/* =========================================================================
   Suffer S&M - stylesheet
   Sections: 1 variables · 2 base · 3 header & timers · 4 notifications
             5 layout · 6 exercise cards · 7 session actions · 8 logs
             9 popups · 10 install/update · 11 fullscreen · 12 animations
   ========================================================================= */

/* ============================= 1 · Variables ============================= */
:root {
    /* Surfaces */
    --color-background: rgb(0, 0, 0);
    --color-background-header: rgb(0, 0, 0);
    --color-background-popup: rgb(255, 255, 255);
    --color-background-log-entry: rgb(220, 220, 220);
    --color-border: rgba(255, 255, 255, 0.55);

    /* Text */
    --color-text: rgb(0, 229, 255);
    --color-text-dark: rgb(0, 0, 0);
    --color-text-muted: rgb(150, 150, 165);
    --color-text-light-blue: rgb(0, 255, 225);

    /* Secondary accent - sporty electric blue for exercise-card controls */
    --color-accent: rgb(56, 189, 248);
    --color-accent-border: rgba(56, 189, 248, 0.45);
    --color-accent-fill: rgba(56, 189, 248, 0.14);

    /* Accents */
    --color-yes: rgb(200, 255, 0);
    --color-no: rgb(255, 51, 248);
    --color-pending: rgb(0, 255, 247);
    --color-completed: rgb(0, 255, 247);
    --color-partial: rgb(255, 196, 0);
    --color-danger: rgb(255, 0, 0);

    /* Radii */
    --radius-small: 8px;
    --radius-medium: 10px;
    --radius-pill: 9999px;

    /* Spacing */
    --spacing-s: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-m: 1rem;
    --spacing-l: 1.5rem;

    /* Sizing */
    --button-min-height: 2.6rem;
    --sidebar-width: 160px;
    --set-button-width: 88px;
    --container-width: min(100%, 480px);
    --popup-width: min(90%, 480px);
    --popup-width-slim: min(85%, 360px);

    /* Type scale */
    --font-size-button-small: 1.2rem;
    --font-size-button-medium: 1.4rem;
    --font-size-timer: 3.5rem;
    --font-size-rest-timer: 3.5rem;
    --font-size-resume-hint: 2rem;

    /* Header geometry */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --header-base-height: 70px;
    --header-height: calc(var(--header-base-height) + var(--safe-area-top));

    /* Layers */
    --z-header: 100;
    --z-rest-timer: 250;
    --z-overlay: 300;
    --z-popup: 400;
    --z-notification: 500;

    /* Effects */
    --gradient-exercise-border: linear-gradient(
        90deg, transparent 0%, rgb(0, 208, 255) 35%, rgb(255, 0, 200) 75%, transparent 100%
    );
    --glow-gradient: linear-gradient(
        45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000
    );
    --glow-animation-normal: 20s;
    --glow-animation-fast: 5s;
    --pulse-animation-normal: 3s;
    --pulse-animation-fast: 1s;
}

/* =============================== 2 · Base =============================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Locks the page behind an open popup. */
body.has-overlay {
    overflow: hidden;
}

/* `hidden` must win over the display values set on buttons and flex boxes. */
[hidden] {
    display: none !important;
}

button,
input,
.exercise-name {
    font-family: inherit;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--button-min-height);
    border: none;
    border-radius: var(--radius-pill);
    cursor: pointer;
    color: inherit;
    background: transparent;
}

button:focus-visible,
input:focus-visible,
.exercise-name:focus-visible {
    outline: 2px solid var(--color-text-light-blue);
    outline-offset: 2px;
}

input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* ========================= 3 · Header and timers ======================== */
#workout-header {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-header);
    background-color: var(--color-background-header);
}

.header-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: var(--spacing-s);
    padding-top: calc(var(--spacing-s) + var(--safe-area-top));
}

#workout-main-btn {
    width: 80%;
    max-width: 420px;
    font-size: var(--font-size-button-medium);
    color: var(--color-text);
    animation: colorPulse 3s infinite cubic-bezier(0.075, 0.82, 0.165, 1);
}

#workout-options {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-s);
    width: 90%;
    max-width: 420px;
}

#workout-a-btn,
#workout-b-btn {
    flex: 1;
    font-size: var(--font-size-button-medium);
    color: var(--color-text);
}

#workout-a-btn.pulse-text,
#workout-b-btn.pulse-text {
    color: var(--color-text-light-blue);
    animation: opacityPulse 1.6s infinite;
}

#workout-main-btn:active,
#workout-a-btn:active,
#workout-b-btn:active {
    animation: none;
    opacity: 0.6;
}

/* Workout timer -------------------------------------------------------- */
#workout-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    font-size: var(--font-size-timer);
    font-variant-numeric: tabular-nums;
    -webkit-font-feature-settings: "tnum";
    font-feature-settings: "tnum";
    cursor: pointer;
}

#workout-timer.paused {
    color: transparent;
}

#workout-timer.paused::after {
    content: 'TAP TO RESUME';
    position: absolute;
    left: 0;
    right: 0;
    text-align: center;
    font-size: var(--font-size-resume-hint);
    color: var(--color-text);
    animation: opacityPulse 2s infinite;
}

/* The rest timer takes over the header area while it counts down. */
#workout-header.rest-timer-active #workout-timer,
#workout-header.rest-timer-active #workout-main-btn,
#workout-header.rest-timer-active #workout-options {
    visibility: hidden;
    pointer-events: none;
}

/* Rest timer ---------------------------------------------------------- */
#rest-timer {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--safe-area-top);
    z-index: var(--z-rest-timer);
    background-color: var(--color-background);
    color: var(--color-text);
    font-size: var(--font-size-rest-timer);
    font-variant-numeric: tabular-nums;
    user-select: none;
    -webkit-user-select: none;
}

.rest-timer-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 5rem;
    cursor: text;
}

#rest-timer .reps-input {
    width: 6rem;
    height: 1.2em;
    font-size: var(--font-size-rest-timer);
    text-align: center;
    border: none;
    background: transparent;
    color: var(--color-text);
    caret-color: var(--color-text);
}

/* ========================== 4 · Notifications =========================== */
.notification {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    padding-top: var(--safe-area-top);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    z-index: var(--z-notification);
    background-color: var(--color-background);
    color: var(--color-text);
    font-size: clamp(1.1rem, 5vw, 2rem);
    font-weight: bold;
    transition: opacity 0.3s ease;
    /* Informational only: never intercept taps meant for the timer beneath. */
    pointer-events: none;
}

.notification--hide {
    opacity: 0;
}

/* ============================== 5 · Layout ============================== */
main {
    width: 100%;
    max-width: var(--container-width);
    min-height: calc(100vh - var(--header-height));
    margin-inline: auto;
    padding-top: var(--header-height);
    padding-bottom: calc(4rem + var(--safe-area-bottom));
    display: flex;
    flex-direction: column;
    gap: var(--spacing-l);
}

#exercises {
    width: 100%;
}

.exercise-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-m);
    width: 100%;
}

.copyright {
    margin-top: auto;
    padding: var(--spacing-m);
    text-align: center;
    font-size: 0.6rem;
    color: var(--color-text-muted);
}

/* ========================== 6 · Exercise cards ========================== */
.exercise-item {
    display: grid;
    gap: var(--spacing-s);
    width: 100%;
    padding: var(--spacing-s);
}

.exercise-name {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-bottom: var(--spacing-m);
    padding: var(--spacing-sm) var(--spacing-s);
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-text);
    cursor: pointer;
}

/* Gradient hairlines above and below the exercise title. */
.exercise-name::before,
.exercise-name::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background-image: var(--gradient-exercise-border);
}

.exercise-name::before { top: 0; }
.exercise-name::after { bottom: 0; }

.exercise-controls {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--spacing-s);
    align-items: start;
    width: 100%;
}

.exercise-sidebar {
    display: grid;
    gap: var(--spacing-s);
    align-content: start;
}

.exercise-sidebar button {
    width: 100%;
    max-width: var(--sidebar-width);
    font-size: var(--font-size-button-small);
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-accent);
    background-color: var(--color-background);
    border: 1px solid var(--color-accent-border);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.exercise-sidebar button:active {
    background-color: var(--color-accent-fill);
    border-color: var(--color-accent);
}

.one-rep-max-button.custom {
    border-color: var(--color-partial);
    color: var(--color-partial);
}


.sets-tracking {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-s);
}

.set-column {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-s);
    align-items: start;
}

.edit-weight-btn {
    width: 100%;
    min-width: 90px;
    height: var(--button-min-height);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-accent);
    background-color: var(--color-background);
    border: 1px solid var(--color-accent-border);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.edit-weight-btn:active {
    background-color: var(--color-accent-fill);
    border-color: var(--color-accent);
}

.set-btn {
    position: relative;
    flex-shrink: 0;
    width: var(--set-button-width);
    height: var(--button-min-height);
    font-size: 1.8rem;
    color: var(--color-accent);
    background-color: var(--color-background);
    border: 1px solid var(--color-accent-border);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.set-btn:active {
    background-color: var(--color-accent-fill);
}

/* Filled states cover the border, so the checkmark needs a dark tone for
   contrast against the bright fill instead of the accent color above. */
/* Blinks for CONFIG.SET_BLINK_MS, the window in which the set can be corrected. */
.set-btn.pending {
    color: var(--color-text-dark);
    background-color: var(--color-pending);
    border-color: var(--color-pending);
    animation: opacityPulse 1s infinite;
}

.set-btn.completed {
    color: var(--color-text-dark);
    background-color: var(--color-completed);
    border-color: var(--color-completed);
}

/* Completed, but with fewer reps than prescribed - same tick, different colour. */
.set-btn.partial {
    color: var(--color-text-dark);
    background-color: var(--color-partial);
    border-color: var(--color-partial);
}


/* Inline reps entry, rendered inside the set button. */
.set-btn .reps-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    font-size: var(--font-size-button-medium);
    border: none;
    border-radius: var(--radius-pill);
    background-color: #ffffff;
    color: var(--color-text-dark);
}

/* ========================= 7 · Session actions ========================== */
#session-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-l);
    width: 100%;
}

.button-group {
    display: flex;
    width: 80%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: var(--radius-small);
    background-color: var(--color-background);
}

/* #add-exercise-btn is currently the only button inside .button-group,
   so removing the border here removes it for that button specifically
   without affecting other buttons. */

.button-group button {
    flex: 1;
    gap: var(--spacing-s);
    padding: 12px;
    font-size: 1rem;
    color: var(--color-text);
    border-radius: 0;
    transition: background-color 0.2s ease;
}

.button-group button:active {
    background-color: rgba(255, 255, 255, 0.12);
}

.button-group svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.save-workout-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
}

/* Animated rainbow glow around the save button. */
#finish-workout-btn {
    position: relative;
    z-index: 0;
    width: 60%;
    min-height: 3rem;
    color: #ffffff;
    background: #111;
    border-radius: var(--radius-medium);
    animation: buttonPulse var(--pulse-animation-normal) infinite cubic-bezier(0.66, 0, 0, 1);
}

#finish-workout-btn::before,
#finish-workout-btn::after {
    content: '';
    position: absolute;
    z-index: -1;
    border-radius: var(--radius-pill);
}

#finish-workout-btn::before {
    top: -2px;
    left: -2px;
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    background: var(--glow-gradient);
    background-size: 400%;
    filter: blur(5px);
    animation: glowSlide var(--glow-animation-normal) linear infinite;
}

#finish-workout-btn::after {
    inset: 0;
    background: var(--color-background);
}

#finish-workout-btn.confirm {
    animation: buttonPulse var(--pulse-animation-fast) infinite cubic-bezier(0.66, 0, 0, 1);
}

#finish-workout-btn.confirm::before {
    animation: glowSlide var(--glow-animation-fast) linear infinite;
}

/* ============================== 8 · Logs ================================ */
.workout-logs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-m);
    width: 90%;
    margin-inline: auto;
    padding: var(--spacing-m);
    border-radius: var(--radius-small);
    background-color: var(--color-background);
}

.workout-logs p {
    padding: var(--spacing-m);
    text-align: center;
    font-size: 1rem;
    color: var(--color-text-muted);
}

.log-entry {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: var(--spacing-m);
    border-radius: var(--radius-small);
    background-color: var(--color-background-log-entry);
    color: var(--color-text-dark);
}

.log-entry .date {
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    line-height: 1.4;
    text-align: center;
}

.log-entry .total-volume {
    margin: var(--spacing-s) 0 var(--spacing-m);
    font-weight: bold;
}

.delete-log-btn {
    width: 10rem;
    padding: 8px 12px;
    font-size: 0.9rem;
    color: var(--color-text-dark);
    background-color: rgba(0, 0, 0, 0.08);
}

.delete-log-btn.confirm {
    color: #ffffff;
    background-color: var(--color-danger);
    font-weight: bold;
}

/* ============================= 9 · Popups =============================== */
.popup-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    background: rgba(0, 0, 0, 0.65);
    touch-action: none;
}

.popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: var(--z-popup);
    width: var(--popup-width);
    max-height: 85vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: var(--spacing-l);
    border-radius: var(--radius-medium);
    background-color: var(--color-background-popup);
    color: var(--color-text-dark);
    animation: popupIn 0.2s ease-out;
}

.popup h2 {
    margin-bottom: var(--spacing-m);
    font-size: 1.5rem;
    text-align: center;
}

.popup h3 {
    margin-bottom: var(--spacing-s);
    font-size: 1.2rem;
    text-align: center;
}

.popup p {
    margin-bottom: var(--spacing-s);
    font-size: 1.05rem;
    line-height: 1.5;
}

.popup .close-btn {
    display: block;
    min-width: 120px;
    margin: var(--spacing-m) auto 0;
    padding: 0 var(--spacing-m);
    color: #ffffff;
    background-color: var(--color-text-dark);
    border-radius: var(--radius-medium);
}

.how-to-content {
    margin-bottom: var(--spacing-m);
    line-height: 1.6;
}

.progress-popup h3 {
    margin-top: var(--spacing-m);
    text-align: left;
}

/* Weight / reps / 1RM editors ----------------------------------------- */
.weight-edit-popup {
    width: var(--popup-width-slim);
    min-width: 280px;
}

.weight-input-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-m);
    width: 100%;
    margin-bottom: var(--spacing-s);
}

.weight-input-container label {
    font-size: 1rem;
}

.weight-input-container input[type="number"] {
    width: 110px;
    height: var(--button-min-height);
    font-size: 1.2rem;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.35);
    border-radius: var(--radius-small);
    background: #ffffff;
    color: var(--color-text-dark);
}

.popup-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
    margin-top: var(--spacing-m);
}

.popup-buttons button {
    width: 100%;
    min-height: var(--button-min-height);
    font-size: 1.1rem;
    color: var(--color-text-dark);
}

.apply-all-btn {
    background-color: rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.25);
}

.apply-all-btn.active {
    background-color: var(--color-yes);
    border-color: var(--color-text-dark);
    font-weight: bold;
}

.confirm-btn {
    background-color: var(--color-yes);
    font-weight: bold;
}

.cancel-btn {
    background-color: var(--color-no);
    color: #ffffff;
}

/* 1RM override editor - its own tasteful hierarchy instead of the generic
   confirm/cancel colours: solid accent for the primary save action, a soft
   accent tint for the secondary "use calculated value" reset, and a muted
   rose tint for cancel so it reads as calm dismissal rather than an alarm. */
.one-rep-max-edit-popup .confirm-btn {
    background-color: var(--color-accent);
    color: #ffffff;
    font-weight: 600;
}

.one-rep-max-edit-popup .apply-all-btn {
    background-color: var(--color-accent-fill);
    border: 1px solid var(--color-accent-border);
    color: var(--color-text-dark);
    font-weight: 600;
}

.one-rep-max-edit-popup .cancel-btn {
    background-color: rgba(255, 51, 248, 0.12);
    border: 1px solid rgba(255, 51, 248, 0.4);
    color: var(--color-text-dark);
}

/* Add exercise picker -------------------------------------------------- */

.add-exercise-popup {
    text-align: center;
}

.add-exercise-popup .exercise-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
}

.add-exercise-popup .exercise-buttons button {
    padding: var(--spacing-s) var(--spacing-m);
    font-size: 1rem;
    color: var(--color-text-dark);
    background-color: rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(0, 0, 0, 0.2);
}

/* ======================= 10 · Install and update ======================= */
#workout-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

#installButton {
    width: 90%;
    max-width: 300px;
    min-height: 48px;
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-text-dark);
    background-color: #ffffff;
    border-radius: var(--radius-medium);
}

.install-instructions {
    max-width: 300px;
    padding: var(--spacing-m);
    text-align: center;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
}

#updateButton {
    position: absolute;
    top: calc(var(--safe-area-top) + 4px);
    right: var(--spacing-m);
    min-height: 2rem;
    padding: var(--spacing-s) var(--spacing-m);
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--color-text-dark);
    background-color: var(--color-yes);
    border-radius: var(--radius-small);
}

/* ========================== 11 · Fullscreen ============================ */
body.fullscreen-mode #workout-header,
body.fullscreen-mode #rest-timer {
    display: none;
}

body.fullscreen-mode main {
    padding-top: var(--safe-area-top);
}

/* ========================== 12 · Animations ============================ */
@keyframes opacityPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes colorPulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 208, 255, 0.4); }
    33% { box-shadow: 0 0 0 10px rgba(255, 0, 200, 0.4); }
    66% { box-shadow: 0 0 0 0 rgba(255, 247, 0, 0.4); }
    100% { box-shadow: 0 0 0 0 rgba(0, 208, 255, 0.4); }
}

@keyframes buttonPulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

@keyframes glowSlide {
    0% { background-position: 0 0; }
    50% { background-position: 400% 0; }
    100% { background-position: 0 0; }
}

@keyframes popupIn {
    from { opacity: 0; transform: translate(-50%, -48%); }
    to { opacity: 1; transform: translate(-50%, -50%); }
}

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

/* ========================== 13 · Responsive ============================ */
/* Narrow phones: let the sidebar and sets stack instead of squeezing. */
@media (max-width: 380px) {
    .exercise-controls {
        grid-template-columns: 1fr;
    }

    .exercise-sidebar {
        grid-template-columns: repeat(2, 1fr);
    }

    .exercise-sidebar button {
        max-width: none;
    }
}

@media (min-width: 481px) {
    main {
        max-width: var(--container-width);
    }
}