/* 
  SPACING SYSTEM (px)
  2 / 4 / 8 / 12 / 16 / 24 / 32 / 48 / 64 / 80 / 96 / 128

  FONT SIZE SYSTEM (px)
  10 / 12 / 14 / 16 / 18 / 20 / 24 / 30 / 36 / 44 / 52 / 62 / 74 / 86 / 98
*/

/* ============================================================
   CUSTOM PROPERTIES
   ============================================================ */

:root {
  --white: hsl(0, 0%, 100%);
  --navy-950: hsl(216, 53%, 9%);
  --navy-900: hsl(218, 28%, 13%);
  --navy-850: hsl(217, 28%, 15%);
  --navy-800: hsl(219, 30%, 18%);
  --navy-50: hsl(222, 36%, 91%);
  --cyan-400: hsl(177, 67%, 63%);
  --cyan-300: hsl(186, 61%, 72%);
  --red: hsl(0, 100%, 63%);
  --gray: hsl(0, 0%, 75%);

  --gradient: linear-gradient(
    135deg,
    hsl(176, 68%, 64%) 0%,
    hsl(198, 60%, 50%) 100%
  );

  /* Spacing scale */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-7: 56px;
  --space-8: 64px;
  --space-9: 72px;
  --space-10: 80px;

  /* Typography */
  --font-body: "Open Sans", sans-serif;
  --font-heading: "Raleway", sans-serif;
  --fw-normal: 400;
  --fw-bold: 700;

  /* Layout */
  --max-width: 1200px;
  --section-padding-x: clamp(24px, 6vw, 80px);
}

/* ============================================================
   RESET
   ============================================================ */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

a {
  text-decoration: none;
  color: var(--white);
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* ============================================================
   BASE
   ============================================================ */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: var(--fw-normal);
  color: var(--white);
  background-color: var(--navy-850);
  line-height: 1.6;
}

/* ============================================================
   UTILITIES
   ============================================================ */

.btn {
  display: inline-block;
  border: none;
  outline: none;
  background: var(--gradient);
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 14px;
  padding: 16px 56px;
  border-radius: 50px;
  cursor: pointer;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* ============================================================
   NAVBAR
   ============================================================ */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--section-padding-x);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav .logo__img {
  width: 120px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__links a {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--white);
  transition: color 0.2s ease;
}

.nav__links a:hover {
  color: var(--cyan-400);
  text-decoration: underline;
}

/* ============================================================
   HERO SECTION
   ============================================================ */

.hero__section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-7);
  padding: var(--space-6) var(--section-padding-x) var(--space-10);
  text-align: center;

  background-color: var(--navy-850);
  background-image: url(../images/bg-curvy-desktop.svg);
  background-repeat: no-repeat;
  background-position: bottom center;
  background-size: contain;
}

.hero__img {
  width: 100%;
  max-width: 500px;
}

.hero__content {
  width: 100%;
  max-width: 680px;
}

.hero__content h1 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.3;
  margin-bottom: var(--space-3);
}

.hero__content p {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: var(--space-4);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   FEATURES SECTION
   ============================================================ */

.features__section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 80px;
  padding: var(--space-10) var(--section-padding-x);
  background-color: var(--navy-900);
  text-align: center;
}

.features__item {
  padding: var(--space-4) var(--space-5);
}

.features__item img {
  width: 56px;
  height: 56px;
  object-fit: contain;
  margin: 0 auto var(--space-2);
}

.features__item h3 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 18px;
  margin-bottom: var(--space-1);
}

.features__item p {
  font-size: 14px;
  color: var(--gray);
  max-width: 340px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================================
   PRODUCTIVE SECTION
   ============================================================ */

.productive__section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  background-color: var(--navy-900);
  padding: var(--space-10) var(--section-padding-x);
}

.productive__img {
  width: 100%;
  max-width: 520px;
  flex-shrink: 0;
}

.productive__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 520px;
}

.productive__content h2 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.3;
}

.productive__content p {
  font-size: 15px;
  line-height: 1.7;
}

.productive__link a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan-400);
  font-size: 15px;
  position: relative;
  transition: color 0.2s ease;
}

.productive__link a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background-color: var(--cyan-400);
  transition: opacity 0.2s ease;
}

.productive__link a:hover {
  color: var(--white);
}

.productive__link a:hover::after {
  opacity: 0;
}

/* ============================================================
   TESTIMONIALS SECTION
   ============================================================ */

.testimonials__section {
  background-color: var(--navy-900);
  padding: var(--space-10) var(--section-padding-x);
  position: relative;

  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 24px;
}

.testimonials__section::before {
  content: "";
  position: absolute;
  top: 44px;
  left: calc(var(--section-padding-x) - 8px);
  width: 55px;
  height: 45px;
  background-image: url("../images/bg-quotes.png");
  background-repeat: no-repeat;
  background-size: contain;
  z-index: 0;
}

.testimonial__card {
  background-color: var(--navy-800);
  padding: var(--space-4);
  border-radius: 8px;
  z-index: 1;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial__card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.testimonial__body {
  font-size: 13px;
  line-height: 1.8;
  margin-bottom: var(--space-3);
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.testimonial__author img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial__author h4 {
  font-size: 12px;
  font-weight: var(--fw-bold);
  margin-bottom: 2px;
}

.testimonial__author span {
  font-size: 10px;
  color: var(--gray);
  letter-spacing: 0.3px;
}

/* ============================================================
   CTA CARD
   ============================================================ */

.cta__section {
  background-color: var(--navy-900);
  padding-bottom: 0;
}

.cta__container {
  background-color: var(--navy-850);
  padding: var(--space-6) var(--space-10);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;

  /* Overlap into footer */
  position: relative;
  z-index: 10;
  transform: translateY(120px);
}

.cta__container h2 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 32px;
  margin-bottom: var(--space-2);
}

.cta__container p {
  font-size: 14px;
  color: var(--gray);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

.cta__form {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  margin-top: var(--space-4);
}

.input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.cta__form input[type="email"] {
  flex: 1;
  min-width: 0;
  padding: 14px 24px;
  border-radius: 50px;
  border: none;
  background-color: var(--white);
  color: var(--navy-900);
  font-size: 13px;
  font-family: var(--font-body);
  outline: 2px solid transparent;
  transition: outline-color 0.2s ease;
}

.cta__form input[type="email"]:focus {
  outline-color: var(--cyan-400);
}

.cta__form input[type="email"]::placeholder {
  color: var(--gray);
}

.cta__form .btn {
  white-space: nowrap;
  padding: 14px 32px;
  margin-bottom: 20px;
  font-size: 13px;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  background-color: var(--navy-950);
  padding: 200px var(--section-padding-x) var(--space-8);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__logo-img {
  width: 120px;
  margin-bottom: var(--space-4);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2.5fr 1.5fr 1fr 1fr auto;
  gap: 40px;
  align-items: start;
}

/* Col 1: Address */
.footer__col--address .footer__address {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.footer__col--address .footer__address img {
  width: 16px;
  flex-shrink: 0;
  margin-top: 3px;
}

.footer__col--address .footer__address p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 340px;
}

/* Col 2: Contact */
.footer__col--contact {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer__contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

.footer__contact-item img {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Col 3 & 4: Nav links */
.footer__col--links {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer__col--links a {
  font-size: 14px;
  color: var(--white);
  transition: color 0.2s ease;
}

.footer__col--links a:hover {
  color: var(--cyan-400);
}

/* Col 5: Social icons */
.footer__col--social {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
}

.footer__social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--white);
  border-radius: 50%;
  font-size: 16px;
  color: var(--white);
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}

.footer__social-icon:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

.error {
  visibility: hidden;
  min-height: 14px;
  opacity: 0;
  color: var(--red);
  font-size: 10px;
  font-weight: var(--fw-bold);
  text-align: left;
  width: 100%;
  margin-top: 6px;
  transition: opacity 0.2s ease;
}

/* ============================================================
   RESPONSIVENESS
   ============================================================ */
@media (max-width: 786px) {
  .nav .logo__img {
    width: 80px;
  }

  .nav__links {
    gap: 12px;
  }

  .nav__links a {
    font-size: 12px;
  }

  .hero__section {
    background-image: url(../images/bg-curvy-mobile.svg);
    padding-bottom: 80px;
    background-position: bottom;
    background-size: contain;
  }

  .hero__content p {
    font-size: 16px;
  }

  .cta__section {
    padding: 0 12px;
  }

  .cta__container {
    transform: translateY(150px);
    padding: 32px 24px;
  }

  .cta__form {
    flex-direction: column;
    align-items: stretch;
  }

  .cta__form .btn {
    width: 100%;
  }

  .footer__col--social {
    justify-content: center;
  }
}

@media (max-width: 1024px) {
  .productive__section {
    flex-direction: column;
    text-align: center;
  }

  .productive__content {
    align-items: center;
  }

  .features__section {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .testimonials__section {
    flex-direction: column;
    align-items: center;
  }

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