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

:root {
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #1a1a2e;
    --text-sub: #555;
    --accent: #242c4f;
    --accent-hover: #1a2040;
    --border: #d0d7e3;
    --input-bg: #fff;
    --hint: #8892a4;
    --footer: #9aa0b0;
}

[data-theme="dark"] {
    --bg: #0f1117;
    --card: #1a1f2e;
    --text: #e8eaf2;
    --text-sub: #a0a8bc;
    --accent: #2dd4bf;
    --accent-hover: #20a693;
    --border: #2a3045;
    --input-bg: #242a3a;
    --hint: #6b7590;
    --footer: #505870;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background 0.3s, color 0.3s;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    font-size: 18px;
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 100;
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: scale(1.08);
}

main {
    background: var(--card);
    padding: 2.5rem 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(36, 44, 79, 0.10);
    width: 100%;
    max-width: 440px;
    border: 1px solid var(--border);
    transition: background 0.3s, border-color 0.3s;
}

.logo-wrap {
    text-align: center;
    margin-bottom: 1.4rem;
}

.logo {
    width: 92%;
    max-width: 420px;
    height: auto;
    object-fit: contain;
    display: block;
    margin: 0 auto;
}

[data-theme="dark"] .logo {
    filter: brightness(0) invert(1);
    opacity: 0.9;
}
[data-theme="dark"] .logo-chico {
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

h1 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.4rem;
    line-height: 1.4;
    text-align: center;
}

p {
    color: var(--text-sub);
    font-size: 0.88rem;
    margin-bottom: 1.8rem;
    text-align: center;
}

.campo {
    margin-bottom: 1.1rem;
}

label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.4rem;
}

.hint {
    font-weight: 400;
    color: var(--hint);
    font-size: 0.78rem;
}

input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.2s, background 0.3s;
}

/* Edge (Chromium) tiene su propio "ojito" nativo para ver la clave,
   pero desaparece al perder el foco y ya no se puede volver a
   clickear -- lo tapamos y ponemos el nuestro propio, que siempre
   queda visible y clickeable (ver password-toggle.js). */
input[type="password"]::-ms-reveal,
input[type="password"]::-ms-clear {
    display: none;
}

.envoltorio-clave {
    position: relative;
}

.envoltorio-clave input {
    padding-right: 2.6rem;
}

.boton-mostrar-clave {
    position: absolute;
    right: 0.7rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.2rem;
    line-height: 1;
    color: var(--hint);
    opacity: 0.75;
}

.boton-mostrar-clave:hover {
    opacity: 1;
}

input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(36, 44, 79, 0.08);
}

[data-theme="dark"] input:focus {
    box-shadow: 0 0 0 3px rgba(79, 106, 240, 0.15);
}

button[type="submit"] {
    width: 100%;
    padding: 0.85rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    margin-top: 0.6rem;
    letter-spacing: 0.3px;
    transition: background 0.2s, transform 0.1s;
}

button[type="submit"]:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

button[type="submit"]:active {
    transform: translateY(0);
}

.footer {
    margin-top: 1.8rem;
    font-size: 0.75rem;
    color: var(--footer);
    text-align: center;
    line-height: 1.8;
    margin-bottom: 0;
}

.footer-sub {
    font-size: 0.7rem;
    opacity: 0.75;
}