/* ============================================
   Tulsi Energy Solution — Premium Theme
   Mobile-first | Responsive | Modern
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

/* ---------- Design Tokens ---------- */
:root {
    --primary: #12263F;
    --primary-light: #1a3556;
    --secondary: #F2A900;
    --secondary-light: #FFD166;
    --accent: #0B7F86;
    --accent-light: #0fa3ac;
    --text-dark: #1a1a2e;
    --text-body: #4a4a68;
    --text-light: #7a7a96;
    --text-muted: #a0a0b8;
    --bg-body: #f7f8fc;
    --bg-white: #ffffff;
    --bg-light: #f0f2f8;
    --bg-dark: #0d1b2a;
    --shadow-sm: 0 2px 8px rgba(18,38,63,0.06);
    --shadow-md: 0 8px 24px rgba(18,38,63,0.08);
    --shadow-lg: 0 16px 48px rgba(18,38,63,0.12);
    --shadow-xl: 0 24px 64px rgba(18,38,63,0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 50px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --container: 1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-body);
    color: var(--text-body);
    background: var(--bg-body);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 { font-family: var(--font-heading); color: var(--primary); font-weight: 700; line-height: 1.25; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }

/* ---------- Container ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 32px; border-radius: var(--radius-full); font-weight: 600; font-size: 1rem;
    border: none; cursor: pointer; transition: var(--transition); text-decoration: none;
    position: relative; overflow: hidden;
}
.btn::after {
    content: ''; position: absolute; top: 50%; left: 50%;
    width: 0; height: 0; border-radius: 50%;
    background: rgba(255,255,255,0.2);
    transition: width 0.4s, height 0.4s, top 0.4s, left 0.4s;
}
.btn:active::after { width: 200%; height: 200%; top: -50%; left: -50%; }
.btn-primary {
    background: linear-gradient(135deg, var(--secondary), #e09b00);
    color: var(--primary); font-weight: 700;
    box-shadow: 0 4px 20px rgba(242,169,0,0.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(242,169,0,0.45); }
.btn-outline {
    background: transparent; border: 2px solid var(--primary); color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--bg-white); transform: translateY(-2px); }
.btn-white {
    background: var(--bg-white); color: var(--primary); font-weight: 700;
    box-shadow: var(--shadow-md);
}
.btn-white:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.btn-sm { padding: 10px 22px; font-size: 0.9rem; }
.btn-lg { padding: 18px 40px; font-size: 1.1rem; }

/* ============================================
   HEADER / NAVBAR
   ============================================ */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(18,38,63,0.06);
    transition: var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    max-width: var(--container); margin: 0 auto; padding: 14px 20px;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--font-heading); font-weight: 800; font-size: 1.35rem;
    color: var(--primary); text-decoration: none;
}
.logo-icon {
    width: 40px; height: 40px; border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--secondary), #e09b00);
    display: flex; align-items: center; justify-content: center; color: var(--primary);
}
.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
    font-weight: 500; color: var(--text-body); transition: var(--transition);
    position: relative; font-size: 0.95rem;
}
.nav a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--secondary);
    transition: width 0.3s;
}
.nav a:hover { color: var(--primary); }
.nav a:hover::after { width: 100%; }
.nav-btns { display: flex; align-items: center; gap: 12px; }

/* Mobile hamburger */
.hamburger {
    display: none; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 4px; z-index: 1001;
}
.hamburger span {
    width: 26px; height: 2.5px; background: var(--primary); border-radius: 3px;
    transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* Mobile menu */
.mobile-menu {
    display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(20px);
    z-index: 999; flex-direction: column; align-items: center; justify-content: center; gap: 24px;
    opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.mobile-menu.active { opacity: 1; pointer-events: auto; }
.mobile-menu a {
    font-family: var(--font-heading); font-size: 1.5rem; font-weight: 600;
    color: var(--primary); transition: var(--transition);
}
.mobile-menu a:hover { color: var(--accent); }

/* ============================================
   PROMO BANNER
   ============================================ */
.promo-banner {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--bg-white); text-align: center; padding: 12px 20px;
    font-size: 0.9rem; font-weight: 500;
    position: relative; z-index: 999;
}
.promo-banner a { color: var(--secondary-light); font-weight: 700; text-decoration: underline; }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    overflow: hidden; padding: 120px 20px 80px;
}
.hero-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover; z-index: -2;
}
.hero-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(18,38,63,0.92) 0%, rgba(18,38,63,0.7) 50%, rgba(11,127,134,0.5) 100%);
    z-index: -1;
}
.hero-content {
    max-width: 700px; z-index: 1; animation: heroFadeIn 1s ease-out;
}
.hero h1 {
    color: #fff; font-size: clamp(2.2rem, 6vw, 3.8rem); margin-bottom: 20px;
    font-weight: 800; line-height: 1.15;
}
.hero h1 span { color: var(--secondary); }
.hero-subtitle {
    color: rgba(255,255,255,0.85); font-size: clamp(1rem, 2.5vw, 1.25rem);
    margin-bottom: 12px; line-height: 1.7;
}
.hero-tagline {
    color: var(--secondary); font-weight: 600; font-size: 1.05rem;
    margin-bottom: 36px; display: flex; align-items: center; gap: 8px;
}
.hero-btns { display: flex; flex-wrap: wrap; gap: 16px; }

/* Floating stats */
.hero-stats {
    display: flex; flex-wrap: wrap; gap: 20px; margin-top: 50px;
}
.stat-card {
    background: rgba(255,255,255,0.1); backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-md); padding: 16px 24px;
    color: #fff; min-width: 120px;
}
.stat-card .num {
    font-family: var(--font-heading); font-size: 1.8rem; font-weight: 800;
    color: var(--secondary);
}
.stat-card .label { font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-top: 2px; }

/* ============================================
   SECTIONS — COMMON
   ============================================ */
.section { padding: 80px 20px; }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 50px; }
.section-label {
    display: inline-block; background: rgba(11,127,134,0.1); color: var(--accent);
    font-weight: 600; font-size: 0.85rem; padding: 6px 16px; border-radius: var(--radius-full);
    margin-bottom: 14px; letter-spacing: 0.5px; text-transform: uppercase;
}
.section-title {
    margin-bottom: 16px; position: relative;
}
.section-desc { color: var(--text-light); font-size: 1.05rem; line-height: 1.8; }

/* ============================================
   SOLAR SYSTEMS CARDS
   ============================================ */
.systems-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px; max-width: var(--container); margin: 0 auto;
}
.system-card {
    background: var(--bg-white); border-radius: var(--radius-lg); padding: 36px 28px;
    border: 1px solid rgba(18,38,63,0.06);
    box-shadow: var(--shadow-sm); transition: var(--transition);
    position: relative; overflow: hidden;
}
.system-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--secondary));
    transform: scaleX(0); transition: transform 0.4s; transform-origin: left;
}
.system-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.system-card:hover::before { transform: scaleX(1); }
.system-icon {
    width: 56px; height: 56px; border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(11,127,134,0.1), rgba(242,169,0,0.1));
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; font-size: 1.5rem;
}
.system-card h3 { margin-bottom: 12px; }
.system-card p { color: var(--text-light); line-height: 1.7; font-size: 0.95rem; }

/* ============================================
   HOW IT WORKS — STEPS
   ============================================ */
.steps-section { background: var(--bg-white); }
.steps-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px; max-width: var(--container); margin: 0 auto;
    position: relative;
}
.step {
    text-align: center; padding: 32px 20px;
    position: relative;
}
.step-number {
    width: 60px; height: 60px; border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary), #e09b00);
    color: var(--primary); font-family: var(--font-heading); font-weight: 800;
    font-size: 1.4rem; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 20px; box-shadow: 0 6px 20px rgba(242,169,0,0.3);
}
.step h3 { margin-bottom: 10px; font-size: 1.15rem; }
.step p { color: var(--text-light); font-size: 0.9rem; }

/* ============================================
   PROJECTS GALLERY
   ============================================ */
.gallery-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px; max-width: var(--container); margin: 0 auto;
}
.gallery-item {
    position: relative; border-radius: var(--radius-lg); overflow: hidden;
    aspect-ratio: 16/10; cursor: pointer;
}
.gallery-item img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.5s;
}
.gallery-item:hover img { transform: scale(1.08); }
.gallery-caption {
    position: absolute; bottom: 0; left: 0; right: 0;
    padding: 20px; background: linear-gradient(transparent, rgba(18,38,63,0.85));
    color: #fff; transform: translateY(100%); transition: transform 0.4s;
}
.gallery-item:hover .gallery-caption { transform: translateY(0); }
.gallery-caption h4 { font-size: 1rem; color: #fff; margin-bottom: 4px; }
.gallery-caption p { font-size: 0.85rem; color: rgba(255,255,255,0.7); }

/* ============================================
   SAVINGS CALCULATOR
   ============================================ */
.calc-section { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%); color: #fff; }
.calc-section .section-label { background: rgba(255,255,255,0.15); color: var(--secondary); }
.calc-section .section-title { color: #fff; }
.calc-section .section-desc { color: rgba(255,255,255,0.7); }
.calc-card {
    background: rgba(255,255,255,0.08); backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-xl); padding: 40px;
    max-width: 700px; margin: 0 auto;
}
.calc-input-group { margin-bottom: 28px; }
.calc-input-group label {
    display: block; color: rgba(255,255,255,0.8); font-weight: 500;
    margin-bottom: 8px; font-size: 0.95rem;
}
.calc-input {
    width: 100%; padding: 16px 20px; border-radius: var(--radius-md);
    border: 2px solid rgba(255,255,255,0.15); background: rgba(255,255,255,0.05);
    color: #fff; font-size: 1.1rem; font-weight: 600; transition: var(--transition);
    outline: none;
}
.calc-input:focus { border-color: var(--secondary); background: rgba(255,255,255,0.1); }
.calc-input::placeholder { color: rgba(255,255,255,0.3); }
.calc-results {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px; margin-top: 24px;
}
.calc-result-card {
    background: rgba(255,255,255,0.1); border-radius: var(--radius-md);
    padding: 20px; text-align: center;
}
.calc-result-card .value {
    font-family: var(--font-heading); font-size: 1.6rem; font-weight: 800;
    color: var(--secondary); margin-bottom: 4px;
}
.calc-result-card .label { font-size: 0.85rem; color: rgba(255,255,255,0.6); }

/* ============================================
   CUSTOMER REVIEWS
   ============================================ */
.reviews-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px; max-width: var(--container); margin: 0 auto;
}
.review-card {
    background: var(--bg-white); border-radius: var(--radius-lg); padding: 32px;
    box-shadow: var(--shadow-sm); border: 1px solid rgba(18,38,63,0.06);
    transition: var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.review-stars { color: var(--secondary); font-size: 1.1rem; margin-bottom: 16px; letter-spacing: 2px; }
.review-text { color: var(--text-body); line-height: 1.8; font-size: 0.95rem; margin-bottom: 20px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 14px; }
.review-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 1.1rem;
}
.review-info .name { font-weight: 600; color: var(--primary); font-size: 0.95rem; }
.review-info .location { font-size: 0.85rem; color: var(--text-muted); }

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-section { background: var(--bg-white); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    border: 1px solid rgba(18,38,63,0.08); border-radius: var(--radius-md);
    margin-bottom: 12px; overflow: hidden; transition: var(--transition);
}
.faq-item:hover { border-color: rgba(11,127,134,0.2); }
.faq-question {
    width: 100%; display: flex; align-items: center; justify-content: space-between;
    padding: 20px 24px; background: none; border: none; cursor: pointer;
    font-weight: 600; color: var(--primary); font-size: 1rem;
    text-align: left; transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-icon {
    width: 28px; height: 28px; border-radius: 50%;
    background: rgba(11,127,134,0.1); display: flex; align-items: center; justify-content: center;
    transition: transform 0.3s; flex-shrink: 0; font-size: 1.2rem; color: var(--accent);
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s;
    padding: 0 24px; color: var(--text-light); line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ============================================
   REGISTRATION / GET A QUOTE (CTA)
   ============================================ */
.cta-section {
    background: linear-gradient(135deg, var(--accent) 0%, #0a6b72 100%);
    color: #fff; text-align: center;
}
.cta-section h2 { color: #fff; }
.cta-section p { color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 30px; font-size: 1.1rem; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-dark); color: rgba(255,255,255,0.7);
    padding: 70px 20px 20px;
}
.footer-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 40px; max-width: var(--container); margin: 0 auto 40px;
}
.footer h4 {
    color: var(--secondary); font-family: var(--font-heading); font-size: 1.15rem;
    margin-bottom: 20px;
}
.footer-about p { line-height: 1.8; font-size: 0.9rem; }
.footer-links a {
    display: block; padding: 6px 0; color: rgba(255,255,255,0.6);
    transition: var(--transition); font-size: 0.9rem;
}
.footer-links a:hover { color: var(--secondary); transform: translateX(4px); }
.footer-contact p {
    display: flex; align-items: flex-start; gap: 10px;
    margin-bottom: 12px; font-size: 0.9rem;
}
.footer-social { display: flex; gap: 12px; margin-top: 16px; }
.footer-social a {
    width: 40px; height: 40px; border-radius: 50%;
    background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.6); transition: var(--transition); font-size: 1rem;
}
.footer-social a:hover { background: var(--secondary); color: var(--primary); transform: translateY(-3px); }
.footer-bottom {
    max-width: var(--container); margin: 0 auto;
    padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08);
    display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
    gap: 12px; font-size: 0.85rem;
}
.footer-legal a { color: rgba(255,255,255,0.5); margin-left: 20px; transition: var(--transition); }
.footer-legal a:hover { color: var(--secondary); }

/* ============================================
   WHATSAPP FLOATING BUTTON
   ============================================ */
.whatsapp-float {
    position: fixed; bottom: 24px; right: 24px; z-index: 900;
    width: 60px; height: 60px; border-radius: 50%;
    background: #25D366; color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; box-shadow: 0 6px 24px rgba(37,211,102,0.4);
    transition: var(--transition); text-decoration: none;
    animation: bounce 2s infinite;
}
.whatsapp-float:hover { transform: scale(1.1); box-shadow: 0 8px 32px rgba(37,211,102,0.5); }

/* ============================================
   PWA INSTALL BANNER
   ============================================ */
.install-banner {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--primary); color: #fff; padding: 16px 20px;
    z-index: 950; box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
    animation: slideUp 0.5s ease-out;
}
.install-banner.show { display: block; }
.install-inner {
    max-width: var(--container); margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.install-text { font-size: 0.95rem; }
.install-text strong { color: var(--secondary); }
.install-btns { display: flex; gap: 10px; }
.install-dismiss {
    background: none; border: none; color: rgba(255,255,255,0.6);
    cursor: pointer; font-size: 0.9rem; padding: 8px 12px;
}

/* ============================================
   LOGIN PAGE
   ============================================ */
.auth-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--accent) 100%);
    padding: 20px;
}
.auth-card {
    background: var(--bg-white); border-radius: var(--radius-xl); padding: 48px 40px;
    width: 100%; max-width: 440px; box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease-out;
}
.auth-card .logo { justify-content: center; margin-bottom: 32px; font-size: 1.5rem; }
.auth-card h2 { text-align: center; margin-bottom: 8px; }
.auth-card .subtitle { text-align: center; color: var(--text-light); margin-bottom: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block; font-weight: 500; color: var(--text-dark);
    margin-bottom: 6px; font-size: 0.9rem;
}
.form-input {
    width: 100%; padding: 14px 16px; border: 2px solid rgba(18,38,63,0.1);
    border-radius: var(--radius-md); font-size: 1rem; transition: var(--transition);
    outline: none; background: var(--bg-light);
}
.form-input:focus { border-color: var(--accent); background: var(--bg-white); box-shadow: 0 0 0 4px rgba(11,127,134,0.1); }
.form-input::placeholder { color: var(--text-muted); }
.password-wrapper { position: relative; }
.password-toggle {
    position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
    background: none; border: none; color: var(--text-muted); cursor: pointer;
    font-size: 0.9rem; padding: 4px;
}
.form-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.form-row a { color: var(--accent); font-size: 0.9rem; font-weight: 500; }
.form-row a:hover { text-decoration: underline; }
.auth-link { text-align: center; margin-top: 24px; color: var(--text-light); font-size: 0.9rem; }
.auth-link a { color: var(--accent); font-weight: 600; }

/* ============================================
   FORM ELEMENTS (Registration)
   ============================================ */
.reg-form {
    background: var(--bg-white); border-radius: var(--radius-xl); padding: 48px 40px;
    max-width: 700px; margin: 0 auto; box-shadow: var(--shadow-lg);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group.full { grid-column: 1 / -1; }
.form-select {
    width: 100%; padding: 14px 16px; border: 2px solid rgba(18,38,63,0.1);
    border-radius: var(--radius-md); font-size: 1rem; background: var(--bg-light);
    outline: none; transition: var(--transition); appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234a4a68' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 16px center;
}
.form-select:focus { border-color: var(--accent); }
.form-checkbox {
    display: flex; align-items: flex-start; gap: 10px; font-size: 0.9rem; color: var(--text-light);
}
.form-checkbox input[type="checkbox"] { margin-top: 4px; accent-color: var(--accent); width: 18px; height: 18px; }
.form-error {
    color: #dc3545; font-size: 0.8rem; margin-top: 4px; display: none;
}
.form-group.error .form-input, .form-group.error .form-select { border-color: #dc3545; }
.form-group.error .form-error { display: block; }
.file-upload {
    border: 2px dashed rgba(18,38,63,0.15); border-radius: var(--radius-md);
    padding: 24px; text-align: center; cursor: pointer; transition: var(--transition);
    background: var(--bg-light);
}
.file-upload:hover { border-color: var(--accent); background: rgba(11,127,134,0.03); }
.file-upload input[type="file"] { display: none; }
.file-upload .upload-icon { font-size: 2rem; margin-bottom: 8px; color: var(--accent); }
.file-upload .upload-text { font-size: 0.9rem; color: var(--text-light); }
.file-upload .upload-hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
.file-preview {
    display: none; margin-top: 8px; border-radius: var(--radius-sm);
    overflow: hidden; max-height: 120px;
}
.file-preview img { max-height: 120px; border-radius: var(--radius-sm); }

/* ============================================
   SUCCESS / THANK YOU
   ============================================ */
.success-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    text-align: center; padding: 20px;
}
.success-card {
    background: var(--bg-white); border-radius: var(--radius-xl); padding: 60px 40px;
    max-width: 500px; box-shadow: var(--shadow-xl);
}
.success-icon {
    width: 80px; height: 80px; border-radius: 50%;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff; font-size: 2.5rem; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 24px;
}

/* ============================================
   PRIVACY / TERMS PAGES
   ============================================ */
.legal-page { padding: 120px 20px 80px; }
.legal-content {
    max-width: 800px; margin: 0 auto; background: var(--bg-white);
    border-radius: var(--radius-xl); padding: 48px; box-shadow: var(--shadow-md);
}
.legal-content h1 { margin-bottom: 24px; }
.legal-content h3 { margin: 24px 0 12px; }
.legal-content p { margin-bottom: 16px; line-height: 1.8; }
.legal-content ul { margin: 0 0 16px 20px; }
.legal-content ul li { list-style: disc; margin-bottom: 6px; line-height: 1.7; }

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes heroFadeIn { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-8px); }
    60% { transform: translateY(-4px); }
}

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   RESPONSIVE — TABLET
   ============================================ */
@media (max-width: 992px) {
    .hero-stats { gap: 12px; }
    .stat-card { min-width: 100px; padding: 12px 18px; }
    .stat-card .num { font-size: 1.4rem; }
    .calc-card { padding: 28px 24px; }
    .reg-form { padding: 36px 28px; }
    .form-grid { grid-template-columns: 1fr; }
}

/* ============================================
   RESPONSIVE — MOBILE
   ============================================ */
@media (max-width: 768px) {
    .nav { display: none; }
    .nav-btns { display: none; }
    .hamburger { display: flex; }
    .mobile-menu { display: flex; }

    .hero { padding: 100px 20px 60px; min-height: auto; }
    .hero h1 { font-size: 2rem; }
    .hero-stats { flex-direction: column; gap: 10px; }
    .stat-card { display: flex; align-items: center; gap: 12px; padding: 12px 16px; }
    .stat-card .num { font-size: 1.3rem; }

    .section { padding: 60px 16px; }
    .section-header { margin-bottom: 36px; }

    .systems-grid { grid-template-columns: 1fr; gap: 16px; }
    .system-card { padding: 28px 22px; }

    .steps-grid { grid-template-columns: 1fr 1fr; gap: 16px; }

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

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

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }

    .auth-card { padding: 36px 24px; }
    .reg-form { padding: 28px 20px; }

    .whatsapp-float { width: 52px; height: 52px; font-size: 1.5rem; bottom: 20px; right: 16px; }
}

@media (max-width: 480px) {
    .steps-grid { grid-template-columns: 1fr; }
    .hero-btns { flex-direction: column; }
    .hero-btns .btn { width: 100%; text-align: center; }
    .calc-results { grid-template-columns: 1fr; }
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }