/*
  This file is part of <project name>.
  Copyright (C) 2024 Oscloud

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

/* ============================================
   IMPORTS - Inter font from Google Fonts
   ============================================ */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap");

/* ============================================
   CSS PROMĚNNÉ - OSCloud paleta
   ============================================ */
:root {
  /* Primární barvy - OSCloud modrá z loga */
  --color-primary: #1565c0;
  --color-primary-light: #1e88e5;
  --color-primary-dark: #0d47a1;
  --color-accent: #42a5f5;

  /* Pozadí - tmavě modrá */
  --color-bg: #0a1628;
  --color-bg-gradient-start: #0a1628;
  --color-bg-gradient-end: #142849;

  /* Text */
  --color-text: #e8f1ff;
  --color-text-muted: #9fb3d1;
  --color-text-dim: #6b7e9c;

  /* Skla (glassmorphism) */
  --glass-bg: rgba(30, 60, 110, 0.25);
  --glass-bg-hover: rgba(30, 100, 180, 0.35);
  --glass-border: rgba(120, 180, 255, 0.18);
  --glass-border-hover: rgba(120, 180, 255, 0.4);
  --glass-blur: 12px;

  /* Stíny */
  --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(21, 101, 192, 0.25);

  /* Misc */
  --transparent: transparent;
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
}

/* ============================================
   RESET A ZÁKLAD
   ============================================ */
* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

html {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--color-text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  line-height: 1.6;
  text-align: center;

  /* Tmavě modrý gradient pozadí */
  background: linear-gradient(135deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
  background-attachment: fixed;
  min-height: 100vh;

  /* Subtilní decorativní záře v pozadí */
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 20% 30%, rgba(21, 101, 192, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(66, 165, 245, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
menu,
nav,
section,
summary {
  display: block;
}

audio,
canvas,
progress,
video {
  display: inline-block;
  vertical-align: baseline;
}

audio:not([controls]) {
  display: none;
  height: 0;
}

[hidden],
template {
  display: none;
}

img {
  border: 0;
  max-width: 100%;
}

svg:not(:root) {
  overflow: hidden;
}

hr {
  box-sizing: content-box;
  height: 0;
  border: 0;
  border-top: 1px solid var(--glass-border);
  margin: 2rem 0;
}

/* ============================================
   ODKAZY
   ============================================ */
a {
  background-color: var(--transparent);
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:active,
a:hover {
  outline: 0;
}

a:hover {
  color: var(--color-primary-light);
  text-decoration: underline;
}

/* ============================================
   HLAVIČKA
   ============================================ */
.page-header {
  position: relative;
  z-index: 1;
  padding: 3rem 1.5rem 2rem 1.5rem;
  text-align: center;
}

.project-name {
  margin: 0.5rem 0;
  font-family: "Inter", sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
  background: linear-gradient(135deg, #ffffff 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media screen and (min-width: 64em) {
  .project-name {
    font-size: 5rem;
  }
}

@media screen and (min-width: 42em) and (max-width: 64em) {
  .project-name {
    font-size: 3.5rem;
  }
}

@media screen and (max-width: 42em) {
  .project-name {
    font-size: 2.25rem;
  }
}

.project-tagline {
  margin: 1rem auto 0 auto;
  max-width: 60ch;
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media screen and (max-width: 42em) {
  .project-tagline {
    font-size: 1rem;
    padding: 0 1rem;
  }
}

.project-description {
  margin: 1rem auto;
  max-width: 70ch;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  flex: 1;
  position: relative;
  z-index: 1;
  font-family: "Inter", sans-serif;
  max-width: 64rem;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem 1.5rem;
  word-wrap: break-word;
}

.main-content :first-child {
  margin-top: 0;
}

.main-content h1,
.main-content h2,
.main-content h3,
.main-content h4 {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.main-content h2 {
  font-size: 1.75rem;
  color: var(--color-accent);
}

.main-content h3 {
  font-size: 1.35rem;
}

.main-content p {
  margin: 0 auto 1em auto;
  max-width: 70ch;
  text-align: left;
  color: var(--color-text);
}

.main-content ul,
.main-content ol {
  max-width: 70ch;
  margin: 0 auto 1em auto;
  text-align: left;
  color: var(--color-text);
  padding-left: 1.5rem;
}

.main-content li {
  margin-bottom: 0.4em;
}

.main-content code {
  padding: 2px 6px;
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  font-size: 0.9rem;
  color: var(--color-accent);
  background-color: rgba(66, 165, 245, 0.12);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
}

.main-content blockquote {
  padding: 0.5rem 1.25rem;
  margin: 1rem auto;
  max-width: 70ch;
  text-align: left;
  color: var(--color-text-muted);
  border-left: 3px solid var(--color-primary);
  background: var(--glass-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ============================================
   TLAČÍTKA - Glassmorphism
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding: 0.75rem 1.25rem;
  color: var(--color-text);
  background-color: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  font-family: "Inter", sans-serif;
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.btn:hover {
  color: #ffffff;
  background-color: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.btn:active {
  transform: translateY(0);
}

.btn + .btn {
  margin-left: 0.5rem;
}

/* Primary button (highlighted CTA) */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-color: var(--color-primary-light);
  font-weight: 600;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
  border-color: var(--color-accent);
  color: #ffffff;
}

/* Tlačítka mobil */
@media screen and (max-width: 42em) {
  .btn {
    display: flex;
    width: 100%;
    justify-content: center;
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
  }

  .btn + .btn {
    margin-top: 0.5rem;
    margin-left: 0;
  }
}

/* ============================================
   NAV - skupina tlačítek
   ============================================ */
nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

@media screen and (max-width: 42em) {
  nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
}

/* ============================================
   SECTION TITLES (helpers pro landing)
   ============================================ */
.section-title {
  text-align: center;
  margin: 2rem 0 0.75rem 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2.5px;
  font-weight: 600;
  color: var(--color-text-dim);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 2rem 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  font-family: "Inter", sans-serif;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.site-footer p {
  text-align: center;
  margin: 0;
}

.site-footer a {
  color: var(--color-accent);
}

/* ============================================
   SPACER
   ============================================ */
.spacer {
  height: 1.5rem;
}

/* ============================================
   NEWS BLOCK (pro novinky)
   ============================================ */
.news-block {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  background-color: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  text-align: left;
  transition: all 0.25s ease;
}

.news-block:hover {
  border-color: var(--glass-border-hover);
  background-color: var(--glass-bg-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.news-block h2,
.news-block h3 {
  margin-top: 0;
  color: var(--color-accent);
}

.news-date {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(66, 165, 245, 0.1);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.news-date:hover {
  color: var(--color-text);
  background-color: rgba(66, 165, 245, 0.2);
  text-decoration: none;
}

.news-item {
  margin-bottom: 1rem;
}

/* ============================================
   FAQ (pro FAQ stránku)
   ============================================ */
.faq-item {
  margin: 1rem auto;
  padding: 1.25rem 1.5rem;
  max-width: 70ch;
  text-align: left;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.faq-item h2 {
  margin-top: 0;
  font-size: 1.2rem;
  color: var(--color-accent);
}

/* ============================================
   HOME ICON (v hlavičkách stránek)
   ============================================ */
.home-icon {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

.home-icon:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ============================================
   SCROLLBAR - hezčí pro Webkit
   ============================================ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--glass-bg-hover);
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ============================================
   SUB / SUP
   ============================================ */
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sup {
  top: -0.5em;
}

sub {
  bottom: -0.25em;
}

/* ============================================
   MOBILNÍ ÚPRAVY
   ============================================ */
@media screen and (max-width: 42em) {
  .page-header {
    padding: 2rem 1rem 1.5rem 1rem;
  }

  .main-content {
    padding: 0.5rem 1rem 1.5rem 1rem;
  }

  .home-icon {
    top: 1rem;
    right: 1rem;
  }
}