/* ========================================
   Convertisseur de Devises — Style
   BEM méthodologie | Modern | Haut contraste
   ======================================== */

/* ----------------------------------------
   Config & Reset
   ---------------------------------------- */

:root {
    --c-bg: #f0f2f5;
    --c-bg-alt: #e2e6ec;
    --c-surface: #ffffff;
    --c-surface-hover: #f8f9fb;
    --c-accent: #0d9488;
    --c-accent-light: #14b8a6;
    --c-accent-glow: rgba(13, 148, 136, 0.12);
    --c-accent-dark: #0f766e;
    --c-text: #0f172a;
    --c-text-secondary: #475569;
    --c-text-muted: #94a3b8;
    --c-error: #dc2626;
    --c-error-bg: rgba(220, 38, 38, 0.08);
    --c-border: #cbd5e1;
    --c-border-strong: rgba(13, 148, 136, 0.35);
    --c-glass: rgba(255, 255, 255, 0.85);
    --c-glass-border: rgba(0, 0, 0, 0.06);
    --radius: 1.2rem;
    --radius-sm: 0.8rem;
    --radius-xs: 0.5rem;
    --shadow-sm: 0 0.1rem 0.2rem rgba(0, 0, 0, 0.04);
    --shadow: 0 0.1rem 0.3rem rgba(0, 0, 0, 0.04),
              0 0.4rem 1.2rem rgba(0, 0, 0, 0.05),
              0 1.2rem 2.8rem -0.8rem rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 2.4rem rgba(13, 148, 136, 0.06);
    --font: 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    font-size: 62.5%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--c-text);
    background: var(--c-bg);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--c-accent);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

a:hover {
    color: var(--c-accent-dark);
}

ul {
    list-style: none;
}

/* ----------------------------------------
   App Layout
   ---------------------------------------- */

.app {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 3.2rem 1.6rem 3.2rem;
    max-width: 44rem;
    margin: 0 auto;
}

.app__bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(180deg, rgba(13, 148, 136, 0.03) 0%, transparent 40%),
        radial-gradient(ellipse 60% 40% at 15% 85%, rgba(13, 148, 136, 0.03) 0%, transparent 60%),
        var(--c-bg);
}

/* ----------------------------------------
   Header
   ---------------------------------------- */

.app__header {
    text-align: center;
    margin-bottom: 2.8rem;
    animation: fadeInDown 0.6s var(--ease-bounce) both;
}

.app__title {
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--c-text);
    line-height: 1.2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
}

.app__title-main {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.app__title-accent {
    display: inline-block;
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: var(--c-accent);
    margin-left: 0.2rem;
}

.app__title-sub {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--c-text-muted);
}

/* ----------------------------------------
   Converter Card
   ---------------------------------------- */

.converter {
    width: 100%;
    animation: fadeInUp 0.6s 0.15s var(--ease-bounce) both;
}

.converter__card {
    background: var(--c-glass);
    backdrop-filter: blur(1.6rem);
    -webkit-backdrop-filter: blur(1.6rem);
    border: 1px solid var(--c-glass-border);
    border-radius: var(--radius);
    padding: 2.4rem 2rem;
    box-shadow: var(--shadow), var(--shadow-glow);
    position: relative;
}

/* ----------------------------------------
   Groups
   ---------------------------------------- */

.converter__row {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.6rem;
}

.converter__group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.converter__group--wide {
    margin-bottom: 1.6rem;
}

.converter__label {
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--c-text-secondary);
}

/* ----------------------------------------
   Select
   ---------------------------------------- */

.converter__select-wrap {
    position: relative;
}

.converter__select {
    width: 100%;
    padding: 1.2rem 3.6rem 1.2rem 1.2rem;
    font-family: var(--font);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--c-text);
    background: var(--c-surface);
    border: 1.5px solid var(--c-border);
    border-radius: var(--radius-xs);
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: 0.02em;
}

.converter__select:hover {
    border-color: var(--c-accent);
}

.converter__select:focus {
    outline: none;
    border-color: var(--c-accent);
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

.converter__select-arrow {
    position: absolute;
    right: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
    color: var(--c-text-muted);
    pointer-events: none;
    transition: color var(--transition);
}

.converter__select-wrap:focus-within .converter__select-arrow {
    color: var(--c-accent);
}

/* ----------------------------------------
   Swap Button
   ---------------------------------------- */

.converter__swap-wrap {
    display: flex;
    justify-content: center;
    padding: 0.4rem 0;
}

.converter__swap {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.6rem;
    height: 3.6rem;
    border-radius: 50%;
    background: var(--c-surface);
    border: 1.5px solid var(--c-border);
    color: var(--c-accent);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.converter__swap:hover {
    background: var(--c-accent);
    border-color: var(--c-accent);
    color: #ffffff;
    transform: rotate(180deg) scale(1.05);
    box-shadow: 0 0.4rem 1.2rem rgba(13, 148, 136, 0.25);
}

.converter__swap:active {
    transform: rotate(180deg) scale(0.95);
}

.converter__swap:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

/* ----------------------------------------
   Amount Input
   ---------------------------------------- */

.converter__input {
    width: 100%;
    padding: 1.2rem 1.4rem;
    font-family: var(--font-mono);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--c-text);
    background: var(--c-surface);
    border: 1.5px solid var(--c-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), box-shadow var(--transition);
    -moz-appearance: textfield;
}

.converter__input::-webkit-outer-spin-button,
.converter__input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.converter__input:hover {
    border-color: var(--c-accent);
}

.converter__input:focus {
    outline: none;
    border-color: var(--c-accent);
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

.converter__input::placeholder {
    color: var(--c-text-muted);
}

/* ----------------------------------------
   Result
   ---------------------------------------- */

.converter__result {
    text-align: center;
    padding: 2rem 1.6rem;
    background: linear-gradient(135deg, var(--c-accent-glow) 0%, transparent 60%);
    border-radius: var(--radius-sm);
    border: 1.5px solid rgba(13, 148, 136, 0.15);
    position: relative;
}

.converter__result-main {
    margin-bottom: 0.4rem;
}

.converter__result-value {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    color: var(--c-accent-dark);
    display: block;
    transition: opacity 0.2s;
    letter-spacing: -0.02em;
}

.converter__result-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
}

.converter__result-rate {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--c-text-secondary);
}

/* ----------------------------------------
   Error
   ---------------------------------------- */

.converter__error {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 1.2rem;
    margin-top: 1.2rem;
    background: var(--c-error-bg);
    border: 1px solid rgba(220, 38, 38, 0.2);
    border-radius: var(--radius-xs);
    color: var(--c-error);
    font-size: 1.3rem;
    font-weight: 600;
    animation: fadeIn 0.3s ease;
}

.converter__error svg {
    flex-shrink: 0;
}

.converter__error[hidden] {
    display: none;
}

/* ----------------------------------------
   History
   ---------------------------------------- */

.history {
    width: 100%;
    margin-top: 1.6rem;
    animation: fadeInUp 0.6s 0.3s var(--ease-bounce) both;
}

.history__toggle {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    width: 100%;
    padding: 1.2rem 1.6rem;
    background: var(--c-glass);
    backdrop-filter: blur(1rem);
    -webkit-backdrop-filter: blur(1rem);
    border: 1px solid var(--c-glass-border);
    border-radius: var(--radius);
    color: var(--c-text-secondary);
    font-family: var(--font);
    font-size: 1.3rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.history__toggle:hover {
    background: var(--c-surface);
    border-color: var(--c-border);
    color: var(--c-text);
}

.history__toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

.history__toggle-icon {
    transition: transform var(--transition);
    flex-shrink: 0;
}

.history__toggle[aria-expanded="true"] .history__toggle-icon {
    transform: rotate(90deg);
}

.history__toggle span:first-of-type {
    flex: 1;
    text-align: left;
}

.history__badge {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--c-accent-glow);
    padding: 0.2rem 0.8rem;
    border-radius: 9.9rem;
    color: var(--c-accent-dark);
    min-width: 2.4rem;
    text-align: center;
}

.history__content {
    margin-top: 0.8rem;
    background: var(--c-surface);
    backdrop-filter: blur(1rem);
    -webkit-backdrop-filter: blur(1rem);
    border: 1px solid var(--c-glass-border);
    border-radius: var(--radius);
    padding: 1.2rem;
    animation: fadeIn 0.3s ease;
}

.history__content[hidden] {
    display: none;
}

.history__list {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.history__item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1.2rem;
    background: var(--c-bg);
    border-radius: var(--radius-xs);
    border: 1px solid transparent;
    transition: border-color var(--transition);
    font-size: 1.3rem;
    gap: 1.2rem;
}

.history__item:hover {
    border-color: var(--c-border);
}

.history__item-info {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    min-width: 0;
}

.history__item-conversion {
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 1.2rem;
    color: var(--c-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history__item-date {
    font-size: 1rem;
    color: var(--c-text-muted);
}

.history__item-amount {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--c-accent-dark);
    font-size: 1.3rem;
    white-space: nowrap;
}

.history__empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--c-text-muted);
    font-size: 1.3rem;
}

/* ----------------------------------------
   Footer
   ---------------------------------------- */

.app__footer {
    margin-top: auto;
    padding: 2.4rem 0 0;
    text-align: center;
    font-size: 1.2rem;
    color: var(--c-text-muted);
    animation: fadeIn 0.6s 0.5s both;
}

.app__footer p {
    line-height: 1.6;
}

/* ----------------------------------------
   Loader
   ---------------------------------------- */

.loader {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    background: rgba(240, 242, 245, 0.92);
    backdrop-filter: blur(1.2rem);
    -webkit-backdrop-filter: blur(1.2rem);
    opacity: 1;
    transition: opacity 0.35s ease, visibility 0.35s ease;
}

.loader[hidden] {
    display: flex;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader__spinner {
    width: 3.6rem;
    height: 3.6rem;
    border: 2.5px solid var(--c-border);
    border-top-color: var(--c-accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.loader__text {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--c-text-secondary);
}

/* ----------------------------------------
   Animations
   ---------------------------------------- */

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(1.6rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-1.2rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ----------------------------------------
   Responsive
   ---------------------------------------- */

@media (min-width: 480px) {
    .app {
        padding: 4rem 2.4rem 4rem;
    }

    .app__title {
        font-size: 3.2rem;
    }

    .converter__card {
        padding: 3.2rem 2.8rem;
    }

    .converter__input {
        font-size: 2.6rem;
        padding: 1.4rem 1.6rem;
    }

    .converter__result-value {
        font-size: 3.4rem;
    }

    .converter__select {
        font-size: 1.5rem;
        padding: 1.2rem 3.6rem 1.2rem 1.4rem;
    }
}

@media (min-width: 768px) {
    .app {
        padding: 5.6rem 2.4rem 4.8rem;
        max-width: 48rem;
    }

    .app__title {
        font-size: 3.6rem;
    }

    .converter__card {
        padding: 4rem 3.2rem;
        border-radius: 1.6rem;
    }

    .converter__input {
        font-size: 2.8rem;
        padding: 1.6rem 1.8rem;
    }

    .converter__result {
        padding: 2.4rem;
    }

    .converter__result-value {
        font-size: 3.8rem;
    }
}

/* ----------------------------------------
   Reduced motion
   ---------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .converter__swap:hover {
        transform: none;
    }
}