: 4px;
}

.navbar__nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-orange);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.navbar__nav a:hover {
  color: var(--clr-orange);
}

.navbar__nav a:hover::after {
  width: 100%;
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Theme Toggle Button */
#theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  background: var(--bg-card);
}

#theme-toggle:hover {
  border-color: var(--clr-orange);
  color: var(--clr-orange);
  transform: rotate(20deg);
}

.icon-sun, .icon-moon {
  width: 20px;
  height: 20px;
  transition: all var(--transition-normal);
}

[data-theme="dark"] .icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Mobile Hamburger */
#hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

#hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

#hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu Drawer */
#mobile-menu {
  display: none;
  position: fixed;
  top: 76px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: var(--space-xl) var(--space-lg);
  flex-direction: column;
  gap: var(--space-lg);
  z-index: 999;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

#mobile-menu.open {
  display: flex;
  transform: translateX(0);
}

#mobile-menu a {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--divider);
  padding-bottom: var(--space-md);
  transition: color var(--transition-fast);
}

#mobile-menu a:hover {
  color: var(--clr-orange);
}

/* ── 10. Hero Section: Top 300 Drugs ──────────────────── */
.hero-top300 {
  min-height: calc(100vh - 76px);
  display: flex;
  align-items: center;
  background: var(--hero-gradient);
  padding-top: calc(76px + var(--space-xl));
  padding-bottom: var(--space-2xl);
  position: relative;
  overflow: hidden;
}

.hero__bg-shape {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero__bg-shape--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 106, 28, 0.15) 0%, transparent 70%);
  top: -120px;
  right: -100px;
  animation: pulse-slow 9s ease-in-out infinite;
}

.hero__bg-shape--2 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(74, 46, 27, 0.12) 0%, transparent 70%);
  bottom: -60px;
  left: -80px;
  animation: pulse-slow 11s ease-in-out infinite reverse;
}

.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--divider) 1px, transparent 1px),
    linear-gradient(90deg, var(--divider) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 75% 75% at 50% 50%, black 25%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 75% 75% at 50% 50%, black 25%, transparent 100%);
}

.hero-top300__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-top300__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero-top300__title {
  margin-bottom: var(--space-xs);
}

.hero-top300__body {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: var(--space-md);
}

.hero-top300__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-top300__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-top300__image-wrapper {
  background: var(--img-frame-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.hero-top300__image-wrapper:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(74, 46, 27, 0.2);
}

[data-theme="dark"] .hero-top300__image-wrapper:hover {
  box-shadow: 0 20px 50px rgba(255, 106, 28, 0.15);
}

.hero-top300__img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  display: block;
}

/* ── 11. Features Section ─────────────────────────────── */
#features {
  background: var(--bg-secondary);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
}

.features__header {
  text-align: center;
  max-width: 650px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  background: var(--card-gradient);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-orange), var(--clr-brown-mid));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255, 106, 28, 0.35);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card__icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(255, 106, 28, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  transition: background var(--transition-normal);
}

.feature-card:hover .feature-card__icon {
  background: rgba(255, 106, 28, 0.22);
}

.feature-card__icon svg {
  width: 26px;
  height: 26px;
  color: var(--clr-orange);
}

.feature-card__title {
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.feature-card__body {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ── 12. Testimonials (Student Voices) ────────────────── */
#testimonials {
  background: var(--bg-primary);
}

.testimonials__header {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.testimonial-card {
  background: var(--card-gradient);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 106, 28, 0.25);
}

.testimonial-card__quote {
  font-size: 2.8rem;
  color: var(--clr-orange);
  line-height: 0.8;
  opacity: 0.6;
}

.testimonial-card__text {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-style: italic;
  flex: 1;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  border-top: 1px solid var(--divider);
  padding-top: var(--space-md);
}

.testimonial-card__avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-orange), var(--clr-brown));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #FFFFFF;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.testimonial-card__name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.testimonial-card__role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.stars {
  color: var(--clr-orange);
  font-size: 0.88rem;
  letter-spacing: 2px;
}

/* ── 13. CTA Banner (Get Started) ─────────────────────── */
.cta-banner {
  background: linear-gradient(135deg, var(--clr-brown-dark) 0%, #000000 65%, #241106 100%);
  color: #FFFFFF;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-block: var(--space-2xl);
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 25% 50%, rgba(255, 106, 28, 0.20) 0%, transparent 60%),
    radial-gradient(circle at 75% 50%, rgba(74, 46, 27, 0.35) 0%, transparent 60%);
}

.cta-banner .container {
  position: relative;
  z-index: 1;
}

.cta-banner__title {
  color: #FFFFFF;
  max-width: 26ch;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
}

.cta-banner__actions {
  display: flex;
  justify-content: center;
}

/* ── 14. Footer ───────────────────────────────────────── */
#footer {
  background: #000000;
  color: rgba(255, 255, 255, 0.6);
  padding-block: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
}

.footer__logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.footer__logo img {
  height: 36px;
  width: auto;
  object-fit: contain;
  opacity: 0.9;
  transition: opacity var(--transition-fast);
}

.footer__logo:hover img {
  opacity: 1;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer__links a {
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  transition: color var(--transition-fast);
  color: rgba(255, 255, 255, 0.7);
}

.footer__links a:hover {
  color: var(--clr-orange);
}

.footer__copy {
  font-size: 0.82rem;
  width: 100%;
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: var(--space-lg);
}

/* ── 15. Scroll Animations ────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ── 16. Keyframe Animations ──────────────────────────── */
@keyframes pulse-slow {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.08); opacity: 0.85; }
}

/* ── 17. Responsive Breakpoints ───────────────────────── */
@media (max-width: 992px) {
  .hero-top300__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-top300__content {
    align-items: center;
  }

  .hero-top300__cta {
    justify-content: center;
  }

  .hero-top300__visual {
    max-width: 520px;
    margin-inline: auto;
  }
}

@media (max-width: 768px) {
  .navbar__nav          { display: none; }
  .navbar__actions .btn { display: none; }
  #hamburger            { display: flex; }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .testimonials__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --space-2xl: 4rem;
    --space-xl:  2.5rem;
  }

  .hero-top300__cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-top300__cta .btn {
    width: 100%;
  }

  .cta-banner__actions .btn {
    width: 100%;
  }
}

/* ── 18. Focus Visible & Selection ────────────────────── */
:focus-visible {
  outline: 2px solid var(--clr-orange);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background: rgba(255, 106, 28, 0.25);
  color: var(--clr-orange-dark);
}

/* ── 19. Custom Scrollbar ─────────────────────────────── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb {
  background: var(--clr-orange);
  border-radius: var(--radius-full);
}