/* ZÁKLADNÉ PREMENNÉ PRE DIZAJN (Minimalistický štýl) */
:root {
    --color-bg: #f9f9f9;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-border: #e0e0e0;
    --color-primary: #000000;
    --color-primary-hover: #333333;
    --color-error: #d93025;
    
    --font-main: 'Inter', sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* TYPOGRAFIA */
h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

/* NAVIGÁCIA */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.username-display {
    margin-right: var(--spacing-md);
    font-weight: 600;
}

/* HLAVNÝ KONTAJNER */
.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

/* CHYBOVÉ HLÁŠKY (Pre QA) */
.error-toast {
    position: fixed;
    top: 80px;
    right: var(--spacing-xl);
    background-color: var(--color-error);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-weight: 600;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(217, 48, 37, 0.2);
    transition: opacity 0.3s ease;
}

.hidden {
    display: none !important;
}

/* FORMULÁRE A PRIHLÁSENIE */
.auth-wrapper {
    width: 100%;
    max-width: 400px;
}

.auth-box {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.input-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    font-size: 0.875rem;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.divider {
    text-align: center;
    margin: var(--spacing-xl) 0;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background-color: var(--color-border);
}

.divider::before { left: 0; }
.divider::after { right: 0; }

/* TLAČIDLÁ */
button {
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s, color 0.2s;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background-color: var(--color-primary);
    color: white;
    font-size: 1rem;
}

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

.btn-secondary {
    width: 100%;
    padding: 12px;
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    font-size: 1rem;
}

.btn-secondary:hover {
    background-color: rgba(0,0,0,0.05);
}

.btn-outline {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.btn-outline:hover {
    border-color: var(--color-primary);
}

.btn-icon {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-muted);
}

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

/* CHAT SEKCIA */
.chat-wrapper {
    width: 100%;
    height: calc(100vh - 200px);
    display: flex;
    flex-direction: column;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.chat-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.messages-container {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    background-color: #fafafa;
}

.message-placeholder {
    text-align: center;
    color: var(--color-text-muted);
    margin-top: auto;
    margin-bottom: auto;
}

.msg {
    max-width: 80%;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background-color: white;
    border: 1px solid var(--color-border);
    position: relative;
    align-self: flex-start;
}

.msg.own {
    align-self: flex-end;
    background-color: #f0f0f0;
    border-color: #e0e0e0;
}

.msg-author {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.msg.own .msg-author {
    display: none; /* Nepotrebujeme vidieť vlastné meno na každej správe */
}

.msg-content {
    word-break: break-word;
}

.msg-time {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-align: right;
    margin-top: 4px;
}

.chat-input-area {
    display: flex;
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
    gap: var(--spacing-sm);
}

.chat-input-area input {
    flex: 1;
    margin-bottom: 0; /* Override auth style */
}

.chat-input-area button {
    width: auto;
    padding: 0 var(--spacing-xl);
}