/* ─────────────────────────────────────────────────────────────
   BudgetFlow Landing Page — styles.css
   Dark modern theme
───────────────────────────────────────────────────────────── */

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

:root {
  --bg:          #0a0a0f;
  --bg-2:        #0f0f1a;
  --bg-3:        #13131f;
  --surface:     #16162a;
  --surface-2:   #1c1c30;
  --border:      rgba(255,255,255,0.07);
  --border-2:    rgba(255,255,255,0.12);

  --accent:      #6c63ff;
  --accent-2:    #a78bfa;
  --accent-glow: rgba(108,99,255,0.35);
  --green:       #22d3a5;
  --red:         #ff5e7a;

  --text:        #f0f0f8;
  --text-2:      #a0a0b8;
  --text-3:      #6b6b88;

  --radius:      12px;
  --radius-lg:   20px;
  --radius-xl:   28px;

  --font:        'Inter', system-ui, -apple-system, sans-serif;

  --nav-h:       64px;
  --section-gap: 120px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Utilities ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section { padding: var(--section-gap) 0; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: rgba(108,99,255,0.12);
  border: 1px solid rgba(108,99,255,0.25);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  text-align: center;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 600px;
  margin: 0 auto 56px;
  text-align: center;
  line-height: 1.7;
}

.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(108,99,255,0.2);
  color: var(--accent-2);
  border: 1px solid rgba(108,99,255,0.3);
  padding: 2px 7px;
  border-radius: 100px;
  margin-left: 6px;
  vertical-align: middle;
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn--primary:hover {
  background: #7c74ff;
  box-shadow: 0 0 36px var(--accent-glow);
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-2);
}
.btn--secondary:hover {
  background: var(--surface);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-2);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent-2);
  transform: translateY(-1px);
}

.btn--sm { padding: 8px 16px; font-size: 0.875rem; }

/* ── Nav ──────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  gap: 32px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  flex-shrink: 0;
}

.logo-icon {
  color: var(--accent);
  font-size: 1.3rem;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav__links a {
  font-size: 0.9rem;
  color: var(--text-2);
  font-weight: 500;
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--text); }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  margin-left: auto;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: all 0.2s;
}

/* Mobile menu — hidden by default via [hidden] attribute.
   Only shown when JS removes [hidden] and adds .is-open */
.nav__mobile {
  display: none;  /* fallback hidden */
  flex-direction: column;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px 20px;
  gap: 0;
}
.nav__mobile.is-open {
  display: flex;
}
.nav__mobile a {
  padding: 12px 0;
  font-size: 1rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--border);
  font-weight: 500;
  transition: color 0.2s;
}
.nav__mobile a:last-child { border-bottom: none; }
.nav__mobile a:hover { color: var(--text); }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  /* push content below the fixed nav */
  padding-top: calc(var(--nav-h) + 40px);
  padding-bottom: 80px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
}
.hero__glow--1 {
  width: 600px; height: 600px;
  background: var(--accent);
  top: -100px; left: -100px;
}
.hero__glow--2 {
  width: 500px; height: 500px;
  background: var(--accent-2);
  bottom: -100px; right: -50px;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(34,211,165,0.1);
  border: 1px solid rgba(34,211,165,0.25);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero__desc {
  font-size: 1.1rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 480px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.hero__stats {
  display: flex;
  align-items: center;
  gap: 24px;
}

.hero__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero__stat-num {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.hero__stat-label {
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border-2);
}

/* Phone mockup */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  position: relative;
  display: flex;
  justify-content: center;
}

.phone-mockup__frame {
  position: relative;
  width: 260px;
  background: var(--surface);
  border-radius: 40px;
  border: 2px solid var(--border-2);
  padding: 14px 10px;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.04),
    0 40px 80px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(255,255,255,0.08);
}

.phone-mockup__notch {
  width: 80px;
  height: 8px;
  background: var(--bg);
  border-radius: 100px;
  margin: 0 auto 10px;
}

.phone-mockup__screen {
  border-radius: 28px;
  overflow: hidden;
  background: var(--bg);
  aspect-ratio: 9/19;
}

.phone-mockup__screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.phone-mockup__glow {
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 80px;
  background: var(--accent);
  filter: blur(40px);
  opacity: 0.25;
  border-radius: 50%;
}

/* ── Problem ──────────────────────────────────────────────── */
.problem { background: var(--bg-2); }

.problem .section-title,
.problem .section-label { text-align: center; }
.problem .section-label { display: block; text-align: center; }

.compare {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  max-width: 860px;
  margin: 0 auto;
}

.compare__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.compare__card--bad {
  border-color: rgba(255,94,122,0.2);
  background: rgba(255,94,122,0.04);
}

.compare__card--good {
  border-color: rgba(34,211,165,0.25);
  background: rgba(34,211,165,0.04);
}

.compare__icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.compare__card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.compare__card--bad h3 { color: var(--red); }
.compare__card--good h3 { color: var(--green); }

.compare__card ul { display: flex; flex-direction: column; gap: 10px; }

.compare__card li {
  font-size: 0.9rem;
  color: var(--text-2);
  padding-left: 20px;
  position: relative;
}

.compare__card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.compare__card--bad li::before { background: var(--red); opacity: 0.6; }
.compare__card--good li::before { background: var(--green); }

.compare__vs {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-3);
  text-align: center;
  flex-shrink: 0;
}

/* ── Solution ─────────────────────────────────────────────── */
.solution { background: var(--bg); }

.flow {
  display: flex;
  align-items: flex-start;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.flow__step {
  flex: 1;
  min-width: 160px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.flow__step:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.flow__num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.flow__icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.flow__step h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.flow__step p {
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.5;
}

.flow__arrow {
  flex-shrink: 0;
  font-size: 1.4rem;
  color: var(--text-3);
  padding: 0 8px;
  margin-top: 48px;
  align-self: flex-start;
}

/* ── Features ─────────────────────────────────────────────── */
.features { background: var(--bg-2); }

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.12);
}

.feature-card__icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ── Screenshots ──────────────────────────────────────────── */
.screenshots { background: var(--bg); }

.screenshots__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.screenshot-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.screenshot-item:hover {
  border-color: var(--accent);
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  z-index: 2;
}

.screenshot-item img {
  width: 100%;
  aspect-ratio: 9/19;
  object-fit: cover;
  display: block;
}

.screenshot-item figcaption {
  padding: 10px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  text-align: center;
  letter-spacing: 0.02em;
}

/* ── Tech Stack ───────────────────────────────────────────── */
.tech { background: var(--bg-2); }

.tech__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tech-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color 0.2s, transform 0.2s;
}

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

.tech-card__logo {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
}

.tech-card__logo svg {
  width: 100%;
  height: 100%;
}

.tech-card__logo--text {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--border-2);
  border-radius: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-2);
}

.tech-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tech-card p {
  font-size: 0.85rem;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 16px;
}

.tech-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.2);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ── About ────────────────────────────────────────────────── */
.about { background: var(--bg); }

.about__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 80px;
  align-items: center;
}

.about__content .section-label { display: inline-block; }
.about__content .section-title { text-align: left; }

.about__bio {
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 520px;
}

.about__bio strong { color: var(--text); font-weight: 600; }

.about__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.about__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  text-align: center;
  min-width: 220px;
  flex-shrink: 0;
}

.about__avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 16px;
  box-shadow: 0 0 24px var(--accent-glow);
}

.about__name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.about__role {
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 20px;
}

.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.about__tags span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-2);
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.2);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.footer__brand p {
  font-size: 0.875rem;
  color: var(--text-3);
  margin-top: 8px;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--text-2);
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--text); }

.footer__copy p {
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ── Lightbox ─────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}

.lightbox.is-open {
  opacity: 1;
  pointer-events: all;
}

.lightbox__img {
  max-height: 90vh;
  max-width: 400px;
  border-radius: var(--radius-lg);
  box-shadow: 0 40px 100px rgba(0,0,0,0.8);
}

.lightbox__close {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 2rem;
  color: var(--text-2);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}
.lightbox__close:hover { color: var(--text); }

/* ── Scroll reveal ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ── Responsive ───────────────────────────────────────────── */

/* Tablet */
@media (max-width: 1024px) {
  :root { --section-gap: 90px; }

  .hero__inner { grid-template-columns: 1fr; gap: 48px; text-align: center; }
  .hero__desc { margin-left: auto; margin-right: auto; }
  .hero__actions { justify-content: center; }
  .hero__stats { justify-content: center; }
  .hero__visual { order: -1; }
  .phone-mockup__frame { width: 220px; }

  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .screenshots__grid { grid-template-columns: repeat(3, 1fr); }
  .tech__grid { grid-template-columns: repeat(2, 1fr); }

  .about__inner { grid-template-columns: 1fr; gap: 48px; }
  .about__content .section-title { text-align: center; }
  .about__content .section-label { display: block; text-align: center; }
  .about__bio { margin-left: auto; margin-right: auto; text-align: center; }
  .about__links { justify-content: center; }
  .about__card { margin: 0 auto; }

  .compare { grid-template-columns: 1fr; gap: 16px; }
  .compare__vs { text-align: center; }

  .flow { gap: 8px; }
  .flow__arrow { display: none; }
}

/* Mobile */
@media (max-width: 768px) {
  :root { --section-gap: 72px; }

  .nav__links { display: none; }
  .nav__inner > .btn--outline { display: none; }
  .nav__hamburger { display: flex; }

  .hero { padding-top: calc(var(--nav-h) + 24px); padding-bottom: 60px; }
  .hero__title { font-size: 2rem; }
  .hero__desc { font-size: 1rem; }
  .phone-mockup__frame { width: 190px; }

  .features__grid { grid-template-columns: 1fr; }
  .screenshots__grid { grid-template-columns: repeat(2, 1fr); }
  .tech__grid { grid-template-columns: 1fr 1fr; }

  .flow { flex-direction: column; overflow-x: visible; }
  .flow__step { min-width: unset; }

  .section-title { font-size: 1.6rem; }
  .section-desc { font-size: 0.95rem; }
}

@media (max-width: 400px) {
  .screenshots__grid { grid-template-columns: 1fr 1fr; }
  .tech__grid { grid-template-columns: 1fr; }
  .hero__stats { flex-direction: column; gap: 12px; }
  .hero__stat-divider { width: 40px; height: 1px; }
}