/* ==============================
   SURFMORY LANDING PAGE — STYLES
   ============================== */

/* === CSS CUSTOM PROPERTIES === */
:root {
  /* Colors */
  --color-primary: #0066ff;
  --color-primary-dark: #0052cc;
  --color-primary-light: #e6f0ff;
  --color-accent: #ff6b35;
  --color-accent-dark: #e55a2b;
  --color-eco: #10b981;
  --color-eco-dark: #059669;
  --color-eco-light: #d1fae5;
  --color-dark: #0f172a;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-light: #f8fafc;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-error: #ef4444;
  --color-success: #22c55e;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-padding: 1.25rem;
  --header-height: 72px;

  /* Effects */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === RESET & BASE === */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

/* === CONTAINER === */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4 {
  color: var(--color-dark);
  line-height: 1.2;
  font-weight: 700;
}

.section-title {
  font-size: var(--font-size-3xl);
  text-align: center;
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 107, 53, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.4);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-sm);
}

.btn--lg {
  padding: 0.875rem 2rem;
  font-size: var(--font-size-lg);
}

.btn--full {
  width: 100%;
}

/* === REVEAL ANIMATION === */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* === HEADER === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all var(--transition);
  background: transparent;
}

.header--scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.header--scrolled .header__logo,
.header--scrolled .lang-toggle,
.header--scrolled .lang-toggle__option {
  color: var(--color-dark);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-white);
  transition: color var(--transition);
}

.header__logo-icon {
  color: inherit;
}

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

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  padding: 3px;
  transition: background var(--transition);
}

.header--scrolled .lang-toggle {
  background: var(--color-light);
}

.lang-toggle__option {
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition);
  cursor: pointer;
}

.header--scrolled .lang-toggle__option {
  color: var(--color-text-light);
}

.lang-toggle__option--active {
  background: var(--color-white);
  color: var(--color-dark) !important;
  box-shadow: var(--shadow-sm);
}

.header--scrolled .lang-toggle__option--active {
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

/* === HERO === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

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

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.5) 100%);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #6ee7b7;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--space-xl);
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero__title--accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(255, 255, 255, 0.5);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* === PROBLEM → SOLUTION === */
.problem-solution {
  padding: var(--space-5xl) 0;
  background: var(--color-light);
}

.problem-solution__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.problem-solution__side {
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.problem-solution__label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.problem-solution__label--green {
  color: var(--color-eco);
  background: var(--color-eco-light);
}

.problem-solution__side h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-lg);
}

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

.problem-solution__list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  font-size: var(--font-size-base);
  line-height: 1.5;
}

.problem-solution__list li svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* === FEATURES === */
.features {
  padding: var(--space-5xl) 0;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.features__card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  border-radius: var(--radius-lg);
  background: var(--color-light);
  transition: all var(--transition);
  border: 1px solid transparent;
}

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

.features__icon {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
}

.features__card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

.features__card p {
  color: var(--color-text-light);
  line-height: 1.7;
}

/* === DEMO === */
.demo {
  padding: var(--space-5xl) 0;
  background: var(--color-light);
}

.demo__video {
  margin-bottom: var(--space-3xl);
}

.demo__video-player {
  width: 100%;
  border-radius: var(--radius-lg);
  background: var(--color-dark);
}

.demo__gif {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.demo__gif-image {
  max-width: 500px;
  width: 100%;
  border-radius: var(--radius-lg);
  margin: 0 auto;
  image-rendering: auto;
  -webkit-filter: blur(0.3px);
  filter: blur(0.3px);
}

.demo__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.demo__step {
  text-align: center;
  padding: var(--space-xl);
}

.demo__step-number {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 800;
  font-size: var(--font-size-xl);
  border-radius: 50%;
  margin: 0 auto var(--space-lg);
}

.demo__step h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.demo__step p {
  color: var(--color-text-light);
}

/* === ECO === */
.eco {
  padding: var(--space-5xl) 0;
  background: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
  color: var(--color-white);
}

.eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.eco__label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #6ee7b7;
  background: rgba(110, 231, 183, 0.15);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.eco__content h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--space-lg);
}

.eco__content p {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-lg);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
}

.eco__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.eco__stat {
  text-align: center;
}

.eco__stat-number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: #6ee7b7;
  margin-bottom: var(--space-xs);
}

.eco__stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.eco__image {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  max-height: 450px;
}

/* === TESTIMONIALS === */
.testimonials {
  padding: var(--space-5xl) 0;
}

.testimonials__carousel {
  position: relative;
  overflow: hidden;
}

.testimonials__track {
  display: flex;
  gap: var(--space-xl);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.testimonials__card {
  flex: 0 0 100%;
  padding: var(--space-2xl);
  background: var(--color-light);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.testimonials__stars {
  color: #fbbf24;
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
  letter-spacing: 2px;
}

.testimonials__text {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  font-style: italic;
}

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

.testimonials__author strong {
  color: var(--color-dark);
}

.testimonials__author span {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.testimonials__nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.testimonials__btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition);
}

.testimonials__btn:hover {
  background: var(--color-dark);
  color: var(--color-white);
  border-color: var(--color-dark);
}

/* === PRODUCT === */
.product {
  padding: var(--space-5xl) 0;
  background: var(--color-light);
}

.product__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.product__main-image {
  margin-bottom: var(--space-md);
}

.product__img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 1;
  background: var(--color-white);
  transition: opacity 0.3s ease;
}

.product__thumbnails {
  display: flex;
  gap: var(--space-sm);
}

.product__thumb {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition);
  overflow: hidden;
}

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

.product__thumb--active,
.product__thumb:hover {
  border-color: var(--color-primary);
}

.product__tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.product__info h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.product__desc {
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.product__price {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.product__price-old {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  text-decoration: line-through;
}

.product__price-current {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  color: var(--color-dark);
}

.product__price-save {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-eco);
  background: var(--color-eco-light);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.product__trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.product__trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.product__fallback-cta {
  margin-bottom: var(--space-md);
}

/* === FAQ === */
.faq {
  padding: var(--space-5xl) 0;
}

.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-lg) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-dark);
  text-align: left;
  transition: color var(--transition);
}

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

.faq__chevron {
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq__item--open .faq__chevron {
  transform: rotate(180deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq__item--open .faq__answer {
  max-height: 300px;
  padding-bottom: var(--space-lg);
}

.faq__answer p {
  color: var(--color-text-light);
  line-height: 1.7;
}

/* === FINAL CTA === */
.final-cta {
  padding: var(--space-5xl) 0;
  background: linear-gradient(135deg, var(--color-dark) 0%, #1e293b 100%);
}

.final-cta__inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.final-cta__inner h2 {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.final-cta__inner p {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2xl);
}

/* === FOOTER === */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--space-md);
}

.footer__brand p {
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.footer__links h4 {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer__links li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  font-size: var(--font-size-sm);
  transition: color var(--transition);
}

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

.footer__bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition);
}

.footer__social a:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}

.footer__bottom p {
  font-size: var(--font-size-sm);
}

/* ==============================
   RESPONSIVE BREAKPOINTS
   ============================== */

/* Tablet: 768px+ */
@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
  }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-xl);
  }

  .problem-solution__grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .demo__steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .eco__grid {
    grid-template-columns: 1.2fr 0.8fr;
  }

  .testimonials__card {
    flex: 0 0 calc(50% - var(--space-xl) / 2);
  }

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

  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  .section-title {
    font-size: var(--font-size-4xl);
  }

  .hero__title {
    font-size: clamp(3rem, 5vw, 4.5rem);
  }

  .testimonials__card {
    flex: 0 0 calc(33.333% - var(--space-xl) * 2 / 3);
  }

  .product__grid {
    gap: var(--space-4xl);
  }
}

/* Large Desktop: 1280px+ */
@media (min-width: 1280px) {
  :root {
    --container-max: 1280px;
  }
}