/* Python Cloud IDE – Global styles (Phase 1)
   Strict black / white / gray developer aesthetic */

:root {
    --bg-0: #000000;
    --bg-1: #050505;
    --bg-2: #0A0A0A;
    --bg-3: #111111;
    --bg-4: #1A1A1A;
    --text: #FFFFFF;
    --text-muted: #B0B0B0;
    --text-dim: #666666;
    --border: #1A1A1A;
    --border-light: #2A2A2A;
    --accent: #FFFFFF;
    --danger: #FF5555;
    --success: #55FF55;
    --warning: #FFAA00;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg-0);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: var(--text);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

button,
input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-light);
    background: var(--bg-3);
    color: var(--text);
    cursor: pointer;
    border-radius: 2px;
    transition: background 0.1s, border-color 0.1s;
    white-space: nowrap;
    user-select: none;
}

.btn:hover {
    background: var(--bg-4);
    border-color: #3A3A3A;
}

.btn:active {
    background: var(--bg-2);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--text);
    color: var(--bg-0);
    border-color: var(--text);
}

.btn-primary:hover {
    background: #E0E0E0;
    border-color: #E0E0E0;
}

.btn-danger {
    border-color: var(--danger);
    color: var(--danger);
}

.btn-danger:hover {
    background: #1A0000;
}

.btn-sm {
    padding: 0.3rem 0.7rem;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.form-input {
    width: 100%;
    padding: 0.55rem 0.75rem;
    background: var(--bg-2);
    border: 1px solid var(--border-light);
    color: var(--text);
    border-radius: 2px;
    outline: none;
    transition: border-color 0.1s;
}

.form-input:focus {
    border-color: #555555;
}

.form-input::placeholder {
    color: var(--text-dim);
}

.form-error {
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: 0.3rem;
}

/* Layout helpers */
.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

/* Header / Nav */
.app-header {
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
}

.app-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
    color: var(--text);
}

.logo span {
    color: var(--text-dim);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Cards */
.card {
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: 1.5rem;
}

/* Toast / messages */
.alert {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-light);
    border-radius: 2px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    border-color: #552222;
    background: #110000;
    color: var(--danger);
}

.alert-success {
    border-color: #225522;
    background: #001100;
    color: var(--success);
}

.alert-info {
    border-color: var(--border-light);
    background: var(--bg-3);
    color: var(--text-muted);
}

/* Utility */
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }
.hidden { display: none !important; }

/* Focus visible for accessibility */
:focus-visible {
    outline: 1px solid #888888;
    outline-offset: 2px;
}