:root {
    --bg-app: #f1f5f9;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #1e293b;
    --primary-hover: #0f172a;
    --blue-accent: #3b82f6;
    --cropper-bg: #e0f2fe;
}

body.dark-mode {
    --bg-app: #0f172a;
    --card-bg: #1e293b;
    --border-color: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #f1f5f9;
    --primary-hover: #ffffff;
    --blue-accent: #60a5fa;
    --cropper-bg: #0f172a;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-app);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s, color 0.3s;
}

/* Utilities */
.hidden { display: none !important; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3.5rem; }
.mb-1 { margin-bottom: 1rem; }
.text-sm { font-size: 0.85rem; }
.text-md { font-size: 1rem; }
.text-lg { font-size: 1.15rem; }
.text-xl { font-size: 1.5rem; }
.text-muted { color: var(--text-muted); }
.text-blue { color: var(--blue-accent); }
.text-center { text-align: center; }
.fw-bold { font-weight: 700; }
.relative { position: relative; }
.align-center { display: flex; align-items: center; }

/* Navigation & Footer */
.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

@media (min-width: 1240px) {
    .site-nav {
        padding: 1rem calc((100vw - 1200px) / 2 + 2rem);
    }
}
body.dark-mode .site-nav {
    background: rgba(30, 41, 59, 0.85);
}
.site-nav .logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
}
.site-nav .nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}
@media (min-width: 769px) {
    .site-nav .nav-links > *:not(:first-child) {
        position: relative;
    }
    .site-nav .nav-links > *:not(:first-child)::before {
        content: '';
        position: absolute;
        left: -0.75rem;
        top: 50%;
        transform: translateY(-50%);
        height: 1.25rem;
        width: 1px;
        background-color: var(--border-color);
    }
}
.site-nav a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}
.site-nav a:hover {
    color: var(--blue-accent);
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
  flex: 0 0 auto !important;
}

.switch #theme-toggle {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #2196f3;
  -webkit-transition: 0.4s;
  transition: 0.4s;
  z-index: 0;
  overflow: hidden;
}

.sun-moon {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: yellow;
  -webkit-transition: 0.4s;
  transition: 0.4s;
}

#theme-toggle:checked + .slider {
  background-color: black;
}

#theme-toggle:focus + .slider {
  box-shadow: 0 0 1px #2196f3;
}

#theme-toggle:checked + .slider .sun-moon {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
  background-color: white;
}

.moon-dot {
  opacity: 0;
  transition: 0.4s;
  background-color: gray;
}

#theme-toggle:checked + .slider .sun-moon .moon-dot {
  opacity: 1;
}

.slider.round {
  border-radius: 34px;
}

.slider.round .sun-moon {
  border-radius: 50%;
}

#moon-dot-1 {
  left: 10px;
  top: 3px;
  position: absolute;
  width: 6px;
  height: 6px;
  z-index: 4;
  border-radius: 50%;
}

#moon-dot-2 {
  left: 2px;
  top: 10px;
  position: absolute;
  width: 10px;
  height: 10px;
  z-index: 4;
  border-radius: 50%;
}

#moon-dot-3 {
  left: 16px;
  top: 18px;
  position: absolute;
  width: 3px;
  height: 3px;
  z-index: 4;
  border-radius: 50%;
}

#light-ray-1 {
  left: -8px;
  top: -8px;
  position: absolute;
  width: 42px;
  height: 42px;
  z-index: -1;
  background-color: white;
  opacity: 10%;
  border-radius: 50%;
}

#light-ray-2 {
  left: -11px;
  top: -11px;
  position: absolute;
  width: 48px;
  height: 48px;
  z-index: -1;
  background-color: white;
  opacity: 10%;
  border-radius: 50%;
}

#light-ray-3 {
  left: -14px;
  top: -14px;
  position: absolute;
  width: 54px;
  height: 54px;
  z-index: -1;
  background-color: white;
  opacity: 10%;
  border-radius: 50%;
}

.cloud-light, .cloud-dark {
  position: absolute;
  border-radius: 50px;
  transition: opacity 0.4s;
}
.cloud-light {
  background-color: #eee;
}
.cloud-dark {
  background-color: #ccc;
}

#theme-toggle:checked + .slider .cloud-light,
#theme-toggle:checked + .slider .cloud-dark {
  opacity: 0;
}

#cloud-1 { left: 29px; top: 27px; width: 18px; height: 18px; }
#cloud-2 { left: 41px; top: 19px; width: 26px; height: 26px; }
#cloud-3 { left: 58px; top: 23px; width: 16px; height: 16px; }
#cloud-4 { left: 26px; top: 24px; width: 20px; height: 20px; }
#cloud-5 { left: 38px; top: 16px; width: 30px; height: 30px; }
#cloud-6 { left: 55px; top: 20px; width: 20px; height: 20px; }

.stars {
  transform: translateY(-32px);
  opacity: 0;
  transition: 0.4s;
}

.star {
  background-color: white;
  position: absolute;
  -webkit-transition: 0.4s;
  transition: 0.4s;
  border-radius: 50%;
  animation-name: star-twinkle;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}

#theme-toggle:checked + .slider .stars {
  -webkit-transform: translateY(0);
  -ms-transform: translateY(0);
  transform: translateY(0);
  opacity: 1;
}

#star-1 { width: 4px; height: 4px; top: 2px; left: 6px; animation-delay: 0.3s; }
#star-2 { width: 3px; height: 3px; top: 16px; left: 6px; }
#star-3 { width: 4px; height: 4px; top: 20px; left: 14px; animation-delay: 0.6s; }
#star-4 { width: 5px; height: 5px; top: 4px; left: 20px; animation-delay: 1.3s; }

@keyframes star-twinkle {
  0% { transform: scale(1); }
  40% { transform: scale(1.2); }
  80% { transform: scale(0.8); }
  100% { transform: scale(1); }
}

/* Mobile Hamburger Menu */
.hamburger {
  cursor: pointer;
  display: none;
}
.hamburger input {
  display: none;
}
.hamburger svg {
  height: 2.5em; /* slightly scaled down for nav bar */
  transition: transform 600ms cubic-bezier(0.4, 0, 0.2, 1);
}
.line {
  fill: none;
  stroke: var(--primary);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
  transition: stroke-dasharray 600ms cubic-bezier(0.4, 0, 0.2, 1),
              stroke-dashoffset 600ms cubic-bezier(0.4, 0, 0.2, 1);
}
.line-top-bottom {
  stroke-dasharray: 12 63;
}
.hamburger input:checked + svg {
  transform: rotate(-45deg);
}
.hamburger input:checked + svg .line-top-bottom {
  stroke-dasharray: 20 300;
  stroke-dashoffset: -32.42;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
        z-index: 100;
    }
    .site-nav .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        flex-direction: column;
        padding: 0;
        gap: 0;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
        z-index: 90;
    }
    .site-nav .nav-links.mobile-active {
        display: flex;
    }
    .site-nav .nav-links a,
    .site-nav .nav-links button {
        width: 100%;
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        text-align: center;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    .site-nav .nav-links *:last-child {
        border-bottom: none;
    }
    .site-nav .nav-links .switch {
        width: 60px;
        height: 34px;
        padding: 0;
        margin: 1.5rem auto;
    }
}

.site-footer {
    text-align: center;
    padding: 3rem 2rem;
    margin-top: 4rem;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.95rem;
    width: 100%;
}
.site-footer a {
    color: var(--blue-accent);
    text-decoration: none;
    font-weight: 600;
}
.site-footer a:hover {
    text-decoration: underline;
}

/* Main Layout */
.app-wrapper {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    flex: 1; /* allow it to grow */
    display: flex;
    align-items: stretch;
}

.main-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    transition: background-color 0.3s;
}
@media (min-width: 900px) {
    .main-card { flex-direction: row; }
}

/* LEFT COLUMN */
.left-col {
    flex: 1;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.header-text {
    text-align: center;
    font-weight: 800;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.top-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

button {
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}
.btn-outline:hover { background: var(--bg-app); }

.btn-solid {
    background: var(--primary);
    border: 1px solid var(--primary);
    color: white;
}
.btn-solid:hover { background: var(--primary-hover); }

/* Dark mode specific button tweaks */
body.dark-mode .btn-solid { color: #0f172a; }

/* Inline Cropper Area */
.cropper-wrapper {
    width: 100%;
    aspect-ratio: 1/1;
    background: var(--cropper-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    margin-bottom: 1.5rem;
}
.cropper-container {
    width: 100%;
    height: 100%;
}
.cropper-container img {
    display: block;
    max-width: 100%;
}

.circle-mask {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    box-shadow: 0 0 0 9999px var(--card-bg);
    opacity: 0.8;
    border-radius: 50%;
    z-index: 10;
}

/* Sliders */
.sliders {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}
.slider-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 700;
}
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--blue-accent);
    cursor: pointer;
}

/* Text Inputs */
.user-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}
.user-inputs input, .user-inputs textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text-main);
}
.user-inputs textarea {
    resize: vertical;
    min-height: 80px;
}
.user-inputs input:focus, .user-inputs textarea:focus {
    outline: none;
    border-color: var(--blue-accent);
}

/* RIGHT COLUMN */
.right-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.platform-tabs {
    display: grid;
    grid-template-columns: repeat(5, 48px);
    row-gap: 1.25rem;
    justify-content: space-evenly;
    border: 1px solid var(--border-color);
    padding: 1.25rem 0.5rem;
    border-radius: 12px;
}

.tab {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    cursor: pointer;
    padding: 0;
    flex: 0 0 48px;
}
.tab.active {
    border: 2px solid var(--primary);
}
.tab svg { fill: var(--primary); }

/* Mockups Viewport */
.mockups-viewport {
    flex: 1;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-app);
    position: relative;
    min-height: 600px;
}

.mockup {
    display: none;
    height: 100%;
    width: 100%;
    background: var(--card-bg);
}
.mockup.active {
    display: block;
}

.mockup-header {
    background: var(--primary);
    color: var(--bg-app);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
}
body.dark-mode .mockup-header {
    color: #0f172a;
}
.dots { letter-spacing: 2px; }

.mockup-body {
    padding: 1.5rem;
}

/* Shared Avatar */
.avatar {
    background-color: var(--bg-app);
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--border-color);
}

/* TikTok Specifics */
.tk-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.tk-stats {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.tk-stats strong { color: var(--text-main); }
.btn-follow {
    padding: 0.5rem 2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    background-color: #fe2c55;
    border-color: #fe2c55;
    color: white;
}
body.dark-mode .btn-follow { color: white; }

/* Post Grid */
.tk-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
}
.grid-box {
    aspect-ratio: 1/1;
    background: var(--bg-app);
}

/* IG Specifics */
.ig-profile {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.ig-stats {
    display: flex;
    gap: 1.5rem;
    flex: 1;
    justify-content: center;
}
.ig-stats div {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.9rem;
}

/* Layout fixes for LinkedIn and Twitter Avatars */
.li-banner {
    height: 100px;
    background: #a0b4b7;
}

.tw-banner {
    height: 100px;
    background: #1da1f2;
}

.tw-profile-header, .li-profile-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: -60px;
    padding: 0;
}

.tw-avatar, .li-avatar {
    width: 120px;
    height: 120px;
    border: 4px solid var(--card-bg);
}

.btn-li {
    background: #0a66c2;
    border-color: #0a66c2;
    border-radius: 16px;
    padding: 0.4rem 1.2rem;
    color: white;
}
body.dark-mode .btn-li { color: white; } /* override for this specific button */
.btn-li-outline {
    background: transparent;
    color: #0a66c2;
    border-color: #0a66c2;
    border-radius: 16px;
    padding: 0.4rem 1.2rem;
    margin-left: 0.5rem;
}

.btn-tw {
    border-radius: 20px;
    padding: 0.4rem 1.2rem;
    background-color: #0f1419;
    color: #ffffff;
    border-color: #0f1419;
}
body.dark-mode .btn-tw {
    background-color: #eff3f4;
    color: #0f1419;
    border-color: #eff3f4;
}

/* Color Psychology Infographic Layout */
.infographic-container {
    display: grid;
    grid-template-columns: 1fr 250px 1fr;
    gap: 1.5rem;
    align-items: center;
    width: 100%;
}

.info-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.info-card {
    padding: 1rem;
    border-radius: 4px;
    height: 100%;
}

.info-right .info-card {
    text-align: right;
}

/* Colors matching the design */
.card-green { border-left: 8px solid #22C55E; background: rgba(34, 197, 94, 0.1); }
.card-blue { border-left: 8px solid #3B82F6; background: rgba(59, 130, 246, 0.1); }
.card-purple { border-left: 8px solid #8B5CF6; background: rgba(139, 92, 246, 0.1); }
.card-black { border-left: 8px solid #000000; background: rgba(0, 0, 0, 0.1); }

.card-yellow { border-right: 8px solid #FDE047; background: rgba(253, 224, 71, 0.1); }
.card-orange { border-right: 8px solid #F97316; background: rgba(249, 115, 22, 0.1); }
.card-red { border-right: 8px solid #EF4444; background: rgba(239, 68, 68, 0.1); }
.card-gray { border-right: 8px solid #9CA3AF; background: rgba(156, 163, 175, 0.1); }

/* Center Graphic */
.info-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.ring-wrapper {
    position: relative;
    width: 250px;
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(
        #FDE047 0deg 45deg,
        #F97316 45deg 90deg,
        #EF4444 90deg 135deg,
        #9CA3AF 135deg 180deg,
        #000000 180deg 225deg,
        #8B5CF6 225deg 270deg,
        #3B82F6 270deg 315deg,
        #22C55E 315deg 360deg
    );
}

.ring-inner {
    position: absolute;
    width: 70%;
    height: 70%;
    background: var(--card-bg);
    border-radius: 50%;
    z-index: 1;
}

.gap-line {
    position: absolute;
    width: 100%;
    height: 6px;
    background: var(--card-bg);
    z-index: 2;
}

.gap-1 { transform: rotate(0deg); }
.gap-2 { transform: rotate(45deg); }
.gap-3 { transform: rotate(90deg); }
.gap-4 { transform: rotate(135deg); }

.brain-icon-wrapper {
    position: relative;
    z-index: 3;
    width: 55%;
    height: 55%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brain-svg {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

body:not(.dark-mode) .brain-svg {
    mix-blend-mode: multiply;
}

body.dark-mode .brain-svg {
    filter: invert(1);
}

/* Mobile responsive layout */
@media (max-width: 900px) {
    .infographic-container {
        grid-template-columns: 1fr;
    }
    
    .info-center {
        order: -1;
        margin: 2rem 0;
    }

    .info-right .info-card {
        text-align: left;
    }
    
    .card-yellow { border-right: none; border-left: 8px solid #FDE047; }
    .card-orange { border-right: none; border-left: 8px solid #F97316; }
    .card-red { border-right: none; border-left: 8px solid #EF4444; }
    .card-gray { border-right: none; border-left: 8px solid #9CA3AF; }
}

/* WhatsApp */
.wa-mockup {
    background: #f0f2f5;
    height: 100%;
}
body.dark-mode .wa-mockup {
    background: #111b21;
}
.wa-card {
    background: var(--card-bg);
    padding: 1.5rem;
    text-align: center;
}
.wa-section {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    margin-top: 0.5rem;
}
.wa-label {
    color: #008069;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

/* Telegram */
.tg-header {
    text-align: center;
    padding: 1.5rem;
}
.tg-section {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
}
.tg-label {
    color: var(--blue-accent);
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

/* Viber */
.vb-header {
    text-align: center;
    padding: 2rem;
}

/* Full Page Loader */
.loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-app);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loader-wrapper.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader {
  --color: #a5a5b0;
  --size: 70px;
  width: var(--size);
  height: var(--size);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

.loader span {
  width: 100%;
  height: 100%;
  background-color: var(--color);
  animation: keyframes-blink 0.6s alternate infinite linear;
}

.loader span:nth-child(1) { animation-delay: 0ms; }
.loader span:nth-child(2) { animation-delay: 200ms; }
.loader span:nth-child(3) { animation-delay: 300ms; }
.loader span:nth-child(4) { animation-delay: 400ms; }
.loader span:nth-child(5) { animation-delay: 500ms; }
.loader span:nth-child(6) { animation-delay: 600ms; }

@keyframes keyframes-blink {
  0% {
    opacity: 0.3;
    transform: scale(0.5) rotate(5deg);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Modal Styles */
.modal-wrapper {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.3s;
}
.modal-wrapper.hidden {
    opacity: 0;
    pointer-events: none;
}
.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.close-btn {
    background: transparent;
    border: none;
    font-size: 2rem;
    line-height: 1;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
}

/* Flat Mockups: Disable all button interactivity inside the mockup previews */
.mockup button {
    cursor: default !important;
    transition: none !important;
    pointer-events: none !important;
}
.close-btn:hover {
    color: var(--text-main);
}

/* 3D Download Button */
#btn-download {
    cursor: pointer;
    transition: all 0.1s ease;
    background-color: #3b82f6;
    color: #ffffff;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    border-bottom: 4px solid #2563eb;
    margin: 1.5rem auto 0 auto;
    display: block;
    width: 75%;
    font-size: 0.95rem;
    font-weight: bold;
    flex: none;
}
#btn-download:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
    border-bottom-width: 6px;
}
#btn-download:active {
    filter: brightness(0.9);
    transform: translateY(2px);
    border-bottom-width: 2px;
}